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secondary spicules
(PORIFERA) Microscleres distributed throughout the mesenchyme.
secondary teeth
(BRACHIOPODA) In Stropheodontidae, two projections from the ventral process that fit into sockets of the brachial valve.
secretion
n. [L. secretio, separation] A substance or fluid produced in the body by a cell or gland; the passage of this substance to the outside of the cell or gland; secretory adj..
secretory granules
(NEMATA) Proteinaceous granules produced in the salivary (esophageal) glands, then transported anteriorly to the gland ampullae where breakdown occurs; thought to release ...
section
n. [L. sectare, to cut] 1. Pertaining to a subdivision of a taxon or a series of related elements in one portion of a higher taxon. 2. A thin slice of an organism or part ...
sectorial cross vein
(ARTHROPODA: Insecta) A cross vein between the two branches of the radial sector.
secund
adj. [L. secundus, following] Having parts or organs on one side only; pointed one way; unilateral.
secundibracts
n. [L. secundus, following; brachium, arm] (ECHINODERMATA: Crinoidea) Brachials between the first and 2nd axillaries; dicostalia.
securiform
adj. [L. securis, ax; forma, shape] Hatchet-shaped.
sedentary
adj. [L. sedere, to sit] Remaining in one place; stationary.
seductor gubernaculi
see gubernaculum.
seed
n. [A.S. saed, seed] (MOLLUSCA: Bivalvia) A young oyster; not designated by a specific size range.
seed galls
(NEMATA) Seedheads converted to galls containing cryptobiotic nematode larvae or adults.
segment
n. [L. segmentum, piece] 1. A part or subdivision of a body or appendage that is marked off or separate between joints or articulations. 2. (ANNELIDA) A portion of the body, ...
segmental blood vessel
(ANNELIDA) A blood vessel in the body wall, connecting anteriorly from dorsal to ventral arteries, and posteriorly by plexes around the gut.
segmental spines
(ARTHROPODA: Insecta) In Diptera, 12 major bristles occurring in transverse rows on each segment of syrphid fly larvae.
segmentation
n. [L. segmentum, piece] 1. The division of a jointed appendage or limb. 2. Cleavage.
segmentation cavity
see blastocoel.
segmentation nucleus
Nucleus formed by union of male and female pronuclei during fertilization.
segregate
n. [L. segregare, to separate] An individual that differs in some genetic characters from the parental stock due to segregation of genes.
segregation
n. [L. segregare, to separate] 1. The act of placing apart; separation. 2. The separation of the two genes of an allelomorphic pair during meiosis.
seizing jaws
see grasping spines.
sejugal
adj. [L. se, apart; jugare, to join] Indicating the furrow or interval separating divisions or segments of an invertebrate body.
selection
see natural selection.
selection pressure
The effect of the environment in selecting individuals best suited for survival and reproduction; see natural selection.
selenaster
n. [Gr. selene, moon; aster, star] (PORIFERA) A microsclere similar to a stellaster, but based on a spiraster.
seleniform
adj. [Gr. selene, moon; L. forma, shape] In the shape of a full moon.
seleniform cell
see plasmatocytes.
selenizone
n. [Gr. selene, moon; zone, girdle] (MOLLUSCA: Gastropoda) In dibranchiates, a spiral band of crescentric growth lines or threads (lunulae) on the shell surface due to the ...
self-cleansing
(MOLLUSCA: Bivalvia) Removal and ejection of pseudofeces.
self-fertilization
The union of gametes derived from the same individual; autogamy; automixis; see cross-fertilization.
self-sedimentation
(MOLLUSCA: Bivalvia) In oysters, pseudofeces and feces that are ejected.
selfing
see self-fertilization.
sellate
adj. [L. sella, saddle] Saddle-shaped.
seller groove
(ARTHROPODA: Crustacea) In Decapoda, a short transverse groove on the carapace, dorsally anterior to the cervical groove of Nephropidae.
selva
n. [L. silva, wood] A tropical rain forest.
selvage
n. [A.S. self; edge, its own proper edge] (ARTHROPODA: Crustacea) In Ostracoda, the principal ridge of the contact margin sealing the valves closed.
sematic
adj. [Gr. sema, sign] Functioning as a warning of danger, as signalling colors of insects, or disagreeable odors of certain poisonous or dangerous animals; see allosematic, ...
sematophore
see spermatophore
semelparity
n. [L. semel, once; parere, to bear] Producing young only once in a lifetime; semelparous adj..
semiaquatic
adj. [L. semis, half; aqua, water] Living in wet places, or partially in water.
semidominant
see codominant.
semifenestra
adj. [L. semis, half; fenestra, window] (NEMATODA: Secernentea) In Heterodera one of a pair of openings in the vulval cone separating the vulval bridge; see ...
semigeographic speciation
see parapatric speciation.
semilunar
adj. [L. semi, half; luna, moon] A half-moon shaped marking with sharp ends.
seminal
adj. [L. semen, seed] Pertaining to structures in which sperm are involved.
seminal bursa
(PLATYHELMINTHES: Turbellaria) A term used to describe the sac for receiving sperm during copulation that will be stored for a period of time; bursa seminalis; see bursa ...
seminal canal
(ARTHROPODA: Insecta) In female Coleoptera, a duct or canal that connects the spermatheca with the vagina, functioning in sperm transport.
seminal ducts
see vas deferens.
seminal funnel
(ANNELIDA: Oligochaeta) The internal opening of the vas deferens.
seminal furrows
См. seminal grooves.
seminal grooves
(ANNELIDA) Referring to distinct markings in the epidermis associated with male, or prostatic pores, through which sperm and/or prostatic secretions move at the time of ...
seminal receptacle
Diverticulum of oviduct or pouch external to the oviduct for storing spermatozoa delivered by the male; receptaculum seminalis; see spermatheca, bursa copulatrix, ...
seminal vesicle
1. A male sac-, tube- or pouch-like structure in which spermatozoa is stored before being discharged; seminal reservoir; vesicula seminalis. 2. (ANNELIDA) A pouch usually ...
semination
n. [L. semen, seed] Discharge of sperm; see insemination.
semiochemical
n. [Gr. semeion, mark or signal; chemeia, transmutation] Chemicals involved in the chemical interactions between individual organisms, subdivided into two major groups, ...
semipupa
n. [L. semis, half; pupa, puppet] (ARTHROPODA: Insecta) In hypermetamorphosis, the interpolated stage between the active larva and the true pupa; the stage preceding ...
semisocial
adj. [L. semis, half; scocius, ally] (ARTHROPODA: Insecta) In Hymenoptera, female bees of the same generation living in a colony with some individuals being primarily egg ...
Semper's cells
see cells of Semper.
Semper's larva
(CNIDARIA: Anthozoa) In Zoantharia, pelagic larva with long cilia.
Semper's rib
(ARTHROPODA: Insecta) In Lepidoptera, a degenerate trachea present in the wing, alongside a functioning trachea within the vein cavity.
senescence
n. [L. senescere, to grow old] The gradual deterioration of function in an organism leading to an increased probability of death; the ageing process.
senility
n. [L. senex, old] Old age.
senior homonym
The earliest published of two or more identical names for the same or different taxa; see homonym, junior homonym.
senior synonym
The earliest published of two or more available names for the same taxon; see synonym, junior synonym.
sense club
see rhopalium.
sense cone
См. sense peg.
sense organ
A simple or multicellular receptor organ, comprised of at least one sensory cell and accessory structures.
sense peg
(ARTHROPODA: Insecta) 1. A minute cone or peg, sensory in function. 2. Sense cone of Hayes, see nesium.
sensilla
n.; pl. -ae [L. sensus, sense] see sensillum.
sensilla candelari
(ARTHROPODA: Insecta) In the fulgorid Pyrops folded sensory plaque organs having numerous bipolar neurons arranged in groups; may have evolved from a cluster of basiconic ...
sensilla circumfila
(ARTHROPODA: Insecta) Thin-walled chemoreceptors with pores on fine surface ridges of elaborately looped sensilla on the antennae of cecidomyids.
sensilla pouch
(NEMATA) An expansion of the amphidial tube, containing the sensory elements of the sensilla situated posterior to the amphidial pouch; fusus amphidialis.
sensillium
see sensillum.
sensillum
n.; pl. -la [L. sensus, sense] 1. A receptor complex composed of a sense cell or units of sense cells plus associated structures: innervated hair, flat sensory plate, or ...
sensillum ampullaceum
A sense organ in which the sense cone is a flask- or pouch-shaped cavity with no external structure evident; ampullaceous sensillum; sensory flasks.
sensillum auriforme
(ARTHROPODA: Chelicerata) In Acari, a sense organ with flattened disks, similar to sensillum campaniformium.
sensillum basiconicum
A sense organ with an external process in the form of a minute cone or peg; basiconic sensillum.
sensillum campaniformium
A thin, flexible, dome-shaped sense organ that has no pore or opening, sometimes occurring in groups, that respond to strains on the cuticle, as opposed to individual muscle ...
sensillum chaeticum
A sense organ with an external process in the form of a spine- or bristle-like seta, tactile in function.
sensillum coeloconicum
A sense organ with an external process in the form of a thin-walled conical or peg-like projection in a shallow pit below the surface of the body wall; coeloconic sensillum; ...
sensillum coelosphaericum
(ARTHROPODA: Insecta) Olfactory receptor, lacking pore tubules, found on the last antennal segment of Nicrophorus, composed of a complicated network of filaments.
sensillum coleum
A sense organ that is completely covered with a sheath except for the internal canal.
sensillum insiticum
A sense organ that shows no evidence of an external structure or pore, but the ciliary process or modified cilia are embedded in the cuticle.
sensillum opticum
A light perceiving sense organ; an ommatidium of a compound eye.
sensillum placodeum
A sense organ in the form of a flat, plate-like external membranous cover over an enlarged pore tubule, with the outer surface continuous with the general surface; maybe ...
sensillum rhinarium
see rhinarium.
sensillum scolopophorum
see scolopidium.
sensillum squamiformium
(ARTHROPODA: Insecta) A sense organ with a scale-like external appearance with nerve fiber endings at its base; usually occurring on the wing veins and abdomen; sensory ...
sensillum styloconicum
A sense organ having a terminal sensory cone, usually in a pit in the cuticle, innervated by nerve fibers running to its tip; thought to be olfactory in function; ...
sensillum trichodeum
A sense organ bearing an elongate seta, articulated with the body wall by a membranous socket so that it is free to move; a mechanoreceptor or less often as a ...
sensitization
n. [L. sensus, sense] The process or state of sensitiveness or hypersusceptibility to specific substances in contact with the body tissues.
sensorium
n.; pl. -riums, -ria [L. sensus, sense] The sensory apparatus, comprising sense organs and their nerve centers.
sensory
adj. [L. sensus, sense] Having communication with the sensorium.
sensory cell
A unicellular receptor.
sensory cell type I
Bipolar nerve cells in or beneath the epidermis of the body wall, or the epithelium of the ectodermal parts of the alimentary canal and their distal processes are ...
sensory cell type II
Bipolar or multipolar sense cell in the inner surface of the body and on the wall of the alimentary canal, their distal processes go to the epidermis, connective tissue, ...
sensory neuron
A neuron that acts as a receptor or receives excitation directly from a receptor that is not a neuron; an axonic connection usually to the central nervous system.
sensu lato
L. In a broad sense; S.L.
sensu proprio
L. In the original sense; S.Pr.
sensu stricto
L. In the strict sense; a limited sense; S.S.
senti
n. pl.; sing. sentus [L. sentire, to feel] (ARTHROPODA: Insecta) In Hemiptera, unbranched, cone-like projections of the body wall with a few short, stout setae on the trunk ...
septa
pl. septum.
septal
adj. [L. septum, partition] Pertaining to a septum.
septal filaments
(CNIDARIA: Anthozoa) Thread-like processes arranged along the free edges of the septa that contain gland cells and nematocysts.
septal plate
(BRACHIOPODA) When present, one of two plates that fuse forming the duplex median septa in the brachial valve and bearing the outer plate on their ventral surface.
septalial plates
(BRACHIOPODA) Crural plates forming the floor of the septalium and joining with the earlier-formed part of the median septum.
septalium
n. [L. septum, partition] (BRACHIOPODA) Troughlike structure of the brachial valve between hinge plates, consisting of septial plates enveloping and supported by the ...
septasternum
see pleurosternum.
septate
adj. [L. septum, partition] Partitioned off into septa.
septiform
adj. [L. septum, partition; forma, shape] Having the shape of an enclosure or septum.
septula
1. pl. septulum. 2. n.; pl. -ae [L. dim. septum, partition] (ARTHROPODA: Insecta) In Scarabaeoidea larvae, a narrow bare region of the raster: between a transverse ...
septulum
n.; pl. -tula [L. dim. septum, partition] 1. A small septum. 2. (BRYOZOA) An internal membrane of a communication organ; see dietella.
septum
n.; pl. -ta [L. septum, partition] 1. Any dividing wall, membrane or partition separating cavities or masses of tissue; a dissepiment. 2. (ANNELIDA) Two layers of ...
sere
n. [L. serere, to join] A chain of communities that follow one another in sequence, prisere (primary sere) to a climax typical of a particular climate and geographical area; ...
serial
adj. [L. series, a row of things] Pertaining to or consisting of or arranged in a series or row.
serial crochets
(ARTHROPODA: Insecta) Crochets of larvae, the distribution of the bases or points of attachment; see uniserial circle, biserial crochets, multiserial crochets.
sericate
adj. [L. sericus, silken] Having short, thick, silky down; sericeous.
sericin
n. [L. sericus, silken] (ARTHROPODA: Insecta) In Lepidoptera, a protein containing a high content of the amino acid serine, that hardens in air to form the glue surrounding ...
sericose
n. [L. sericus, silken; os, mouth] (ARTHROPODA: Insecta) In Hymenoptera, the opening for the duct of the silk glands.
sericterium
n.; pl. -teria, -teries [L. sericus, silken] (ARTHROPODA: Insecta) The spinning gland or glands. a. In ant larvae, used as shuttles in weaving nests. b. The silk-producing ...
serictery
См. sericterium.
series
n. [L. series, succession] In taxonomy, the sample taken in the field by the collector, or the sample available for taxonomic study; see hypodigm.
serific glands
(ARTHROPODA: Insecta) Glands of silk production that secrete a viscous fluid that solidifies passing through the orifice of the spinneret, emerging as two semi-crystalline ...
serology
n. [L. serum, whey; Gr. logos, discourse] The study of sera and the nature, and interactions of antigens and antibodies.
serosa
n. [L. serum, whey] (ARTHROPODA: Insecta) The outer embryonic envelope.
serosal cuticle
(ARTHROPODA: Insecta) An embryonic covering incorporating the vitelline membrane on the outside, and consisting of a chitinous endocuticle (white cuticle), with an ...
serotinal
adj. [L. serus, late] Appearing later in the season than is customary with related species.
serous
adj. [L. serum, whey] Secreting a watery, colorless serum.
serpentinous
adj. [OF. serpentine, greenish mineral] A dirty, dark green.
serra
n. [L. serra, saw] A saw-like structure.
serrate
adj. [L. serra, saw] Marginal teeth or notches like a saw.
serration
n. [L. serra, saw] A saw-like formation.
serratulate
adj. [L. serrula, small saw] Having little teeth or serrations.
serriform
adj. [L. serra, saw; forma, shape] Saw-toothed; having the form of a series of notches.
serrula
n. [L. dim. serra, saw] (ARTHROPODA: Chelicerata) In spiders, a serration on the lateral margin of each maxillary lobe for cutting into prey.
serrulate
adj. [L. dim. serra, saw] Finely serrate; having small fine teeth or minute notches.
serum
; pl. -a n. [L. serum, whey] The liquid part of the blood; the secretion of a serous membrane.
sesquiocellus
n. [L. sesqui-, one and one half; dim. oculus, eye] A large ocellate spot including a smaller one.
sessile
n. [L. sedere, to sit] Incapable of movement from place to place; attached directly, without a stem or petiole; permanently attached.
sessoblast
n. [L. sedere, to sit; Gr. blastos, bud] (BRYOZOA: Phylactolaemata) A statobast cemented to the substrate.
seston
n. [Gr. sesis, sifting] Microplankton; all organisms living or dead, swimming or floating in aquatic habitats; see nekton, neuston, plankton.
seta
n.; pl. setae [L. seta, bristle] 1. A bristle, hair or filament process of the cuticle with which it articulates or through which it protrudes; see poison seta, penial ...
setaceous
adj. [L. seta, bristle] Bristlelike, slender.
setal membrane
The membranous floor of a hair socket.
setal sac
(ANNELIDA: Polychaeta) A pocket of the parapodial rami containing a single cell at the base, that continually produce new setae as the old are lost.
setate
adj. [L. seta, bristle] Provided with bristles.
setiferous
adj. [L. seta, bristle; ferre, to carry] Bearing setae or bristles; setigerous; chaetiferous.
setiform
adj. [L. seta, bristle; forma, shape] Having the shape of a bristle or seta.
setigenous
adj. [L. seta, bristle; Gr. genitus, to produce] Giving rise to setae.
setiger
n. [L. seta, bristle; gerere, to bear] (ANNELIDA: Polychaeta) A segment carrying setae.
setigeris
n. [L. seta, bristle; gerere, to bear] (ARTHROPODA: Insecta) A structure on the protibia similar in form and use as the strigil or scraper; the tibial comb.
setigerous
adj. [L. seta, bristle; gerere, to bear] Bearing setae; setiferous.
setigerous lobe
(ANNELIDA: Polychaeta) The lobe of the parapodium that bears the setae.
setigerous tubercles
(ARTHROPODA: Insecta) In Diptera, bumps occurring on the scutellum or legs, each bearing a spine or bristle at the apex.
setireme
n. [L. seta, bristle; remus, oar] (ARTHROPODA: Insecta) In aquatic forms, the hairy, oar-like leg.
setula
n.; pl. -lae; setule n.; pl. setules [L. dim. seta, bristle] (ARTHROPODA) Slender hair- or bristle- or thread-like, fragile setae.
setulose
adj. [L. dim. seta, bristle; -osus, full of] Set with short, blunt bristles.
sex
n. [L. sexus, sex] The physical characteristics by which an animal is classed as male or female.
sex cell
see gametes.
sex chromosome
A special chromosome, not occurring in identical number or structure in the two sexes, usually determines sex; the X and Y chromosomes; see chromosome, autosome.
sex hormone
A hormone that influences primary and secondary sexual characters and sexual behavior.
sex mosaic
Intersex; gynandromorph.
sex ratio
The percentage of males and females of a specified age distribution in a population.
sex reversal
To change from one sex to the other, either by natural phenomena, pathology, or artificial means.
sex-limited character
A character occurring in only one sex; see secondary sexual characters, sex-linked character.
sex-linked character
A character controlled by a gene located in a sex chromosome; see sex chromosome.
sex-linked genes
Genes in the sex chromosomes, linked in heredity to the genes determining sex.
sexprostatic
adj. [L. sex, six; Gr. pro-, before; stare, stand] (ANNELIDA) Having 6 prostates in 3 consecutive segments.
sexradiate
adj. [L. sex, six; radius, ray] Having 6 radii; hexactinal.
sexthecal
adj. [L. sex, six; Gr. theke, case] (ANNELIDA) Having 3 pairs of spermathecae.
sexual cell
see gametes.
sexual congress
The association of males and females for sexually reproductive purposes.
sexual dimorphism
The notable phenotypic difference between sexes of the same species; see polymorphism.
sexual hybrid
A hybrid in which the DNA is recombined by the fusion of haploid nuclei of different mating types.
sexual pore
see gonopore.
sexual reproduction
Reproduction involving the fusion of two cells (gamete nuclei), resulting from meiosis.
sexual zooid
(BRYOZOA) a. In Gymnolaemata, autozooid in which sex cells develop, may or may not show skeletal modification. b. In Cheilostomata, it may loose the feeding ability.
sexuales
n. pl. [L. sexus, sex] (ARTHROPODA: Insecta) In the life-cycle of aphids and adelgids, apterous forms produced on the primary host; the eggs the females lay hatch in the ...
sexupara
n.; pl. -ae [L. sexus, sex; parere, to bear] 1. Production of male and female offspring by parthenogenesis then available for sexual reproduction. 2. (ARTHROPODA: ...
shaft
n. [A.S. sceaft, shaft] The cylindrical part of a limb or structure.
shagreened
adj. [Turk. saghri, crupper] Having numerous tooth-like projections.
sheath
n. [A.S. sceth, shell or pod] A covering enclosing an organism, part or organ.
sheath gland
(ARTHROPODA: Insecta) In Hymenoptera, a gland in the sting sheath valves of various bees, in the form of a high palisade gland epithelium beneath a strongly sclerotized ...
sheath laminae
(BRYOZOA: Stenolaemata) A concentrically enclosed stylet core, continuous with zoarial sheaths, but normally at right angles to them.
sheath of penis
see ligula.
shell
n. [A.S. scell, shell] A hard, rigid, calcareous or chitinous structure covering an animal or part of an animal.
shell fold
1. (ARTHROPODA: Crustacea) The part of the carapace behind the cephalon. 2. (MOLLUSCA: Bivalvia) The outer fold of the mantle edge that houses the periostracal glands at ...
shell gland
1. (ARTHROPODA: Crustacea) see maxillary gland. 2. (MOLLUSCA) Specialized epithelium that secretes the shell mantle. 3. (PLATYHELMINTHES: Trematoda) Mehlis\' gland.
shield
n. [A.S. scyld, shield] 1. A dorsal cover; carapace; scutellum; scutum; clypeus. 2. (ARTHROPODA: Crustacea) In Decapoda, the anterior part of the cephalothorax of ...
shoulder
adj. [A.S. sculdor, shoulder] 1. Any obtuse angulation. 2. (MOLLUSCA: Gastropoda) The angulation of the shell whorls, forming the abaxial edge of the sutural ramp or ...
shovel
n. [A.S. scofl, shovel] (ARTHROPODA: Insecta) In Ephemeroptera, the expanded, flattened leg joints.
sibling species
True species populations that are reproductively isolated, but morphologically identical or nearly so; cryptic species.
side
n. [A.S. side, side] (MOLLUSCA: Gastropoda) The surface of a shell, when present, between the shoulder and abapical suture or margin of the base.
Siebold's organ
see crista acoustica.
sieve area
(PORIFERA) The area containing inhalant apertures.
sieve plate
1. (ECHINODERMATA) see madreporite. 2. (PORIFERA) A plate-like porous structure below the osculum.
sieve tracheae
(ARTHROPODA: Chelicerata) In Ricinulei, bundles of tracheae that arise from a tubule of an ectodermal invagination on the 8th somite; see tube tracheae.
sigillum
n.; pl. sigilla (ARTHROPODA: Chelicerata) 1. In some spiders, the impressed, suboval, clear areas on the sternum. 2. In Acari, the external mark of a muscle insertion. ...
sigma
n. [Gr. the 16th letter, sigma] 1. (ARTHROPODA: Insecta) See furca. 2. (PORIFERA) A C-shaped diactinal microsclere.
sigmaspires
n. pl. [Gr. the 16th letter, sigma; speira, twist] (PORIFERA) Diactinal microsclere sigmas that are spirally twisted.
sigmoid
adj. [Gr. the 16th letter, sigma; eidos, form] Shaped like the letter S; sigmoidal.
sigmoid curve
see logistic curve.
signa
n. pl.; sing. signum [L. signum, sign] (ARTHROPODA: Insecta) In female Lepidoptera, spines or dentate or roughened patches on the inner wall of the corpus bursae, thought to ...
silicalemma
n. [L. silex, flint; Gr. lemma, peel] (PORIFERA) A unit membrane enclosing the axial filament of a siliceous spicule.
siliceous
См. silicious.
silicious
adj. [L. silex, flint] Of or pertaining to silica.
silicoblasts
n. pl. [L. silex, flint; Gr. blastos, bud] (PORIFERA) A cell that secretes all or part of a siliceous spicule.
siliquiform
adj. [L. siliqua, a pod; forma, shape] Having the shape of a silique; long, tubular and narrow like a pod.
silk
n. [Gr. serikos, silk] 1. A secretion that hardens so rapidly on extrusion that it may be produced as a long continuous thread. 2. (ARTHROPODA: Chelicerata) Secreted by ...
silk glands
Glands that secrete the liquids that produce silk on exposure to the air.
silk press
(ARTHROPODA: Insecta) In Lepidoptera larvae, a structure similar to a typical salivary pump in which the silk is molded to a thread; silk regulator; thread press.
silvan
adj. [L. sylva, silva, forest] Pertaining to or inhabiting the forests or woodland areas.
silvatic
adj. [L. sylva, silva, forest] In disease ecology, a parasite existing normally in the wild and not in the human environment; see synanthropism.
silvicolous
adj. [L. silva, forest; colere, to dwell] Inhabiting or growing in forests or woodlands.
simple
adj. [L. simplex, simple] Without embellishment; not modified, forked, toothed, branched or divided.
simple eyes
(ARTHROPODA: Insecta) The ocelli.
simple seta
see unjointed seta.
simple skeletal wall
(BRYOZOA: Stenolaemata) Having the wall calcified only on edges and one side.
simple velum
(ARTHROPODA: Crustacea) In Ostracoda, a velate structure of flange- or ridgelike form.
simple-walled colony
see fixed-walled colony.
sinciput
n. [L. semi-, half; caput, head] 1. Upper or forepart of the head. 2. (ARTHROPODA: Insecta) The head area between the vertex and clypeus, especially in Coleoptera.
single band of crochets
see mesoseries.
single-walled colony
see fixed-walled colony.
sinistral
adj. [L. sinistra, left] Pertaining to the left; to the left of the median line.
sinistral gastropods
(MOLLUSCA) Having the genitalia on the left side of the head-foot mass or pallial cavity, and commonly the shell, when viewed with the apex uppermost, with the aperture on ...
sinistron
n. [L. sinistra, left] The left side of the body.
sinistrorse
adj. [L. sinistra, left; vertere, to turn] An organism spirally twisting to the left; see dextrorse.
sinuate
adj. [L. sinus, curve] Wavy; tortuous; curving in and out.
sinuatolobate
adj. [L. sinus, curve; Gr. lobos, lobe] Sinuate and lobed.
sinuosity
adj. [L. sinus, curve] Series of curves or bends.
sinupalliate
adj. [L. sinus, curve; pallium, mantle] (MOLLUSCA: Bivalvia) Having a pallial sinus or recess in the posterior part of the pallial impression due to the retraction of the ...
sinus
n. [L. sinus, curve] A depression; bend; embayment.
sinus gland
(ARTHROPODA: Crustacea) Storage release site for neurosecretory material synthesized within the cell bodies containing hormones produced by x-organ and other sites of the ...
siphon
n. [Gr. siphon, tube] Any tubular or siphon-like structure; siphonal adj..
siphonal area
(MOLLUSCA: Bivalvia) The posterior sector of the shell surface, usually demarcated anteriorly by the umbonal ridge; secreted at the openings in the mantle edge or elevated ...
siphonal canal
(MOLLUSCA: Gastropoda) A tubular or troughlike extension of the aperture for the enclosure of the siphon.
siphonal fasciole
(MOLLUSCA: Gastropoda) The curved growth lines near the foot of the columella marking successive positions of the siphonal notch.
siphonal fold
(MOLLUSCA: Gastropoda) A ridge corresponding to the siphonal notch that winds spirally around the columella.
siphonal notch
(MOLLUSCA: Gastropoda) A narrow sinus of the apertural margin near the base of the columella functioning for protrusion of the inhalant siphon.
siphonal retractor muscles
(MOLLUSCA: Bivalvia) Muscles that retract siphons into the shell.
siphonal tube
(MOLLUSCA: Bivalvia) A tube composed of agglutinized particles derived from boring and fused to the siphonoplax; see chimney.
siphonoglyph
n. [Gr. siphon, tube; glyphein, to engrave] (CNIDARIA: Anthozoa) A special groove or canal from the mouth to the actinopharynx, functioning to circulate fluid through the ...
siphonoplax
n. [Gr. siphon, tube; plax, plate] (MOLLUSCA: Bivalvia) A chitinous or calcareous structure secreted by the mantle diverging or fused to form a tube on the posterior ...
siphonostomatous
adj. [Gr. siphon, tube; stoma, mouth] (MOLLUSCA: Gastropoda) Having the apertural margin notched or formed with a canal for the protrusion of the siphon.
siphonozooid
n. [Gr. siphon, tube; zoon, animal; eidos, form] (CNIDARIA: Anthozoa) A small, modified polyp with reduced or lacking tentacles, having a well developed siphonoglyph to ...
siphons
see gastrozooid.
siphuncle
n. [Gr. dim. siphon, tube] 1. (ARTHROPODA: Insecta) see cornicle. 2. (MOLLUSCA: Cephalopoda) A tubular vascular extension borne at the apex of the visceral hump, that ...
Siphuncula
См. sipunculids.
sipunculans
См. sipunculids.
sipunculids
n.; n.pls. [Gr. dim. siphon, tube] A phylum of bilaterally, unsegmented, cylindrical, deposit-feeding, benthic marine worms, with tentacles and mouth located at the ...
sistentes
n. [L. sistere, to stop] (ARTHROPODA: Insecta) The first generation of apterous exules on the secondary host that give rise to the alate sexuparae and apterous ...
sitophore sclerite
see esophageal sclerite.
sitopore
n. [Gr. sitos, food; poros, pore] (ARTHROPODA: Insecta) The basal part of the cibarial floor of the hypopharynx of generalized chewing insects.
situs
n. [L. situs, place] The locality; site; situation; relative position.
skeletal duplicature
(ARTHROPODA: Crustacea) In some Cephalocarida, the outer chitinous body covering that is shed during ecdysis.
skeleton
n. [Gr. skeletos, dried, body] A hardened frame work of an organism functioning for support and protection of softer parts; may be external or internal and solid or jointed; ...
skin
n. [ON. skinn, skin] The cuticle; the covering.
skin bodies
(SIPUNCULA) A group of glandular cells often present on the surface of the trunk.
skin gill
see papula.
skin rings
see annular.
skototaxis
n. [Gr. skotos, darkness; taxis, arrangement] The orientation of an organism towards darkness.
slavery
see dulosis.
slime tubes
see Cuvierian organs.

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