D

dacryoid a. [Gr. dakryon, tear; eidos, form] Tear-shaped.

dactyl n.; pl. -tyles [Gr. daktylos, finger] 1. A finger or toe; a dactylus; a pretarsus; a digit. 2. (ARTHRO: Crustacea) The ultimate segment of a thoracopod; a dactylopodite.

dactylethra n. [Gr. daktylethra, finger sheath] (BRYO: Stenol-aemata) A degenerate feeding zooid closed by a terminal diaphragm, or an aborted, shortened polymorph.

dactylognathite n. [Gr. daktylos, finger; gnathos, jaw] (ARTHRO) The distal segment of a maxilliped.

dactyloid a. [Gr. daktylos, finger; eidos, form] Finger-like.

dactylopod(ite) n. [Gr. daktylos, finger; pous, foot] (ARTHRO)

1. The terminal segment of a generalized leg or appendage usually claw-like; the pretarsus. 2. For Crustacea see dactyl.

dactylopore n. [Gr. daktylos, finger; poros, passage] (CNID: Hydrozoa) An opening in the coenosteum of a milleporinan coral for a dactylozooid.

dactylozooid n. [Gr. daktylos, finger; zoon, animal] (CNID: Hydrozoa) In colonial hydrozoans, a hydroid modified for protection and the capture of prey; protective polyp, zooid or machozooid; a hydrocyst; a palpon. see tentaculozo-oid, gastrozooid.

dactylus n. [Gr. daktylos, finger] 1. (ARTHRO: Insecta) A structure of the tarsus. 2. (MOLL: Cephalopoda) see tentacle.

dance n. [OF. dancer, dance] (ARTHRO: Insecta) Communicative movements of honeybees, usually performed on their combs.

daphnid a. [Gr. daphne, laurel] (ARTHRO: Crustacea) Any water flea, esp. those in the genus Daphnia .

dart n. [OF. dard, dagger] 1. Anything that pierces or wounds.

2. (ECHINOD) The spiculum. 3. (MOLL: Gastropoda) A sting or dart of certain snails.

dart sac (MOLL: Gastropoda) A muscular caecum of the vagina that produces a fine-pointed calcareous shaft that is 'shot' by partners before courtship, lodging in the integument and releasing a stimulus for courtship behavior.

Darwinism n. [C. Darwin, English naturalist] The theory of species origin through natural selection working on small inherited differences in individuals.

dauer larvae (nemata) A quiescent stage entered by some parasitic larvae while enclosed in the cast cuticle of the previous stage.

dauermodification n. [Ger. dauer, duration; L. modificare, to regulate] Character change usually induced by extreme environmental factors that survives for several generations.

daughter n. [A.S. dohter, daughter] The offspring of a division, not implying sex, such as in daughter cells or daughter nucleus; a daughter chromosome applies to chromatids after metaphase.

daughter cells The two cells resulting from division of a single cell.

daughter cyst (PLATY: Cestoda) Fluid filled bladder with proto-scolesces formed by exogenous budding of the germinal epithelium of a unilocular hydatid cyst.

day-eye (ARTHRO: Insecta) The apposition eyes adapted for use in daytime when light is abundant.

dealate, -ated a. [L. de, away from; alatus, winged] (ARTHRO: Insecta) Loosing wings, as ants and termites, by casting or breaking off. dealation n.

death n. [A.S. death, death] Irreversible cessation of the activities and breakdown of the structure of protoplasm.

deaurate a. [L. de, away from; auratus, golden] Having a gold color that appears rubbed or worn.

decacanth n. [Gr. deka, ten; akantha, thorn] (PLATY: Cestoda) A ten-hooked larva that hatches from the egg; a lycophore.

decalcification n. [L. de, away from; calcarius, of lime; ficare, to make] Loss of calcium salts from living tissues; removing calcium salts from tissues with acids.

decamerous a. [Gr. deka, ten; meros, part] Having ten parts or divisions.

decapodid larvae (ARTHRO: Crustacea) Larvae of Decapoda that swim with their pleopods; a megalopa stage larva.

decathecal a. [Gr. deka, ten; theke, case] (ANN: Oligochaeta) Earthworms having ten spermathecae, usually in five pairs.

decephalic a. [L. de, away from; Gr. kephale, head] (ARTHRO: Insecta) Having a prognathous head with structures dividing the foramen.

deciduous a. [L. deciduus, falling off] Having a part or parts that may fall off or be shed.

deck n. [D. dek, cover] (MOLL) A septum or small sheet of shelly substance in the umbonal region connecting the anterior and posterior ends of a valve.

declinate a. [L. de, away from; clinatus, sloping] Bending aside in a curve with the apex downward.

declivitous, declivous a. [L. de, away from; clivis, hill] Sloping downward; gradually descending.

decollate a. [L. de, away from; collum, neck] (MOLL: Gastropoda) Pertaining to cut or broken off, as the apex on some land gastropods; wearing away at the apex; decapitation or discarding the apical whorls.

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