Digametic see heterogametic

digenesis n. [Gr. dis, twice; genesis, beginning] Alternation of generations.

digenetic a. [Gr. dis, twice; genesis, beginning] With sexual reproduction in the mature forms and asexual reproduction in larval stages.

digenoporous a. [Gr. dis, twice; genos, birth; poros, passages] Having two genital pores.

digestion n. [L. digestus, render food assimilable] The process by which nutrient materials are rendered soluble and absorbable for incorporation into the metabolism.

digit n. [L. digitus, finger] A finger or finger-like structure; a toe.

digital a. [L. digitus, finger] Digit-like.

digitated a. [L. digitus, finger] Fingered or clawed; divided into finger-like processes.

digitate processes (SIPUN) Finger-like processes or leaf-like projections originating at the dorsal surface of the brain.

digitation n. [L. digitus, finger] (MOLL: Gastropoda) The fingerlike, outward projection from the outer lip of the shell.

digitelli n.pl. [L. dim. digitus, finger] (CNID: Scyphozoa) Tentacle-like gastric filaments on the inner edge of each septum.

digitiform a. [L. digitus, finger; forma, shape] Shaped like, or functioning like a finger.

digitules n. [L. digitulus, little finger] (ARTHRO: Insecta) Appendages in the form of dilated or knobbed hairs on the feet of scale insects. see empodium.

digitus n.; pl. -ti [L. digitus, finger] 1. A digit. 2. (ARTHRO: Insecta) a. The dactylus. b. In Hymenoptera genitalia, a curved or hooked, strongly muscled process projecting from the vosellar plate, movably opposed to the cuspis.

diglyphic a. [Gr. dis, twice; glyphein, to engrave] (CNID: An-thozoa) In sea anemones, having two siphonoglyphs: one siphonoglyph= sulcus; two siphonoglyphs= sulculus.

dignathan a. [Gr. dis, twice; gnathion, jaw] (ARTHRO) Having mandibles and one pair of maxillae, such as Pauropoda and Diplopoda. see trignathan.

digoneutic a. [Gr. dis, twice; goneuein, to produce] Having two broods in one year. digoneutism n.

digonic a. [Gr. dis, twice; gone, seed] Sperm and ova are produced in separate gonads of the same individual. see syn-gonic, amphigonic.

dikont a. [Gr. dis, twice; kontos, punting pole] Biflagellate.

dilacerate v.t.; -ated [L. dis, apart; lacera, torn] To tear to pieces; tear apart.

dilatated a. [L. dilatus, spread] Having a wide margin; flattened; expanded; widened.

dilate v.t. [L. dilatus, spread] To expand or distend.

dilator n. [L. dilatus, spread] A muscle that functions to dilate.

dilator valve (NEMATA) Ventrolateral hypodermal muscles that function to open the vulva. see constrictor valve.

dilute a. [L. dilutus, mixed] Being diluted; thin; weak.

dimeric a. [Gr. dis, twice; meros, part] 1. Having two parts. 2. Bilaterally symmetrical.

dimerous a. [Gr. dis, twice; meros, part] 1. Composed of two parts. 2. Having two tarsal segments.

dimidiate a. [L. dimidius, half] 1. Divided into two equal parts. 2. Only one-half the normal development. 3. (ARTHRO: In-secta) Having an elytra that covers only half the abdomen.

dimorph n. [Gr. dis, twice; morphe, form] An individual displaying dimorphism.

dimorphism n. [Gr. dis, twice; morphe, form] A morphological difference in form, color, size or sex in a single population. dimorphic a. see sexual dimorphism, polymorphism.

Dimyaria n.pl. [Gr. dis, twice; mys, muscle] (MOLL: Bivalvia) Taxon sometimes used to include those bivalve mollusks whose shells are closed by two adductor muscles; dimyarian, dimyaric a.; dimyarian a. & n.

dinergate n. [Gr. deinos, terrible; ergates, worker] (ARTHRO: Insecta) A soldier ant, characterized by a huge head and mandibles (for defense) and a thoracic structure sometimes the size of the female, or in the development of its sclerites.

dinergatogyne n. [Gr. deinos, terrible; ergates, worker; gyne, woman] (ARTHRO: Insecta) A mosaic form in ants, combining the characteristics of a dinergate and a ergatogyne.

dinergatogynomorph n. [Gr. deinos, terrible; gyne, woman; morphe, form] (ARTHRO: Insecta) In ants, any individual in which female characteristics alternate with worker and soldier.

dinophthisergate n. [Gr. deinos, terrible; phthisis, decline; ergates, worker] (ARTHRO: Insecta) In ants, a soldier-worker pupal mosaic that fails to progress to the adult stage due to parasitism or other interference.

dioecious a. [Gr. dis, twice; oikos, house] Separate sexes; males and females being different individuals; gonochoris-tic; unisexual; opposed to monoecious.

dioptrate a. [Gr. dis, twice; ops, eye] Having eyes or ocelli divided by a septum or line.

dioptric a. [Gr. dis, twice; ops, eye] Refractive; vision by refraction of light.

diorchic a. [Gr. dis, twice; orchis, testicle] Having two testes. see monorchic.

diphagous parasitoid (ARTHRO: Insecta) In Hymenoptera, a species in Adelinidae in which the male (parasitoid) and female inhabit the same host species, but both feed differently. see heterotrophic parasitoid, heteronomous hy-perparasitoid.

diphygenetic a. [Gr. diphyes, twofold; genesis, beginning] Producing two different types of embryos.

diphyletic a. [Gr. dis, two; phyle, race) Pertaining to animals which are derived from two ancestral lines.

dipleurula n. [Gr. dis, twice, dim. pleuron, side] (ECHINOD) Collective term applied to planktonic bilaterally symmetrical, ciliated larvae; echinopaedium. see auricularia, doli-olaria, pluteus, bipinnaria larva.

diplobiont n. [Gr. diploos, twofold; bionai, to live] An organism with two morphologically distinct haploid and diploid generations. see haplobiont.

diploblastic a. [Gr. diploos, twofold; blastos, bud] Having two embryonic germ layers, ectoderm and endoderm.

diplocotylea cercaria (PLATY: Trematoda) An amphistome cercaria with a pigmented anterior end. see pigmenta cercaria.

diplodal a. [Gr. diploos, twofold; hodos, way] (porif) Leucon-oid sponges with narrow canals leading into and out of the flagellated chambers. see aphodus, prosodus.

diploergate n. [Gr. diploos, twofold; ergates, worker] (ARTHRO: Insecta) A mosaic ant showing characteristics of both major and media workers.

diplogangliate a. [Gr. diploos, twofold; ganglion, ganglion] With paired ganglia.

diploid a. [Gr. diploos, twofold] Having dual (2n) chromosomes, the normal number of cells in all but the mature germ cells in any individual derived from a fertilized egg. see duplex, haploid, polyploid, chromosome.

diplokaryon n. [Gr. diploos, twofold; karyon, nut] The nucleus of the zygote containing two diploid genomes. see amphi-karyon.

diplonema a. [Gr. diploos, twofold; nema, thread] When chromosome tetrads begin separation, resulting in chias-mata at the points of cross over; sometimes used to denote diplotene stage.

diploneural a. [Gr. diploos, twofold; neuron, nerve] Having a double nerve supply.

diplont n. [Gr. diploos, twofold; on, being] An organism with diploid somatic cells and haploid gametes. see haplont.

diplophase n. [Gr. diploos, twofold; phasis, state] Diploid phase in the life cycle of an animal (fertilization to meio-sis); diplotene stage in the prophase of meiosis; zygo-phase. see haplophase.

Diplopoda, diplopod n. [Gr. diploos, twofold; pous, foot] A class of arthropods, commonly called millipedes, having the body somites fused into diplosegments, each with two pairs of legs.

diplosegment n. [Gr. diploos, twofold; L. segmentum, piece] (ARTHRO: Diplopoda) Fusion of two body segments resulting in a segment with two pairs of legs each; a diplosomite.

diplosome n. [Gr. diploos, twofold; soma, body] A double centrosome; paired centrioles.

diplosomite n. [Gr. diploos, twofold; soma, body] (ARTHRO: Diplopoda) A diplosegment. see prozonite, metazonite.

diplostenoecious a. [Gr. diploos, twofold; stenos, narrow; oikos, house] Pertains to the phenomena of certain species occurring in two contrasting habitats.

diplostichous a. [Gr. diploos, twofold; stichos, line] 1. Arranged in two rows or series. 2. (NEMATA: Adenophorea) In Mermithida, the stichosome.

diplostomulum n. [Gr. diploos, twofold; L. dim. stoma, mouth] (PLATY: Trematoda) Strigeoid metacercaria in the family Diplostomatidae.

diplotene a. [Gr. diploos, twofold; tainia, ribbon] The fourth stage of meiotic prophase one when paired chromatids be gin to separate. see diplonema.

diplozoic a. [Gr. diploos, twofold; zoon, animal] Bilaterally symmetrical.

dipneumonous a. [Gr. dis, twice; pneumon, lung] Having two lungs.

diporpa n. [Gr. dis, twice; porpe, buckle] (PLATY: Trematoda) A larval stage in the life cycle of the monogean Diplozoon that permanently unites with another.

dipterocecidium n. [Gr. dis, twice; pteron, wing; dim. kekis, gall] (ARTHRO: Insecta) A gall formed by any dipterous insect.

dipterous a. [Gr. dis, twice; pteron, wing] (ARTHRO: Insecta) Belonging to the insect order Diptera.

direct eyes (ARTHRO: Chelicerata) The anterior median pair of eyes in spiders.

directive mesentaries (CNID: Anthozoa) In Zoantharia, the dorsal and ventral pairs of specialized mesentaries attached to the siphonoglyph.

directive rib (MOLL: Bivalvia) A rib on the shell surface lying in a single plane.

directive spiral (MOLL: Bivalvia) A directive rib that is spiral in a single plane.

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