Trochosphere see trochophore

trochus n.; pl. trochi [Gr. trochos, wheel] (ROTIF) The inner, anterior circlet of coronal cilia along the margin of the apical band; cingulum.

troglobiont n. [Gr. trogle, hole; bios, life] A cave dwelling organism; troglobite.

troglodytic a. [Gr. trogle, hole; dyein, to enter] Living underground only.

troglophile n. [Gr. trogle, hole; philein, to love] 1. Cave-loving. 2. (ANN: Oligochaeta) Many species of earthworms are referred to in this manner, however, they are not obligatory troglophiles.

trogloxene n. [Gr. trogle, hole; xenos, guest] 1. A cave guest. 2. Sometimes used to characterize organisms that do not complete all of their life cycle in caves.

tropeic a. [Gr. tropis, keel] Resembling a keel; cariniform.

trophallaxis n. [Gr. trophe, food; allaxis, exchange] (ARTHRO: Insecta) The mutual or unilateral exchange of alimentary canal liquid, from the mouth or anus, among colony members of social insects or guests; trophobiosis. trophallactic a.

trophamnion n. [Gr. trophe, food; amnion, membrane around the fetus] (ARTHRO: Insecta) An envelope surrounding the embryonic mass in the polyembryonic ova of mainly parasitic Hymenoptera, formed by cytoplasm in the egg associated with the paranuclear mass, and functioning in relaying nutrients from the host.

trophi n.pl.; sing. trophus [Gr. trophe, food] 1. (ARTHRO) The mouth parts, especially of insects and barnacles, collectively. 2. (ROTIF) The mastacatory apparatus of the mastax. trophal , trophic a.

trophic chord (ARTHRO: Insecta) In telotrophic ovarioles, slender chords connecting the nurse cells to the eggs.

trophic egg (ARTHRO: Insecta) In Apis, an egg that is fed to the colony members, usually degenerate and nonviable.

trophic sac/pouch (ARTHRO: Insecta) In Siphunculata (Ano-plura), a pouch opening off the cibarium housing three closely compressed stylets, with only the anterior end exposed, functioning in piercing the skin for blood meals.

trophic symbiosis A form of symbiosis between a social insect and another organism; tended by the social insect for the sake of the food or secretions they derive from them. see trophallaxis, trophobiont.

trophidium n. [Gr. dim. trophe, food] (ARTHRO: Insecta) In Hymenoptera, the first larval stage of some Formicidae.

trophobiont n. [Gr. dim. trophe, food; bios, life; ont, one who] (ARTHRO: Insecta) An organism living in a social species nest, or cared for and protected by a social species in return for secretions which are then consumed. see mutualism.

trophobiosis n. [Gr. trophe, food; biosis, manner of life] A form of symbiosis in which there is a mutual exchange of food; trophallaxis. trophobiotic a. see trophic symbiosis.

trophocytes n.pl. [Gr. trophe, food; kytos, container] 1. Cells that provide nutritive material. 2. (ARTHRO: Insecta) Cells of the fat body of the embryo. 3. (PORIF) In fresh-water sponges, nurse cells involved in the initial stages of gemmule formation; archaeocytes.

trophodisc n. [Gr. trophe, food; diskos, disc] (CNID: Hydrozoa) In the female gonophore, endodermal tissue that nourishes sperm or ova.

trophogeny n. [Gr. trophe, food; genes, producing] (ARTHRO: Insecta) In social insects, caste difference determined by nutritional mechanism.

trophoporic field (ARTHRO: Insecta) In social insects, the environment from which the colony gains food.

trophorhinium n. [Gr. trophe, food; rhine, rasp] (ARTHRO: Insecta) In Hymenoptera, two striated plates located within the mouth of Myrmeciinae larvae that grind their food pellets.

trophosome n. [Gr. trophe, food; soma, body] 1. (CNID: Hydrozoa) All of the asexual structures of a polyp or polypoid hydrozoan colony. see gonosome. 2. (NEMATA) A food storage area of certain parasitic nematodes formed by modification of the intestine.

trophotaxis n. [Gr. trophe, food; taxis, arrangement] A response to the stimulation of food. see telotaxis, klino-taxis.

trophothylax n. [Gr. trophe, food; thylax, sack] (ARTHRO: Insecta) In Hymenoptera Formicidae, a specialized pouch of Pseudomyrmecinae larvae located on the ventral part of the thorax just beneath the mouth parts that receives food pellets; a feed bag.

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