trochophore


trochophore
/trok"euh fawr', -fohr'/, n. Zool.
a ciliate, free-swimming larva common to several groups of invertebrates, as many mollusks and rotifers.
[1890-95; < Gk trochó(s) wheel + -PHORE]

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larva
also called  trochosphere 

      small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. Trochophores are spherical or pear-shaped and are girdled by a ring of cilia (minute hairlike structures), the prototroch, that enables them to swim. Above the prototroch is a sensory plate, an apical tuft of cilia, and an ocellus (simple eye). Below the prototroch are the mouth, stomach, anus, and other structures including the solenocyte, the function of which seems to be to maintain proper internal salt-water balance, and, in some species, one or two additional ciliary rings. In some mollusks (such as gastropods and bivalves), the trochophore develops into a second stage, the veliger (q.v.), before metamorphosing to adult form. Rotifers and the larvae (sometimes considered trochophores) of such invertebrates as phoronids and bryozoans are trochophore-like in appearance.

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Universalium. 2010.

Look at other dictionaries:

  • Trochophore — signifie « en forme de toupie ». Cet adjectif qualifie la morphologie des larves lophotrochozoaires (dont annélides, mollusques). La larve trochophore possède des cils au pôle apical, sur une plaque ectodermique. Elle possède également… …   Wikipédia en Français

  • trochophore — ● trochophore ou trochosphère adjectif et nom féminin Se dit de la larve nageuse des annélides, en forme de toupie, pourvue d un tube digestif, de deux couronnes ciliées locomotrices et d un pinceau apical. trochophore [tʀɔkɔfɔʀ] n. f. ÉTYM. 1904 …   Encyclopédie Universelle

  • trochophore — [träk′ə fôr΄] n. [Gr trochos, a wheel (see TROCHE) + PHORE] a free swimming ciliated larva of several invertebrate groups, including many marine annelid worms, mollusks, brachiopods, and nemerteans …   English World dictionary

  • Trochophore — [ right|thumb|trochophore A episphere B hyposphere 1 ganglia 2 apical tuft 3 prototroch 4 metatroch 5 nephridium 6 anus 8 gastrointestinal tract 9 buccal opening 10 blastocoele] A trochophore (pronEng|ˈtrɒkəfɔər; also spelled trocophore) is a… …   Wikipedia

  • trochophore — noun Etymology: ultimately from Greek trochos wheel + pherein to carry more at bear Date: 1892 a free swimming ciliate larva occurring in several invertebrate groups (as the polychaete worms and mollusks) …   New Collegiate Dictionary

  • trochophore — n. [Gr. trochos, wheel; phora, bearing] An invertebrate free swimming larva found in many groups, marine turbellarians, nemerteans, brachiopods, phoronids, bryozoans, mollusks, sipunculids, and annelids, commonly pear shaped and provided with a… …   Dictionary of invertebrate zoology

  • trochophore — Free living ciliated larval form of several different invertebrate phyla …   Dictionary of molecular biology

  • trochophore — noun The free swimming larva of some invertebrates that have a circlet of cilia …   Wiktionary

  • trochophore — troch·o·phore …   English syllables

  • trochophore — troch•o•phore [[t]ˈtrɒk əˌfɔr, ˌfoʊr[/t]] n. zool. a ciliate, free swimming larva common to several groups of invertebrates, as many mollusks and rotifers • Etymology: 1890–95; < Gk trochó(s) wheel + phore …   From formal English to slang


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