Circumpharyngeal commissures connectives ANN

gochaeta) The two parts of the nerve collar surrounding the esophagus and linking the ventral nerve cord with the cerebral ganglia.

circumscissile a. [L. circum, around; scindere, to cut] Splitting along a circular line, as in hatching.

circumsepted a. [L. circum, around; septum, partition] (AR-THRO: Insecta) Pertaining to a wing being encircled by a vein.

circumversion n. [L. circum, around; vertere, to turn] (AR-THRO: Insecta) In Diptera, the rotation of the postabdomen during imaginal development.

circumvolution n. [L. circum, around; volvere, to turn around] Around an axis or center; a whorl; rotation; revolution.

cirral ossicles (ECHINOD: Crinoidea) Pertaining to the small ossicles of a cirrus of sea lilies.

cirrate a. [L. cirrus, curl] Having curls or cirri.

cirrate antenna (ARTHRO: Insecta) An antenna with very long curved lateral branches, with or without fringes of hair; a pectinate antenna. see plumose.

cirri pl. of cirrus cirriferous a. [L. cirrus, curl; ferre, to bear] Bearing a curl or tendril.

cirrophore n. [L. cirrus, curl; Gr. phorein, to bear] (ANN: Poly-chaeta) The basal section of a cirrus.

cirrose, cirrous a. [L. cirrus, curl] Bearing tendrils or cirri.

cirrostyle n. [L. cirrus, curl; Gr. stylos, pillar] (ANN: Poly-chaeta) The distal section of a cirrus.

cirrus n.; pl. cirri [L. cirrus, curl] 1. Any slender, usually flexible structure or appendage. 2. Has been used for hair on appendages of insects and male copulatory organs in various invertebrates. 3. (ANN: Polychaeta) Small, tentacle-like protuberances on the parapodia, peristomium and py-gidium. 4. (ARTHRO: Crustacea) In barnacles, a thoracic multiarticulate appendage, usually flattened laterally and curled anteriorly, with food gathering function. 5. (echi-NOD: Crinoidea) The aboral ring of unbranched jointed appendages, curved and tapered at the end that aid in fas tening to rocks, coral or soft substrata. 6. (MOLL: Bivalvia) A bundle of fused cilia that filters particles from the water entering the gill. 7. (nemata) Elaborate cephalic appendages such as those found in Chambersiella. 8. (platy) The penis or copulatory organ of trematodes and cestodes.

cirrus acuum (ARTHRO: Insecta) A rounded sclerotized form of cornuti of male Lepidoptera, often bearing dense spine-hairs.

cirrus pouch or sac Pouch or sac containing the copulatory organ (cirrus) of various invertebrates.

cisternae [L. cisterna, underground reservoir for water] Any of various flattened, membranous, fluid-filled vesicles.

cistron n. [Gr. kiste, box] The functional gene; the section of a DNA molecule that specifies the formation of a particular polypeptide chain.

citrine a. [L. citrus, citron-tree] Lemon-yellow in color.

citron shaped Having the form of a large lemon.

cladi, clads [Gr. klados, branch] (PORIF) The three shorter rays of a tetraxon spicule, that may be forked or branched at their free ends.

cladism n. [Gr. klados, branch] A method by which organisms are ordered and ranked entirely on the basis of the most recent branching point of the inferred phylogeny. cladistic a.

cladocerous a. [Gr. klados, branch; keras, horn] Having branched horns or antennae.

cladogenesis n. [Gr. klados, branch; genesis, beginning] Branching evolution; the splitting of species, i.e., speci-ation. see anagenesis.

cladogram n. [Gr. klados, branch; gramma, picture] A dendrogram based on the principles of cladism; a strictly genealogical dendrogram, ignoring rates of evolutionary divergence.

cladome n. [Gr. klados, branch] (PORIF) The three short rays or cladi of a tetraxon spicule.

cladotylote a. [Gr. klados, branch; tylos, knob] (PORIF) In di-actinal monaxons, a tylote having somewhat recurved clads at each end.

cladus n.; pl. cladi [Gr. klados, branch] (PORIF) Smaller branch of a tetraxon spicule. cladose a.

clamp n. [D. klamp] (platy: Trematoda) A complex set of sclerotized bars, forming a pinching organ on the opist-haptor of a monogenetic trematode.

clandestine evolution Evolutionary change introduced and developed in juvenile stages and incorporated into descendant adult stages by paedomorphosis.

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