Kation see cation

Keber's valve (MOLL: Bivalvia) Pericardinal gland, connecting the pedal and visceral hemocoels.

keel n. [A.S. ceol, ship] 1. A prominent ridge or carina. 2. (bryo) a. In Stenolaemata, a flat median portion of the zo-oidal wall between sinuses in recumbent part of endozone or as a synonym of carina. b. In Phylactolaemata, a median longitudinal ridge along recumbent tubular colony parts. 3. (MOLL: Gastropoda) A spiral ridge usually marking a change of slope in the outline of the shell.

Keferstein bodies (SIPUN) Small oval bodies on the inner or coelomic surface of the body wall.

kenozooid n. [Gr. kenos, empty; zoon, animal; eidos, like] (BRYO) 1. In Stenolaemata, a polymorph without a lopho-phore, gut, muscles, and orifice. 2. In Gymnolaemata, a polymorph without an orificial wall or equivalent, lopho-phore, alimentary canal, and usually muscles.

kentrogon n. [Gr. kentor, piercer; gone, that which generates] (ARTHRO: Crustacea) In Rhizocephala, undifferentiated cells formed after the cyprid larval molts and its appendages and carapace are discarded, that penetrates the integument of a Decapoda host.

kentromorphism n. [Gr. kentor, piercer; morphe, form] (ARTHRO: Insecta) A change brought about by environmental stimuli (high or low population density) in phasmatids, locusts, the larva of Lepidoptera and a few other insects, that cause coloration and pattern differences, anatomical proportions, physiology and behavioral differences. see gregaria, solitaria.

kentron n. [Gr. kentor, piercer] (ARTHRO: Crustacea) In Rhizocephala, a hollow stylet in the anterior body of a kentrogon that invades the antennule and pierces the integument of its host.

keratin n. [Gr. keras, horn] A sulfur-containing nitrogenous compound found in animal tissues such as horn, hair and nails.

keratinization n. [Gr. keras, horn] Conversion of tissues into keratin or keratin-like tissue. see cornification.

keratose a. [Gr. keras, horn] Having horny fibers in the skeletal structure, as in certain Porifera.

kermes (Generic name) A red dye made from the dried bodies of female coccids of kermococcus ilicis; granum tinctorium.

key n. [ME. key] A tabulation of diagnostic characters of organisms most often in dichotomous couplets facilitating rapid identification.

kidney shaped Shaped like a kidney; reniform.

kinaesthesis, kinesthesis n. [Gr. kinein, to move; aisthesis, perception] Perception of movement by internal stimulation; proprioceptors.

kinase n. [Gr. kinein, to move; -asis, enzyme] Enzymes that catalyse the transfer of high energy groups from a donor to an acceptor; named for acceptor; enzyme which activates a zymogen.

kinesis n. [Gr. kinesis, movement] Responses not directed to a variation in the stimulus or orientation of the body axis to the source of stimulation; movement resulting from a kinesis is random. see taxis, tropism.

kinesodic a. [Gr. kinesis, movement; hodos, way] Conveying motor impulses.

kinetoblast n. [Gr. kinetos, move; blastos, bud] Outer covering of aquatic larvae equipped with locomotory cilia.

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