act in opter an (aktinopteran)

Act in opter i; an act in opter ous fish. Act in opter i (ak-ti-nop'te-ri), n. pl. of act in opter us: see act in opter ous.] In Cope's system of cla ification, a subcla of fishes embracing all the teleosts, most of the o eous ganoids, and the sturgeons. The technical characters of the group are opercular bones well developed on a separate and complex suspensorium, a double ceratohyal, no pelvic elements, primary radii of the fore limb parallel with basilar elements and entering into the articulation with the scapular arch, and basilar elements reduced to a meta pterygium and very rarely a me so pterygium. act in opter ous (ak-ti-nop'te-rus), a. [ + πτερόν , tin opter us, ing to the Act in opter i. act i no soma (akti-no-so'mä), n.; pl. actinoso mat a (-ma-tä). [ Gr. ἀκτίς (ἀκτιν-), ray, + σώμα , IMG:content-0223.png:[ocr errors][subsumed][subsumed][ocr errors][subsumed][merged small][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed] Sun-animalcule (Actinospharium eichhornt), magnified. 1. The whole animal, with e, c, contractile vacuoles. II. Portion of nuclei endoplasts. III. A young actinosphærium. Pourpre morgnified with you four stiff pseudopodia, and ", having a number of nuclei or endoplasts in the central parts of the protoplasm, and numerous stiff radiating pseudopodia. Neither conjugation nor fi ion has been observed among ordinary Radio lari a, but both these proce es take place in Actinosphærium. Huxley , Anat. Invert., p. 85. 2. [l. c.] A member of this genus. actinost (ak'ti-nost), n. [ ὀστέον , a bone.] In ichth ., one of the bones which in true fishes immediately support the rays of the pectoral and ventral fins. They are generally, in the pectorals, four in number, but sometimes, as in some pediculates, are reduced to two, and sometimes, as in ganoids, increased to more than four; they are rarely atrophied. Gill. nished with rays,