. Fresh-water biology. Freshwater biology. 209 (210) Tentacles branched. Animals solitary, sessile, discoidal, or sub- spherical, with the surface of the integument indurated. Tentacles flexible, non-contractUe, finely perforate at their ex- tremities. Increasing by gemmation. Dendrocomeles Stein. Representative species. Dendrocomeles paradoxus Stein 1851. Tentacles equal in length to the diameter of the body, usually five or less in number. The distal terminations of the tentacles are capable of great expansion and, by means of these, other Protozoa are captured and the pro- toplasm of their
. Fresh-water biology. Freshwater biology. 209 (210) Tentacles branched. Animals solitary, sessile, discoidal, or sub- spherical, with the surface of the integument indurated. Tentacles flexible, non-contractUe, finely perforate at their ex- tremities. Increasing by gemmation. Dendrocomeles Stein. Representative species. Dendrocomeles paradoxus Stein 1851. Tentacles equal in length to the diameter of the body, usually five or less in number. The distal terminations of the tentacles are capable of great expansion and, by means of these, other Protozoa are captured and the pro- toplasm of their bodies absorbed into the body of the host. Nucleus subtriangular. Diameter of body So//. Fresh water, sometimes attached to Gammarus pulex, a fresh-water shrimp. Fig. 553. Dendrocomeles paradoxus. X 170. (After Stein.) 210(209) Tentacles unbranched, contractile. . 211 211 (220) Without a lorica. ... 212 212 (213) With a stalk. Body spherical or pear-shaped. Tentacles knobbed, scattered, or in groups. In some species the animal may become detached from the stalk and live a free life. Podophrya Ehrenberg. Representative species. . Podophrya fixa MuUer iy86. Stalk slender but rigid. Tentacles slender, scattered over the surface of the body, usually not longer than the diameter of the body. Nu- cleus oval, central. Contractile vacuoles often two. Diameterof body 55fi. Attached to aquat- ic plants. Fig. 554. Podophryafixa. Active individuals. X 210. (After Conn.) Cyst. X 230. (After Edmondson.) 213(212) Without a Stalk . 214 214 (215) Forming colonies. Animals fused, forming an erect, branching colony. Several colonies may be connected by a creeping stolon. Suctorial, capitate tentacles borne on the ends of the branches Dendrosoma Ehrenberg. Representative species. . Dendrosoma radians Ehrenberg 1838. Stolon repent, giving rise to a number of erect branches tapering distally, themselves often branched. Nucleus ribbon- like, ramifying into the branches. Contractile vacuoles nu- merou
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
