Fan, Xue-Ming, Shi Xin Bai, 2003. A new species of the genus Hydra from China (Hydrida, Hydraridae). Acta Zootaxonomica Sinica 28 4: 610-613.

38557

Fan, X.; Shi, X. B.

2003

28(4): 610-613

Publication

A new species: Hydra harbinensis sp. nov. is described. H. harbinensis is only similar to H. hymanae (Hadley and Forrest, 1949), but many distinctions between the two species can be still detected. 1) The new species lives in still water, and can climb to the side or bottom of the container. It can live and reproduce in stored tap water under laboratory conditions. However, H. hymanae occurs on the undersides of leaves and stones in rapidly flowing brooks, the basal end of the column commonly shows a distinct curve, and the body is parallel with the substratum. The latter can be cultured successfully only when kept it in very cold, filtered water obtained from its natural habitat and has a slow rate of reproduction. 2) The size of the largest artrichous isorhizas in the new species is only equal to that of the smallest one in H. hymanae. 3) The new species may form 2-6 unpapillary blunt cone-shaped testes, and 4-6 eggs; H. hymanae forms 12 testes which sometimes have a papillary shape, and only two eggs. 4) The spines of the new species are not knobbed at the tip on the outer surface of the embryo theca, which is different from the knobbed end of spines in H. hymanae. Holotype 86 ( hermaphroditic), Harbin City (45[degree]74[minute]N, 126[degree]69[minute]E), 2 Sep. 1997, Heilongjiang Province, collected by FAN Xue-Ming. The type specimen is deposited in the Laboratory of Invertebrate Zoology, Department of Biology, Harbin Normal University. Descriptor: Hydra harbinensis

Systematics, Taxonomy

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