Author/Editor		Sket, B; Fišer, C
Title		A new case of intralacustrine radiation in Amphipoda. A new genus and three new species of Anisogammaridae (Crustaceam, Amphipoda) from the ancient lake Fuxian Hu in Yunan, China
Type		članek
Source		J Zool Syst Evol Res
Publication year		2008
Volume		str. 1-9
Language		eng
Abstract		Fuxian Hu is a deep freshwater lake in the high plateau in Yunnan Province, China. After a study and description of Fuxiana yangi Sket, 2000 from deep waters, some co.istal samples of amphipods were taxonomically evaluated. Four species were recognized, which in winter co-occur along most of the shallow littoral zone around the lake; they were identified as members of the family Anisogammtiridae. One species was recognized as a slightly differentiated Eurypodogammarus helobius Hou et al., 2005, and the others as new species of Fuxigammarus gen. n. Results of a cladistic analysis performed on morphological characters from published descriptions, which included all lacustrine taxa and representatives of all other anisogammarid genera, established the monophyly of the new genus. Endemic character and monophyly of the group testify to an intralacustrine radiation within Fuxigammarus. Fuxian Hu is the fifth known lake in the world to contain a radiation of amphipods and is the only one inhabited by members of Anisogammaridae. Fuxigammarus gen. n. is characterized by a small and slender body, scant dorsal setosity-spinosity, and single, sausage-shaped accessory lobes on coxal gills, anlennae without calceoli and rod shaped uropod III. These species differ substantially from each other by characters that do not occur iu other anisogammarid genera. The type species F. antespinosus sp. nov. has spiniform dorsal setae shifted forward. Fuxigammarus barbatus sp. nov. has extremely setose antennal bases and mandibular pulps and an elongated proximal ftagellar article of antenna II. Fuxigammarus cornutus sp. nov. hes a pair of dorsal spiniform setae only on humped urosomite I and the usually spiniform setae replaced by flexible setae on the telson. These characters are a kind of counterpart to the specific body armature of the Bajkal amphipods.
Descriptors		CRUSTACEA PHYLOGENY FRESH WATER