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Dózsa-Farkas, K.; Convey, P. (1997). Christensenia, a new terrestrial enchytraeid genus from Antarctica. Polar Biology. 17(6): 482-486.
240652
10.1007/s003000050146 [view]
Dózsa-Farkas, K.; Convey, P.
1997
Christensenia, a new terrestrial enchytraeid genus from Antarctica
Polar Biology
17(6): 482-486
Publication
Available for editors [request]
Christensenia gen. nov., C. blocki sp. nov., is described from Signy Island, South Orkney Islands, maritime Antarctic. The new species is identical with
specimens that Stephenson (1932) determined as Marionina georgiana (Michaelsen, 1888), but differs from the type material of M. georgiana. The species M. georgiana (Michaelsen, 1888) is also placed in the new genus Christensenia, the main characteristics of which are: possession of sigmoid etae, and the presence of large numbers of small, hyaline, stick-like, nucleate lymphocytes. No other types of lymphocyte are observed. Oesophageal appendages and intestinal diverticulae are absent. Dorsal vessel originates in the clitellar region; blood is colourless. The anteseptal part of the nephridium consists of the funnel and a few canals, with the efferent duct arising postero-ventrally. Spermathecae are without diverticulae, entally connecting with the oesophagus. The known distribution of the genus is currently limited to terrestrial habitats in the sub- and maritime Antarctic.
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Christensenia Dózsa-Farkas & Convey, 1997 accepted as Christensenidrilus Dózsa-Farkas & Convey, 1998 (original description)
Christensenia blocki Dózsa-Farkas & Convey, 1997 accepted as Christensenidrilus blocki (Dózsa-Farkas & Convey, 1997) (original description)
Christensenia blocki Dózsa-Farkas & Convey, 1997 accepted as Christensenidrilus blocki (Dózsa-Farkas & Convey, 1997) (original description)