Thymops birsteini

(Zarenkov and Semenov, 1972)

Diagnosis:
Second and third maxillipeds with exopods. Exopod of second maxilliped without flagellum. Lower margin of rostrum without teeth. Pleura of abdominal somites broadly overlapping.

Type:
Type locality: "Akademik Knipovich" Station 1021, 49°00.8'S 57°07.6'W, 515-525 m. Holotype male in Zoological Museum, University of Moscow.

Geographical Distribution:
Continental shelf of southern tip of South America, on the Atlantic side (Argentina) south of 37°S, on the Pacific side (Chile) south of 51°S; including the area north, east and southeast of the Falkland/Malvinas Islands, and east of South Georgia. The entire area lies between 37° and 57°S and 35° and 76°W.

Habitat and Biology:
Deep sea between 122 and 1400 m, mostly between 122 and 900 m.

Size:
Total length reported from 8 to 25 cm; carapace length from 2 to 10 cm (mostly between 3 and 6 cm). Ovigerous females with cl 3.4 to 7.4 cm.

Interest to Fisheries:
According to Boschi, Irio and Fischbach (1982:233) the species would be of potential interest off the Argentine coast if large concentrations could be detected.

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