1063-0740/01/2704- $25.00 © 2001
Russian Journal of Marine Biology, Vol. 27, No. 4, 2001, pp. 208–217.
Original Russian Text Copyright © 2001 by Biologiya Morya, Kusakin, Vasina.
The extensive materials on deep-sea isopods col-
lected by different Soviet expeditions in the 1970s–
1980s make up a collection of arcturids (Valvifera, Arc-
turidae) from the Antarctic and Subantarctic waters
which we have described elsewhere in a series of papers
[1–3, 6–9]. In the ﬁrst of the cited papers we described
two new species of the genus
Later on, we
discovered in these collections two more new species of
this genus. The descriptions of the latter are presented
in this paper, as well as some supplementary informa-
tion about the species
Kussakin et Vasina,
The type specimens of the described new species are
deposited in the collections of Zoological Institute,
Russian Academy of Sciences in St. Petersburg and the
Zoological Museum of Moscow State University in
Kussakin et Vasina, 1980
Kusakin and Vasina, 1980: 34–37, ﬁgs. 3–4;
Wagele, 1991: 102, ﬁgs. 31B, 32B.
Southwestern Atlantic. Continental
slope of Patagonia (47
W), 750 m deep,
RV “Zund,” May 18, 1974, one ovigerous female
25.5 mm long, two males 23.3 and 19.6 mm long. Con-
tinental slope at the Falkland Islands, RV “Kurchatov,”
Stn. 929, 52
W, 720–724 m deep,
December 17, 1971, three fragments; Stn. 930, 51
W, 401 m deep, December 18, 1971, one oviger-
ous female 22.5 mm long and two males 18.3 and
21.0 mm long.
Kussakin et Vasina sp. n.
Southwestern Atlantic Ocean. Continen-
tal slope of Patagonia (47
W, 750 m deep,
RV “Zund,” May 18, 1974, trawl, coll. I.S. Smirnov.
The holotype: one ovigerous female 42 mm long, cata-
logue of ZIN no. 1/88341; paratypes: one female 44
mm long with empty brood pouch, one damaged
female 31.5 mm long, and one male with damaged
cephalothorax about 31 mm long, catalogue of ZIN no.
Female, the holotype. The body is
elongated, almost cylindrical in shape, but pereonites
II–IV are somewhat expanded; the body is about
5.3 times as long as wide in the area of pereonite III.
The dorsal surface of cephalothorax has a pair of rela-
tively short supraorbital spines and a transverse row of
small rounded submedian tubercles in the posterior
part; the more median pair of these tubercles is larger
than the others; lateral margins are straight; the frontal
margin is deeply concave in its median portion. Eyes
are large, of a rounded-triangular shape, in specimens
preserved in alcohol the eyes are black colored.
Pereonite I is fused with the head, but clearly demar-
cated dorsally and, especially, laterally by a transverse
groove without lateral notches. Its dorsal surface bears
three rounded elevations. Pereonites I–IV bear large
supracoxal spines; pereonites V–VII have small supra-
coxal spines. Pereonites I–IV and VII are provided with
short stout anterolateral spines. The posterior margins
of all pereonites are somewhat elevated.
Supplements for the Fauna of Arcturid Isopods
of the Genus
(Crustacea, Isopoda, Valvifera)
of the Antarctic and Subantarctic
O. G. Kusakin and G. S. Vasina
Institute of Marine Biology, Far Eastern Division, Russian Academy of Sciences, Vladivostok 690041, Russia
Received September 21, 2000
—Supplementary materials on deep-sea arcturids of the southwestern Atlantic and the adjacent sector
of the Antarctic are discussed. The descriptions are provided for two new species of the genus
ardson inhabiting the bathyal zone,
sp.n. from the continental slope of Patagonia, and
from the Drake Passage. The geographical ranges and vertical distributions of 21 species of the genus
Key words: isopods, arcturids of the Antarctic and Subantarctic