ISSN 10630740, Russian Journal of Marine Biology, 2013, Vol. 39, No. 3, pp. 182–189. © Pleiades Publishing, Ltd., 2013.
Original Russian Text © A.V. Lavrent’eva, L.A. Tzareva, 2013, published in Biologiya Morya.
G.O. Sars, 1865 is to date
the largest in the order Cumacea and contains about
170 species . Eight species of this genus have been
described from depths of 9 to 1011 m in the northwest
ern Sea of Japan [1–4]. In the present paper, we
describe a new deepsea species,
sp. n., that was found in the Sea of Japan.
MATERIALS AND METHODS
The material of this study was collected by a deep
(Sea of Japan Biodiversity Studies) expe
dition with the R/V
Akademik M.A. Lavrentyev
(51st cruise) in August–September of 2010. Material
sampled with a newly modified cameraepibenthic
) was fixed with cooled 96% ethanol (at
stations A210, A310, B66, B76) and 4% formalin
(at stations B77 and B67); after 48 h the material was
washed and refixed with 96% ethanol.
sp. n. was found at six stations at depths
from 455 to 1356 m (see table). Two females of this
species were also found in the collections made during
the 59th cruise of the R/V
in 1976 at depths
of 250 and 1550 m (see table). In all, 142 specimens of
sp. n. were found; of these 26 were
males (nine adults), 67 were females (five with marsu
pium), and the rest were juveniles.
The morphological study and figures were per
formed using a Stereo Discovery V12 stereomicro
scope (Zeiss) equipped with a drawing tube; details of
morphology were examined under a Laboval 4 micro
scope equipped with a Lomo RA 7U 4.2 drawing tube.
A part of the material was examined with a Zeiss
Evo 40 scanning electron microscope (SEM). Speci
mens were passed through a series of alcohol and ace
tone in ascending concentration, critical point dried,
mounted on desks, and sprayed with a mixture of plat
inum and palladium. The type specimens are depos
ited in the Museum of the Zhirmunsky Institute of
Marine Biology Far East Branch, Russian Academy of
Sciences (MIMB, Vladivostok) and in the Zoological
Museum of Hamburg University (ZMH).
Family Nannastacidae Bate, 1866.
G.O. Sars, 1865.
Lavrenteva et Tzareva sp. n.
female, 5.5 mm, MIMB 27104, Sea of
Japan, 51st cruise of the R/V
Akademik M.A. Lavren
E, depth 455–565 m, 14.08.2010.
five females and three males, MIMB
27105–27108, collected together with holotype
(description is based on a male 8 mm long); three
females and one male,
43305, collected together
Additional material examined: 129 specimens from
eight samples (see table).
Lateral sides of carapace with an elon
gated depression limited by distinct upper ridge and
less expressed lower ridge. Eye lobe without lenses.
sp. n., A New Cumacean Species
(Cumacea: Nannastacidae) from the Bathyal Zone
of the Sea of Japan
A. V. Lavrent’eva
and L. A. Tzareva
Zhirmunsky Institute of Marine Biology, Far East Branch, Russian Academy of Sciences, Vladivostok, 690059 Russia
Far Eastern Federal University, School of Natural Sciences, Vladivostok, 690060 Russia
Far Eastern State Marine Biosphere Reserve, Far East Branch, Russian Academy of Sciences, Vladivostok, 690059 Russia
Received November 22, 2012
—This paper describes a new cumacean species,
sp. n., which was found
in the northwestern Sea of Japan at 250–1550 m.
sp. n. is most similar to
1958, but it differs from the latter species in the shape and size of the depression on the carapace, the absence
of eye lenses, and a smaller ratio of the uropod peduncle length to the endopod.
, Cumacea, Nannastacidae, bathyal, Sea of Japan