1063-0740/04/3001- © 2004
Russian Journal of Marine Biology, Vol. 30, No. 1, 2004, pp. 56–60.
Original Russian Text Copyright © 2004 by Biologiya Morya, Labai.
The family Ocypodidae Ortmann comprises littoral
and estuarine crabs inhabiting subtropical, tropical, and
equatorial seas. Members of this family have not previ-
ously been reported for the seas of the Russian Far East.
In August 1998, in the estuary of the Srednyaya River
(Sakhalin Island, Aniva Bay, Sea of Okhotsk), a male
De Man, 1895
was found by the author. Repeated examination of the
estuary in June 2003 resulted in a ﬁnding of ten more
specimens (nine males and one female).
The species inhabits the coastal zone of the Japanese
Archipelago off Honshu, Shikoku, and Kyushu islands.
Its range includes the Korean, Vietnamese, and Chinese
coasts extending northwards to the Yellow Sea . The
northern boundary of the range is considered Mutsu
Bay (Aomori Prefecture) . The present article was
inspired by the fact that no detailed description of the
species is currently available.
De Man, 1895
De Man, 1895, p. 590;
Tune, 1976, p. 619, Pl. 211, Fig. 3.
(Fig. 1a). The carapace is wide oval, convex,
hard, slightly narrowing caudally, covered with small
dark setae. The width of the carapace is 1.4 times its
length. The frontal margin of the carapace is wide with
a shallow smoothed depression. The orbits are bordered
posteriorly with a transverse ridge, densely fringed
with small dark setae and extending almost to the
medial line. The eyes are placed on long eyestalks and
occupy a zone between the base of the antennae and the
anterolateral tooth of the carapace. The epibranchial
and mesobranchial regions of the carapace are bordered
posteriorly with transverse ridges. The ridges are bent
forward, fringed with small setae, and armed with
smoothed teeth along their edges. The lateral portions
of the epibranchial region each have a pair of oblique
rises. The boundary area between the epibranchial and
hepatic regions has a small ridge, bent forward and
fringed with setae. The posterior border of the meso-
gastric region ends with a ridge, sharply bent forward
and bearing setae. The metagastric region is bordered
posteriorly with a pair of transverse ridges, bent for-
ward. The ridges converge medially and have short
setae. The posterior borders of the cardiac and
metabranchial regions have ridges. The cardiac region
has two oblique ridges converging at a sharp angle to its
posterior border. All the ridges have short ﬁrm setae.
The lateral edges of the carapace are densely fringed
with thin pinnate setae.
The ventral part of the carapace lacks ridges. The
portions of the sternites not covered with the abdomen
are smooth, with the edges covered with small granules
(Fig. 1b). The anteromedial edge of somite I makes an
obtuse angle with two granulated rises adjacent to it.
The lateral part of somite I has the shape of a right tri-
angle. Somites II, III, and IV are extended laterally,
with their lateral parts bent backward. Somite IV is
wider and shorter than somites II and III. Somite V is
small, rectangular in shape, and can be entirely with-
drawn into the notch of somite IV. The suborbital and
pterygostomian regions of the carapace have the shape
of an acute triangle and are extended laterally. The ante-
rolateral edge of the carapace is granulated and armed
with a single rounded anterolateral tooth. The postero-
lateral edges of the carapace are hidden in a dense
fringe of pinnate setae.
The abdomen consists of 5 segments. The ﬁrst seg-
ment is short. The fourth and second segments are,
respectively, 1.2 and 1.8 times as wide as the third and
ﬁfth segments (Fig. 1c). The second and ﬁfth segments
are colored with melanocytes.
De Man, 1895 (Crustacea: Decapoda),
A Crab Species New for the Fauna of Russia
from the Estuarine Waters of the South Sakhalin
V. S. Labai
Sakhalin Institute of Scientiﬁc Fisheries and Oceanography, Yuzhno-Sakhalinsk 693000, Russia
Received June 2, 2003
—In the estuary of the Srednyaya River (Sakhalin Island, Aniva Bay, Sea of Okhotsk), several speci-
De Man, 1895 were found. This ﬁnding extends considerably the range of
this warm-water species northward. A detailed morphological description of the species is provided.
, estuary, structure, geographic distribution.