ISSN 1063-0740, Russian Journal of Marine Biology, 2006, Vol. 32, No. 2, pp. 129–136. © Pleiades Publishing, Inc., 2006.
Original Russian Text © V.S. Levin, 2006, published in Biologiya Morya.
Far-eastern holothurians with treelike tentacles have
not yet been studied sufﬁciently, although the group
was considered in a number of publications [1, 2, 3, 4,
5, 6, 12, 13, 16]. Holothurians of the Sea of Okhotsk are
also poorly studied. Recently, three species of large
cucumarians have been described:
 from water areas around
Sakhalin Island and
, a mass
species from the western coasts of Kamchatka. During
the 27th and 29th cruises of the research vessel
, several tiny holothurians were collected
in western and southeastern areas of the Sea of
Okhotsk; they appeared to be new species, one of them
belongs to a new genus. When handling the collection
materials, we considered taxonomical changes in the
family Cucumariidae [16, 17, 18, 19]. The method of
material handling was described earlier by Levin
(2003). The type material is preserved in the Paciﬁc
Institute for Bioorganic Chemistry, Far East Division,
Russian Academy of Sciences (Vladivostok).
Nine species of cucumariids from the Sea of
Okhotsk are presently studied, seven of them belong to
the subfamily Cucumariinae:
Theel [4, 6],
Levin et Stepanov ,
Stepanov et Pil’ganchuk ,
Stepanov , and
Levin . Two species
belong to the subfamily Thyonidiinae:
(Levin) [7 and 15 with modiﬁcations] and
Thus, with the three species given here, 12 species
of the family Cucumariidae have presently been docu-
mented; their identiﬁcation characters are presented in
the key below.
Key for the family Cucumariidae from the Sea of
1. Ten tentacles, spicules of the body walls are lam-
inate or bulky bodies, baskets absent (subfamily Cucu-
mariinae Panning) 2.
– Tentacles are over 10 (subfamily Thyonidiinae
Heding et Panning) 11.
2. Spicules of the body walls: only plates. genus
de Blainville 3.
– Spicules of the body walls: bulky rounded bodies
and plates forming them, as well as dichotomically
branched rods with a smooth surface genus
gen. n., species
3. Spicules of the body walls are plates, mostly of
the same type 4.
– Spicules of the body walls are plates, mostly of
several different types 5.
4. Spicules of the body walls: large, thick, and knot-
ted ovate plates, one end protruded and tapering to form
a narrower, often pointed projection, holes on the plates
are often arranged in 2–3 rows either along the plate or
at an angle to its length
– Spicules of the body walls: elongated “spectacles-
shaped” plates, bearing holes on both ends; two ventral
tentacles smaller in size
A Supplement to the Fauna of Holothurians
of the Family Cucumariidae (Echinodermata: Holothuroidea)
from the Sea of Okhotsk
V. S. Levin
Paciﬁc Institute of Bioorganic Chemistry, Far East Division, Russian Academy of Sciences, 690022 Vladivostok, Russia
Received October 28, 2005
—This work studies a new genus
and three new holothurian species:
, found in samplings of the 27th and 29th cruises of the research
to western and southeastern areas of the Okhotsk Sea. The new species distinctly dif-
fers from other known cucumariids in the structure of spicules of the body walls, tentacles, and the circumpha-
ryngeal calcareous ring. Descriptions of the new taxa are presented with diagnoses and ﬁgures.
systematics, new species, Holothuroidea, Dendrochirotida, Cucumariidae,
Cucumaria obscura, C. fusiformis