ISSN 10630740, Russian Journal of Marine Biology, 2014, Vol. 40, No. 2, pp. 88–94. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © V.G. Stepanov, T.B. Morozov, 2014, published in Biologiya Morya.
The order Molpadiida Haeckel, 1896 includes
three families: Caudinidae Heding, 1931, Eupyrgidae
Semper, 1868, and Molpadiidae J. Müller, 1850.
belonging to the family Caudinidae was first reported
by Saveljeva  as
found in the Sea
of Japan (to the south of Cape Peshchurov; in Patrokl
Bay; in an area with coordinates 43
at the entrance to Vladimir Bay) and in coastal waters
of Sakhalin. In addition, this species was found in
Busse Bay (Sakhalin Island), in storm casts at Petrov
Island in Sokolovskaya Bay, in Vladimir Bay, and Peter
the Great Bay (Kitovy Inlet). In the Russianlanguage
literature, it is given under different names:
(von Marenzeller, 1881) and
(von Marenzeller, 1881) [2–6, 9], which are
The second species
Eupyrgus pacificus Ostergren
1905 (family Eupyrgidae) was first found by Saveljeva
 in Peter the Great Bay and in the northern Sea of
Japan. It is also known from Sokolovskaya Bay and
from coastal waters near Antonovo and Kholmsk
(southwestern coast of southern Sakhalin) [2–4].
The third species
zeller, 1877) belongining to the family Molpadiidae
was recorded in the Tatar Strait and in the southern
Sea of Japan. It is given in the Russian literature as
(see [3, 4, 8]).
The fourth species
1933) was described as
is a junior synonym of the genus
[14, 17, 18, 28]) from the Sea of Japan (Peter
the Great Bay; Grossevich Bay; 50
It was also recorded in the Tatar Strait to about 50
[1, 3–5, 7, 8].
Risso, 1826, whose presence in
Russian waters is doubted, was not found by Russian
investigators and was only recorded by Ohshima 
at the eastern coast of southern Sakhalin.
No representative of the order Molpadiida was
recorded in the literature for the shelf of Kamchatka
and the Kurile Islands. We found two species of mol
padiids in this region for the first time:
(off southwestern and northeastern Kam
(off southern Kurile Islands).
MATERIALS AND METHODS
Material was collected during expeditions of the
Zhirmunsky Institute of Marine Biology (IMB) of the
Far East Branch, Russian Academy of Sciences (FEB
RAS), Pacific Institute of Bioorganic Chemistry
(PIBOC), Far East Branch, Russian Academy of Sci
Holothurians of the Genus
from the Shelf of Kamchatka and the Kurile Islands
V. G. Stepanov
and T. B. Morozov
Kamchatka Branch, Pacific Institute of Geography, Far East Branch, Russian Academy of Sciences,
ul. Partizanskaya 6, PetropavlovskKamchatski, 683000 Russia
Kamchatka Research Institute of Fisheries and Oceanography,
Naberezhnaya 18, PetropavlovskKamchatski, 683000 Russia
email: email@example.com, firstname.lastname@example.org
Received September 19, 2013
—Two species of holothurians of the order Molpadiida were found on the shelf of Kamchatka and
the Kurile Islands:
(Saveljeva, 1933) comb. nov. and
(von Marenzeller, 1877).
Molpadiid holothurians were not previously recorded in waters near Kamchatka and the Kurile Islands. Brief
descriptions of the morphology of the two species, distribution and ecology data, as well as figures depicting
calcareous rings and body skin ossicles, are provided.
: Kamchatka, Kurile Islands, holothurians, Holothuroidea, Molpadiida, Molpadiidae,
morphology, distribution, ecology