ISSN 10630740, Russian Journal of Marine Biology, 2011, Vol. 37, No. 1, pp. 76–79. © Pleiades Publishing, Ltd., 2011.
Original Russian Text © A.P. Kassatkina, E.N. Selivanova, 2011, published in Biologiya Morya.
Kassatkina, 1973 was found
for the first time in plankton samples collected in 1967
in Peter the Great Bay of the Sea of Japan. In all,
16 new species of the genus
 have been
described for Peter the Great Bay and adjacent water
areas. In this work the keys are given to determine the
species of genus.
Holotypes and paratypes were deposited in Pacific
Oceanological Institute of the FEB RAS (Vladivos
tok). The samples were collected in Vityaz Bay
E) on September 21, 2006, at a
depth of 13–0 m and a water temperature of 19–18
(from the surface to the nearbottom layer). The total
catch was performed with the use of a Juday net (with
an opening 37 cm in diameter). The collector was
E.N. Selivanova. In earlier collections of plankton in
Peter the Great Bay, the new species were represented
by very young specimens (at the first stage of maturity)
that were not valid for description.
The arrow worms were measured without the free
plate of the tail fin by the generally accepted method
. The tail portion was measured from the spermath
eca to the terminal end of the body. The method for
staining of the ciliary loop and the fins was presented
et Selivanova sp. n. (Fig. 1)
Reference no. LP12/1.
Ten specimens were found in the same
sample with the holotype.
Short and few rays in all the fins. The
margins, anterior and posterior parts of the lateral fins
and the tail fin are unrayed. Seminal vesicles do not
contact both the lateral fins and the tail fin, but are
remote from the tail fin at a greater distance. The gap
between the vetral ganglion and the fins of the first pair
is 3.5 times shorter than the ganglion length. The alve
olar tissue is present only around the neck, slightly
extending onto the trunk.
of the holotype.
The body is lightcol
ored, transparent, but rigid, not sagging from contact
with the tweezers. The head is slightly wider than the
trunk, there is no constriction at the level of the sper
matheca. The specimen is at the late fourth–early fifth
stage of maturity; the eggs are large.
Body length is 6.95 mm. The tail portion consti
tutes 28.8% of the body length. The ventral ganglion is
relatively large for a mature specimen of this genus and
equals 10% of the body length. Intestinal diverticula
are absent. The trunk gut is not vacuolated; slightly
flattened dorsoventrally, its width is nearly equal to the
pharynx width. The cilary loop is long; beginning con
siderably behind the eye level, somewhat above the
neck; it constitutes about 10% of the body length. The
loop has one pair of weakly pronounced median pro
tuberances. The anterior end of the fins of the first pair
begins behind the level of the posterior end of the ven
tral ganglion at a distance that is 3.5 times shorter than
the ganglion. The fins of the first pair are 1.4 times
shorter than the fins of the second pair; their length is
equal to about 18% of the body length. The gap
between the second and the first pairs of the fins con
stitutes only about 8% of the body length; it is nearly
3 times greater than the distance between the ventral
ganglion and the first pair of fins. The length of the fins
of the second pair constitutes 25.2% of the body
length; their trunk portion is 1.5 times shorter than the
tail part. The tail portion of the fins of the second pair
measures more than half of the tail portion (52.5% of
the length of the tail). The tail fin is rounded; its length
constitutes 5.8% of the total length and about 20% of
Two New Species of
(Chaetognatha) from Vityaz Bay
(Peter the Great Bay in the Sea of Japan)
A. P. Kassatkina
and E. N. Selivanova
Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences, Vladivostok, 690041 Russia
Far Eastern State University, Vladivostok, 690950 Russia
email: email@example.com; firstname.lastname@example.org
Received May 20, 2010
—New species of
sp. n. and
sp. n.) from Vityaz Bay (Peter the
Great Bay, Sea of Japan) are described and shown in figures.
, Sea of Japan, new species.