1063-0740/05/3103- © 2005 Pleiades Publishing, Inc.
Russian Journal of Marine Biology, Vol. 31, No. 3, 2005, pp. 187–191.
Original Russian Text Copyright © 2005 by Biologiya Morya, Selina, Morozova.
Ten species of the genus
known to produce neurotoxins. Transmitted through the
food chain and swallowed with food, they may cause
neuroparalytic poisoning in humans and warm-blooded
animals . The genus comprises 29 valid [7, 16, 17]
and several presumptive (preliminarily described) spe-
cies [7, 21].
During the last 20 years, ﬁve
have been found in the coastal zone of the seas of the
Russian Far East,
(Paulsen) Balech et Tangen,
(Whedon and Kofoid) Balech,
(Biecheler) Horiguchi ex Yuki et
Fukuyo [1–5]. Another three species—
(Whedon et Kofoid) Balech,
(Inoue et Fukuyo) Balech—were
reported for the Japan coastal zones of the Sea of Japan
and the Sea of Okhotsk .
This paper deals with two
for Russian seas—
Montresor, Beran et John. The species were detected in
the course of plankton monitoring in Peter the Great
Bay (Sea of Japan) and off Sakhalin Island (Sea of
MATERIALS AND METHODS
The material was collected during spring–autumn
bathometric phytoplankton samplings in Minonosok
Bight (southwestern part of Peter the Great Bay) in
1997 and 1999 and net phytoplankton samplings in
Sakhalinskii and Aniva bays (Sea of Okhotsk) in
August 2001 and June and August 2002, respectively.
The samples were ﬁxed with Lugol solution and were
studied using light and luminescence microscopy.
Light microscopy observations of the thecae were per-
formed as described by Konovalova [1, 3]. For lumines-
cence microscopy, microalgae cells were stained with
Calcoﬂuor White M2R following the method of Fritz
and Triemer . Thecal plates were referred to follow-
ing Balech’s classiﬁcation .
RESULTS AND DISCUSSION
Balech, 1994 (Figs. 1a–1h,
Balech, 1994: 22, Fig. 12–15; Balech, 1995: 78,
pl. XVI, Fig. 19–32. – Alexandrium sp., Hallegraeff
1991: 580, Fig. 10–16.
Solitary, relatively small ﬂattened, rounded-pentag-
onal, or wide lens-shaped cells, 20–30
m long and 20–
m wide, with a length-to-width ratio of 0.81–1.0.
As distinct from other
species, the cingu-
lum displacement is negligible (half the cingulum
width). The main distinctive feature of the species is the
shape and position of the ﬁrst apical plate (1'). This
plate is trapezoidal with a convex or convex–concave
anterior edge and a small pore in the left angle in the
suture between plates 1' and 4' (Figs. 1c–1e, 2b, 2d, 2e).
The ﬁrst apical plate is situated immediately under
plate 4' and does not contact the pore (Po) and second
apical (2') plates (Figs. 1c, 2b). The posterior sulcal
Montresor, Beran et John, 2004
in the Seas of the Russian Far East
M. S. Selina and T. V. Morozova
Institute of Marine Biology, Far East Division, Russian Academy of Sciences,
Vladivostok, 690041 Russia
Received November 27, 2004
—New records of two
species are reported for the Russian seas.
found in Peter the Great Bay (Sea of Japan), and
Montresor, Beran et John was found in Aniva and
Sakhalinskii bays (Sea of Okhotsk). Both species were observed in summer in small numbers at water tempera-
tures of 22–24
C and 8.6–11
C, respectively. Data on the morphology and distribution of the species is provided.
, morphology, distribution, Sea of
Japan, Sea of Okhotsk.