1063-0740/05/3101- © 2005 Pleiades Publishing, Inc.
Russian Journal of Marine Biology, Vol. 31, No. 1, 2005, pp. 55–59.
Original Russian Text Copyright © 2005 by Biologiya Morya, Kornienko.
The crabs of the family Porcellanidae primarily
inhabit tropical waters. In the Russian waters of the Sea
of Japan, in particular, in Vostok Bay (Peter the Great
Bay), this family is represented by a single species,
Stimpson, 1858 [1, 2]. A rather
detailed description of the larval development is avail-
able for this species including two stages of zoea and
the stage of glaucothoe . However, the earliest free
swimming larval stage, the prezoea, has been described
neither in this nor in other species of the genus
; the respective authors have only mentioned the
fact of the existence of such a stage. The goal of this
study was to investigate the morphological features of
and to compare the latter with
those in other species of the family Porcellanidae.
MATERIALS AND METHODS
Adults females of
eggs on the abdomen were collected in August 2003 at
the Vostok Marine Biological Station of the Institute of
Marine Biology, Far East Division, Russian Academy
of Sciences, located in Vostok Bay (Peter the Great Bay,
Sea of Japan). Until the hatching of larvae the crabs
were maintained in 10 l aquaria with seawater (18–
C). The water was aerated and changed every day.
Immediately after hatching from the egg envelopes,
some larvae were ﬁxed with 4% formaldehyde solution.
No less than 10 specimens of prezoea were used for
description and measurements. During the measure-
ments and description of morphological structures in
the larvae, we followed the techniques published else-
where [5, 12]. In prezoea we measured the length of the
carapace between the base of the rostral spine and the
posterior edge of the carapace (CL) and the maximum
width of the carapace (CW). The outlines of larvae and
their appendages were drawn using an
(Fig. 1a). CL = 0.68
0.03 mm; CW =
0.06 mm. Carapace is smooth, dorsal spine is
absent; rostral spine is underdeveloped, extends beyond
the edge of carapace for about 1/2 of the length of the
spine, directed downward and closely applied against
the ventral surface. The second part of the rostral spine
is sunken within the body of the larva behind the eye
under carapace and makes up two small loops (Fig. 1b).
Posterolateral spines are somewhat curved and directed
sideward and downward. Proximal parts of rostral and
posterolateral spines contain yellow pigment. Eyes are
sessile. Carapace and lateral spines are covered from
above with embryonic cuticle.
(Fig. 1c). Antennule is uniramous,
unsegmented. Embryonic cuticle makes up six hollow
setae. Three of the latter, looking like smooth hoods,
are located above developing terminal aesthetasks. The
remaining three are longer, their surface is covered with
small setae of the second order, inside two of them ter-
minal plumose setae are visible characteristic of anten-
nules in zoea of porcelain crabs.
(Fig. 1d). Antenna is biramous, exopod is
longer than the endopod and covered with embryonic
cuticle that makes up seven hollow setae. One of the
setae (the terminal one) is smooth and looks like a hood
covering the tip of the developing exopod. Subterminal
setae are longer and plumose. The bases of four of the
latter are located above four subterminal teeth of exo-
pod. Endopod is 1/3 as long as the endopod, at the top
Morphology of Prezoea in the Porcelain Crab
(Decapoda: Anomura: Porcellanidae)
Reared under Laboratory Conditions
E. S. Kornienko
Institute of Marine Biology, Far East Division, Russian Academy of Sciences,
Vladivostok, 690041 Russia
Received June 11, 2004
Stimpson, 1858 is the only species of the family Porcellanidae (Decapoda,
Anomura) living in the Russian waters of the Sea of Japan. The morphology of prezoeal larval stages of this
crab obtained under laboratory conditions for the ﬁrst time was studied and described in detail.
prezoea, larval development,
, Decapoda, Porcellanidae.