ISSN 10630740, Russian Journal of Marine Biology, 2013, Vol. 39, No. 5, pp. 357–362. © Pleiades Publishing, Ltd., 2013.
Original Russian Text © A.V. Rybakov, J.T. Høeg, 2013, published in Biologiya Morya.
Kossmann, 1874 is a rare
and poorly known species of rhizocephalan crusta
ceans that parasitize the burrowing shrimp
(Petagna, 1792) and
(Montagu, 1808) (Callianassidae) in the Mediterra
nean and Black seas, as well as
(Trybom, 1904) (Axiidae) in the Skagerrak Strait of
the Baltic Sea [6, 9]. Until now, the taxonomic posi
tion of the genus
has remained uncertain.
MATERIALS AND METHODS
in the collections of the Zoological Museum of
Copenhagen (Copenhagen, Denmark) and the Berlin
Museum of Natural History (Berlin, Germany).
Fixed nauplii I of
were found in the
collections of the Berlin Museum of Natural History:
“Museum für Naturkunde, Berlin, no. 4 953; Naup
Neapel; Leg. P. Mayer.”
The externae were cleared in lactic acid and exam
ined under a binocular microscope. The larvae that
were selected for electron microscopic study were
dehydrated in a series of increasing concentrations of
alcohol and in acetone and dried in carbon dioxide at
the critical point, mounted on a table and sprayed with
an alloy of platinum and palladium. The preparations
were viewed and photographed under a JSM 6335F
microscope in the Copenhagen Zoological Museum.
Morphology of the externa.
The externa (Fig. 1) is
solitary, round in shape, 12–16 mm in diameter, with
a deep groove along the dorsal side. The fixed speci
mens are yellowish. The live externa, according to the
available descriptions, is pinkishorange; the ripe
externa is dark brown or brownishgray, and the rhiz
oid system, green [4, 11]. The stalk is short and wide.
The mantle opening is circular or slitlike in shape,
located on the surface of the body or somewhat ele
vated, laterally on the right or left side, so that the
plane of symmetry of the externa is perpendicular to
the longitudinal body axis of the host. The dorsal side
of the body is much shorter than the ventral one. The
mesentery is wide, stretched along the dorsal side from
the mantle opening to the base of the stalk (Fig. 2).
The visceral mass forms two symmetrical lateral lobes.
The colleteric glands (glandular oviducts) are rela
tively simple in structure, slightly branched, lie in one
plane and are arranged symmetrically on the hind
(opposite to the stalk) surface of the visceral mass.
Male receptacles are paired, isolated from each other,
symmetrically arranged in the thickness of the visceral
mass, cylindrical, slightly curved and tapering gradu
ally to pass into the ducts. The ducts are thickwalled,
with a relatively narrow lumen, almost straight, open
into the mantle cavity on the ventral side of the body,
near the base of the stalk. The rhizoid system is poorly
developed, formed as a bundle of poorlybranched
ZOOLOGY OF INVERTEBRATES
The Taxonomic Position of Rhizocephalan Crustaceans of the Genus
Kossmann, 1874 (Cirripedia: Rhizocephala)
with Validation of a New Family, Parthenopeidae Fam. Nov
A. V. Rybakov
and J. T. Høeg
Zhirmunsky Institute of Marine Biology, Far East Branch, Russian Academy of Sciences, Vladivostok, 690059 Russia
Institute of Zoology, University of Copenhagen, Copenhagen, 2100 Denmark
Received May 25, 2012
—Data on the external morphology are reviewed and new information is provided about the struc
ture of the first naupliar instar of
Kossmann, a rare and poorly known species of
rhizocephalan barnacles. The taxonomic position of
, which has so far been uncertain, is dis
cussed. A new family, Parthenopeidae fam. nov., is erected to include a single genus,
, with a sin
. The distinctive characters of the new family are described.
, nauplius, larval development, morphology, taxonomy, sys