Volume 10, Number 2

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Two new shallow water sea anemones of the family Actiniidae (Cnidaria: Anthozoa: Actiniaria) from British Columbia (NE Pacific) 199–216

N.P. Sanamyan 1, K.E. Sanamyan 1, N. McDaniel 2

1 Kamchatka Branch of Pacific Geographical Institute, Far-Eastern Branch of the Russian Academy of Sciences, Partizanskaya Str. 6, 683000 Petropavlovsk-Kamchatsky, Russia.
2 Neil McDaniel, Vancouver, British Columbia, Canada.


ABSTRACT: Urticina clandestina sp.n. and Aulactinia vancouverensis sp.n. (family Actiniidae) are recorded from British Columbia, Canada. Urticina clandestina sp.n. is unique in possessing gonads on all mesenteries of first cycles and thus attaining intermediate position between Urticina and Cribrinopsis. Aulactinia vancouverensis sp.n. is a medium-sized rose-coloured species abundant near the northern end of Vancouver Island, but not widespread in southern British Columbia waters. It posses holotrichs in the column; their occurrence in related species is discussed.
How to cite this article: Sanamyan N.P., Sanamyan K.E., McDaniel N. 2013. Two new shallow water sea anemones of the family Actiniidae (Cnidaria: Anthozoa: Actiniaria) from British Columbia (NE Pacific) // Invert. Zool. Vol.10. No.2. P.199–216.

KEY WORDS: Sea anemones, Northeast Pacific, Actiniidae, Cnidaria, Anthozoa, Actiniaria, Urticina clandestina, Aulactinia vancouverensis.

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Identification keys for Terebellomorpha (Polychaeta) of the eastern Atlantic and the North Polar Basin

I.A. Jirkov, M.K. Leontovich

Department of Hydrobiology, Moscow Lomonosov State University, 119899, Moscow, Russia.

ABSTRACT. New user-friendly identification keys for 117 species of Pectinariidae, Ampharetidae, and Terebellidae from the eastern Atlantic and the North Polar Basin are presented. A new species Auchenoplax worsfoldi sp.n. is described. Three names Amphitrite affinis, Pista malmgreni, and Terebellides irinae are proposed as junior synonyms to other species.
How to cite this article: Jirkov I.A., Leontovich M.K. 2013. Identification keys for Tere¬bellomorpha (Polychaeta) of the eastern Atlantic and the North Polar Basin // Invert. Zool. Vol.10. No.2. P.217–243.

KEY WORDS: identification key, Polychaeta, Pectinariidae, Ampharetidae, Terebellidae, Eastern Atlantic, North Polar Basin.

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Metameric structures in the subepidermal nervous system of the nemerteans with review of the metamerism in Nemertea

A.V. Chernyshev 1, 2, T.Yu. Magarlamov 1

1 A.V. Zhirmunsky Institute of Marine Biology FEB RAS, Vladivostok, 690059 Russia.
2 Far Eastern Federal University, Vladivostok, 690600 Russia.

ABSTRACT: The subepidermal nervous system of five nemertean species (Tubulanus sp., Hubrechtella juliae, Cephalothrix simula, Quasitetrastemma stimpsoni, and Ototyphlonemertes martynovi) was studied using antibodies against serotonin (5-HT) and catecholamines (for H. juliae only) together with confocal laser scanning microscopy. Tubulanus sp. and H. juliae have closely situated transverse (semicircular) nerves connecting the dorsal nerve and/or the lateral nerve cords. Two kinds of metameric structures are found in the subepidermal nervous system of C. simula: closely situated transverse nerves and well-developed ring nerves spaced 380–750 ?m apart. Closely situated transverse subepidermal nerves connect two subdorsal and two subventral longitudinal nerves in Q. stimpsoni and O. martynovi. Juvenile specimens of Q. stimpsoni (four days after hatching) lack both transverse and longitudinal subepidermal nerves. The examples of metamerism in nemertean morphology are discussed. The metameric ring nerves and rhynchocoel septa of cephalotrichid nemerteans are of chief interest, but further investigations of both structures are necessary for correct evolutionary interpretations.
How to cite this article: Chernyshev A.V., Magarlamov T.Yu. 2013. Metameric structures in the subepidermal nervous system of the nemerteans with review of the metamerism in Nemertea // Invert. Zool. Vol.10. No.2. P.245–254.

KEY WORDS: Cephalothrix, metamerism, nemerteans, ring nerves, rhynchocoel septa, sudepidermal nervous system.

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New data on trematodes (Plathelminthes, Trematoda) of fishes in the Ross Sea (Antarctic)

S.G. Sokolov 1, I.I. Gordeev 2

1 The Center of Parasitology IPEE RAS, Leninskyi Prospect. 33, Moscow 119071 Russia. e-mail: sokolovsg@mail.ru
2 Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), Verhnaya Krasnoselskaya Str. 17, Moscow 107140 Russia.

ABSTRACT: Records of 13 trematode species, collected from bottom fishes from the western and northern parts of the Ross Sea, are given. Trematodes Otodistomum cestoides van Beneden, 1871, Lecithaster micropsi Zdzitowiecki, 1992, Neolepidapedon trematomi Prudhoe et Bray, 1973, Postlepidapedon opisthobifurcatum (Zdzitowiecki, 1990), Discoverytrema gibsoni Zdzitowiecki, 1990, D. markowskii Gibson, 1976, Macvicaria muraenolepidis Zdzitowiecki, 1990, Helicometra rakusai Zdzitowiecki, 1997 and Proctophantastes sp. are recorded from the Ross Sea for the first time. Proctophantastes sp. differs from other species of Proctophantastes Odhner, 1911 by the morphology of the ventral equatorial ridge of the ventral sucker.
How to cite this article: Sokolov S.G., Gordeev I.I. 2013. New data on trematodes (Plathelminthes, Trematoda) of fishes in the Ross Sea (Antarctic) // Invert. Zool. Vol.10. No.2. P.255–267.

KEY WORDS: the Ross Sea, Antarctic, trematodes, Nototheniidae, Rajidae, Channichthyidae, Macrouridae, Muraenolepididae, Zoogonidae, Proctophantastes.

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Notes on Pleuroxus (Picripleuroxus) quasidenticulatus (Smirnov, 1996) (Cladocera: Anomopoda: Chydoridae) from South-East Asia and the East of Russia

Artem Yu. Sinev 1, La-orsri Sanoamuang 2

1 Department of Invertebrate Zoology, Biological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia. 
2 Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.  .th

ABSTRACT: The morphology of the Australasian Pleuroxus (Picripleuroxus) quasidenticulatus (Smirnov, 1996) (Cladocera: Anomopoda: Chydoridae) was studied, using material from Thailand, Vietnam and the Far East of Russia. The morphology of the thoracic limbs and the detailed morphology of males were studied for the first time. The taxonomic position, relationship and distribution of the species are discussed. The species is recorded for Russia for the first time and this is one of the few tropical cladoceran species penetrating this far North.
How to cite this article: Sinev A.Yu., Sanoamuang L. 2013. Notes on Pleuroxus (Picripleuroxus) quasidenticulatus (Smirnov, 1996) (Cladocera: Anomopoda: Chydoridae) from South-East Asia and the East of Russia // Invert. Zool. Vol.10. No.2. P.269–280.

KEY WORDS: Cladocera, Pleuroxus, morphology, systematics, distribution, East Asia.

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On the homology of the frontal head pore in Cladocera (Crustacea: Branchiopoda)

Alexey A. Kotov

A.N. Severtsov Institute of Ecology and Evolution, Leninsky Prospect 33, Moscow 119071, Russia.

ABSTRACT: A frontal head pore is found in all representatives of the order Anomopoda (Cladocera) except for three genera: Daphnia O.F. Mьller, 1785 (Daphniidae), Moinodaphnia Herrick, 1884 and Moina Baird, 1850 (Moinidae). It is also found in a representative of the order Onychopoda in the genus Polyphemus O.F. Mьller, 1785. Earlier, this structure was detected in a few representatives of the orders Ctenopoda (Penilia Dana, 1852) and Haplopoda (Leptodora Lilljeborg, 1861). The presence of such a pore is a plesiomorphy of the Cladocera. The frontal head pore in the Cladocera and the Cyclestherida (Cladoceromorpha) is homologous to a pore in “Conchostraca” and Notostraca, which is the opening of a duct connecting the eye chamber with the environment, although its connection with the eye capsule in the Cladocera is not confirmed. The function of this pore is unknown, however a duct running into the head from the former, in the cladocerans and “conchostracans” obviously involves the ocellus and the frontal organ. Though poorly studied, the latter has a sensory function, which could suggest a participation of the frontal head pore in these functions.
How to cite this article: Kotov A.A. 2013. On the homology of the frontal head pore in Cladocera (Crustacea: Branchiopoda) // Invert. Zool. Vol.10. No.2. P.281–290.
 

KEY WORDS: Cladocera, Cladoceromorpha, functional morphology, morphological evolution, homology, frontal head pore.

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