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INVERTEBRATE ZOOLOGY
ISSN 1812-9250 
ISSN 1814-0815
(online)

 

KMK

 

 

Volume 4, Number 1

 

Redescription of Tegastes nanus Sars, 1904 (Copepoda: Harpacticoida: Tegastidae) from Spitsbergen in the Arctic Ocean

Frank D. Ferrari1, Pavel V. Rybnikov2, Hans-U. Dahms3

1 IZ/MSC; MRC-534, National Museum of Natural History, Smithsonian Institution, 4210 Silver Hill Rd., Suitland, MD 20746, U.S.A.

2 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia

3 National Taiwan Ocean University, Institute of Marine Biology, 2 Pei-Ning Road, KEELUNG, Taiwan, 202

Abstract: Tegastes nanus Sars, 1904 (Copepoda, Harpacticoida, Tegastidae) is reported from Ny Ålesund, Spitsbergen (Svalbård) in the Arctic Ocean. The morphology of adult females and males is redescribed. Specimens from Ny Ålesund are similar to Norwegian specimens collected by Sars from Eggesbønes and Ålesund, as well as to published descriptions of specimens of this species by Chislenko (1967) from the White Sea. Specimens from Ny Ålesund, Eggesbønes and Ålesund differ from published description of the species collected in the Gulf of Maine (McAlice & Coffin, 1990) by the shape of the extension of the genital somite plus 6th thoracic somite of females, the spermatophore reservoir of males, and several limbs. This is the first detailed description of the mouthparts of T. nanus and the first report of a harpacticoid copepod from Spitsbergen.  

(in English with Russian Summary)

Published online in May 25, 2007; printed in July 24, 2007

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Notes ontaxonomy and biology of the symbiotic shrimp Vir euphyllius Marin et Anker, 2005 (Decapoda: Palaemonidae: Pontoniinae), associated with scleractinian corals Euphyllia spp. (Cnidaria: Caryophyllidae)

I.N. Marin

Laboratory of ecology and morphology of marine invertebrates, A.N. Severtzov Institute of ecology and evolution RAS, Leninsky prospect, 33, Moscow, 117071, Russia.

ABSTRACT: Recent collections of numerous specimens of shrimps associated with cariophyllid corals in Nhatrang Bay, Vietnam, add new data to the taxonomy and biology of the pontoniine shrimp Vir euphyllius Marin et Anker, 2005. A comparison of the morphology and coloration of the freshly collected specimens with the type material of V. pareuphyllius Marin et Anker, 2005 and V. euphyllius leads to the conclusion that V. pareuphyllius should be considered as junior synonym of V. euphyllius. A key to the species of the genus Vir Holthuis, 1952 is provided. In Nhatrang Bay, V. euphyllius is exclusively associated with three species of the caryophyllid coral genus Euphyllia Dana, 1846. The shrimps appear to live in heterosexual pairs and are possibly territorial and aggressive towards conspecifics.

(in English with Russian Summary)

Published online in May 25, 2007; printed in July 24, 2007

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Occurence of the Australian cladoceran Armatalona macrocopa (Sars, 1894) (Cladocera: Anomopoda: Chydoridae) in Thailand

Artem Yu. Sinev1, Sawitri Nachai2 and La-orsri Sanoamuang2

1 Department of Invertebrate Zoology, Biological Faculty, Moscow State University, Vorob’evy Gory, Moscow 119992 Russia.

2 Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.

ABSTRACT: A chydorid cladoceran, Armatalona macrocopa (Sars, 1894) known from Australia and New Zealand, was found in North-East Thailand. This is a new record for Thailand and for the Asian fauna. Morphology of the specimens from Thailand and distribution of the genus Armatalona Sinev, 2004 are discussed.

(in English with Russian Summary)

Published online in May 25, 2007; printed in July 24, 2007

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Redescription of Remaneicaris ignotus (Dussart, 1983), a Parastenocarididae (Copepoda: Harpacticoida) with an unusual set of plesiomorphic characters

Paulo Henrique Costa Corgosinho1, Pedro Martinez Arbizu2, Edinaldo Nelson dos Santos-Silva3

1 Plankton Laboratory, CPBA/ INPA, Av. André Araújo, 2936 Petrópolis, CP 478, 69011-970, Manaus-AM, Brazil.

2 DZMB — Forschungsinstitut Senckenberg, Südstrand 44, 26382 Wilhelmshaven, Germany.

3 Plankton Laboratory, CPBA/ INPA, Av. André Araújo, 2936 Petrópolis, CP 478, 69011-970, Manaus-AM, Brazil.

Abstract: In the course of a phylogenetical analysis of the family Parastenocarididae we re-describe here both sexes of Remaneicaris ignotus (Dussart, 1983) and its phylogenetic position within the genus Remaneicaris is briefly discussed. This species can be distinguished from the other species of the genus by the following autapomorphies: absence of an outer seta on the basis of the leg 1 in both sexes; presence of a very sclerotized body of uneven cuticle; presence of a less sclerotized plate between the fifth legs that is not homologous to an intercoxal plate, and presence of an irregularly-shaped endopod of leg 4 in males, which is hirsute on the proximal outer margin and with a distal hyaline seta. This species also can be easily identified by the presence of several unusual plesiomorphic characters, unknown so far from any other member of the genus, such as a dorsal integumental window on all urosomites, an inner seta on the basis of leg 1 in males and females, the ventral position of leg 5 and the linear distribution of the proximal outer row of spinules on exopodite 1 of legs 2 and 4. 

(in English with Russian Summary)

Published online in May 25, 2007; printed in July 24, 2007

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The growth of endemic Baikalian snail Maackia herderiana (Lindholm, 1909) (Caenogastropoda: Baicaliidae)

N.V. Maximova, T.Ya. Sitnikova, I.B. Mizandrontsev

Limnological Institute SB RAS, Ulan-Batorskaya 3, Irkutsk 664033, Russia.

ABSTRACT: The characteristics of growth as estimated with shell size and body mass changes in endemic Baikalian snail Maackia herderiana (Caenogastropoda: Baicaliidae) have been studied. It was shown that the snails grow during all their life. The growth rate of shell is not constant and depends on season and age. Body mass of the snail changes according to an equation: dM/dt = á(t)·M, where coefficient α depends on time t. Compared to other freshwater mollusks, the initial stage of mass growth in M. herderiana is much longer and takes up to half of the life span. The specific growth rate is the highest during the initial stages of development, with absolute growth rate higher during the maturation period. During the period of fast shell growth, increase in body mass is slow, but becomes rapid following the cessation of fast shell growth. The relative weight of soft body parts increases significantly with age: from 4% of the total weight in newly-hatched spat to about 30% in mature snails, which is approximately twice as low as in other palaearctic mollusks. During the first three years of life, shell length increases faster then width. Coefficients of allometric equation are not constant and with variable rates of increase in shell height and body mass.

(in Russian with English Summary)

Published online in May 25, 2007; printed in July 24, 2007

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Revision of Buskiella McIntosh, 1885 (including Flota Hartman, 1967), and description of its trifid organ (Polychaeta: Flotidae)

S.I. Salazar-Vallejo1,2, A.E. Zhadan3

 1 Departamento de Ecología Acuática, El Colegio de la Frontera Sur (ECOSUR), Chetumal, México

2 Visiting Curator, Natural History Museum of Los Angeles County, Los Angeles, California, U.S.A.

3 White Sea Biological Station, Faculty of Biology, Moscow State University, Russia.

ABSTRACT: The species included in both Buskiella McIntosh, 1885, and Flota Hartman, 1967 are revised on the basis of type and non-type materials, as well as on published accounts. Both genera are synonyms and the former has priority; the species included are B. abyssorum McIntosh, 1885, B. flabelligera (Hartman, 1967) comb.n., and B. vitjasi (Buzhinskaya, 1977) comb.n. Two other species previously included in the genus (B. borealis Hartman, 1965 and B. minuta Amoureux, 1986) are non-pelagic flabelligerids belonging elsewhere. The three Buskiella species are re-described, and an identification key is included. Further, the trifid organ is being described in details for the first time; this unique organ is neither a palp nor a branchial radiole. A similar structure has been reported in Paralvinella Desbruyères & Laubier, 1982. The independent status of Flotidae has been challenged, but its oligomery (body with few segments), trifid organ, and nervous system are unique, so this status deserves to be retained.

(in English with Russian Summary)

Published online in May 25, 2007; printed in July 24, 2007

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Deep-water Actiniaria from East Pacific hydrothermal vents and cold seeps 

N.P. Sanamyan, K.E. Sanamyan

Kamchatka Branch of the Pacific Institute of Geography FEB RAS, Partizanskaya 6, Petropavlovsk-Kamchatsky 683000, Russia.

ABSTRACT: Four species of sea anemones from East Pacific hydrothermal vents and one species from cold seeps are discussed. A species from cold seeps, Seepactis galkini gen. nov., sp. nov, possesses acontia and belongs to Kadosactiidae. Previously the specimens of this species were preliminarily referred to the ultraabyssal actinostolid Hadalanthus knudseni. Cyananthea hydrothermala, an obligate hydrothermal species and genus known previously only from an incomplete damaged specimen is redescribed and tentatively assigned to the Actinoscyphiidae. Cyananthea is closely related to several monotypic genera described recently from hydrothermal vents, especially to Pacmanactis and Marianactis which were assigned to the Actinostolidae by their authors. In our opinion these genera should be removed from the Actinostolidae and placed in the same family as Cyananthea. Three other recorded species belong to the Hormathiidae: Phelliactis hydrothermala sp.n., Phelliactis callicyclus and Paraphelliactis pabista.

(in English with Russian Summary)

Published online in August 07, 2007; printed in July 24, 2007

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