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

 

KMK

 

 

Volume 5, Number 2

Published online 15/09/2009

V.G. Gagarin

New nematoda species of family Leptosomatidae (Nematoda, Enoplida) from Mediterranean Sea: 8795 

(in Russian with English Summary)

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Institute Inland Waters Biology, Russian Academy of Sciences, Borok, Yaroslavl region, 152742, Russia.

ABSTRACT: Three new species of free-living nematodes of the family Leptosomatidae were found off the Mediterranean Sea coast near Israel. Thoracostoma parvum sp.n. is similar to Th. coronatum (Eberth, 1863) and Th. campbelli Dillevsen, 1921, but differs from them by the shorter body, absence of cervical setae and subventral papillae in precloacal region of males. Deotostoma mediterraneum sp.n. differs from D. zeae Inglis, 1964 by the absence of cervical setae and subventral setae in precloacal region of males, shorter spicules and gubernaculum of copulative apparatus. Synonchus glosus sp.n. is similar to S. fasciculatus Cobb, 1894, but has the longer and thinner body, comparatively shorter cephalic setae and longer spicules.

Key words: Nematoda, Mediterranean Sea, new species.

 

A.E. Zhadan, A.B. Tzetlin

Polychaetes from deep pelagic zone of the Mid-Atlantic ridge: 97109

(in English with Russian Summary)

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1White Sea Biological station, Biological Faculty, Moscow State University, Moscow 119992, Russia.

2Department of Invertebrate Zoology, Biological Faculty, Moscow State University, Moscow 119992, Russia.

ABSTRACT: Polychaetes from bathypelagic zone of the Mid-Atlantic ridge were studied using light and scanning electron microscopy. Descriptions of Yndolacia sp. (Yndolaciidae), Hesionidae gen.sp. larvae, Amphinomidae gen. sp. and Buskiella abyssorum (Flotidae) are given. Yndolacia sp. differs from previously described specimens (Støp-Bowitz, 1987; Buzhinskaja, 2004) by combination of characters such as simple (not ramified) nuchal organ, separated first and second segments, number of segments and chaetae, and relative length of tentacular cirri. Yndolacia sp. has an unusual type of axial proboscis with dorsal part much longer than ventral, with ciliar bundles and glands openings on the inner surface. Phylogenetic position of Yndolaciidae is discussed. Hesionidae gen.sp. larvae show a combination of well developed body with the segments number close to that of adults, larval prostomium with very early appendage rudiments, and well-developed prototroch. This morphology can be considered as an adaptation for prolonged swimming of a relatively large animal. Amphinomidae g. sp. These normally benthic animals were caught in the water column in spite of their adult morphology. They are most similar to Notopygos, but differ by absence of forked chaetae.

KEY WORDS: bathypelagic zone, Mid-Atlantic ridge, Polychaeta, Yndolacia, Hesionidae, Amphinomidae, Buskiella abyssorum.

 

I.A. Jirkov

Revision of Ampharetidae (Polychaeta) with modified thoracic notopodia: 11132

(in English with Russian Summary)

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

ABSTRACT: Ampharetidae comprises about 300 species and 100 genera, more than 50 are monotipic. As a first step towards a revision of the family, all 30 species with modified thoracic notopodia are reviewed. These 27 species had previously been organized into 11 genera, but several more genera need to be established if we follow a traditional approach to taxonomy of family. Based on a critical re-evaluation of 12 characters commonly used in ampharetid taxonomy and traditional weighting of these characters, it is proposed to combine these 30 species into 3 genera: Anobothrus, Zatsepinia and Sosane. A posteriori the following characters are of high value in ampharetid taxonomy: type of prostomium, modification of notopodia, presence/absence of a pair of well developed nephridial papillae behind the branchiae, presence/absence of a circular band on anterior thorax, number of uncinigers with modified notopodia, amount of uncinigers with neuropodia of thoracic type. The following characters are considered of low value for generic distinction among Ampharetidae: type of buccal tentacles, presence/absence of paleae, number of thoracic and abdominal uncinigers, pairs of branchiae, type of branchostyles. The taxonomic part of the paper includes redescriptions of 7 species based on type material and new records. Anobothrus patersoni sp.n., A. mironovi sp.n., and A. nataliae sp.n. are described as new to science. The species descriptions are accompanied by remarks on geographic and bathymetric distribution. The replacement of different species in different geographic areas is shown.

KEY WORDS:  Polychaeta, Ampharetidae, new species.

 

A.N. Mironov

Stalked crinoids of the family Bathycrinidae (Echinodermata) from the eastern Pacific: 133153

(in English with Russian Summary)

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P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovskyi Prospekt 36, Moscow 117997, Russia.

ABSTRACT: Three crinoid species of the family Bathycrinidae have been found in the Eastern Pacific; depths from 4130 to 6240 m. The species Bathycrinus complanathus was known previously only from northwestern Pacific. A new genus and two new species, Discolocrinus thieli gen. et sp.n. and Bathycrinus mendeleevi sp.n., are described. Six types of pinnule structure are distinguished within the living ten-armed crinoids of the order Bourgueticrinida. One of these types is represented in the Discolocrinus only.

KEY WORDS: Discolocrinus, Bathycrinidae, Bourgueticrinida, Crinoidea, East Pacific, deep-sea fauna, comparative morphological analysis.

 

N.P. Sanamyan, K.E. Sanamyan

Shallow water anemones (Cnidaria: Actiniaria) from south-eastern coast of Kamchatka: 155172 

(in Russian with English Summary)

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

Abstract: Study of sea anemones from south-east Kamchatka based on collections of KF TIG, our own collections and long term studies of living specimens in their natural environment significantly increased and corrected a list of Actiniaria species of this region. The paper provides full list of species occurring from intertidal zone to 35 m depth, descriptions and new data on biology and distribution of these species. There are no exclusively intertidal species and all 13 recorded species occur in subtidal, five of which may be present in intertidal zone. Most species are widely distributed in North Pacific; five species are distributed also in arctic seas.

Key words: sea anemone, Kamchatka, Actiniaria.

 

I.P. Shepeleva

Structure and optical properties of the eye of terrestrial gastropod snail Trichia hispida (Linné, 1758) (Pulmonata: Stylommatophora) from South Sweden: 173180

(in Russian with English Summary)

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Department of Cell and Organism Biology, Faculty of Science, University of Lund, Helgonavagen 3, S-22362 Lund, Sweden.

Abstract: Structure and optical properties of the eye of terrestrial gastropod snail Trichia hispida (Linn, 1758) from South Sweden were investigated by light microscopy methods. The structure of T. hispida eye is typical camera eye with fixed optics. Eye structure and optical properties differences were revealed between the specimens T. hispida from South Sweden and the specimens of T. hispida from Kaliningrad District previously studied. The eye of T. hispida from South Sweden is adapted to the vision during daylight and twilight hours, whereas the eye of T. hispida from Kaliningrad District functions as an illumination detector only.

KEY WORDS: gastropod mollusks, Trichia hispida, eye structure, optical properties.

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