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

 

KMK

 

 

Volume 6, Number 1

Published online 02/12/2009

 

Wan-Xi Yang 1*Ü, Hans-Uwe Dahms 2*, Iskandar Mirabdullayev 2

 MIP-like substance in the brain of Perinereis nuntia Savigny, 1818  (Polychaeta, Annelida) detected by immunocytochemistry: 1-12

1 The Sperm Laboratory, Institute of Cell Biology and Genetics, College of Life Sciences, Zhejiang University, Hangzhou 310058, China.

2 Green Life Science Department, Sangmyung University, Seoul 110-743 South Korea.

3 Institute of Zoology, Tashkent 700095, Uzbekistan.

ABSTRACT: Molluscan insulin-like peptides (MIPs) were first identified from the cerebral ganglion of a freshwater pulmonate, the snail Lymnaea stagnalis. Recently, MIPs received considerable attention due to their molecular similarity to insulins of higher taxa including humans. It has been suggested that MIPs play an important role in the growth and cell differentiation of peripheral organs of mollusks. The striking similarity between the embryology of mollusks and polychaetes has long been recognized and supports the view that polychaetes and mollusks are evolutionarily related. In this study, we used polyclonal antibodies against the MIP1C-chain of  L. stagnalis to detect the MIP immunoreactive cells in the brain of the locally common polychaete Perinereis nuntia. MIP immunoreactive cells were detected in the P. nuntia brain by confocal and epifluorescent microscopy. These cells were located in the periphery and posterior regions of the brain but not in the anterior region. The cells varied from 10 to 20 Ķm in diameter. Electron microscopic studies of ultra-thin sections of the P. nuntia brain, labeled by an immuno-gold secondary antibody, confirmed the presence of MIP-immunoreactive neurons in the brain. MIP-immunoreactive secretory granules were found in axon terminals, which co-existed with synaptic vesicles in the neuropile of the brain. The potential functions of MIP-like substances in polychaetes are discussed.

KEY WORDS: immunocytochemistry, molluscan insulin-like peptides, MIP immunoreactive cells, neurotransmitters.

(in English with Russian Summary)

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V.G. Gagarin 

Two species of free-living nematodes of order Enoplida from Mediterranean Sea: 13-20 

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

ABSTRACT: New species of free-living nematodes Thalassoalaimus lissus sp.n. and Pelagonema obtusicauda Filipjev, 1918, male of with described fragmentary, incompletely were found off Mediterranean Sea cost near Israel. Thalassoalaimus lissus sp.n. similar to Th. mediterraneus Vitiello, 1970 and Th. septentrionalis Filipjev, 1927, but differ from them by the presence of hypodermal glands, more front location of vulva, comparatively shorter oesophagus, longer spicules and another positions of precloacal supplemental papillae. Illustrated descriptions of males and females Pelagonema obtusicaudata are given.

KEY WORDS: Nematoda, Mediterranean Sea, new species.

(in Russian with English Summary)

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I.V. Mekhanikova

 Morphology of Gammarus dabanus Tachteew et Mekhanikova, 2000 (Crustacea, Amphipoda, Gammaridea) from mountain streams of the Khamar-Daban Ridge (Zabaikalye): 21-31

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

ABSTRACT: Morphology of a recently described species Gammarus dabanus Tachteew et Mekhanikova, 2000 inhabiting mountain streams of the Khamar-Daban Ridge (South Zabaikalye) has been analyzed in detail. Data on studies of the typical material from two habitats add some new details to the first description of the species. G. dabanus (family Gammaridae) belongs to the Gammarus pulex-group consisting of freshwater species of the genus Gammarus and characterizing by the following morphological peculiarities: the absence of dorsal carina on metasome segments and the presence of dense setation on pereiopods 3 and 4 and uropod 3. G. dabanus is similar to Gammarus turanus subnivalis Martynov, 1935 from mountain streams of Central Asia in a number of morphological characteristics and small body size. This similarity is of a convergent nature. 

KEYWORDS: systematics, morphology, Southern Zabaikalye, Gammarus, Gammaridea, Amphipoda, Crustacea.

(in Russian with English Summary)

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 N.A. Pospekhova

Rostellar sac gland in Cloacotaenia megalops (Cestoda: Hymenolepididae): 33-46

Institute of the Biological Problems of the North of FEB RAS, Portovaya St.,18, Magadan, 685000, Russia.

ABSTRACT: The morphology of the rostellar sac gland in juvenile (from a thin intestine of pintail) and adult (attached to a cloaca wall) cestodes Cloacotaenia megalops (Nitzsch in Creplin, 1829) is studied for the first time. Fixation of the adult parasites to a cloaca wall is carried out by means of powerful suckers; the apical pit, a homologue of rostellum, is a place for secret release from gland. It represents the group of specialized tegumentary cytons, borrowing most part of rostellar sacís volume and limited by its muscular wall. Alongside with typical discoid bodies, the glandular cytones of juvenile cestodes produce large (up to 1,2 microns), round, dense granules. Glands of adult, attached to a cloaca wall, cestodes, produce erithroid granules with diameter about 350 nm. Prominent feature of rostellar sac gland at this stage is presence of intranuclear inclusions: a stuff with fibrillar material. The glandular secret in juvenile and adult cestodes is released via the distal cytoplasm of apical pit into their lumen by apocrine means. Possible functional significance of intranuclear inclusions and a secret of rostellar sac gland secretion at different stages of cestode life cycle are discussed.

KEY WORDS: Cestoda, tegument, rostellar gland, ultrastructure.

(in Russian with English Summary)

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E.N. Temereva

New data on distribution, morphology and taxonomy of phoronid larvae (Lophophorata: Phoronida): 47-64

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

ABSTRACT: Phoronids have worldwide distribution and are found in almost all seas of the World Ocean. Frequently phoronid larvae (actinotrochs) comprise a significant proportion of the total zooplankton biomass that makes their studies a very important source of information for ecologists, planktonologists, and zoologists. Investigations of phoronid larvae are interesting due to their relation to affiliation of this phylum and other main groups of Bilateria. Identification of all species and stages is difficult due to the paucity of published information regarding phoronid larvae. The descriptions of morphology and microscopic anatomy of actinotrochs found in Mediterranean and Black seas, Sea of Okhotsk, Sea of Japan, close to Reunion Island and in the Puget Sound are given. For the first time, the larvae that presumably belong to Phoronopsis albomaculata and P. californica are described. The morphological and behavioral features of two main types of actinotrochs are formulated. A complete key for identification of all actinotrochs known by now is developed. 

KEY WORDS: Phoronida, larvae, actinotrocha, morphology, identification key.

(in English with Russian Summary)

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 V.V. Khalaman, L.P. Flyachinskaya, P.A. Lezin

Impact of excretory-secretory products of some fouling organisms on settling of musselís larvae (Mytilus edulis L., Bivalvia, Mollusca): 65-72

The White Sea Biological Station of Zoological Institute RAS, Universitetskaya nab., 1, S.-Petersburg, 199034 Russia.

ABSTRACT: Complexity of succession of fouling communities in the White Sea induce to search some mechanisms that can be important in formation and recruitment of mussel fouling community as blue mussel is the object of cultivation. The impact of excretory-secretory products (ESP) of some fouling organisms (Halichondria panicea, Hiatella arctica, Molgula citrina, Mytilus edulis, Styela rustica) on settling of musselís larvae Mytilus edulis L. was estimated by means of laboratory experiments. Chemical cues of all tested animals accelerate the settling of larvae. The effect of ESP increases in following order: Hiatella arctica < Styela rustica £  Molgula citrina < Mytilus edulis < Halichondria panicea. ESP of sponge Halichondria panicea sharply stimulate settling, but conduce most part of larvae to death. Under the influence of chemical cues of adult conspecific animals most part of just settled musselís juveniles goes to float again.

KEY WORDS: fouling community, Mytilus edulis, Halichondria panicea, Hiatella arctica, Molgula citrina, Styela rustica, chemically-mediated interactions, larvae, settlement, the White Sea.

(in Russian with English Summary)

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A.V. Tchesunov

To the 70-th anniversary of Vladimir Grigorevich Gagarin: 73Ė75

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

(in Russian)

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