The Yuriyagai: J. Malacozool. Ass. Yamaguchi, 8(2). August 2002

Original Articles

Spermatophore and external morphology of Parthenina affectuosa (Yokoyama, 1927) (Gastropoda: Heterobranchia: Pyramidellidae)

Shigeo HORI and Reiko KURODA

Abstract The external morphology of the northwestern Pacific pyramidellid Parthenina affectuosa (Yokoyama, 1927) is here described. The spermatophores of this species are examined for the first time, which were mostly found attached around the periphery posterior to the aperture of the shell. They are oblong in shape with a tapering tube that resembles the previously reported spermatophores of Parthenina obtusa (Brown, 1827), Fargoa spp. and Iolaea scitula (A. Adams, 1860); however, they are distinctive in that their distal portion is twisted in a form of a screw.

Key words: Pyramidellidae, Parthenina affectuosa, external morphology, spermatophore

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Soletellina (Soletellina) petalina (Bivalvia: Psammobiidae) from the Japan Sea coast of Kyûshû, Japan

Hiroshi FUKUDA and Richard C. WILLAN

Abstract Many freshly dead, still articulated shells of Soletellina (Soletellina) petalina (Deshayes, 1855) were collected in April 2002 from the sandy tidal-flat at Nagaura, Sasebo City, Nagasaki Prefecture, western Kyûshû, Japan. This is the first record of this species in the Japan Sea and only the second authentic report of it from Japan. There are no confirmed reports of it in Japan prior to 1990, suggesting a recent (natural) expansion of range into Japanese waters, possibly as the result of global warming. The population presently in Nagaura might still be insecure because no live individual has been found to date in spite of an abundance of fresh empty shells.

Key words: Soletellina (Soletellina) petalina, distribution, new record, sandy tidal-flat, Japan Sea, warm currents, global warming, Sasebo, Nagasaki Prefecture

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Invasion of two marine alien gastropods Stenothyra sp. and Nassarius (Zeuxis) sinarus (Caenogastropoda) into the Ariake Inland Sea, Kyûshû, Japan

Ai TAMAKI, Nozomi MAHORI, Takeshi ISHIBASHI and Hiroshi FUKUDA

Abstract During a survey of the Ariake Inland Sea, Kyûshû, Japan, Stenothyra sp. (Stenothyridae) and Nassarius (Zeuxis) sinarus (Philippi, 1851) (Nassariidae) were found. Neither has been recorded in Japan before. S. sp. was also collected from Korea. N. (Z.) sinarus has been hitherto known only in China. It is clear that both these species have recently intruded into the Ariake Inland Sea. They are likely to have been introduced with edible species (e.g. Sinonovacula constricta (Lamarck, 1818)) from the coast of continental China. Although these two species have been found only in the inner parts of the Inland Sea, they may extend their distribution in Japan and thus precautions should be taken.

Key words: SStenothyridae, Nassariidae, Gastropoda, new records, pest, tidal-flat, inner bay, Ariake Inland Sea

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Brief Communication

A new locality of the endangered freshwater snailCamptoceras hirasei (Gastropoda: Pulmonata: Planorbidae) in Wakayama Prefecture, Japan

Hideki MARUI

Abstract Camptoceras hirasei Walker, 1919, an endangered planorbid, was found in a pond in Wakayama Prefecture, western Honshu. It was adhering to near the roots of emergent plants Scirpus triangulatus Roxb. and Typha angustifolia L.

Key words: Camptoceras hirasei, endangered species, habitat, pond, Wakayama Prefecture

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New distribution records of Allochroa layardi (Gastropoda: Pulmonata: Ellobiidae) from the Japan Sea coast of Honshû, Japan


Abstract Two empty shells of Allochroa layardi (H. & A. Adams, 1855) were collected from Toragasaki, Hagi City and Hijû, Hôhoku-chô, Toyora-gun, both of Yamaguchi Prefecture. These are the first records of A. layardi from the Japan Sea coast of Honshû.

Key words: Ellobiidae, Allochroa layardi, new localities, distribution, Japan Sea, Hagi City, Hôhoku-chô, Yamaguchi Prefecture, Honshû

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