Original Articles
The fauna of intertidal patellogastropods of Hokkaido, northern Japan
Ryo NAKAYAMA and Tomoyuki NAKANO
|
|
Summary We collected 15 species of intertidal patellogastropod limpets from 19 localities of entire coast of Hokkaido. Distribution of these limpets are divided into 3 geographic patterns; The southern Hokkaido pattern (temperate species: Cellana toreuma, C. grata, Nipponacmea gloriosa, N. schrenckii, N. fuscoviridis and N. concinna), The majority Hokkaido pattern (pan-temperate species: Lottia tenuisculpta, L. lindbergi and N. nigrans; cool temperate species: L. goshimai and N. habei ), and The eastern Hokkaido pattern (subarctic species: L. cassis and Lottia sp.). Northernmost record of L. goshimai and N. gloriosa are updated. L. cassis, L. tenuisculpta, L. goshimai, N. gloriosa and N. pallida were found on shell surfaces of other molluscs as well as on rocks or under boulders. We also discussed the epizoism of these limpets. |
|
|
Key words: biogeography, epizoic limpet |
The valid scientific name for the species previously known as Chlorostoma lischkei Tapparone-Canefri, 1874 (Vetigastropoda: Trochida: Tegulidae)
Hiroshi FUKUDA and Daishi YAMAZAKI
|
|
Summary Chlorostoma lischkei Tapparone-Canefri, 1874 has consistently been used for a common tegulid species of Japan (Kubo-gai in Japanese) in recent years. However, the type specimen of C. rugatum Gould, 1861, that has often been regarded as a subspecies of C. lischkei, is not distinguishable from the latter. The publication year of C. rugatum is earlier than that of C. lischkei, and C. rugatum is thus valid for the species. Because Chlorostoma Swainson, 1840 is a junior synonym of Tegula Lesson, 1832, the valid name of Kubo-gai should be Tegula rugata (Gould, 1861). C. argyrostomum var. basiliratum Pilsbry, 1901 and C. r. sublaevis Pilsbry, 1904 are junior synonyms of T. rugata too. |
|
|
Key words: Chlorostoma argyrostomum basiliratum, Chlorostoma rugatum, Chlorostoma sublaevis, Gastropoda, Latin name, nomenclature, synonym, Tegula rugata, Trochoidea |
A report of "spontaneous shell evacuation" in a live individual of Cipangopaludina cf. laeta (Martens, 1861) (Gastropoda: Viviparidae)
Tomoyuki NAKANO, Kuniyuki FURUKAWA, Takuma HAGA and Hiroshi FUKUDA
|
|
Summary This is a report of "spontaneous shell evacuation" by a live individual of the freshwater viviparid snail Cipangopaludina cf. laeta in an aquarium. Having shed its shell, the naked animal crawled around the rock surface and tank wall and survived for two days. It died one day after being removed for photography and returned to the water. Similar shell evacuations have been reported in two marine neogastropods, Babylonia areolata (Link, 1807) and Rapana rapiformis (Born, 1778) in the laboratory and in a freshwater pleurocerid, Lithasia sp., and an intertidal littorinid, Littorina littorea (Linnaeus, 1758), in their natural habitats. It is at present difficult to explain why spontaneous shell evacuation in gastropods occurs, but possible causes include disease, bacteria, parasites, water chemistry or reduced oxygen. |
|
|
Key words: gastropods, niku-nuki, snails, unusual behavior |
New distribution records of two species of Nassariidae (Neogastropoda: Buccinoidea): Nassarius olivaceus (Bruguiere, 1789) and Nassarius niger (Hombron & Jacquinot, 1848) from the Urauchi River estuary, Iriomote Island, the Ryukyus, southwestern Japan
Koji NISHIGAKI and Hirofumi YAGI
|
|
Summary Two nassariid species, Nassarius olivaceus (Bruguiere, 1789) and N. niger (Hombron & Jacquinot, 1848) were collected from a mangrove swamp at the Urauchi River estuary, Iriomote Island in the Ryukyu Archipelago. This is the first reliable record of N. olivaceus from the island and that of N. niger from Okinawa Prefecture. The shells of the collected specimens and the habitat of the collection site are described. The occurrence records of these two species in the previous works are briefly reviewed. |
|
|
Key words: mangrove, Nansei Islands, Okinawa Prefecture, Yaeyama Islands |
Discovery of Gastrocopta armigerella (Reinhardt, 1877) (Gastropoda: Gastrocoptidae) from Jeju Island, South Korea
Kazuki KIMURA, Satoshi CHIBA and Jae-Hong PAK
|
|
Summary The maritime gastropod Gastrocopta armigerella (Reinhardt, 1877) was found from Jeju Island, South Korea. This is the first record from the island. |
|
|
Key words: Eupulmonata, geographic distribution, land snail, new record |
A record of Satsuma cardiostoma (Kobelt, 1879) (Eupulmonata: Camaenidae) from Mt. Hakusan, Ishikawa Prefecture, Japan, and observations of the spawning and hatching in the laboratory
Naoto SAWADA
|
|
Summary Satsuma cardiostoma (Kobelt, 1879) is distributed mainly from Hyogo to Toyama prefectures in the Japan Sea side region, central Honshu, Japan. In Ishikawa Prefecture, this species was known from Mt. Hakusan and other five localities (two in Kanazawa City, two in Nomi City, and one in Hakusan City). A live adult individual of the species was collected in Mt. Hakusan. Mt. Hakusan has been assumed to be the type locality of the species and the present individual is the second occurrence record from there. The spawning behaviour was observed twice (10 and 7 eggs respectively) in October in the laboratory. The eggs were translucent white and oval (3.4 mm long, and 2.6 mm wide; on the basis of the 10 eggs obtained at the first spawning). Two juveniles hatched 43 days later after the first spawning, while all the 7 eggs of the second spawning were dead before hatching. The shells of the juveniles were translucent yellowish-brown, and 3.8 mm in diameter; their external head-hoot was yellowish white in colour. |
|
|
Key words: endangered species, gastropods, land snail, terrestrial mollusc |
The northernmost record of Byssogerdius striatulus (Hanley, 1843) (Bivalvia: Mytilidae) — Specimens from Hagi, the Japan Sea coast of Yamaguchi Prefecture, western Honshu, Japan
Hiroshi FUKUDA and Keiji IWASAKI
|
|
Summary Byssogerdius striatulus (Hanley, 1843), a tropical brackish-water mytilid bivalve, was known from Taiwan and southwards in the tropical Indo-West Pacific and then reported in Amami-Oshima Island and southern Shikoku recently. The species is here recorded in Hagi, the Japan Sea coast of Yamaguchi Prefecture, western Honshu, on the basis of two specimens which were collected in 1974 and 2004. These are the northernmost records of the species and the oldest ones in Japan. The species might have been found in Hagi by the introduction with timber transportation or the ballast water of ship and/or by the rise in seawater temperature with global warming. |
|
|
Key words: ballast water, biofouling, Brachidontes, introduced species, global warming, Modiola emarginatus, Modiola striatula, Mytilida, new distribution record, sessile organism, taxonomy |
A record of Arthritica japonica Lutzen & Takahashi, 2003 (Bivalvia: Galeommatidae) from Kasaoka Bay, Okayama Prefecture, western Japan
Taigi SATO
|
|
Summary A rare bivalve species Arthritica japonica Lutzen & Takahashi, 2003, a commensal with pinnotherid carb Xenophthalmus pinnotheroides White, 1846, was found together with the host crab in Kasaoka Bay, Okayama Prefecture. This is the first reliable record from the Prefecture. |
|
|
Key words: commensal, conservation, Galeommatoidea, habitat, inner bay, introduction, new locality, Leptonidae, tidal flat, Xenophthalmus pinnotheroides |