Differences in Inhalant Siphonal Papillae among the Japanese Species of Corbicula (Mollusca : Bivalvia)

Abstract

Three common species of Japanese Corbicula are shown to differ in their morphology of the inhalant siphonal papillae. They are predominantly simple and least in number in freshwater Corbicula Ieana, predominantly simple but more numerous in brackish Corbicula japonica, and variable in shape and decisively most numerous in Corbicula sandai of Lake Biwa-ko. Corbicula insularis from Shirahama and Corbicula Jluminea from Hong Kong are also compared. Shell morphometries are provided for the representative samples of four species from Japan. The taxonomy of the three Japanese species is reviewed briefly.

A revision of some Asian and African freshwater clams assigned to Type="Italic">Corbicula fluminalis (M�ller, 1774) (Mollusca: Bivalvia: Corbiculidae), with a review of anatomical characters and reproductive features based on museum collections

“…In this revision another Asian estuarine taxon, Corbicula japonica, was tentatively synonymised to C. fluminalis. However, the later Japanese authors (Harada & Nishino, 1995;Komaru et al, 1998) did not accept this suggestion, and continued to treat C. japonica alongside the other insular taxa (Corbicula leana Prime, 1864 and Corbicula sandai Reinhardt, 1878) as a distinct valid species.…”

“…Shell characters referred to in taxonomic descriptions and reviews (Izzatullaev, 1980;Morton, 1982Morton, , 1986Mandahl-Barth, 1988;Araujo et al, 1993;Harada & Nishino, 1995;Swinnen et al, 1998) were checked in each lot. In addition to the conventional measurements (i.e.…”

“…Anatomical studies of C. fluminea populations in Europe (Araujo et al, 1993) and China (Chen et al, 1995) corroborated the diagnosis of Britton & Morton (1979). At the same time, differences in anatomical characters among Japanese taxa were reported (Harada & Nishino, 1995). However, the anatomical review of C. fluminalis remained incomplete, since neither the populations from West Asia representing C. fluminalis s.str., nor any of the presumably conspecific African taxa were included.…”

Aspectos morfológicos e de incubação em três espécies de Corbicula Mühlfeld, no lago Guaíba, Rio Grande do Sul, Brasil (Bivalvia, Corbiculidae)

“…Britton & Morton (1979) e Harada & Nishino (1995) apresentaram diagramas de sifões inalantes de espécies de Corbicula, sendo que o arranjo e forma das papilas dos espécimes do lago Guaíba mostraram-se bastante similares aos diagramas daqueles autores. Cabe ressaltar que os espécimes, do lago Guaíba, identificados como C. fluminea mostraram uma forte pigmentação externa ao redor dos sifões e seus tentáculos são mais pigmentados do que os das outras duas espécies.…”

“…A maioria dos trabalhos se refere às características morfológicas de C. fluminea, em decorrência de sua importância e principalmente pelos grandes prejuízos causados na América do Norte, em especial, as questões relacionadas com a captação de água para fins de irrigação, industrial e geração de eletricidade (Britton & Morton 1982, Araújo, Moreno & Ramos 1993, Korniushin & Glaubrecht 2002. Os autores Harada & Nishino (1995) enfocaram aspectos do sifão inalante para diferenciação de espécies japonesas de Corbicula. No Brasil são poucos os estudos relativos a características morfológicas de Corbicula, Mansur & Meier-Brook (2000) descreveram alguns aspectos da concha e partes moles de espécimes de C. fluminea oriundas do lago Guaíba em comparação com espécimes da família Sphaeriidae.…”