Monograph of the Mizunami Fossil Museum No. 6
Glycymeris cisshuensis (Mollusca: Bivalvia), an ancestral species of temperate glycymeridids from Japan and Korea
- MMFM06-005Matsukuma, 1986（PDF 6.58MB）
Matsukuma (1986) print-version
Published: 1986/3/25 Page: 59–74, pls.6–7
Although a bivalve subgenus Veletuceta Iredale, 1931 has commonly been accepted as a junior synonym of Glycymeris Costa, 1776, some Indo-West Pacific fossil and living species should be placed in Veletuceta. Veletuceta species have dense hairy periostraca, imbedded lamellar layers on the smooth ligamental area and anus attached to the posterior adductor, and clearly differ from Glycymeris (s. s.) species in lacking distantly spaced periostracal hairs, grooved ligamental area and protruding anus. Oligo-Miocene Glycymeris cisshuensis Makiyama, 1926 seems to be the first species of Veletuceta. Glycymeris cisshuensis has regularly spaced, fine periostracal striae and smooth ligamental area. Its geographic distribution is restricted to Kyushu to Hokkaido, and Korean Peninsula. Pliocene to Recent Veletuceta species Glycymeris albolineata (Lischke, 1872) and G. vestita (Dunker, 1877) are also restricted to temperate Japanese waters. They may be descendants of G. cisshurnsis.