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1 July 2008 Genetic Relationships among Species of Meretrix (Mollusca: Veneridae) in the Western Pacific Ocean
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Abstract

We compared allozymes at 12 loci in 12 populations of six species of Meretrix: M. lusoria (Japan, Korea, and Taiwan), M. petechialis (China and Korea), M. ovum (Thailand and Mozambique), M. lyrata (China), M. lamarckii (Japan), and Meretrix sp. A (Okinawa, Japan). Our allozyme results were generally consistent with the major groupings currently recognized within the genus based on morphological characters. However, we found two cryptic or undescribed species: Meretrix sp. A from Okinawa and M. cf. lusoria from Taiwan. The shell characters of Meretrix sp. A were similar to those of M. lamarckii, but the species was genetically distinct (Nei's genetic distance D > 0.845) from all other species examined. The Taiwanese Meretrix population was morphologically indistinguishable from Japanese M. lusoria, although the genetic distance between the Taiwanese and Japanese populations showed a high degree of genetic differentiation (D > 0.386). Meretrix lusoria seedlings were introduced into Taiwan from Japan in the 1920s, and Japanese M. lusoria was previously thought to be established as a cultured stock. However, our results suggest that the Taiwanese population may represent a sibling or cryptic species of M. lusoria.

Ayako Yashiki Yamakawa, Masashi Yamaguchi, and Hideyuki Imai "Genetic Relationships among Species of Meretrix (Mollusca: Veneridae) in the Western Pacific Ocean," Pacific Science 62(3), 385-394, (1 July 2008). https://doi.org/10.2984/1534-6188(2008)62[385:GRASOM]2.0.CO;2
Accepted: 1 September 2007; Published: 1 July 2008
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