Arcuatula senhousia (Benson, 1842)
Mytiloidea : Mytilidae
To size: To 40mm. Shell Structure: Thin, fragile. Equivalve: Equivalve. Equilateral: Inequilateral, beaks to the extreme anterior. Tumidity: Fairly tumid. Outline: Modioliform, wedge-shaped; antero-dorsal margin straight, gently sloping to broadly rounded posterior margin. Ventral margin straight. Anterior margin acutely rounded, protruding in front of and below beaks.
Sculpture: No sculpture, smooth shell. Margin: Smooth. Ligament: Thin brown band, 2/3rds the length of antero-dorsal margin. Hinge: Edentulous, but with 10-12 small, sloping teeth behind leigament. Pallial Musculature: Obscure. Colour: Green with brown zigzags and stripes. The stripes give the appearance of ribs.
Distribution & Ecology
Outside its natural range it is recorded in BRitish Columbia, Canada and southwards to Mexico. Also recorded in New Zealand, Australia, MEditerranean, Bay of Biscay, Netherlands and now UK.
First recorded in the UK in the Solent (discovered in 2017) by Barfield et al (2018), this records has since been superceded by Worsfold et al (2020) with previously unpublished survey records from 2011 in Southampton Water.
Additional Information & Related Species
Mytiloidea : Mytilidae
Listed are literature citing Arcuatula senhousia (Benson, 1842). Reference containing the species Type Description is highlighted.
Barfield P., Holmes A.M., Watson G. & Rowe G. 2018. First Evidence of Arcuatula senhousia (Benson, 1842) the Asian date Mussel in UK waters. Journal of Conchology. 42(2): 217-222.
Benson W.H. in T. Cantor 1842. General features of CHusan, with remarks on the flora and fauna of that island. The Annals and Magazine of Natural History. series 1 9(60): 489.
Worsfold T.M., Pennisi N. & Ashelby C.W. 2020. Theora lubrica Gould, 1861 (Bivalvia: Semelidae), new to the U.K. with notes on associated non-native species and an earlier date of introduction for Arcuatula senhousia (Bivalvia: Mytilidae) to the U.K.. Journal of Conchology. 43(6): 665-674.
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