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Asperarca

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Asperarca
Asperarca nodulosa
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Arcida
Family: Arcidae
Genus: Asperarca
Sacco, 1898
Species

See text

Asperarca[1] is a genus of bivalves in the family Arcidae[2] which currently consists of eight species. They attach themselves to rocks or hard substrates with byssal threads in shallower, coastal waters. It was first described by Dr. Federico Sacco in December 1898 with the type taxon A. nodulosa that has been recorded throughout the coastal Mediterranean Sea, Baltic Sea, and northeastern Atlantic Ocean.[1] The earliest known species are A. acuta and A. microida which were found in 2014 in Ukraine from the Eocene Epoch.[3]

Description

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Shells in this genus are elongated and rectangular at about 6-32 millimeters in length. The hinged side of the shell is a straight line which curves into a rounded edge. One side of the hinge has 10-20 prominent teeth while the other has matching indentations. The prodissoconch starts out rounded and nearly circular before stretching into a parallelogram with a distinct diagonal point on the far end of the adult shell. Some have described it as more of a trapezoid shape. Shells tend to have a tan or beige periostracum and are convex with the highest point just in front of the hinge.[4] Byssal threads extend from the hinge to attach shells to hard surfaces or substrates.

Species

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References

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  1. ^ a b Bellardi, Luigi; Bellardi, Luigi; Sacco, Federico (1898). I molluschi dei terreni terziarii del Piemonte e della Liguria. Vol. pt.26 (1898). Torino: Stamperia Reale.
  2. ^ "WoRMS - World Register of Marine Species - Asperarca Sacco, 1898". www.marinespecies.org. Retrieved 2023-12-14.
  3. ^ a b c Berezovsky, A. A. (2014-11-01). "New species of Asperarca (Bivalvia, Arcidae) from the Upper Eocene of Ukraine". Paleontological Journal. 48 (6): 575–579. doi:10.1134/S0031030114060033. ISSN 1555-6174.
  4. ^ a b Francisco, Jonata de A.; Barros, José Carlos N. de; Lima, Silvio Felipe B. de (2012). "Five new species of Arcidae from Brazil with description of new genus: Paranadara (Mollusca: Bivalvia)". Journal of the Marine Biological Association of the United Kingdom. 92 (5): 1139–1150. doi:10.1017/S0025315411000919. ISSN 1469-7769.
  5. ^ a b Società italiana di malacologia.; malacologia, Società italiana di; italiana, Unione malacologica (1997). Bollettino malacologico. Vol. v.33 (1997). Milano: Unione malacologica italiana.