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Asperarca Nodulosa
''Asperarca'' is a genus of bivalves in the Family (biology), family Ark clam, Arcidae which currently consists of eight species. They attach themselves to rocks or hard substrates with Byssus, 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. The earliest known species are ''A. acuta'' and ''A. microida'' which were found in 2014 in Ukraine from the Eocene Epoch. Description 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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asperarca Acuta
''Asperarca'' is a genus of bivalves in the Family (biology), family Ark clam, Arcidae which currently consists of eight species. They attach themselves to rocks or hard substrates with Byssus, 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. The earliest known species are ''A. acuta'' and ''A. microida'' which were found in 2014 in Ukraine from the Eocene Epoch. Description 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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |