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Family Noetiidae - noetiid ark shells (noetiid)
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Order
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Class
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Bivalvia
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No. of Genera in Ref.
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No. of Species in Ref.
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Environment
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Fresh : No |
Brackish : No |
Marine : No
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Aquarium
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First Fossil Record
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Remark
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Shell solid, equivalve, subtrigonal, trapezoidal to elliptical in shape, generally inequilateral and longer than high. Umbones often opisthogyrate, set apart from dorsal margin by a trigonal cardinal area. Ligament external stretching across the cardinal area, with oblique grooves and transverse striations. Outer surface with radial sculpture. Periostracum conspicuous, generally pilose. Hinge elongate, straightish to slightly arched, with numerous small transverse teeth which somewhat increase in size towards anterior and posterior ends. Interior of shell porcelaneous. Two subequal adductor muscle scars, with a ridge or a shelf present along the inner margin of one or both scars. Pallial line without a sinus. Sedentary animals, with habitat and mode of life very similar to Arcidae (Ref. 348).
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Etymology
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Division
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Reproductive guild
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Typical activity level
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Main Ref.
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Coordinator
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