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Pinna rudis
''Pinna rudis'', the rough pen shell or spiny fan-mussel, is a species of bivalve mollusc in the family Pinnidae. 〔(Biolib ) 〕 It is the type species of the genus ''Pinna''. Knowledge about this is sparse, with an absence of specific studies and literature. 〔
==Description==
''P. rudis'' has a shell that commonly reaches a length of . 〔〔〔(Conchology ) 〕〔〔〔 The rough pen shell has a pair of very fragile, long, triangular, wedge–shaped valves, covered with large, protruding scales arranged in quite regular rows. These scales are more prominent close to the opening of the shell. A half-dozen low ribs radiate from the pointed end and run the length of the valves. Said valves are almost symmetrical, toothless, and transparent on the ends. Their color is usually reddish brown.
The spiny fan-mussel lives with the pointed anterior end of its shell vertically anchored to rock or firm sediment by numerous byssus threads. The rear edge of the shell is rounded and free.
''P. rudis'' may be confused with juveniles of ''Pinna nobilis'', but the former shows a more triangular and robust shell, with fewer and larger protruding scales. Moreover in ''P. rudis'', the color is more brown or pink-orange, while in juveniles ''P. nobilis'', it is homogeneously yellowish. Lastly, the adults of ''P. nobilis'' easily exceed the size of ''P. rudis'' and totally lose the protuberances on the surface of the shell. Also, the habitats of the two species are different, as ''P. nobilis'' can be found on muddy or sandy bottoms, while ''P. rudis'' prefers rock crevices. 〔 (AIAM Italia )〕〔 (DORIS – Données d’Observations pour la Reconnaissance et l’Identification de la faune et de la flore Subaquatiques )〕〔 (ASPIM )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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