|
''Catophragmus'' is the originally named genus of the family Catophragmidae. At present, it is monotypical. It is a shallow water acorn barnacle of the Tropical Western Atlantic and Caribbean characterized by small accessory imbricating plates surrounding the base of the shell wall. == Diagnosis and discussion == The shell wall of ''Catophragmus'' has eight free plates, with no fusion, and all entering the sheath. In contrast to ''Catolasmus'', the other Northern Hemisphere catophragmid genus, imbricating plates extend only partway up the primary shell wall, and have usually four whorls, as opposed to 10. Many specimens have been recovered with few or no accessory plates remaining. (491 ) As the imbricating whorls are small and apparently deciduous, this is explained as a result of grazing gastropods. The basis is calcareous, thin, and solid. Where it attaches to the shell wall, there are cavities matching small teeth on the basal edge of the wall plates.〔 (491 ) The scutum differs from that of ''Catolasmus'' in showing a well defined lateral depressor muscle pit. The labrum bears teeth and bristles, unlike in ''Catolasmus''.〔 There has been some confusion as to the exact date of Sowerby's publication. Both 1826 and 1827 can be found in different publications. This problem was addressed by Sykes, 1906, and he concluded 1826 was the correct date. Sykes is followed here, and by this editor. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Catophragmus」の詳細全文を読む スポンサード リンク
|