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Argyrotheca
''Argyrotheca'' is a genus of very small to minute lampshells (maximum long). All species share a large pedicel opening (or foramen), one ridge on the inside of the pedunculate valve, pits in a diamond pattern on the inside of both valves, and without radial ridges that end in tubercles. It occurs in depths between 6 and 1300 m. It is known since the latest Cretaceous. Description Some ''Argyrotheca'' species have red stripes radiating from the pedicle opening (or foramen). These species are among a few living brachiopods with color marking on the shell. All other colored brachiopods are from shallow water too. This kind of color patterns may be a form of camouflage. ''Argyrotheca'' is fastened by a very short and thick stalk. The shell is biconvex with two high and wide ribs radiating close to the midline (a shell-shape called strangulate) and four radiating ribs of declining height and width further lateral (a shell-shape called oppositely multiplicate), smooth or more commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argyrotheca Cuneata Draw
''Argyrotheca'' is a genus of very small to minute Brachiopod, lampshells (maximum long). All species share a large pedicel opening (or foramen), one ridge on the inside of the pedunculate valve, pits in a diamond pattern on the inside of both valves, and without radial ridges that end in tubercles. It occurs in depths between 6 and 1300 m. It is known since the latest Cretaceous. Description Some ''Argyrotheca'' species have red stripes radiating from the pedicle opening (or foramen). These species are among a few living brachiopods with color marking on the shell. All other colored brachiopods are from shallow water too. This kind of color patterns may be a form of camouflage. ''Argyrotheca'' is fastened by a very short and thick stalk. The shell is biconvex with two high and wide ribs radiating close to the midline (a shell-shape called strangulate) and four radiating ribs of declining height and width further lateral (a shell-shape called oppositely multiplicate), smooth or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |