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Helcionopsis
''Helcionopsis'' is an extinct genus of paleozoic monoplacophoran in the family Tryblidiidae. The generic name is from the external resemblance which the genus bear to the recent species of the genus ''Helcion'' in family Patellidae Patellidae is a taxonomic family of sea snails or true limpets, marine gastropod molluscs in the clade Patellogastropoda. (The superfamily Patelloidea should not be confused with the similar-sounding genus of true limpets ''Patelloida'' which .... Species Species in the genus ''Helcionopsis'' include: * '' Helcionopsis radiatum'' (Lindström, 1884) * '' Helcionopsis reticulatus'' Easton, 1943 * '' Helcionopsis striata'' Ulrich, 1897 * '' Helcionopsis subcarinata'' Ulrich & Scofield, 1897Ulrich E. O. & Scofield W. H. 1897. ''The Lower Silurian Gastropoda of Minnesota''page 827828plate VXI figure 28. Shell description General form and position of apex is as in '' Tryblidium'', from which ''Helcionopsis'' differ in having the surface marked by f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helcionopsis Radiatum
''Helcionopsis radiatum'' is an extinct species of paleozoic monoplacophoran in the family Tryblidiidae. This species was first named as ''Tryblidium radiatum'' and described from Silurian in crystalline limestone of Wialmsudd near Fårösund in Sweden by Gustaf Lindström Gustaf Lindström (27 August 1829 – 16 May 1901) was a Sweden, Swedish paleontologist. He was born in Visby on Gotland. In 1848 he entered Uppsala University, and in 1854 he took his doctor's degree. Having attended a course of lectures in ... in 1884. Lindsröm found only one specimen. Shell description The shell is oval and much elevatedly conical. The greatest height is lying near the middle of the longitudinal axis. The apex is in anterior end, truncated, curved as to lean forwards over the anterior margin of the aperture. The shell between the apex and the margin is consequently much concave. The apertural border is straight and horizontal. The surface is covered by fine, closely packed, radia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |