Helcionopsis
Introduction '''''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.
Species Species in the genus ''Helcionopsis'' include:* ''Helcionopsis radiatum'' (Lindström, 1884)* ''Helcionopsis reticulatus'' Easton, 1943* ''Helcionopsis striata'' Ulrich, 1897* ''Helcionopsis subcarinata'' Ulrich & Scofield, 1897
Shell description General form and position of apex is as in ''Tryblidium'', from which ''Helcionopsis'' differ in having the surface marked by fine radiating striae. Muscular scars of this genus ''Helcionopsis'' unknown in 1897, when the genus was described.
References This article incorporates public domain text from reference.