|
Pyrgulopsis Minckleyi
''Pyrgulopsis'' is a genus of freshwater snails with a gill and an operculum (gastropod), operculum, aquatic animal, aquatic gastropod mollusks in the family Hydrobiidae. Etymology The name ''Pyrgulopsis'' is composed from ''Pyrgula'', another genus of snail, and ''opsis'' = :wiktionary:aspect, aspect of. Description Generic characters of the genus ''Pyrgulopsis'' are: the gastropod shell, shell is minute, conically turreted, somewhat elongated, imperforate and unicarinate. The apex (mollusc), apex is acute. The aperture (mollusc), aperture is ovate. The edge of the aperture, called the peritreme, is continuous. The operculum (gastropod), operculum is ovate, thin, corneous and spiral, with polar point well forward and approximating the columella (mollusc), columella. The jaw is thin and membranaceous. The radula is odontophore, with teeth are arranged in transverse rows, according to the formula 3 + 1 + 3. Formula for denticles of rhachidian: . Distribution The distributi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrgulopsis Nevadensis
The corded purg, scientific name ''Pyrgulopsis nevadensis'', is an extinct species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. ''Pyrgulopsis nevadensis'' is the type species of the genus '' Pyrgulopsis''. Call R. E. & Pilsbry H. A. 1886. ''On Pyrgulopsis, a new genus of rissoid mollusk, with description of two new forms''Proceeding Davenport Academy of Natural Sciences, volume V. pag914Plate II. figures 1-10. Shell description The shell is small, somewhat elongated, variable, turreted and imperforate. The shell has 4½-5½ whorls, that are strongly unicarinate on periphery, otherwise smooth. The epidermis is shining, light straw in color or whitish. The suture is white. The suture is deeply and regularly impressed, made conspicuous by the approximating carina. There existed also smooth variation.plate II, figure 6-8. The aperture is very oblique, roundly ovate, with an angle on outer edge corresponding to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
