| Pyrgophorus spinosus | |
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| Drawing of two apertural views and one lateral view of the shell of Pyrgophorus spinosus | |
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| Species: | P. spinosus |
| Binomial name | |
| Pyrgophorus spinosus | |
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Pyrgophorus spinosus, common name the spiny crownsnail, is a species of very small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Pyrgophorus spinosus was described by Richard Ellsworth Call and by Henry Augustus Pilsbry in 1886 as Pyrgulopsis spinosus [1] but until César Marie Félix Ancey established the new genus Pyrgophorus in 1888, it was not clear what genus this species belonged to. [2]
The shell is minute, imperforate, turreted and unicarinate. The carina is modified into spinous processes on last three whorls. The carina is darker colored than balance of shell. The shell has 5-5½ whorls. The first two whorls are rounded, destitute of spines or carina. The last three whorls are somewhat geniculate, angled at location of carina. The body whorl is large, sometimes with an occasional spine below the carina. The epidermis is light horn in color, nearly white at apex, with microscopic longitudinal revolving striae and shining. [1]
The aperture is roundly ovate, slightly longer than broad and rounded anteriorly. The peristome is not continuous. The peristome is sharp, simple, slightly reflected near the columella, suggesting a faint umbilicus. The suture is slightly impressed. [1]
The width of the shell is 1.52-2.34 mm. The height of the shell is 3.00-3.86 mm. [1]
The type locality is Comal Creek, a clear stream at New Braunfels, Texas, on rocky bottoms. [1]
In 1886, Pyrgophorus spinosus inhabited its type locality along with numerous specimens of Goniobasis pleuristriata Say, Amnicola (species undetermined), and Bythinella (species undetermined). [1]
Pyrgulopsis is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
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.
The Utah roundmouth snail, also known as the Utah valvata or desert valvata, scientific name Valvata utahensis, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Valvatidae, the valve snails.
The Socorro springsnail, scientific name Pyrgulopsis neomexicana, is an endangered species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae, the mud snails.
Amnicola walkeri, common name Canadian duskysnail, is a species of freshwater snail, an aquatic gastropod mollusk in the family Amnicolidae.
Amnicola dalli, common name the peninsula amnicola, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Amnicolidae.
Marstonia scalariformis, previously known as Pyrgulopsis scalariformis, common name the moss pyrg, is a species of freshwater snail with a gill and an operculum, aquatic gastropod mollusc in the family Hydrobiidae.
Pyrgula annulata is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Pyrgulopsis deserta is a species of freshwater snail in the family Hydrobiidae, the mud snails. It is known by the common names desert springsnail, Virgin springsnail, and St. George snail. It occurs in southwestern Utah and northwestern Arizona in the United States.
Hyperaulax ridleyi is a species of tropical air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Odontostomidae.
Turbo chrysostomus, common name the gold-mouth turban, is a species of sea snail, marine gastropod mollusk in the family Turbinidae.
Olivella nana, common name the sparkling dwarf olive, is a species of small sea snail, marine gastropod mollusk in the subfamily Olivellinae, in the family Olividae, the olives. Species in the genus Olivella are commonly called dwarf olives.
Amphidromus perversus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Camaenidae.
Scutalus phaeocheilus is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Bulimulidae.
Drymaeus cecileae is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Bulimulidae.
Potamolithus rushii is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae.
Phanerolepida transenna is a rare species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.
Bolma henica, common name the deep sea star shell, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.
Oligohalinophila dorri is a species of brackish water snail, with gills and an operculum, a gastropod mollusk in the family Nassariidae, the nassa mud snails or dog whelks.
Zonitoides apertus is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Gastrodontidae.
This article incorporates public domain text from reference. [1]