| 词条 | Pyrgophorus spinosus |
| 释义 |
| image = Pyrgophorus spinosus shell.jpg | image_caption = Drawing of two apertural views and one lateral view of the shell of Pyrgophorus spinosus | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Caenogastropoda clade Hypsogastropoda clade Littorinimorpha | superfamilia = Rissooidea | familia = Hydrobiidae | subfamilia = | genus = Pyrgophorus | subgenus = | species = P. spinosus | binomial = Pyrgophorus spinosus | binomial_authority = (Call & Pilsbry, 1886)[1] | synonyms = *Pyrgulopsis spinosus Call & Pilsbry, 1886 }} 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. TaxonomyPyrgophorus 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]Shell descriptionThe 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 operculum is spiral and reddish horn in color.[1] DistributionThe type locality is Comal Creek, a clear stream at New Braunfels, Texas, on rocky bottoms.[1] HabitatIn 1886, Pyrgophorus spinosus inhabited its type locality along with numerous specimens of Goniobasis pleuristriata Say, Amnicola (species undetermined), and Bythinella (species undetermined).[1] ReferencesThis article incorporates public domain text from reference.[1] 1. ^1 2 3 4 5 6 7 8 Call R. E. & Pilsbry H. A. 1886. On Pyrgulopsis, a new genus of rissoid mollusk, with description of two new forms. [https://archive.org/details/proceedingsofdav05dave Proceeding Davenport Academy of Natural Sciences, volume V.], page [https://archive.org/stream/proceedingsofdav05dave#page/8/mode/2up 9]-14. [https://archive.org/stream/proceedingsofdav05dave#page/n307/mode/2up Plate II.], figures 17-19. 2. ^Pilsbry H. A. 1886. Description of a New Hydrobia, with Notes on Other Rissoidae. [https://archive.org/details/proceedingsofdav05dave Proceeding Davenport Academy of Natural Sciences, volume V.], [https://archive.org/stream/proceedingsofdav05dave#page/34/mode/1up page 34]. External links{{Commons category|Pyrgophorus spinosus}}{{Taxonbar|from=Q3177011}}{{DEFAULTSORT:Pyrgophorus Spinosus}} 2 : Hydrobiidae|Gastropods described in 1886 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。