Taxonomic revision of Pisidium punctatum Sterki, 1895 (Bivalvia : Sphaeriidae)

Citation
Av. Korniushin et al., Taxonomic revision of Pisidium punctatum Sterki, 1895 (Bivalvia : Sphaeriidae), MALACOLOGIA, 43(1-2), 2001, pp. 337-347
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
MALACOLOGIA
ISSN journal
0076-2997 → ACNP
Volume
43
Issue
1-2
Year of publication
2001
Pages
337 - 347
Database
ISI
SICI code
0076-2997(2001)43:1-2<337:TROPPS>2.0.ZU;2-4
Abstract
The status of Pisidium punctatum Sterki, 1895, is revised based on the exam ination of type material and new collections from the lower Great Lakes. He terogeneity of the shell and anatomical characteristics suggests that this taxon is a composite of two different species. The two varieties of P. punc tatum described from the Great Lakes basin - P. punctatum s. str and P punc tatum var. armatum Sterki, 1905 - are synonymized with the Eurasian native P moitessierianum Paladilhe, 1866, because they all possess crescent-shaped folds around the umbones, similar hinge morphology, poorly developed radia l mantle muscles, and a profoundly reduced dorsal lobe of the nephridium. P isidium punctatum var. simplex Sterki, 1905, previously established as a fo rm of P. punctatum, is redescribed and raised to species rank. Pisidium sim plex is distinguished from P. moitessierianum by the absence of umbonal fol ds and by having a more elongated shell, less extensively developed hinge t eeth, and more pronounced mantle muscle bundles. In addition, P. simplex ap pears to have a much broader distribution in North America than P. moitessi erianum. Pisidium simplex resembles the Central American native P. punctife rum (Guppy, 1867) in mantle musculature and nephridium shape, suggesting a close affinity between these taxa. Lectotypes of P. punctatum s. str., P. p unctatum var. armatum, and P. punctatum var. simplex are designated.