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(L) Vertigo gouldii (A. Binney, 1843)* 1.85 mm. |
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(R) Vertigo bollesiana (Morse, 1865) 1.65 mm. |
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Collected together in leaf litter, mixed woods near marble quarry swimming area in the valley of the West Branch of the Batten Kill, E side of VT Rte. 30, 1.6 mi. SE Dorset, Bennington Co., VT by H. Lee on 11 Sept., 2004. The distinction between these two species was apparently questioned until Pilsbry (1919: 101-102), who attributed this comparison to Morse: "it [Vertigo bollesiana] is smaller, lighter-colored and more translucent than V. gouldii, and it is less distinctly striated [H.A.P. italics]. The teeth are smaller, especially the palatals." Pilsbry also noted the "rather large oblique depression over the palatal fold," which is starkly demonstrated in the dorsal perspective in the lower right; this view has not appeared in the literature.
* Amos Binney (1843: 105) named his new species Pupa gouldii.
Although many later authors rendered the species epithet "gouldi,"
that spelling constitutes an incorrect subsequent spelling or an
unjustified emendation, and the
binomen Vertigo gouldi is unavailable for purposes of
taxonomic nomenclature (ICZN, 1999: 42-43; Article 33.3). International Commission for Zoological Nomenclature (ICZN), 1999. International code of zoological nomenclature fourth edition. pp. 1-306 + i-xxix.
Pilsbry, H. A., 1918-20. Manual of Conchology (second series).
25. Pupillidae (Gastrocoptinae, Vertigininae). Academy of
Natural Sciences, Philadelphia. ix + 1-401 + 34 pls. Nov. 5 to Apr. |
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