Circulus liratus (A. E. Verrill, 1882) Lirate Vitrinella
Although synonymized with Cyclostremiscus pentagonus (Gabb,
1873) by Abbott (1974), this species is quite distinct and, among
Carolinian species, it more closely resembles juvenile
Cyclostremiscus beauii (P. Fischer, 1857) but has a generally
smaller shell, consistently smaller protoconch, proportionately
wider umbilicus, fewer spirals on its base, flatter profile, and
tighter coil. A. E. Verrill (1882: 529) did not illustrate this
species; Spencer and Campbell (1987) and Lyons (1989: 8; plate 11:
figs. 7a, 7b) correctly interpret it. Recent range RI (type
locality) to St. Lucie Co., FL (Lyons, 1989) and the Pleistocene of
VA (Spencer and Campbell, 1987). Quite similar to the E. Atlantic
Circulus striatus (Philippi, 1836), type of Circulus
Jeffreys, 1867, but is higher and less carinate in profile.
Vitrinella semisculpta Olsson and McGinty, 1958 has fewer
spirals and a less exposed umbilicus. Vitrinella mooreana
Vanatta, 1903 (perhaps better placed in Solariorbis),
described from Bay (“Calhoun”) Co., FL and known from there,
Antigua, and Brazil (Lee Collection), is a more strongly sculptured
shell with a nearly smooth base, constricted umbilicus, and
thickened columellar lip. [Slight paraphrase of Lee (2009: 65;
species no. 309)].
Abbott, R. T., 1974. American seashells. Second edition. Van Nostrand Reinhold Co., New York, pp. 1-663 incl. numerous text figs. + 24 pls.
Lee, H. G., 2009. Marine shells of northeast Florida. Jacksonville Shell Club, Jacksonville, FL. Pp. 204 + 19 color pls. 28 May.
Lyons, W. G., 1989. Nearshore marine ecology at Hutchinson Is., Florida: 1971-1974 XI. Mollusks. Florida Marine Research Publications 47: iii + 1-131 incl. 28 pls.
Olsson, A.A. and T. L. McGinty, 1958. Recent marine mollusks from the Caribbean coast of Panama with the description of some new genera and species. Bull. Amer. Paleont. 39(177): 1-58.
Spencer, R. S. and L. D. Campbell, 1987. The fauna and paleoecology of the Late Pleistocene marine sediments of southeastern Virginia. Bull. Amer. Paleont. 92(327): 1-124.
Vanatta, E. G. 1904. A list of shells collected in western Florida and Horn Island, Mississippi. Proceedings of the Academy of Natural Sciences of Philadelphia 55: 756-759. 15 Jan.
Verrill, A. E. 1882 Catalogue of marine Mollusca added to the fauna of the New England region, during the past ten years. Transactions of the Connecticut Academy of Arts and
Ft. Fisher, Kure Beach, North Carolina (about 2 mm.) | Digital images by David Kirsh