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Terrestrial
Gastropods of the Columbia Basin, British Columbia
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| Family SUCCINEIDAE Beck,
1837
The shell of succineids offer little indication of generic and specific identity, and identification is difficult. Genera are differentiated anatomically and many nominal species are poorly understood. Patterson (1971), and more recently Hoagland & Davis (1987), have partially revised the classification of the succineids.
Genus Catinella Pease, 1871 Shell generally short with a relatively large, conical spire; aperture rounded-ovate. Catinella is anatomically defined by the absence of a penial sheath and a distinctly differentiated epiphallus; the penis also has a prominent appendix midway on its length (Pilsbry 1948). Quickella Boettger, 1939 is a synonym (Patterson 1971). One species has been reported in British Columbia: Catinella avara (Say, 1824); however, Succinea avara is a nomen dubium and the name Catinella vermeta (Say, 1829) has been applied to some populations (Patterson & Burch 1966; Hoagland & Davis 1987). Genus Oxyloma Westerlund, 1885 Shell elongate-ovate generally with whorls elongate
and somewhat flattened between the periphery and the suture; spire
usually short; aperture more or less elongate-ovate and rather flared
posteriorly. The genus is anatomically differentiated by the presence
of an epiphallus and penial sheath and with the penis not having
an appendix (Pilsbry 1948).
Two or three species have been reported for British Columbia: Oxyloma
hawkinsii Baird, 1863; Oxyloma nuttallianum (I. Lea,
1841); and Oxyloma retusum (I. Lea, 1834). Genus Succinea Draparnaud, 1801 Shell generally short to elongate-ovate with a small to moderate spire; aperture rounded to elongate-ovate. An epiphallus and penial shealth are present, and the penis also has a small, rather narrow appendix enclosed in the penial sheath (Pilsbry 1948). One species has been reported from British Columbia: Succinea rusticana Gould, 1846. |
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BC Museum |
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