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Pittsburgh, PA, United States

Orstan A.,Section of Mollusks
Quaternary International | Year: 2015

A survey was carried out to determine the distribution range of Cochlostoma mienisi Schütt, 1978, a little studied land snail of southwestern Turkey. The species was found on the island of Kekova off the coast of Turkey and at an additional location on the mainland facing the island. The closest congeners of C. mienisi are on Crete and mainland Greece, more than 400 km away. As a possible explanation for its limited and disjunct range, it is proposed here that C. mienisi may have been introduced from another location by the shipping trade in the antiquity. No live snails were seen, but various conchological traits of C. mienisi provided clues to its biology and ecology. The presence of two overlapping size groups in the distribution of adult shell dimensions is interpreted as an indication of a sexual dimorphism: the larger shells (8.0 mm × 3.5 mm) are those of female snails and the smaller ones (7.4 mm × 3.3 mm) are of males. Also discussed are the structure of the operculum of C. mienisi, decollation observed in a few shells and the presence of small circular holes that were probably bored by an unknown predator or a parasite. © 2015 Elsevier Ltd. Source

Orstan A.,Section of Mollusks | Cameron R.A.D.,University of Sheffield | Cameron R.A.D.,Natural History Museum in London
Journal of Conchology | Year: 2015

The European land snail Cepaea nemoralis was introduced into Burlington, New Jersey, USA by William G. Binney in 1857 with specimens from near Sheffield, England. First in 1869 and later in 1878, Binney noted that the species had become widespread throughout the city. Between 1908 and 1933, Henry A. Pilsbry collected a large number of C. nemoralis shells in Burlington and noted that the species was still abundant in the early 1930s. A survey done in Burlington in 2013 and 2014 that included some of Pilsbry's localities found only six live snails and six empty shells. The only live snails were found near where Binney's house was in the nineteenth century. Our results show that both the range and the population of C. nemoralis in the city have declined drastically since the 1930s. The Burlington colony of C. nemoralis is characterized by high frequencies of unhanded or one-banded morphs. This suggests that Binney's founding lot may have originated from the White Peak district of Derbyshire near Sheffield, England. Source

Hotopp K.P.,Appalachian Conservation Biology | Pearce T.A.,Section of Mollusks | Nekola J.C.,University of New Mexico | Schmidt K.,Hudsonia Ltd.
Proceedings of the Academy of Natural Sciences of Philadelphia | Year: 2010

Recent land snail inventories in New York State have led to the discovery of new state geographic distribution records for seven species: Carychium nannodes Clapp, 1905; Gastrocopta procera (Gould, 1840); Lucilla scintilla (R.T. Lowe, 1852); Striatura meridionalis (Pilsbry and Ferriss, 1906); Trochulus hispida (Linnaeus, 1758); Vertigo cristata Sterki, 1919; and Vertigo paradoxa Sterki, 1900. Most are native species of eastern North America, although T. hispida is introduced from Europe. These species were found mainly by field searches in a variety of habitats roadsides, fields, forested rock talus and limestone outcrops, and coastal freshwater wetlands - but in one case through verification of specimens at the New York State Museum. Source

Orstan A.,Section of Mollusks
American Malacological Bulletin | Year: 2010

I studied the reproduction and the population turnover of a succineid land snail living by a small lake in central Maryland. The identity of the snail, deduced from its external characteristics and the genitalia, comes closest to Oxyloma retusum (Lea, 1834). The species has a semelparous life cycle. The snails that survive the winter grow and reproduce from late March until the end of June when they reach their maximum size and die off. Their offspring (the spring generation) grow throughout the spring and the summer and reproduce briefly near the end of August. In the fall, the survivors from the spring generation and their offspring hibernate from November until the end of March. Snails mate by shell-mounting. In 89% of pairs, mating was anatomically reciprocal. During courtship, one snail climbs on the shell of a prospective mate and circles the shell to initiate mating. In mating pairs with a shell length difference of more than 1 mm, the smaller snail was always on top. This suggests that one function of shell-circling during courtship may be to help the top snail judge its potential partner's size. Source

Comparison of the shells of a land snail collected in Montreal, Canada with those of several North American and European Discus species resulted in the identification of the Montreal specimens as the European Discus rotundatus. © 2012 Check List and Authors. Source

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