Terrestrial molluscs of Pemba Island, Zanzibar, Tanzania, and its status as an " oceanic " island Author Rowson, B Author Warren, B. H. Author Ngereza, C. F. text ZooKeys 2010 70 1 39 http://dx.doi.org/10.3897/zookeys.70.762 journal article http://dx.doi.org/10.3897/zookeys.70.762 1313-2970-70-1 17. Allopeas gracile (Hutton, 1834) Bulimus gracile Hutton 1834 : 84, 93 Notes. Pemba specimens reach a large size (13.5 x 3.4 mm, occasionally 15.0 x 3.5 mm, up to 8 whorls), always being relatively narrower than Opeas lamoense . The maximum size is substantially greater than given by most authors (e.g. Gerlach 2006b : 9.4 mm; Griffiths and Florens 2006 : 13.5 mm). Said to be restricted to "waste places" by Verdcourt (2000) this species nonetheless occurs in some forest habitats (Table 2). Allopeas gracile is widespread in the tropics but its native range is uncertain. Voeltzkow (1923) noted that " Opea gracile johanninum (Mor.)" (sic) was numerous in rotting logs on Pemba; Haas (1929) gives the record from Chake Chake. Fischer-Piette and Vukadinovic (1974) consider Bulimus johanninus Morelet, 1877, described from the Comoros, a synonym of Allopeas gracile . Recent authors (e.g. Neubert 1998 , Gerlach 2006b , Griffiths and Florens 2006 ) rather than Verdcourt (2006) and Rowson (2007) are followed here in treating this species in Allopeas as distinct from Lamellaxis .