Perrottetia Kobelt, 1905

Sian Man, Nem, Siriboon, Thanit, Lin, Aung, Sutcharit, Chirasak & Panha, Somsak, 2022, Revision of the carnivorous land snail family Streptaxidae (Stylommatophora, Achatinina) in Myanmar, with description of four new species, ZooKeys 1110, pp. 39-102 : 39

Genus Perrottetia Kobelt, 1905

Odontartemon (Perrottetia) Kobelt, 1905: 91. Kobelt 1906: 108. Thiele 1931: 730. Forcart 1946: 215.

Oophana (Perrottetia) - van Benthem Jutting 1954: 95.

Perrottetia - Zilch 1960: 562, 563. Richardson 1988: 237. Schileyko 2000: 777, 778. Siriboon et al. 2013: 44, 45.

Type species.

Helix perrotteti Petit, 1841 by subsequent designation by Forcart (1946: 215).

Diagnosis.

Shell oblique-heliciform, and translucent. Longitudinal furrows present behind apertural lip. Apertural dentition usually consists of two parietal, one palatal, one basal and one columellar lamella, and upper palatal and supracolumellar lamellae may be present. Genitalia with long and slender penis, penial sheath thin and not extending the entire penis length. Penial hooks dense, pale brown, expanded at base, with pointed tips, located on penial papillae, and curved towards genital orifice. Vaginal hooks may be present.

Remarks.

Perrotettia and Discartemon are generally similar in having complex apertural dentition; however, their shell morphology is obviously different. Perrottetia has a sub-heliciform shell, smaller size, last whorl rounded and more or less deflected, and mostly with two parietal lamellae. Although parietal, palatal, basal and columellar lamellae are always present in Perrottetia , possession of second parietal, upper palatal and supracolumellar lamellae is variable, as is the presence of bifid lamellae ( Siriboon et al. 2013; Inkhavilay et al. 2016; Bui et al. 2019). In contrast, Discartemon exhibits flattened to globose-heliciform shells, last whorl rounded to angular and less deflected with, usually, one parietal lamella.

Nonetheless, some Discartemon species from Thailand have two parietal lamellae, for example, D. afthonodontia (see Siriboon et al. 2014a: fig. 7a, b) and D. flavacandida (see Siriboon et al. 2014a: fig. 7e, f). Likewise, some Perrottetia species are also described with only a single parietal lamella, for example, the Vietnamese species P. aberrata (Souleyet, 1852) and P. namdongensis Bui & Do, 2019 (see Bui et al. 2019: figs 2c-e, 3a-c), and the Laos species P. unidentata Inkhavilay & Panha, 2016 (see Inkhavilay et al. 2016: fig. 5f-i).

At present, the genus Perrottetia is comprised of about 30 nominal species distributed from India and Sri Lanka to Indochina and southern China ( Kobelt 1906; Richardson 1988; Schileyko 2011; Siriboon et al. 2013; Inkhavilay et al. 2016). So far, P. theobaldi Benson, 1859 is the only species known from Myanmar.