Bouchetcamaena delibrata (Benson, 1836) Páll-Gergely & Ablett & Szabó & Neubert, 2022

Pall-Gergely, Barna, Ablett, Jonathan D., Szabo, Marton & Neubert, Eike, 2022, Revision of the " Chloritis delibrata (Benson, 1836) " group (Gastropoda, Stylommatophora, Camaenidae), ZooKeys 1086, pp. 1-31 : 1

Bouchetcamaena delibrata (Benson, 1836) comb. nov.

Figures 7 , 8 , 9 , 10

Helix delibratus Benson, 1836: 352.

Chloritis (Trichochloritis) delibrata Gude, 1914: 172.

Chloritis delibrata Richardson, 1985: 92.

Chloritis delibrata Ramakrishna et al., 2010: 326.

Type locality.

"North-East frontier of Bengal".

Types examined.

UMZC 2387 (1 syntype).

Additional material examined.

Khasi Berge, coll. Möllendorff, SMF 27140 /1; Hinterindien, coll. Möllendorff, SMF 27141 (2 shells, mixed sample with another species); India, NHMUK 1871.9.23.99/1 (1 shell, mixed lot with B. foveata : NHMUK 1871.9.23.99/2); Khasi Hills, blue label 7/12/06, NHMUK 20191138 (1 shell); Khasi Hills, coll. Godwin-Austen, NHMUK 1903.7.1.381/2 (1 shell, mixed lot with B. fasciata , NHMUK 1903.7.1.381/1, this is the syntype lot of Burmochloritis fasciata ); Khasi Hills , coll. Godwin-Austen, no. 183, NHMUK 1903.7.1.381a/1 (1 shell, mixed lot with B. fusca : NHMUK 1903.7.1.381a/2); Khasi Hills , NHMUK 1920.1.28.12-13/1 (1 shell, mixed lot with B. foveata : NHMUK 1920.1.28.12-13/2); Munipur , coll. Godwin-Austen, NHMUK 1903.7.1.391/1 (1 shell, mixed lot with B. fusca : NHMUK 1903.7.1.391/2); Sibsagar , Assam, coll. Godwin-Austen, NHMUK 1909.3.15.23 (2 shells); South Sylhet Hills , coll. W Chennell, NHMUK 1903.7.1.61/1 (1 shell, mixed lot with B. subdelibrata : NHMUK 1903.7.1.61/2) .

Diagnosis.

Shell large, flat, olive green, glossy, last whorl practically without hair scars, or widely-spaced hair scars near the parietal callus, aperture oval.

Description.

Shell relatively large, rather thin-walled; depressed, dorsal side usually entirely flat, rarely very slightly elevated; colour greenish-olive to greenish-yellowish with an obscure, reddish band just above the blunt keel (rarely missing); protoconch consists of 1.75 whorls, with very fine radial ribs and regularly arranged hair scars (pits); entire shell with 4 whorls; separated by a moderately deep suture; teleoconch overall glossy, with irregular, fine growth lines, dorsal side of first 2.0-2.5 whorls covered by widely-spaced hair scars (= pits), and short hairs near suture; ventral side of body whorl without hair scars or widely spaced (in some specimens somewhat denser than in others) pits near the parietal callus only; aperture oval/subrectangular; peristome strongly expanded and slightly reflected in direction of umbilicus; palatal part with very thin, whitish, semi-transparent layer, showing hair scars on penultimate whorl; umbilicus open, relatively wide, funnel-shaped, peri-umbilical keel only very slightly indicated.

Measurements.

D = 21.4-24.4 mm, H = 9.2-10.3 mm (n = 4).

Differential diagnosis.

Bouchetcamaena subdelibrata sp. nov. differs from B. delibrata mainly in the presence of hair scars on the entirety of the last whorl. For further differences, see under that species.

Distribution.

This species is apparently widespread in the southwestern Himalaya (Khasi Hills, Manipur, Silhet).

Figures

Figure 6. Positions of close-up images. Abbreviations: CA: callus; DM: middle of dorsal side; LV: last whorl; PC: protoconch. Not to scale.

Figure 7. Bouchetcamaena delibrata (Benson, 1836), comb. nov. UMZC 2387 (syntype).

Figure 8. Bouchetcamaena delibrata (Benson, 1836), comb. nov. NHMUK 1903.7.1.381. For positions of close-up images see Fig. 6 (F = DM, G = CA, H: LV, I: PC).

Figure 9. Bouchetcamaena delibrata (Benson, 1836), comb. nov. A-E NHMUK 1903.7.1.61 F-J 1903.7.1.381. a.

Figure 10. Bouchetcamaena delibrata (Benson, 1836), comb. nov. A-E NHMUK 1920.1.28.12 - 13 F-J NHMUK 23 - iii- 15.