Bouchetcamaena foveata Pall-Gergely, 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 foveata Pall-Gergely sp. nov.

Figure 11

Type material.

Holotype: Khasia Hills [Meghalaya, India], 183, Assam, coll. Godwin-Austen, NHMUK 20191130/2 (D: 20.5 mm, 9.1 mm, mixed lot with B. fasciatus : NHMUK 20191130/1).

Paratypes: Assam, coll. C. Bosch ex coll. H. Rolle, SMF 297336 (2 paratypes, labelled as Bouchetcamaena delibrata Bouchetcamaena delibrata f. major ); Assam: Chenapoongu, coll. Jetschin ex coll. Gude 1900, SMF 91157 (2 paratypes); Assam: Khasia Hills, coll. C. Bosch ex coll. H. Rolle ex coll. Schlüter, SMF 297335 (2 paratypes); (1) Khasi Hills, Assam, (2) Burma, A.S. Kennard coll., Acc. No. 1824, NHMUK 20191136/2 (2 paratypes, mixed lot with B. procumbens : NHMUK 20191136/1, the Khasi Hills probably refers to Bouchetcamaena foveata , whereas Burma refers to Bouchetcamaena procumbens ); India, NHMUK 1871.9.23.99/2 (1 paratype, mixed lot with B. delibrata : NHMUK 1871.9.23.99/1); India, Laity (?) valley, H.F./W.T. Blanford coll., acc. 1944, NHMUK 20191135 (2 paratypes); Khasi Hills, blue label, 13/II/00, NHMUK 20191140 (2 paratypes, shells corroded by Byrne’s disease); Khasi Hills, NHMUK 1920.1.28.12-13/2 (1 paratype, mixed lot with B. delibrata : NHMUK 1920.1.28.12-13/1); Nemotha, blue label, 7/3/91, NHMUK 20191139 (2 paratypes).

Diagnosis.

Shell relatively large, fragile, thin-walled, dorsal side flat or even slightly sunken, colour light yellow to whitish, with a faint peripheral band; hair scars represented as elevated knobs (like strawberry seeds), or even hair scars represented as truncated hairs or short, slender, pointed hairs; aperture oval, umbilicus relatively narrow.

Description.

Shell medium-sized to large, thin-walled; dorsal side flat or even sunken; basic colour light yellowish to whitish, a peripheral band of various thickness present in all specimens, running around the shoulder or the body whorl; protoconch consisting of 1.50-1.75 whorls, finely wrinkled and covered by widely-spaced hair scars reminiscent of strawberry seeds; entire shell consisting of slightly less or more than 3.75-4 whorls, separated by a relatively deep suture; teleoconch very finely and irregularly wrinkled; hair scars (reminiscent of strawberry seeds) widely-spaced, clearly visible on the entire teleoconch; occasionally (near suture, behind expanded peristome, inside umbilicus, etc.) short, slender, pointed hairs remaining; hairs inside umbilicus denser than elsewhere on the teleoconch; aperture oval/subrectangular; peristome strongly expanded and slightly reflected, especially in direction of umbilicus; palatal part with thin, whitish, semi-transparent layer, which allows hair scars of penultimate whorl to be seen; umbilicus open, normally wide, funnel-shaped, peri-umbilical keel blunt.

Measurements.

D = 20.3-20.5 mm, H = 9.1-10.5 mm (n = 3).

Differential diagnosis.

This new species differs from that which is the most similar, B. delibrata , in having a flatter dorsal side, glossier shell, and deep hair scars on the entire surface. The hair scars of B. subdelibrata sp. nov. are much finer and denser on the entire shell surface.

Etymology.

The new species is named after its conspicuously pitted (= foveatus in Latin) surface.

Distribution.

All samples with relatively precise localities were collected in the Khasi Hills.

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 11. Bouchetcamaena foveata Pall-Gergely sp. nov., holotype (NHMUK 20191130 / 2). For positions of close-up images see Fig. 6 (F = DM, G = CA, H: LV, I: PC).