Oospira xinxingae Qiu, 2022

Oospira xinxingae Qiu View in CoL , sp. nov.

( Fig. 1 -4)

ZooBank:http://zoobank.org/ 8F128E21-3670-408F-AADC-4FA274A22669

Holotype, empty shell and separated ethanol-preserved soft body ( MYNU 00022 ), “ 2022.VI.27 ffl ± ẌD ¨ ŔƜĶ " ŘNJ ″ ffiû 490m ®

º,Ɨ Ṅ ⁂” [27. VI.2022, Baqiao Diecui viewing platform, Jigongshan

hill, Beibei District, Chongqing City, 490m, Lu Qiu & Yi-Shu Wang leg.].

Paratypes

– 8 empty shells (6/ MYNU 00023-00028 , 2 / XXLC) and separated ethanol-preserved soft bodies (8/ MYNU), same data as holotype ;

– 1 empty shell ( MYNU 00029), “ 2020.XI.7 ffl ± ẌDṪBḾffiữŀ

ḾẼTḾā″813- 400m ® º, Ḅ ỂḆ” [7.XI.2020, Shangxia

Reviewers:

Ze-Yu Chen ( College of Food Science and Engineering, Wuhan Polytechnic University, China) - Orcid: https://orcid.org/0000-0002-4150-8906 down to Xiaxia, Jindaoxia Valley Scenic Spot, Beibei District, Chongqing City, 813- 400m, Lu Qiu & Xin-Xing Luo leg.];

– 2 empty shells ( MYNU 00030-00031 ), same data as the paratype MYNU 00029 , except the collecting date: “ 2020.XI.14 ” ;

– 3 empty shells (2/ MYNU 00032-00033 , 1 / XXLC) and 1 separated ethanol-preserved soft body ( MYNU), same data as the paratype MYNU 00029 , except the collecting date and collector:“ 2021.V.1, Xin-Xing Luo” .

Diagnosis. – A medium-sized Oospira species with thick apex, superior lamella separated or weakly connected with spiral lamella. Inferior lamella visible through aperture, steeply descending. Subcolumellar lamella not visible through aperture. Principal plica initiates ventrolaterally and extending laterally, not reaching peristome. Five to seven clearly palatal plicae.

Comparison. – Oospira xinxingae sp. nov. differs from most other Chinese congeners by its thick apex in shell. The most comparable Oospira in Beibei District is Oospira magnaciana , both species are similar in coloration, five to seven palatal plicae and the steeply descending inferior lamella. However, the new species markedly differs from O. magnaciana by its thick apex (while it’s tapered in O. magnaciana ), the disconnected or weakly connected between superior lamella and spiral lamella (while markedly connected between the two lamellae in O. magnaciana ), invisible subcolumellar lamella through aperture (while visible through aperture in oblique view in O. magnaciana ); the slender penis and epiphallus (while moderate long and thick penis and epiphallus in O. magnaciana ).

Description

Measurements (mm).

–Shell height: 19.0–24.6 (mean: 21.8);

–Shell width: 4.5–5.6 (mean: 5.1);

–Aperture height: 4.2–5.1 (mean: 4.7);

–Aperture width: 3.3–3.8 (mean: 3.6).

Shell ( Fig.1). – Medium-sized, sinistral, chestnut tolight brown,withstout apical part, consisting of 8½ to 11½ whorls. Protoconch of 3½ whorls, glossy, lighter in color. Teleoconch spindle-shaped, body whorl and penultimate whorl same in width; surface generally smooth, with indistinctly small spiral lines, weak ribs present near the neck. Aperture white, some individuals with brown hue, slightly narrower than the width of the body whorl, oval-piriform. Peristome thick, expanded and slightly reflexed, detached to the body whorl. Superior lamella ( Fig. 2) short, disconnected or weakly connected with spiral lamella, in one line. Spiral lamella ( Fig. 2) stronger at lateral side, ending ventrally. Inferior lamella visible through aperture, steeply descending, its end slightly shorter than the end of spiral lamella. Subcolumellar lamella ( Fig. 2) not visible through aperture, its end shorter than the end of spiral lamella, but slightly longer than inferior lamella. Lamellae formula: v–vl–>vl. Principal plica initiates ventrolaterally and extending laterally, not reaching peristome. Five to seven distinct, parallel palatal plicae; uppest palatal plica longer than other lower plalatal plicae.Clausilium plate in oblique view partly visible.

Genitalia ( Fig. 3). – Penis moderately long, thickened, simple outside. Penial pilasters visible through the wall. Epiphallus fusiform, thickened and slightly short that penis. A distinct muscleless zone between penis and epihallus present, approximately two times longer than the penis. Penial retractor muscle situated at the middle of epiphallus. Diverticulum long, adherent to spermoviduct, apex rounded. Bursa copulatrix ellipsoid (bursa copulatrix missing in holotype, this character was observed from paratypes).

Etymology. – Named after Xin-Xing Luo (Southwest University, Chongqing), who firstly discovered this new species together with the author in Jindaoxia.

Distribution. – China (Chongqing).

Ecology. – This species mainly inhabits in the Karsts of Beibei District. It can be found in the deep, wet Jindaoxia Valley ( Fig. 4 View Fig a-b), or the limestone area of Jigongshan ( Fig. 4 View Fig c-d).