Sinoarinia feii Chen, gen. et, 2020

Chen, Zhe-Yu & Wu, Min, 2020, Two new cyclophoroid species from Hubei, China, with proposal of a new genus (Gastropoda, Caenogastropoda, Diplommatinidae and Alycaeidae), ZooKeys 935, pp. 37-46 : 37

Sinoarinia feii Chen, gen. et sp. nov. Figures 1 , 2A , 3 , 5B

Type material.

Holotype (HBUMM 10016-spec. 1), China, Hubei, Wufeng Tujiazu Autonomous County, Chaibuxi National Forest Park, 30.216N, 110.199E, 1220 m a.s.l., leg. Zhe-Yu Chen and Qiao-Zhen Hu, 27 June 2019 (Fig. 5B ). Paratypes: 4 ex. (HBUMM 10016-spec. 2-5), same data as holotype.

Measurements.

Shell width = 1.6-1.7 mm, shell height = 2.4-2.7 mm (n = 4).

Diagnosis.

Shell minute, cylindrical and apically flat. Penultimate whorl strongly constricted. Columellar lamella, one parietal lamella and one palatal plica present.

Description.

Shell minute, dextral, cylindrical, translucent, with 5½ whorls. Shell suture depressed. Protoconch oblique, with no obvious sculpture. Upper whorls depressed. Penultimate whorl so strongly constricted that ½ whorl is invisible. Last whorl strongly ascending, dorsally covering part of penultimate whorl. Ribs strong and sharp, concentrated around umbilical region. Aperture rounded. Peristome double, expanded but not reflected. Angular protrusion weakly present near basal columella. Columellar lamella invisible from aperture, but stronger at penultimate whorl. One parietal lamella and one palatal plica extending from last whorl to penultimate whorl (Fig. 3 ). Palatal plica visible through semi-transparent parietal wall; obvious constriction absent or very weakly bulged at dorsal side of penultimate whorl. Umbilicus closed, chink-shaped. Operculum unknown.

Etymology.

This name honors the herpetologist, Prof. Liang Fei, who encouraged the first author to carry out the research work.

Type locality.

China, Hubei, Wufeng Tujiazu Autonomous County, Chaibuxi National Forest Park, 30.216N, 110.199E, 1220 m a.s.l.

Distribution.

This species is known only from the type locality.

Remarks.

Sinoarinia maolanensis ( Zhang et al. 2013) is morphologically similar, but differs in having a larger shell with stronger ribs (Fig. 2B ). Sinoarinia mirifica ( Li et al. 2005) can be distinguished by its stout shape of shell, sparser ribs, shorter and fewer whorls, and in that the last whorl covers the penultimate whorl dorso-laterally (Fig. 2C ) (in S. feii gen. et sp. nov. the last whorl covers penultimate whorl dorsally).

Vernacular name.

费氏华阿勇螺

Figures

Figure 1. Map of sampling sites and type localities 1 type locality of Sinoarinia feii Chen, gen. et sp. nov. and Pincerna vallis Chen & Wu, sp. nov. 2 type locality of Sinoarinia maolanensis (Zhang, Chen & Zhuo, 2013) comb. nov. 3 type locality of Sinoarinia mirifica (Li, Zhuo & Luo, 2005) comb. nov. 4 type locality of Pincerna costulosa (Bavay & Dautzenberg, 1912) and Sinoarinia aesopus (Bavay & Dautzenberg, 1904) comb. nov., Vietnam 5 Sampling site of Pincerna costulosa in Yunnan.

Figure 2. A Sinoarinia feii Chen, gen. et sp. nov. (HBUMM 10016 - spec. 1, holotype) (Photos: Zhe-Yu Chen) B Sinoarinia maolanensis (Zhang et al., 2013) comb. nov. (after Zhang et al. 2013) C Sinoarinia mirifica (Li et al., 2005) comb. nov. (after Li et al. 2005) D Sinoarinia aesopus (Bavay & Dautzenberg, 1904) comb. nov. (after Bavay & Dautzenberg, 1904). Scale bar: 1 mm, refers to A and B only.

Figure 3. Inner structure of Sinoarinia feii Chen, gen. et sp. nov. (HBUMM 10016 - spec. 5, paratype) (Photos: Zhe-Yu Chen). Abbreviations: par-parietal lamella, pal-palatal plica, cl-columellar lamella, green dotted line-constriction.

Figure 5. A Habitat of Pincerna vallis Chen & Wu, sp. nov. (HBUMM 10017 - spec. 1, holotype) B habitat of Sinoarinia feii Chen, gen. et sp. nov. Photos: Zhe-Yu Chen.