Bakyietaia avisvenatoris Yen, Zhang & von Rintelen gen. et sp. nov.

urn:lsid:zoobank.org:act: DE6AD35F-6629-4C6B-A180-F4C1298C0DDB

Figs 26–27

Diagnosis

Shell small to large (19.78–27.84 mm) thin, sturdy, conical, shoulder angular, whorls inflated, prominent keel above suture, outer lip angular; columellar lip recurved, forming callus covering umbilicus completely; operculum with small nuclear region (around 1/4 of inner opercular region) with shiny grains or veins; outer marginal tooth of radula with 24–27 small sharp cusps.

Etymology

In memory of one of the ancestors of the collector of the type material, who was a bird hunter and moved to the type locality due to the abundance of birds there. The recommended Chinese name is 猎^ṉ田ª.

Material examined

Holotype

CHINA • spec. preserved in ethanol; Guangdong Province, Guangzhou City, Zengcheng District, Paitan Town, a pond in Shi Village; 18 Jun. 2020; Da-Ming Shi leg.; KIZ.240020.

Paratypes

CHINA – Guangdong Province • 2 specs (preserved in ethanol); same data as for holotype; KIZ.240021, KIZ.240022 • 1 spec. (preserved in ethanol); same data as for holotype; ZMB.122757 • 1 spec. (preserved in ethanol); same data as for holotype; KIZ.240095. – Guangxi • 2 specs (preserved in ethanol); Yulin City, Luchuan County, Wangsha Village, Shuikou, 0.4 m deep on mud substrate or rock; 15 Nov. 2019; Bei-Hua Liang leg.; KIZ.240023, KIZ. 240055 • 1 spec. (preserved in ethanol); same data as for preceding; ZMB.122698 • 1 spec. (preserved in ethanol); same data as for preceding; KIZ.240096 • 2 specs (preserved in ethanol); Yulin City, Luchuan County, Wangsha Village, Baishiling, 0.4 m deep on mud substrate or rock; 15 Nov. 2019; Bei-Hua Liang leg.; KIZ.240052, KIZ.240053.

Other material

CHINA – Guangxi • 1 spec. (preserved dry); Yulin City, Luchuan County, Wangsha Village, Shuikou, 0.4 m deep on mud substrate or rock; 15 Nov. 2019; Bei-Hua Liang leg.; YHY-BAKAVI-SK-4 • 1 spec. (preserved dry); Yulin City, Luchuan County, Wangsha Village, Baishiling, 0.4 m deep on mud substrate or rock; 15 Nov. 2019; Bei-Hua Liang leg.; YHY-BAKAVI-BSL-15.

Description

Adult shell (Fig. 26A–E, J–Q) small to large (19.78–27.84 mm), thin but sturdy, conical, olive to olive brown, with five whorls, apex acute; teleoconch whorls sometimes with shoulder, with three relatively weak and smooth primary keels, with one to two weaker smooth secondary keels located between suture and first keel, sometimes one additional weak keel located between first and second/second and third keels, base of shell with one to three weak keels, all keels usually darker than rest of shell surface, prominent keel above suture; aperture ovate, less than half of shell in height, inner shell surface bluish white, outer lip thin, always with a strong angular periphery,, columellar lip covered with thin inner shell layers, white, columellar lip outward folding, completely or partly covering umbilicus.

Operculum (Fig. 26F–I) corneous, ovate, relatively thin, yellow to red; exterior surface smooth; interior surface with small nuclear region, around 1/4 of inner opercular region, with shiny grains or veins or smooth glossy surface.

Radular (Fig. 27) (n = 2) central tooth with one broad central denticle and four to five small sharp cusps on either side; lateral tooth with one broad central denticle and four to five small sharp cusps on either side; inner marginal tooth narrow, about half of lateral tooth in width, with one broad central denticle and three to four small sharp cusps on either side; outer marginal tooth wide, almost same width as lateral tooth, with 24 to 27 small sharp cusps.

Remarks

Bakyietaia avisvenatoris gen. et sp. nov. can be distinguished from most of its congeners based on its thin conical shell with inflated whorls, angular shoulder and strongly keeled suture. This species can be differentiated from Bakyietaia indrapura gen. et sp. nov. from Central Vietnam based on its less inflated whorls and less prominent keel at suture. The distributions of these two species are far apart.

Habitat and distribution

Mud substrate or rock in the shallow water of ponds and creeks in eastern Guangxi and central Guangdong Province, China.