Research Article |
Corresponding author: Min Wu ( minwu1969@aliyun.com ) Academic editor: Frank Köhler
© 2020 Zhe-Yu Chen, Min Wu.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Chen Z-Y, Wu M (2020) Two new cyclophoroid species from Hubei, China, with proposal of a new genus (Gastropoda, Caenogastropoda, Diplommatinidae and Alycaeidae). ZooKeys 935: 37-46. https://doi.org/10.3897/zookeys.935.51414
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Two new species, Sinoarinia feii Chen, gen. et sp. nov. and Pincerna vallis Chen & Wu, sp. nov., are described from western Hubei, China. The new genus Sinoarinia Chen & Wu, gen. nov. is established based on the strongly constricted penultimate whorl and the ascending last whorl. The Vietnamese species Pincerna costulosa (Bavay & Dautzenberg) is newly reported from Yunnan, China. For comparison, photographs of the shells of closely related species are provided. A key to the known species of Sinoarinia gen. nov. is included.
new genus, new species, Pincerna, Sinoarinia
The malacofauna of western Hubei has usually been studied at some well-known localities along the Yangtze River, for example in Badong and Changyang (
Arinia H. Adams & A. Adams, 1856 (Diplommatinidae) is a speciose genus widely distributed in Southeast Asia (
Photographs of the shells and the habitats were taken using a Canon 5D Mark IV camera. The shells were measured with digital vernier calipers to the nearest 0.1 mm. Whorls were counted as described by
Abbreviations: a.s.l. – above sea level; D – shell breadth; H – shell height; HBUMM – mollusc collection of the Museum of Hebei University, Baoding, China;
Sinoarinia feii Chen, sp. nov.
Shell minute, dextral, thin, translucent, cylindrical. Penultimate whorl strongly constricted. Last whorl strongly ascending, covering part of penultimate whorl. Protoconch oblique. Apical whorls depressed, with strong or weak ribs. Aperture rounded; peristome double, expanded but not reflected. Columellar lamella not visible from aperture but internally present; one parietal lamella and one palatal plica extending inwards from last whorl to penultimate whorl (in type species). Palatal plica visible through semitransparent parietal wall. Constriction absent or very weak where lamellae and plica terminate. Umbilicus closed, forming a chink.
Combination of the Latin prefix sino- (= China) with Arinia.
Southern China (Hubei, Guizhou), northern Vietnam.
The new genus can be distinguished from the sympatric diplommatinid genera (Arinia, Diplommatina Benson, 1849 and Gastroptychia Kobelt & Möllendorff, 1900) by its constricted penultimate whorl and the ascending last whorl (
Three species, Arinia mirifica Li, Zhuo & Luo, 2005, A. maolanensis Zhang, Chen & Zhuo, 2013, and Diplommatina aesopus Bavay & Dautzenberg, 1904, which some authors currently assign to Arinia (
Sinoarinia aesopus (Bavay & Dautzenberg, 1904) comb. nov., Sinoarinia feii Chen sp. nov., Sinoarinia maolanensis (
华阿勇螺属
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.
Shell width = 1.6–1.7 mm, shell height = 2.4–2.7 mm (n = 4).
Shell minute, cylindrical and apically flat. Penultimate whorl strongly constricted. Columellar lamella, one parietal lamella and one palatal plica present.
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.
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.
This name honors the herpetologist, Prof. Liang Fei, who encouraged the first author to carry out the research work.
China, Hubei, Wufeng Tujiazu Autonomous County, Chaibuxi National Forest Park, 30.216N, 110.199E, 1220 m a.s.l.
This species is known only from the type locality.
Sinoarinia maolanensis (
A Sinoarinia feii Chen, gen. et sp. nov. (HBUMM 10016-spec. 1, holotype) (Photos: Zhe-Yu Chen) B Sinoarinia maolanensis (
费氏华阿勇螺
1 | Shell height greater than 3 mm |
S. aesopus (Bavay & Dautzenberg, 1904) (Fig. |
– | Shell height less than 3 mm | 2 |
2 | Whorls fewer than 5. Shell width / shell height approximately 0.9 |
S. mirifica ( |
– | Whorls more than 5. Shell width / shell height approximately 0.5–0.7 | 3 |
3 | Shell height greater than 2 mm. Shell ribs strong |
S. feii Chen sp. nov. (Fig. |
– | Shell height less than 2 mm. Shell ribs weak |
S. maolanensis ( |
Alycaeus (Pincerna) liratula Preston, 1907, by monotypy (
平沟螺属
Holotype
(HBUMM10017-spec. 1, fully mature animal), 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.
Measurements. Shell width = 3.3 mm, shell height = 3.5 mm.
Diagnosis. R3 with some ribs. Ribs on R2 more intensive than those in P. costulosa.
Description. Shell conical ovoid, orangish when fresh, with 3¼–3½ convex whorls. Suture deep. Protoconch finely granulate, 1–1¾ whorls. R1 ca 2½ whorls, with regularly spaced strong ribs. R2 very short (ca 0.5 mm), consisting of ca 15 lighter stripes (= breathing tunnels); constriction between R2 and R3 rather shallow. R3 slightly less than ¼ whorl, smooth near R2 side, with about 5 weak but distinct ribs near aperture. Aperture rounded, nearly vertical, not descending. Peristome expanded but not reflected, internally thickened, protruding; boundary between inner and outer peristomes visible. Umbilicus open, narrow. Operculum (Fig.
A, B Pincerna vallis Chen & Wu, sp. nov. A HBUMM 10017-spec. 1, holotype, red arrow shows the operculum B HBUMM 10017-spec. 2, paratype C, D Pincerna costulosa (Bavay & Dautzenberg, 1912) C HBUMM10018 D syntype,
Etymology. The name vallis (Latin: valley) refers to the type locality inside the Chaibuxi Grand Canyon.
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. Two Pincerna species have been recorded in adjacent areas, P. costulosa (Bavay & Dautzenberg, 1912) from Vietnam (Holotype:
峡谷平沟螺
Alycaeus costulosus Bavay & Dautzenberg, 1912: 49–50, pl. 4, figs 1–4.
Pincerna costulosa
-
HBUMM10018 (Fig.
“Phong-Tho, Tonkin”.
Yunnan.
弱肋平沟螺
We thank Mr Xiao-Ran Zhu for collecting Pincerna specimen from Yunnan. Dr Barna Páll-Gergely is appreciated for sending necessary literature. Thanks go to Dr Eike Neubert and Dr. Páll-Gergely for their helpful comments on the manuscript. This study was supported by the National Natural Science Foundation of China (NSFC 31872196).