A peer-reviewed open-access journal Zookeys 935: 37-46 (2020) as ROE ae fee #ZooKeys https:/ / ZOO keys. pensoft.net Launched to accelerate biodiversity research Two new cyclophoroid species from Hubei, China, with proposal of a new genus (Gastropoda, Caenogastropoda, Diplommatinidae and Alycaeidae) Zhe-Yu Chen!?, Min Wu? I College of food science and engineering, Wuhan Polytechnic University, Wuhan 430023, China 2 School of Life Sciences, Nanjing University, Xianlindadao 163, Nanjing 210023, China Corresponding author: Min Wu (minwu1969@aliyun.com) Academic editor: F. Kéhler | Received 23 February 2020 | Accepted 3 April 2020 | Published 21 May 2020 http://zoobank. org/EO9A085.D-F716-40DE-9B24-3E1E0BCO1 BAO 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 Abstract 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 spe- cies 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. Keywords new genus, new species, Pincerna, Sinoarinia Introduction The malacofauna of western Hubei has usually been studied at some well-known lo- calities along the Yangtze River, for example in Badong and Changyang (Heude 1882, 1885, 1890; Yen 1939). In the region farther south, which encompasses vast areas of limestone mountains, the land snail fauna is still poorly known. During a short faunal survey in Wufeng (Tujiazu Autonomous County) in summer 2019, we found Copyright 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. 38 Zhe-Yu Chen & Min Wu / ZooKeys 935: 37-46 (2020) two cyclophoroid species new to science, namely Sinoarinia feii Chen gen. et sp. nov. (Diplommatinidae) and Pincerna vallis Chen & Wau, sp. nov. (Alycaeidae). Arinia H. Adams & A. Adams, 1856 (Diplommatinidae) is a speciose genus widely distributed in Southeast Asia (Zilch 1953; Vermeulen 1996; Vermeulen et al. 2007; Pall-Gergely and Hunyadi 2018). Only three species of this genus were reported from China so far, namely Arinia cathaicola Pilsbry, 1934, Arinia mirifica Li, Zhuo & Luo, 2005, and Arinia maolanensis Zhang, Chen & Zhuo, 2013 (Pilsbry 1934; Li et al. 2005; Zhang et al. 2013). Based on our morphological studies of shells, we believed that A. mirifica and A. maolanensis, Diplommatina aesopus Bavay & Dautzenberg, 1904 from Vietnam, and S. feii sp. nov. belong to a distinct, undescribed genus. Methods 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 Kerney and Cameron (1979). The terminology to describe alycaeid shells (Regions 1-3) follows Pall-Gergely et al. (2017). Abbreviations: a.s.l. — above sea level; D — shell breadth; H — shell height; HBUMM - mollusc collection of the Museum of Hebei University, Baoding, China; MNHN - Muséum National d’Histoire Naturelle, Paris, France; RI (Region 1) — from the beginning of the teleoconch to the beginning of the differently ribbed region along the suture; R2 (Region 2) — the differently ribbed area before the constriction; R3 (Region 3) — from the constriction to the peristome. Systematics Diplommatinidae Benson, 1849 Sinoarinia Chen & Wu, gen. nov. http://zoobank.org/97E9 1 F22-0BD2-4A64-AGA9-2811065EDO0F4 Type species. Sinoarinia feii Chen, sp. nov. Diagnosis. 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. Aper- ture 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. Etymology. Combination of the Latin prefix sino- (= China) with Arinia. Distribution. Southern China (Hubei, Guizhou), northern Vietnam. New cyclophoroids from Hubei By) Gui @ zhou aus Fane tn Figure |. Map of sampling sites and type localities | 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. Remarks. The new genus can be distinguished from the sympatric diplommati- nid genera (Arinia, Diplommatina Benson, 1849 and Gastroptychia Kobelt & Méllen- dorff, 1900) by its constricted penultimate whorl and the ascending last whorl (Kobelt 1902; Zilch 1953; Vermeulen 1996; Vermeulen et al. 2007; Pall-Gergely and Hunyadi 2018). In general, Sinoarinia gen. nov. has a cylindrical shell, depressed apex, and deeply incised lamellae and plica, which differs from the conical shell with an exposed columellar lamella in Diplommatina and Gastroptychia. Arinia usually lacks internal apertural barriers (Kobelt 1902; Vermeulen 1996; Vermeulen et al. 2007), which are well developed in Sinoarinia gen. nov. The constricted structure of the new genus is similar to that found in the non-sympatric diplommatinid genus Diancta E. von Mar- tens, 1864, which differs from the new genus by its mostly sinistral coiling and conical 40 Zhe-Yu Chen & Min Wu / ZooKeys 935: 37-46 (2020) whorls as showed in Diancta (s. str.) (Neubert and Bouchet 2015), or by the con- stricted penultimate whorl which is not partially covered by the last whorl, as showed in Diancta (Paradiancta) Méllendorff, 1895 (Egorov 2013). 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 (Li et al. 2005; Zhang et al. 2013) and Diplom- matina (Bavay & Dautzenberg, 1904), are here transferred to Sinoarinia gen. nov. Included species. Sinoarinia aesopus (Bavay & Dautzenberg, 1904) comb. nov., Sinoarinia feii Chen sp. nov., Sinoarinia maolanensis (Zhang et al., 2013) comb. nov., and Sinoarinia mirifica (Li et al., 2005) comb. nov. Vernacular name. 4F:5#] lA) Sinoarinia feii Chen, gen. et sp. nov. http://zoobank.org/CD2C6088-75C0-430D-92CD-5BEB49BDO06E8 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 5% whorls. Shell suture depressed. Protoconch oblique, with no obvious sculpture. Upper whorls de- pressed. Penultimate whorl so strongly constricted that ¥2 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. Columel- lar 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 Na- tional 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 New cyclophoroids from Hubei 4] basses 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. 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. #¢ Fo 4E fa] 3 Key to the species of Sinoarinia gen. nov. 1 ete) UN seestadetieged cer'h col od oY elec of 061/06 RUE, UM cee BOT, LOM ek RD Op BL ee Rd Be AED S. aesopus (Bavay & Dautzenberg, 1904) (Fig. 2D) - Shellbheronelessathai-3 causes oe sneer et aaeet.cancr ona e asec adc tar eases eae 2 2: Whorls fewer than 5. Shell width / shell height approximately 0.9..........0..... tet Se At Sra Re Ube Sadi Soa S. mirifica (Li et al. 2005) (Fig. 2C) Whorls more than 5. Shell width / shell height approximately 0.5—0.7....... 3 42 Zhe-Yu Chen & Min Wu / ZooKeys 935: 37-46 (2020) 3 Shell theicht ereater than 2: Shell ribs-stron ge wi Aske. -anadenatbvsdaeanasia skeet ek erecta, rl ete eee rs AR A oR RR RO S. feii Chen sp. nov. (Fig. 2A) - Shelltheight less than.2 mim: Shell ribs weak... ccccroccesmneconnerscveee conssenecieee Var) ANP SW 90th rae S. maolanensis (Zhang et al. 2013) (Fig. 2B) Alycaeidae Blanford, 1864 Pincerna Preston, 1907 Type species. Alycaeus (Pincerna) liratula Preston, 1907, by monotypy (Pall-Gerge- ly 2017). Vernacular name. *Y-74) UA JE Pincerna vallis Chen & Wau, sp. nov. http://zoobank.org/63A4E5 19-86E7-453A-9F90-2EAAFE527 185 Figures 1, 4A, B, 5A Type material. 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. 5A). Paratype: | ex. (HBUMM 10017-spec. 2, an empty shell), same data as holotype. Measurements. Shell width = 3.3 mm, shell height = 3.5 mm. 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. New cyclophoroids from Hubei 43 Figure 4. 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 & Dautzen- berg, 1912) C HBUMM10018 D syntype, MNHN-IM-2000-31786. Scale bar: 5 mm. Photos: Zhe-Yu Chen (A=C) and M. Caballer Gutierrez (D). Diagnosis. R3 with some ribs. Ribs on R2 more intensive than those in P costulosa. Description. Shell conical ovoid, orangish when fresh, with 344-32 convex whorls. Suture deep. Protoconch finely granulate, 1-134 whorls. R1 ca 2% whorls, 44 Zhe-Yu Chen & Min Wu / ZooKeys 935: 37-46 (2020) Figure 5.A Habitat of Pincerna vallis Chen & Wu, sp. nov. (HBUMM 10017-spec. 1, holotype) B habi- tat of Sinoarinia feii Chen, gen. et sp. nov. Photos: Zhe-Yu Chen. with regularly spaced strong ribs. R2 very short (ca 0.5 mm), consisting of ca 15 light- er stripes (= breathing tunnels); constriction between R2 and R3 rather shallow. R3 slightly less than %4 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. 4A, arrowed) corneous, translucent, thin, concave. 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 Na- tional Forest Park, 30.216N, 110.199E, 1220 mazss.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: MNHN-IM-2000-31786, Tonkin, Phong Tho) (Fig. 4D) and Yunnan, China (HBUMM10018, see below) (Fig. 4C) and Pincerna maolanensis Luo, Zhang & Zhuo, 2009 from Guizhou. Pincerna vallis sp. nov. can be distinguished from P maolanensis by its smaller and more fragile shell, relatively short R2 (ca 0.5 mm, whereas it is 0.83-1.00 mm in P maolanensis). Pincerna costulosa is most similar to the new species in size and shape. However, P val- lis sp. nov. has a more convex body whorl. Pincerna costulosa has a smooth/ribless R3 while the new species has some ribs near the aperture. In addition, the ribs of P vallis sp. nov. on R2 are stronger than those in P costulosa. Vernacular name. |KKA-7 4 12 New cyclophoroids from Hubei 45 Pincerna costulosa (Bavay & Dautzenberg, 1912) Figures 1, 4C, D Alycaeus costulosus Bavay & Dautzenberg, 1912: 49-50, pl. 4, figs 1-4. Pincerna costulosa-Pall-Gergely et al. 2017: 10, fig. 3F. Materials examined. HBUMM10018 (Fig. 4C), Yunnan, Xishuangbanna, Menglun Botanical Garden, Lvshilin (21.911N, 101.283), leg. Xiao-Ran Zuu, 6 August 2018. Type locality. “Phong-Tho, Tonkin’. Distribution in China. Yunnan. Vernacular name. 55/74 Acknowledgements We thank Mr Xiao-Ran Zuu for collecting Pincerna specimen from Yunnan. Dr Barna Pall-Gergely is appreciated for sending necessary literature. Thanks go to Dr Eike NEv- BERT and Dr. Pall-Gergely for their helpful comments on the manuscript. This study was supported by the National Natural Science Foundation of China (NSFC 31872196). References Bavay A, Dautzenberg P (1904 [«1903»]) Description de coquilles nouvelles de PIndo-Chine (3e suite). 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