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Gekko cib LYU, LIN, REN, JIANG, ZHANG, QI & WANG, 2021

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common NamesE: CIB Gecko (“CIB” pronounced as “/si:/, /aɪ/, /bi:/”)
Chinese: chéng dű bì hŭ (成都壁虎) 
SynonymGekko (Japonicgekko) cib LYU, LIN, REN, JIANG, ZHANG, QI & WANG 2021 
DistributionChina (Sichuan)

Type locality: wall surface in the Herpetological Museum, Chengdu Institute of Biology, Chinese Academy of Sciences (30.632093°N, 104.068917°E; ca 500 m a.s.l.), Chengdu City, Sichuan Province, PR China  
Reproduction 
TypesHolotype. CIB 116961 (Fig. 7), adult male, collected by Jin-Long Ren on 14 July 2018. Paratypes. Two adult male and eight adult female specimens. Females CIB 116962–116963 collected by Jin-Long Ren, Bo-Chen Zhao, and Zeng Wang on 28 June 2018 from Wenshu Temple (30.677950°N, 104.063181°E; ca 500 m a.s.l.), Chengdu City. Males SYS r002397–2398 and females SYS r002395–2396 collected by Zhi-Tong Lyu and Shuo Qi on 22 October 2019 from Chengdu City. Female SYS r000708 collected by Jian-Huan Yang on 5 June 2012 from Qingyinge, Mt. Emei (28.575478°N, 103.405444°E; ca 760 m a.s.l.), Emeishan City, Sichuan Province. Female SYS r001489 collected by Zhi-Tong Lyu on 16 June 2016 from Shunyangxi, Zihuai Township (28.628283°N, 106.298241°E; ca 800 m a.s.l.), Hejiang County, Sichuan Province. Females CIB 116964–116965 collected by Di-Hao Wu on 13 July 2017, from Shacuoluo, Malu Township (27.639252°N, 105.819409°E; ca 900 m a.s.l.), Jinsha County, Guizhou Province, PR China. 
DiagnosisDiagnosis. Gekko (Japonicgekko) cib sp. nov. is distinguished from all congeners by the following morphological characteristics: (1) medium-sized gecko species, SVL 46.9–66.4 mm in adults; (2) tubercles on dorsal body, limbs and tail absent; (3) eye large, ED/HL ratio 0.21–0.28; (4) rostral moderate, RW/HW ratio 0.19–0.24, RW/RH ratio 1.79–2.17 ; (5) mental elongate transversely, MW/HW ratio 0.13–0.18, MW/ML ratio 1.43–1.80; (6) nares bordered with rostral, internasals 1–2; (7) interorbital scales between anterior corners of the eyes 28–36; (8) midbody scale rows 128–149; (9) ventral scale rows at midbody 37–45; (10) scales between mental and cloacal slit 171–196; (11) subdigital lamellae on first fingers 8–13, on fourth fingers 10–15, on first toes 9–11, on fourth toes 10–15; (12) fingers and toes with distinct webbing; (13) 7–9 precloacal pores in a continuous row in males; (14) a single postcloacal tubercle on both sides; (14) dorsum greyish white to dark brown, with five regular dark bands between nape and sacrum (Fig. 6C).
Hemipenial characteristics (Fig. 3C): (1) hemipenis clavate, bilobed, densely covered with denticulate-seamed calyces; (2) sulcus spermaticus bifurcate at half of truncus; (3) lateral welt weakly developed, invisible from asulcate side, in contact with sulcus lip; (4) calyces confined to lobes and distal 1/2 of truncus; (5) tongue-like welt large; (6) apical folds large, comma-shaped, not in contact with each other; (7) a small and boomerang-like area on the asulcate side of the lobe center, calyces on this area not well developed (Fig. 3C, Ch 7).

Comparisons. Gekko (Japonigekko) cib sp. nov. is compared with all 30 recognized species within the subgenus Japonigekko.
Gekko (Japonigekko) cib sp. nov. used to be recorded as G. (J.) subpalmatus. However, the new species can be distinguished from the true G. (J.) subpalmatus in eastern China by the following morphological characters: mentals more elongate transversely, MW/ML ratio 1.60 ± 0.12 (versus 1.36 ± 0.18); larger eyes, ED/HL ratio 0.23 ± 0.03 (versus 0.19 ± 0.01). In addition, G. (J.) cib sp. nov. differs from G. (J.) subpalmatus in the following distinct hemipenial characters (Table 3; Fig. 3), including having sulcus spermaticus bifurcate at half of the truncus length (vs. bifurcate at crotch of hemipenis), lateral welt of the base of the sulcus spermaticus weakly developed, in contact with sulcus lip (versus well developed, not in contact with sulcus lip), and a smaller ornamented area (calyces confined to lobes and distal 1/2 of truncus versus calyces extended to lobes and distal 2/3 of truncus).
Gekko (Japonigekko) cib sp. nov. is the sister taxon to G. (J.) melli from southern China, however, it differs in the appearance, dorsal body with regular patches (versus dorsal body with irregular enlarge patches), absence of an incomplete W-shaped marking on top of head (versus present), W-shaped marking on dorsal neck narrow (versus W-shaped marking on dorsal neck broad), and in the following data of scale counts: (1) fewer scales around the middle of the body, SR 128–149 (versus SR 147–160), (2) fewer precloacal pores in males, PP 7–9 (versus PP 9–11). Particularly, G. (J.) cib sp. nov. differs from G. (J.) melli in the following distinct hemipenial characters (Table 3; Fig. 3), including having lateral welt of the base of the sulcus spermaticus weakly developed, invisible from asulcate side (versus developed, visible from asulcate side); developed tongue-like welt (versus weakly developed); a smaller ornamented area (calyces confined to lobes and distal 1/2 of truncus versus calyces extended to lobes and distal 2/3 of truncus); and a protruded boundary between naked area and ornamented area on truncus (versus boundary smooth).
Gekko (Japonigekko) cib sp. nov. can be easily distinguished from the following 19 congeners by lacking dorsal tubercles: G. (J.) adleri Nguyen, Wang, Yang, Lehmann, Le, Ziegler & Bonkowski, 2013, G .(J.) auriverrucosus Zhou & Liu, 1982, G. (J.) canhi Rösler, Nguyen, Van Doan, Ho, Nguyen & Ziegler, 2010, G. (J.) chinensis (Gray, 1842), G. (J.) hekouensis Pope, 1928, G. (J.) japonicus (Schlegel, 1836), G. (J.) kwangsiensis Yang, 2015, G. (J.) lauhachindai Panitvong, Sumontha, Konlek & Kunya, 2010, G. (J.) liboensis Zhou, Liu & Li, 1982, G. (J.) palmatus Boulenger, 1907, G. (J.) scabridus Liu & Zhou, 1982, G. (J.) shibatai Toda, Sengoku, Hikida & Ota, 2008, G. (J.) similignum Smith, 1923, G. (J.) swinhonis Günther, 1864, G. (J.) taibaiensis Song, 1985, G. (J.) vertebralis Toda, Sengoku, Hikida & Ota, 2008, G. (J.) vietnamensis Sang, 2010, G. (J.) wenxianensis Zhou & Wang, 2008, and G. (J.) yakuensis Matsui & Okada, 1968.
Furthermore, the new species can be distinguished from the following three Gekko (Japonigekko) congeners by having only a single postcloacal tubercle on both sides (versus PAT 2–2 in G. (J.) sengchanthavongi Luu, Calame, Nguyen, Le & Ziegler, 2015, and G. (J.) thakhekensis Luu, Calame, Nguyen, Le, Bonkowski & Ziegler, 2014; PAT 2–3 in G. (J.) scientiadventura Rösler, Ziegler, Vu, Herrmann & Böhme, 2004).
For the remaining six subgeneric congeners, by having 7–9 precloacal pores in males, Gekko (Japonigekko) cib sp. nov. can be distinguished from G. (J.) aaronbaueri Tri, Thai, Phimvohan, David & Teynié, 2015 (PP 3–4), G. (J.) bonkowskii Luu, Calame, Nguyen, Le & Ziegler, 2015 (PP 6), G. (J.) nadenensis Luu, Nguyen, Le, Bonkowski & Ziegler, 2017 (PP 6), G. (J.) tawaensis Okada, 1956 (PP 0), and G. (J.) truongi Phung & Ziegler, 2011 (PP 10–11); by having 1–2 intersupranasals, the new species can be distinguished from G. (J.) bonkowskii and G. (J.) nadenensis, both of which have no intersupranasals; and by having 5 dark bands between nape and sacrum on dorsum, G. (J.) cib sp. nov. further differs from G. (J.) guishanicus Lin & Yao, 2016 (dorsum with 6 dark bands). 
CommentNote that the subgenus should be Japonigekko. 
EtymologyThe specific name cib (pronounced as “/kib/”) is in reference to the abbreviation of the type locality, Chengdu Institute of Biology, Chinese Academy of Sciences (中国科学院成都生物研究所). Chengdu Institute of Biology is a famous institute with a long and prestigious history in China, cultivating a large number of outstanding herpetologists and promoting the development of Chinese herpetology. 
References
  • LYU, Z. T., LIN, C. Y., REN, J. L., JIANG, K., ZHANG, Y. P., QI, S., & WANG, J. 2021. Review of the Gekko (Japonigekko) subpalmatus complex (Squamata, Sauria, Gekkonidae), with description of a new species from China. Zootaxa 4951(2): 236-258 - get paper here
 
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