A new species of <i>Pareas</i> (Squamata: Pareidae) from southwestern Yunnan, China

Liu, Shuo; Li, Zhimin; Yang, Tong; Rao, Dingqi

doi:10.1590/S1984-4689.v42.e24068

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Research Article • Zoologia (Curitiba) 42 • 2025 • https://doi.org/10.1590/S1984-4689.v42.e24068 linkcopy

A new species of Pareas (Squamata: Pareidae) from southwestern Yunnan, China

Authorship SCIMAGO INSTITUTIONS RANKINGS

A new species of Pareas is described from Gengma County, Lincang City, Yunnan Province, China, based on morphological comparisons and phylogenetic analysis. The new species is phylogenetically closely related and morphologically similar to P. nigriceps and P. tigerinus. It can be distinguished from P. nigriceps and P. tigerinus and other congeners by a combination of the following characters: snout-vent length 352-472 mm in adults, tail length/snout-vent length 0.25-0.29, preoculars 1-2, subocular single, postocular single, one row of vertebral scales enlarged, 1-7 rows of dorsal scales keeled at mid-body, ventral scales 172-176, subcaudals 68-77, maxillary teeth 4-5, dorsal head solid black, 62-69 black bars on trunk, 27-33 black bars on tail, iris solid black.

KEYWORDS:
Molecular; morphology; slug-eating snake; taxonomy.

Species	Voucher	Locality	Accession	Sources
Pareas melanops sp. nov.	KIZ 2024092	Gengma, Yunnan, China	PQ699882	This study
Pareas melanops sp. nov.	KIZ 2024093	Gengma, Yunnan, China	PQ699883	This study
Pareas melanops sp. nov.	KIZ 2024094	Gengma, Yunnan, China	PQ699884	This study
Pareas melanops sp. nov.	KIZ 2024095	Gengma, Yunnan, China	PQ699885	This study
Pareas melanops sp. nov.	KIZ 2024096	Gengma, Yunnan, China	PQ699886	This study
Pareas abros	ZMMU R-16393	Song Thanh, Quang Nam, Vietnam	MZ712235	Poyarkov et al. (2022)
Pareas andersonii	CAS 235359	Natmataung, Chin, Myanmar	MT968772	Vogel et al. (2020)
Pareas atayal	NMNS 05594	Beiheng, Taoyuan, Taiwan	KJ642124	You et al. (2015)
Pareas baiseensis	ANU 000220008	Baise, Guangxi, China	OQ054328	Gong et al. (2023)
Pareas berdmorei	AUP 01573	Chiang Mai, Thailand	MZ712218	Poyarkov et al. (2022)
Pareas boulengeri	GP2923	Jiangkou, Guizhou, China	MK135090	Wang et al. (2020)
Pareas carinatus	KIZ 011972	Malaysia	MK135111	Wang et al. (2020)
Pareas chinensis	CIB 010140	Tianquan, Sichuan, China	JF827691	Guo et al. (2011)
Pareas dulongjiangensis	KIZ R201607	Gongshan, Yunnan, China	OQ718498	Liu et al. (2023a)
Pareas formosensis	NMNS 05637	Nantou, Taiwan	MW287060	Ding et al. (2020)
Pareas geminatus	DL2019072910	Jiangcheng, Yunnan, China	MW287067	Ding et al. (2020)
Pareas guanyinshanensis	KIZ 2023038	Yuanyang, Yunnan, China	PP215390	Liu et al. (2024)
Pareas hamptoni	YPX 18604	Kachin, Myanmar	MK135078	Wang et al. (2020)
Pareas iwasakii	NMNS 05655	Ishigaki, Okinawa, Japan	KJ642160	You et al. (2015)
Pareas kaduri	BNHS 3574	Lohit, Arunachal Pradesh, India	MW026190	Bhosale et al. (2020)
Pareas komaii	NMNS 05618	Lijia, Taitung, Taiwan	KJ642185	You et al. (2015)
Pareas kuznetsovorum	ZMMU R-16802	Song Hinh, Phu Yen, Vietnam	MZ712232	Poyarkov et al. (2022)
Pareas macularius	ZMMU R-16629	Ban Mauk, Sagaing, Myanmar	MT968771	Vogel et al. (2020)
Pareas margaritophorus	ZMMU NAP-09759	Suan Phueng, Ratchaburi, Thailand	MZ712217	Poyarkov et al. (2022)
Pareas modestus	MZMU 1293	Aizawl, Mizoram, India	MT968773	Vogel et al. (2020)
Pareas monticola	ZMMU R-16631	Ban Mauk, Sagaing, Myanmar	MW438296	Vogel et al. (2021)
Pareas niger	KIZ 059339	Kunming, Yunnan, China	MW436706	Liu and Rao (2021)
Pareas nigriceps	CHS656	Tengchong, Yunnan, China	MK201455	Li et al. (2020)
Pareas nuchalis	FK 2626	Belait, Brunei Darussalam, Brunei	MZ603794	Le et al. (2021)
Pareas stanleyi	HM 2007-S001	Guilin, Guangxi, China	JN230704	Guo et al. (2011)
Pareas temporalis	ZMMU R-13656	Cat Loc, Lam Dong, Vietnam	MZ712238	Le et al. (2021)
Pareas tigerinus	KIZ 20210703	Menghai, Yunnan, China	OP752143	Liu et al. (2023b)
Pareas tigerinus	KIZ 20210704	Menghai, Yunnan, China	OP752144	Liu et al. (2023b)
Pareas tigerinus	KIZ 20210705	Menghai, Yunnan, China	OP752145	Liu et al. (2023b)
Pareas victorianus	CAS 235254	Natmataung, Chin, Myanmar	MW438300	Vogel et al. (2021)
Pareas vindumi	CAS 248147	Lukpwi, Kachin, Myanmar	MW287080	Ding et al. (2020)
Pareas xuelinensis	KIZ XL1	Lancang, Yunnan, China	MW436709	Liu and Rao (2021)
Pareas yunnanensis	KIZ 2022033	Dali, Yunnan, China	OP752146	Liu et al. (2023b)
Aplopeltura boa	LSUHC 7248	Sepilok, Sabah, Malaysia	KC916746	Loredo et al. (2013)

	KIZ2024092	KIZ2024093	KIZ2024094	KIZ2024095	KIZ2024096
	Holotype	Paratype	Paratype	Paratype	Paratype
	Male	Female	Male	Female	Juvenile
SVL	472	411	404	352	249
TL	135	107	119	92	62
PrFBO	Yes	Yes	Yes	Yes	Yes
PreO	1/1	2/2	1/1	2/2	1/2
PosO	1/1	1/1	1/1	1/1	1/1
SubO	1/1	1/1	1/1	1/1	1/1
SPOF	No	No	No	No	No
LoBO	No	Yes	Yes	No	Yes
ATem	1/1	1/1	3/2	1/1	1/1
PTem	2/2	2/2	3/3	2/2	2/2
SupL	7/7	7/7	7/7	7/7	7/8
InfL	7/7	7/7	7/7	7/7	7/7
Vs	172	175	174	175	176
Prec	Undivided	Undivided	Undivided	Undivided	Undivided
Sc	71	69	77	75	68
Ds	15-15-15	15-15-15	15-15-15	15-15-15	15-15-15
NED	1	1	1	1	1
NKD	7	1	1	5	5
Max	4/4	4/4	4/4	5/4	4/4
VBTr	64	63	69	62	68
VBTa	33	28	30	31	27

	Pareas melanops sp. nov. (n=5)	Pareas tigerinus (n=3)	Pareas nigriceps (n=3)
SVL (in adults)	352-472	392-434	396-525.9
TL/SVL	0.25-0.29	0.25-0.26	0.25-0.32
PrFBO	Yes	Yes	Yes or No
PreO	1-2	1	1
PosO	1	Fused	Fused
SubO	1	Fused	Fused
SPOF	No	Yes	Yes
LoBO	Yes or No	No	No
ATem	1-3	1	1
PTem	2-3	1-2	2-3
SupL	7-8	7	7
InfL	7	8	7
Vs	172-176	160-171	175-184
Sc	68-77	62-64	73-76
Ds	15-15-15	15-15-15	15-15-15
NED	1	1	1
NKD	1-7	3-5	5-9
Max	4-5	4-5	6-7
VBTr	63-69	53-61	60-66
VBTa	27-33	22-24	18

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