The first record of Delacour’s marmoset rat (Hapalomys delacouri) in Guangdong

doi:10.16829/j.slxb.150898

Abstract

Abstract:

On December 6, 2021 a Hapalomys specimen was collected at Mt. Nanling in Guangdong Province (113°00′11.87″ E, 24°56′17.57″ N, altitude 1 023 m). We conducted external and cranial measurements and compared them with those of congeneric species. We sequenced the full-length mitochondrial CYTB gene and constructed a phylogenetic tree using the maximum likelihood method. The specimen has nails on both the thumb and the hallux; the first upper molar has three columns of cusps, each column with three main cusps, which are characteristic of the genus Hapalomys. The absence of two small cusplets between the three main cusps on the anterior margin of the first upper molar, and a tail length nearly equal to the head and body length, are consistent with the features of Hapalomys delacouri. The mitochondrial CYTB phylogenetic tree also showed that this specimen clustered with the Hapalomys delacouri sequences obtained from GenBank, with a bootstrap support of 100%. Collectively, these findings confirm that the specimen belongs to Hapalomys delacouri, representing its first distribution record in Guangdong.

Key words: Hapalomys delacouri, Geographical distribution, Guangdong Province, First record

关键词: 小狨鼠, 地理分布, 广东省, 新纪录

CLC Number:

Q958.3

Qiuqin LU, Feiyu LEI, Xiaoyun ZHENG, Zeling ZENG, Haibin YU, Wenhua YU, Yi WU, Kai HE. The first record of Delacour’s marmoset rat (Hapalomys delacouri) in Guangdong[J]. ACTA THERIOLOGICA SINICA, 2025, 45(3): 409-414.

卢秋芹, 雷飞宇, 郑晓云, 曾泽玲, 于海彬, 余文华, 吴毅, 何锴. 广东兽类新纪录——小狨鼠[J]. 兽类学报, 2025, 45(3): 409-414.

Figures/Tables 5

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测量指标 Measurements	小狨鼠 H. delacouri 中国广东 Guangdong，China （n = 1）（本研究 This study）	小狨鼠老挝亚种 H. d. pasquieri 老挝 Laos （n = 1）（Musser， 1972）	小狨鼠海南亚种 H. d. marmosa 中国海南 Hainan，China （n = 1）（Musser， 1972）	小狨鼠 H. delacouri 泰国，老挝，越南 Thailand， Laos， Vietnam（n = 4 ~ 5）（Abramov et al.， 2017）
体质量 W	31.3	—	—	—
头体长 HB	108	121	130	129.3 （5） 115.0 ~ 136.0
尾长 TL	102	171	138	148.6 （5） 140.0 ~ 160.0
后足长 HF	21	22	22	—
耳长 EL	12	15	12	—
颅全长 ONL	29.53	32.0	—	33.11 （5） 31.81 ~ 34.15
颧宽 ZB	15.83	17.5	—	17.45 （5） 16.75 ~ 17.90
眶间距 IB	4.52	4.7	—	5.07 （5） 4.62 ~ 5.44
吻长 LR	7.70	8.3	—	9.63 （4） 9.25 ~ 10.32
吻宽 BR	3.94	6.1	—	5.95 （5） 5.08 ~ 6.70
脑颅宽 BBC	14.93	15.3	—	15.33 （5） 14.72 ~ 16.70
脑颅高 HBC	9.68	9.0	—	9.14 （4） 9.05 ~ 9.26
颧骨板宽 BZP	5.27	3.6	—	3.56 （4） 3.31 ~ 3.75
齿隙长 LD	7.08	8.1	—	8.57 （5） 7.91 ~ 8.90
门齿孔长 LIF	4.32	5.6	—	5.95 （5） 5.70 ~ 6.24
门齿孔宽 BIF	1.86	2.0	—	1.95 （5） 1.80 ~ 2.10
腭桥长 LBP	6.21	6.0	—	6.77 （5） 6.40 ~ 7.04
腭桥宽 BBP	2.52	2.6	—	2.51 （5） 2.39 ~ 2.67
腭后长 PPL	10.26	—	—	11.86 （5） 10.91 ~ 13.00
中翼骨窝宽 BMF	1.96	1.9	—	1.91 （5） 1.76 ~ 2.00
听泡长 LB	6.09	6.0	—	6.59 （5） 6.40 ~ 6.86
上臼齿列长 CLM1-3	5.70	5.9	—	6.06 （5） 5.50 ~ 6.42
上颌第一臼齿外宽BM1	1.63	—	—	1.76 （5） 1.66 ~ 1.82

测量指标 Measurements	小狨鼠 H. delacouri 中国广东 Guangdong，China （n = 1）（本研究 This study）	小狨鼠老挝亚种 H. d. pasquieri 老挝 Laos （n = 1）（Musser， 1972）	小狨鼠海南亚种 H. d. marmosa 中国海南 Hainan，China （n = 1）（Musser， 1972）	小狨鼠 H. delacouri 泰国，老挝，越南 Thailand， Laos， Vietnam（n = 4 ~ 5）（Abramov et al.， 2017）
体质量 W	31.3	—	—	—
头体长 HB	108	121	130	129.3 （5） 115.0 ~ 136.0
尾长 TL	102	171	138	148.6 （5） 140.0 ~ 160.0
后足长 HF	21	22	22	—
耳长 EL	12	15	12	—
颅全长 ONL	29.53	32.0	—	33.11 （5） 31.81 ~ 34.15
颧宽 ZB	15.83	17.5	—	17.45 （5） 16.75 ~ 17.90
眶间距 IB	4.52	4.7	—	5.07 （5） 4.62 ~ 5.44
吻长 LR	7.70	8.3	—	9.63 （4） 9.25 ~ 10.32
吻宽 BR	3.94	6.1	—	5.95 （5） 5.08 ~ 6.70
脑颅宽 BBC	14.93	15.3	—	15.33 （5） 14.72 ~ 16.70
脑颅高 HBC	9.68	9.0	—	9.14 （4） 9.05 ~ 9.26
颧骨板宽 BZP	5.27	3.6	—	3.56 （4） 3.31 ~ 3.75
齿隙长 LD	7.08	8.1	—	8.57 （5） 7.91 ~ 8.90
门齿孔长 LIF	4.32	5.6	—	5.95 （5） 5.70 ~ 6.24
门齿孔宽 BIF	1.86	2.0	—	1.95 （5） 1.80 ~ 2.10
腭桥长 LBP	6.21	6.0	—	6.77 （5） 6.40 ~ 7.04
腭桥宽 BBP	2.52	2.6	—	2.51 （5） 2.39 ~ 2.67
腭后长 PPL	10.26	—	—	11.86 （5） 10.91 ~ 13.00
中翼骨窝宽 BMF	1.96	1.9	—	1.91 （5） 1.76 ~ 2.00
听泡长 LB	6.09	6.0	—	6.59 （5） 6.40 ~ 6.86
上臼齿列长 CLM1-3	5.70	5.9	—	6.06 （5） 5.50 ~ 6.42
上颌第一臼齿外宽BM1	1.63	—	—	1.76 （5） 1.66 ~ 1.82

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