Xenochrophis trianguligerus (Boie, 1827)

Figueroa, Alex, Low, Martyn E. Y. & Lim, Kelvin K. P., 2023, Singapore’s herpetofauna: updated and annotated checklist, history, conservation, and distribution, Zootaxa 5287 (1), pp. 1-378 : 181-182

publication ID

https://doi.org/ 10.11646/zootaxa.5287.1.1

publication LSID

lsid:zoobank.org:pub:78E23714-8973-4755-BC94-0A751D7D2B37

DOI

https://doi.org/10.5281/zenodo.7967964

persistent identifier

https://treatment.plazi.org/id/88502B73-FF2E-B8C3-FF6B-436C78340DD6

treatment provided by

Plazi

scientific name

Xenochrophis trianguligerus
status

 

Xenochrophis trianguligerus View in CoL (H. Boie in F. Boie, 1827)— Native; Indeterminate.

Tropidonotus Trianguligerus H. Boie in F. Boie, 1827: 535. Lectotype: RMNH.RENA.1102, designated by R.F. Inger in 1959, according to R. de Ruiter pers. comm. in Koch (2012: 284). Type locality: “ Java ”, Indonesia.

Triangle Keelback

( Figures 20G & 20H View FIGURE 20 )

Singapore records.

Tropidonotus trianguligerus View in CoL — Ģnther, 1858b: 70.— Dennys, 1880a:3.— Blanford, 1881: 215.— Boulenger, 1893: 224.— Flower, 1896: 879.— Hanitsch, 1898: 19.— Flower, 1899: 659.—Ridley, 1899: 207.— Hanitsch, 1912b: 16.— de Rooij, 1917: 84.

Natrix trianguligera —Sworder, 1923: 61.— de Haas, 1949: 84 (Bukit Timah [BTNR]; Holland Road).— de Haas, 1950: 544.— Grandison, 1972: 84.—K.P. Lim & F.L.K. Lim, 1988d: 87.—K.K.P. Lim & L.M. Chou, 1990: 54.—L.M. Chou et al., 1994: 105.

Xenochrophis trianguligerus View in CoL —K.K.P. Lim & F.L.K. Lim, 1992: 80, 147.—R. Subaraj et al., 1995: 16 (Upper Peirce Service Road).— David & Vogel, 1996: 134.—R.C.H. Teo & Rajathurai, 1997: 384 (Lower Peirce West Forest [LPF]).—Chan-ard et al., 1999: 36.— Iskandar & Colijn, 2001: 110.—K.P. Lim & F.L.K. Lim, 2002: 147.— de Lang & Vogel, 2005: 178.—N. Baker & K.P. Lim, 2008: 161.—K.K.P. Lim et al., 2008: 166, 265.— Das, 2010: 343.—N. Baker & K.P. Lim, 2012: 161.— Das, 2012a: 129.—Wallach et al., 2014: 799.—Chan-ard et al., 2015: 223.— de Lang, 2017: 216.— Das, 2018: 100.— Charlton, 2020: 218.

Remarks. A common snake elsewhere throughout its range (Tweedie 1983; Stuebing et al. 2014; de Lang 2017), X. trianguligerus is exceedingly rare in Singapore ( Baker & Lim 2012). Xenochrophis trianguligerus was first reported in Singapore by Ģnther (1858b) who examined a specimen from Hardwicke’s collection. Blanford (1881) included X. trianguligerus in his list from Dennys ( Dennys 1880a), and Boulenger (1893) reported three specimens from Hardwicke and one by Dennys deposited at NHMUK. Subsequent to de Haas (1949) report of two specimens stored at the Raffles Museum that were collected in 1894 at BTNR and 1909 at Holland Road, X. trianguligerus was not recorded again until 86 years later ( Table 2 View TABLE 2 ) on 20 May 1995 when a roadkill was found along UPRR (Lim et al. 1995) that Teo & Rajathurai (1997) reported as a moult of X. trianguligerus . Three specimens of H. petersii were misidentified as X. trianguligerus (see account of H. petersii above).

Occurrence. Known only from a few specimens predating 1909 and one from 1995. Rare.

Singapore conservation status. Critically Endangered.

Conservation priority. Highest.

IUCN conservation status. Least Concern [2021].

LKCNHM & NHMUK Museum specimens. Singapore (no locality) : BMNH 1880.9 .10.38 (no date) , BMNH 1963.962 963 (no date); Bukit Timah Nature Reserve : ZRC.2.2493 (26-May-1894); Holland Road : ZRC.2.2494 (31-May-1909) .

Additional Singapore museum specimens. Singapore (no locality): BPBM; Bukit Timah Nature Reserve: BPBM.

Singapore localities. Bukit Timah Nature Reserve—Holland Road*—Lower Peirce Forest—Upper Peirce Reservoir Road.

NHMUK

Natural History Museum, London

ZRC

Zoological Reference Collection, National University of Singapore

BPBM

Bishop Museum

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Squamata

Family

Colubridae

Genus

Xenochrophis

Loc

Xenochrophis trianguligerus

Figueroa, Alex, Low, Martyn E. Y. & Lim, Kelvin K. P. 2023
2023
Loc

Xenochrophis trianguligerus

Charlton, T. 2020: 218
Das, I. 2018: 100
de Lang, R. 2017: 216
Das, I. 2012: 129
Das, I. 2010: 343
de Lang, R. & Vogel, G. 2005: 178
Lim, K. P. & Lim, F. L. K. 2002: 147
Iskandar, D. T. & Colijn, E. 2001: 110
David, P. & Vogel, G. 1996: 134
Lim, K. K. P. & Lim, F. L. K. 1992: 80
1992
Loc

Natrix trianguligera

Chou L. M. & Ng, P. K. L. & Lim, K. K. P. 1994: 105
Lim, K. 1988: 87
Grandison, A. G. C. 1972: 84
de Haas, C. P. J. 1950: 544
de Haas, C. P. J. 1949: 84
1949
Loc

Tropidonotus trianguligerus

de Rooij, N. 1917: 84
Hanitsch, R. 1912: 16
Flower, S. S. 1899: 659
Hanitsch, R. 1898: 19
Flower, S. S. 1896: 879
Boulenger, G. A. 1893: 224
Blanford, W. T. 1881: 215
Dennys, N. B. 1880: 3
Gnther, A. 1858: 70
1858
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