Thrasops occidentalis Parker 1940

Continent: Africa
Distribution: Guinea, Ivory Coast, Ghana, Togo, Senegal
Type locality: Axim, Gold Coast [= Ghana]

Original Description: H. W. Parker in 'Annals and Magazine of Natural History' Vol. 11, 1940; "Undescribed anatomical structures and new species of reptiles and amphibians" (257-274).

Key to Central and West African species of the genus Thrasops:

1. More than 188 ventrals –> 2

Fewer than 188 ventrals –> 3

2. 13 or 15 dorsal scale rows –>T. flavigularis

17 to 21 dorsal scale rows –>T. jacksonii

3. Dorsal scales keeled –>T. occidentalis

Dorsal scales smooth –> 4

4. 13 dorsal scale rows; cloacal scale single –>T. batesii

15 to 19 dorsal scale rows; cloacal scale divided –>T. aethiopissa (Chippaux, 2012)

Thrasops occidentalis Species Characteristics:

"Ventrals: 175-187

Dorsal Scale Rows: 15-21 rows at midbody, the vertebral row widened

Sub-Caudal: 119-140

*3 labials in contact with lowest postocular." (Parker, 1940)

Appearance: "Rostral subquadrangular, a little broader than deep, visible from above; nasal divided; internasals as long as the prefrontals ; frontal slightly longer than broad, longer than its distance from the rostral (in adult), longer than its distance from the end of snout (in young), slightly shorter than the parietals; no enlarged occipitals; loreal present; preocular 1, separated from the frontal; eye large, its diameter much greater than its distance from the mouth; postoculars 3, lowest in contact with 3 upper labials; temporals 1 + 1; upper labials 8, rarely 7, the fourth and fifth entering the orbit; 4 lower labials in contact with the anterior sublinguals, which are shorter than the posterior. Midbody scales in 15-19 rows, not longer than the ventrals, at least the median rows keeled in adults though all may be smooth in young; ventrals 175-187; anal divided; subcaudals 120-140 pairs." (H.U.M.C., 1863)

Color: "Above, in adults, black; in young, head and neck olive, sides of head whitish, the sutures between the scales picked out in black, dorsum chequered with subrectangular black and yellow spots arranged in 6 to 8 longitudinal rows. Below, in adults, chin and throat straw colored, otherwise dark olive; in young, chin and throat whitish, belly black, the ventrals with alternately two or three transversely oval yellow spots ; subcaudals yellow margined with black." (H.U.M.C., 1863)

Size: "Total length of paratype d 71 (B.M. 66.1.28.6), 1165 (670 + 495) mm. from Sierra Leone; of 9 holotype (B.M. 1911.6.30.2), 1085 (682 + 403) mm. from Axim, Gold Coast." (H.U.M.C., 1863)

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Thrasops occidentalis Thrasops generoko animalia da. Narrastien barruko Colubridae familian sailkatuta dago.

Thrasops occidentalis est une espèce africaine de serpents de la famille des Colubridae.

Thrasops occidentalis là một loài rắn trong họ Rắn nước. Loài này được Parker mô tả khoa học đầu tiên năm 1940.