Naja ashei WÜSTER & BROADLEY, 2007
|Higher Taxa||Elapidae, Serpentes (snakes)|
|Common Names||Ashe’s spitting cobra|
|Synonym||Naja ashei WÜSTER & BROADLEY 2007|
Naja (Afronaja) ashei — WALLACH et al. 2009
Naja ashei — LARGEN & SPAWLS 2010: 599
Naja ashei — LIVIGNI 2013: 405
Afronaja ashei — WALLACH et al. 2014: 9
|Distribution||Kenya, S Somalia, SE Ethiopia, NE Uganda, NE Tanzania ?|
Type locality: Watamu, Kenya (3° 21’S: 40° 01’E). Map legend:
- Type locality.
- Region according to the TDWG standard, not a precise distribution map.
NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
|Types||Holotype: NMK S/3993, female, National Museums of Kenya, coll. Royjan Taylor, maintained in captivity at Bio-Ken Snake farm until 29/09/2004. Paratypes: BMNH.|
Diagnosis. Naja ashei differs from all other African spitting cobras in possessing a unique clade of mtDNA haplotypes. From the data presented here, we identified 12 fixed nucleotide differences that differentiate N. ashei from the other eastern African spitting Naja. These correspond to positions 105, 169 and 315 of the ND4 sequence of the holotype (DQ897706), and to positions 60, 108, 153, 201, 348, 381, 507, 630 and 676 of the cytochrome b sequence of the same specimen (DQ897749), the diagnostic bases at these positions being C, T, G, C, G, T, T, T, A, C, T and A, respectively.
Morphologically, N. ashei differs from East African N. nigricollis in a number of characters relating to adult colour pattern and scalation. In particular, its midbody and posterior ventral colour is predominantly light, with dark pigment encroaching mostly from the sides of the body (venter normally largely or entirely dark in N. nigricollis), it lacks any red, orange or pink pigment under the throat (usually pronounced in N. nigricollis), and the head is the same olive-brown colour as the rest of the body (often black above and below in East African N. nigricollis). Scalation does not provide any absolutely diagnostic characters for N. ashei, but mean scale counts and the range differ clearly from those of East African N. nigricollis (Table 4). In particular, N. ashei can be distinguished from most eastern African N. nigricollis by the combination of high ventral scale and dorsal scale row counts. Most N. ashei have over 195 ventrals and at least 21 and typically more scale rows around the neck, whereas most N. nigricollis with 195 or more ventrals have at most 21, and usually 19 or fewer scale rows around the neck, whereas higher scale row counts around the neck tend to be found in specimens with fewer ventral scales.
Naja ashei differs from the more closely related N. mossambica in lacking any dark edges on the labial scales and ventral scales, in having a less complex ventral banding pattern, and in having higher average ventral scale counts, but lower dorsal scale row counts. Naja pallida and N. nubiae differ in having higher midbody dorsal scale row counts (usually 25, compared to 21–23 in N. ashei). In addition, N. pallida differs from N. ashei in having a single, very clearly defined and clean-edged throat band (which very obviously crosses the neck except in older, darker specimens), in usually having higher ventral scale counts, and in the frequent presence of a single preocular and seven supralabials. Naja nubiae also has a cleaner, neater throat pattern, and two dark bands across the neck and two or three across the throat; a characteristic black tear-drop marking (consisting of dark edges to the supralabial suture below the eye) is almost invariably present; moreover, N. nubiae has almost consistently higher ventral scale counts, and often has seven supralabials and/or a single preocular (see Wüster & Broadley, 2003). Naja katiensis has consistently lower ventral and subcaudal scale counts (Table 4), a much smaller adult size, and lacks cuneate scales. Among the non-spitting cobras, N. ashei is most likely to be confused with N. haje, on account of its drab brownish coloration and large size. However, N. haje differs in having a single preocular, a row of suboculars separating the eyes from the supralabials, a greatly enlarged sixth supralabial, a single anterior temporal, and in lacking spitting adaptations to the fangs (Bogert, 1943), and thus being incapable of spitting venom. Naja melanoleuca similarly differs from N. ashei in having a single preocular, no suboculars, an enlarged sixth supralabial and a single anterior temporal.
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