by Octavio Jiménez Robles & Gabriel Martínez del Marmol Marín.
In North Africa, three species of large paleartic vipers have been recorded inside the genus Macrovipera sensu Herrmann et al., 1992 (Schleich et al., 2006). Several phylogenetic studies suggest the allocation of two of these species inside the genus Daboia (Lenk et al., 2001; Garrigues et al., 2005; Wüster et al., 2008; Pyron et al., 2011): D. mauritanica (Duméril & Bibron, 1848), and D. deserti (Anderson, 1892). The third described clade in North Africa is Macrovipera lebetina transmediterranea Nilson & Andrén 1988, not included in any recent phylogenetic analysis. The validity of the taxa transmediterranea and deserti as full species is currently uncertain due to the scarcity of records along all their supposed distribution.
After its description in 1988, the existence of M. l. transmediterranea has never been accurately confirmed. It was described from five specimens tagged from Algiers and Tunis (the capitals of Algeria and Tunisia) as a sympatric species with D. mauritanica with shorter body length, reduced number of dorsal scale rows and different colour pattern (Nilson & Andrén, 1988). Another transmediterranea specimen not collected was mentioned to be observed in Djebel Murdjadjo, near Oran, Algeria (Nilson & Andrén, 1988). Bons & Geniez (1996) suggested the possibility that this viper occurs in northeast Morocco, although for the moment there is no information about it. Recently one (or several) snake(s) was(were) identified as M. l. transmediterranea after being captured in rocky areas of north Tunisia, without exact locality (Bazaa et al., 2005; 2006; 2009; Sanz et al., 2006; Liman et al. 2010). In those venom proteomic publications it is not specified whether this specimen was deposited in a scientific collection, so for the moment its identity as the taxon transmediterranea remains unverifiable. In Dobiey & Vogel’s book (page 143, 2007) there is a picture of a viper named as this species, but the specimen has an unknown origin (J.J. Calvete & A. Bazaa, pers. comm.), so it cannot be assigned neither to transmediterranea nor to Tunisia.
|colour pattern||wavy undulating zig-zag band along the back which constitutes 23 to 33 blotches or windings (sometimes reddish or brownish with weakly developped pattern)||rather pale with wavy undulating band weakly developed or absent (it fades with age)||34 to 41 transverse bands (31-46; Herrmann et al., 1992)|
|number of scale rows between the dark blotches and the ventrals (Kramer & Schnurrenberger, 1963)||5||3-4||?|
|midbody dorsal scale rows||27||27||25|
|neck scale rows||26-27||26-27||~24|
|scales on upper surface of head||keeled||smooth||keeled|
|rostral shield||broader than high||higher than broad||broader than high|
|ventrals||157-174 ♀♀; 163-170 ♂♂||164-170 ♀♀; 166-169 ♂♂||150-164 ♀♀; 154-163 ♂♂|
|subcaudals||45-48 ♀♀; 45-50 ♂♂||44-51 ♀♀; 46-51 ♂♂||37-43 ♀♀; 42-51 ♂♂|
Appart from its scarcity of records, the morphological diagnostic traits of transmediterranea are doubtful. Besides transmediterreanea dorsal colour pattern was described as transversal bars (see Table 1; Nilson & Andrén, 1988), several authors consider it similar to the wavy undulating pattern of mauritanica (Herrmann et al., 1992; Venchi & Sindaco, 2006). Other differences such as the reduced dorsal scales might be inside the variation of juveniles of mauritanica as well (Venchi & Sindaco). Hence, the validity of transmediterranea is questionable (Venchi & Sindaco, 2006; Agasyan et al., 2009; R. Sindaco, pers. comm.). However a specimen of the Natural History Museum of London has recently been identified as M.l. transmediterranea (W. Wuster, pers. comm.).
The only concise way of solving this uncertainty on the phylogenetic allocation of the taxon transmediterranea, would be including genetic material of the syntypes in next molecular phylogenetic studies. We suspect the taxon transmediterranea will be probably allocated in the Daboia clade, as it is widely separated from other Macrovipera populations in the Eastern Mediterranean, and close to other Daboia. Evenmore, transmediterranea might be a synonymy of D. mauritanica.
Daboia deserti was described as a subspecies of M. lebetina differing from the type of D. mauritanica by the absence of canthus rostralis and interorbital scales not keeled (Anderson, 1892). As an anecdote, Anderson used for comparison some two of the specimens that later would become syntypes of transmediterranea (Nilson & Andrén, 1988). The colour pattern of deserti was described as “pale yellowish brown above with very faint indications of the dorsal and lateral dark spots distinctive of Algerian and Cyprian examples of the typical form” (Anderson, 1892).
Since the description of deserti its distribution and phylogenetic relations with mauritanica are not clear. Kramer & Schnurrenberger (1963) suggested that deserti should be regarded as a subspecies of D. mauritanica. They stated a disjunct distribution for both taxa: north of the High Atlas Range and coastal areas of Algeria for mauritanica, and from south of the Atlas Range to Libya for deserti. Another morphologic trait was pointed for the diagnosis: the number of scale rows between the dorsal dark blotches and the ventrals is normally more than 5 in mauritanica and 3-4 rows in deserti (Kramer & Schnurrenberger, 1963).
After considering deserti as a close taxon to mauritanica due to morphologic similarities (Kramer & Schnurrenberger, 1963), the work of Herrmann and collaborators (1987; 1992) with non-genetic molecular methods showed differences to separate them again as independent species. The immunological distance of mauritanica to the Cypriotic M. l. lebetina, was smaller than the distance with deserti (Herrmann et al., 1987).
In Morocco some specimens with a pale colour pattern have been found (Destre et al., 1989). They were attributed to a pale morph of D. mauritanica (Saint Girons, 1956; Nilson & Andren, 1988) distributed along the Antiatlas and the south of the High Atlas (Geniez et al., 1991; Bons & Geniez, 1996). However, other authors identified them as D. deserti (Destre et al., 1989; Schleich et al., 1996).
In more recent phylogenetic research with mitochondrial DNA fragments both mauritanica and deserti were grouped together with very short branches (Lenk et al., 2001; Pyron et al., 2011), suggesting a very low genetic differentiation, even below the species level (Miras et al., 2006; Stümpel & Jöger, 2011; U. Jöger, pers. comm.).
The separation of deserti and mauritanica as different species (Herrmann et al., 1987; 1992) has been criticized from the morphological point of view (Wade, 2008), because specimens of the most separated limits of the distribution of both species were used: D. mauritanica of Aouolouz, Morocco and D. deserti of Djebel Nefusa, Libya, without examining specimens of the middle of the distribution of both species (Algeria). The analysis of specimens of the “pale morph” of D. mauritanica in Algeria suggests the possibility of a clinal differentiation from northwest to southeast (Wade, 2008). In fact, apart from the colour pattern, some of the traits used in the description of deserti, such as the smooth upper head scales, are not consistent in all the currently known specimens (Schleich et al., 1996).
The distribution areas of both coloration patterns remain unclear. The contrasted morph of mauritanica is found in north Atlas and coastal areas of Algeria; while the pale morph of mauritanica/deserti has been observed from south of Atlas range to Lybia through the Saharan Atlas in Algeria and Tunisia. However exceptions to this range pattern have been found. The variability in the coloration of Daboia in the Maghreb is rather high.
The specimen from Djebel Murdadjo (Algeria; Nilson & Andrén, 1988) might belong to the pale morph of Daboia mauritanica/ Daboia deserti (P. Geniez, pers. comm.).
Mario Schweiger found two sympatric specimens with different colouration south of the Atlas: one contrasted (male) and one pale (female).
Whereas Tomas Mazuch and collaborators (pers. comm.) found two Daboia specimens with “deserti” pattern in Mediterranean habitat in northwest Tunisia, Karel Rozínek found a specimen with “mauritanica” pattern in Chambi National Park, Atlas range, where Daboia deserti should be the expected species (T. Mazuch, pers.comm.). A possibly similar pattern is found in the Chalcides ocellatus species complex, as specimens of a North Moroccoan-Algerian clade were found in Redeyef, aproximately 90 km south of Jebel Chambi (Kornilios et al., 2010).
In the areas between Agadir and Tan-tan (Morocco) it is even possible to find individuals of both morphs, intermediate individuals and sometimes specimens of both “morphs” with a reddish coloration. This pattern was described for D. mauritanica (Saint-Girons, 1956, Nilson & Andrén, 1988).
Further research with genetic phylogenies with a wide sampling all over northwest Africa, is necessary to clarify the identity of clades such us transmediterranea or deserti as full species (or subspecies). They might be simply morphological variations of D. mauritanica, or something else as a consequence of certain isolation. In a next future the population structure of this species complex will be better known.
We thank Roberto Sindaco, Ulrich Joger, Tomas Mazuch, Wolfgang Wuster, Mario Schweiger, Ed Wade, Philippe Geniez, Fernando Martínez Freiría, Juan Timms, Daniel Gómez, Hazel Skeet, Karel Rozínek, Juan Jose Calvete, Amine Bazaa, Alexander Westerström, Raúl León and Peter Stafford’s family for their pictures, articles or information.
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