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A New Species of Trachylepis Fitzinger, 1843 (Squamata: Scincidae) from Central African Forests

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A New Species of Trachylepis Fitzinger, 1843 (Squamata: Scincidae) from Central African Forests African Journal of Herpetology, 2008 57(1): 13-28. ©Herpetological Association of Africa Original article A new species of Trachylepis Fitzinger, 1843 (Squamata: Scincidae) from Central African forests LAURENT CHIRIO1, IVAN INEICH1, ANDREAS SCHMITZ2 AND MATTHEW LEBRETON3 1Muséum national d’Histoire naturelle, Département Systématique et Evolution USM 602 (Reptiles), case courrier no 30, 25 rue Cuvier, F-75005 Paris, France e-mail: [email protected] 2Muséum d’Histoire naturelle de la Ville de Genève (MHNG), Department of Herpetology and Ichthyology, C.P. 6434 CH – 1211 Geneva 6, Switzerland 3 Walter Reed Johns Hopkins Cameroon Program, CRESAR, PB 7039, Yaoundé, Cameroon Abstract.—Intensive collection and field observations in the Central African Republic revealed a previ- ously undescribed skink species of the genus Trachylepis. Morphologically this species seems to be related to Trachylepis boulengeri and/or T. polytropis, but genetic analysis showed that this is not the case. This species is unusual due to its large size (SVL up to 121 mm) and its rupicolous lifestyle. This species lives in habitats that are difficult to reach, which could explain why it remained undiscovered for such a long time. This species is not endemic to the Central African Republic, as individuals were recent- ly also collected in southern Cameroon. Résumé.—Des collectes intensives et des prospections récentes réalisées en République de Centrafrique ont permis la collecte d’une espèce de scinque non décrite du genre Trachylepis. Morphologiquement, cette espèce semble proche de Trachylepis boulengeri et/ou de T. polytropis mais l’analyse génétique réalisée a montré que ce n’était pas le cas. Cette espèce est originale par sa taille (longueur museau- cloaque jusqu’à 121 mm) et son mode de vie rupicole. Elle occupe des habitats difficiles d’accès, ce qui pourrait expliquer qu’elle soit passée inaperçue dans toutes les études antérieures. L’espèce n’est pas endémique de Centrafrique, car des collectes plus récentes ont permis de constater sa présence au sud du Cameroun. Key words.—Trachylepis, Scincidae, Central African Republic, Cameroon, rupicolous species, descrip- tion erpetological surveys undertaken by the Trachylepis Fitzinger, 1843; note that the genus Hprimary author in the Central African Mabuya Fitzinger, 1826 was recently split into Republic (CAR) from 1990 to 1996, yielded four generic taxa: Euprepis Wagler, 1830 for more than 4800 reptiles. These have been the afro-malagasy forms, Eutropis Fitzinger, deposited into the Paris Natural History 1843 for Asiatic forms, Mabuya sensu stricto Museum collections (MNHN). Among the for neotropical forms and Chioninia Gray, identified taxa from the collection, 62 were 1845 for the forms from Cape Verde Islands never reported from the CAR. This allowed for (Mausfeld et al. 2002). Bauer (2003), however, a more complete synthesis for the CAR (Chirio has since reported that the generic name & Ineich 2005) than the species account by Euprepis Wagler, 1830 can not be retained for Joger (1990). In the MNHN collection, 676 afro-malagasy forms of the former Mabuya skinks can be attributed to the genus genus and that the oldest available generic 13 AFRICAN JOURNAL OF HERPETOLOGY 57(1) 2008 name for them is Trachylepis Fitzinger, 1843 - pling sites within the CAR can be found in we follow this modification. Chirio & Ineich (2005). Tissue samples were taken from specimen MNHN 2005.2504 col- Of the Trachylepis specimens in the MNHN, 11 lected in Cameroon and included in a molecu- collected in the CAR was recently assigned to lar DNA analysis. We collected our specimens a new species, T. pendeana (Ineich & Chirio in sympatry with Trachylepis polytropis 2000). Twenty more specimens, collected from (Boulenger, 1903) and Trachylepis mac- nine different localities, cannot be assigned to ulilabris (Gray, 1845), two central African any known species in the genus. Four speci- forms which appeared the closest relatives mens collected between 1996 and 2001 in according to scalation characters. We also com- southern Cameroon during the CAMHERP pared our specimens with data on Trachylepis Project (8000 reptiles had been collected and boulengeri published in Broadley’s (1974, deposited at MNHN), appear to belong to the 2000) revisions and with the type specimen of same undescribed species. Coloration and sizes T. boulengeri (Berlin Museum, ZMB 22486; of these 24 specimens suggest close affinities type locality: Makonde Highland [“Makonde- with Trachylepis boulengeri (Sternfeld, 1911), Hochland”], Lindi Province, Tanzania; collect- an eastern and southern African species ed by Grote). (Tanzania, Mozambique, Malawi and Zimbabwe), but more strikingly to Trachylepis For each examined specimen we determined polytropis (Boulenger, 1903) which is found in sex and reported the following 13 morphomet- Western Africa (Ghana and Liberia) and ric and scalation characters (on both sides for Central Africa (Cameroon, CAR, Gabon, symmetrical characters): snout-vent-length Democratic Republic of Congo, Popular (SVL), ratio of tail length to body length Republic of Congo and Bioko). Our 24 speci- [LQU(%)], ratio of head length (snout end to mens from the central African forests, however, anterior tympanum border) to body length appear to differ from these species and all other [RTC(%)], number of scale rows at midbody members of Trachylepis in several external (EMC), number of scales dorsally from the characters. In this paper we also investigate nuchal (excluded from count) to tail base genetic differences. (EPQ), number of scales ventrally from the first post-mental pair (excluded from count) to the anal plates (also excluded) (RMA), number MATERIALS AND METHODS of subdigital lamellae under finger IV (LD4), number of subdigital lamellae under toe IV CAR specimens examined have being fully (LO4), number of supralabials with those accessioned into the MNHN collections (see widened in subocular position indicated Appendix). Cameroon specimens collected as a between brackets (SLA), number of supracil- result of CAMHERP Project will eventually all iaries (SCL), number of keels on dorsal scales be deposited into MNHN collections. Field tag (CAR), kind of contact between supranasals numbers are reported for those specimens not (CSN), kind of contact between prefrontals yet deposited. Our 24 specimens were captured (CPF). Finally, coloration patterns of all these by hand, with rubber bands or glue traps, specimens were carefully reported. before being fixed in formalin (10% solution) and later stored in 70 % ethanol; the specimens Molecular data were collected to examine the from Ndakane in CAR (MNHN 1997.3078) sequence variation between the new and from Kika in Cameroon (MNHN Trachylepis species and their morphologically 2005.2504, formerly CAMHERP 3433I) were closest relatives. We used a portion of the mito- photographed in vivo. Precise locations of sam- 14 CHIRIO ET AL. — New Trachylepis from Central African forests chondrial 16S rRNA gene and compared it with Holotype.—Muséum national d’Histoire the molecular data obtained in several previous naturelle, Paris: MNHN 1995.5612, adult male studies on the genus Trachylepis (e.g. Mausfeld collected on the border of a forest river, near et al. 2000, 2002; Mausfeld & Schmitz 2003; the village of Bélemboké, 45 km south of Nola Mausfeld et al. 2004) as well as several newly in Central African Republic [about 3°17’ N, sequenced specimens of the concerned species. 16°15’ E] (Fig. 2; see also Chirio & Ineich DNA was extracted from the tissue samples 2005), 31 May 1994, by Laurent Chirio. using QuiAmp tissue extraction kits (Qiagen) or a modified Chelex-Protocol (Walsh et al. Paratypes.—19 specimens collected by Laurent 1991; Schmitz 2003). The primers 16sar-L Chirio and Paul Makolowodé in CAR: Bambio, (light chain; 5’ - CGC CTG TTT ATC AAA MNHN 1997.3072-3073 - Bélemboké, MNHN AAC AT - 3’) and 16sbr-H (heavy chain; 5’ - 1995.5610-5611, 1995.5613-5614, 1997.3464- CCG GTC TGA ACT CAG ATC ACG T - 3’) 3467 - Kpoka, MNHN 1997.3075 - Mondika, of Palumbi et al. (1991) were used to amplify a MNHN 1997.3076-3077 - Ndakane, MNHN section of the mitochondrial 16S ribosomal 1997.3078 - Ouazoua, MNHN 1997.3079-3080 RNA gene. PCR products were purified using - Salkapa, MNHN 1997.3081 - S.C.A.D., QIAquick purification kits (Qiagen). MNHN 1997.3082 - Zimba, MNHN 1997.3083 Sequences (including complimentary strands (see Chirio & Ineich 2005 for collection loca- for assuring the accuracy of the sequences) tions on map). were obtained using an automatic sequencer (ABI 377). The obtained sequences (lengths Diagnosis.—Moveable eyelids with a white referring to the aligned sequences including border, the lower with a translucent palpebral gaps) comprised 544 bp. Sequences were disk; rectangular enlarged subocular, in direct aligned using ClustalX (Thompson et al. 1997; contact with the lip and not reduced basally by default parameters) and manually checked the intrusion of adjacent supralabials; snout using the original chromatograph data in the wide and massive; supra- and infralabials dark program BioEdit (Hall 1999). We used PAUP* in formalin fixed specimens and mental plate 4.0b10 (Swofford 2002) to compute the uncor- often lighter; finger and toe lamellae not keeled rected pairwise distances for all sequences. and not spinose; absence of distinct longitudi- nal or transversal dorsal bands; back uniformly The 24 specimens from CAR and Cameroon blackish and belly grey blue on formalin pre- differed from individuals of all
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