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Notes on the Easternmost Population of Diploglossus Bilobatus (Squamata: Anguidae) in Veraguas, Panama

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Notes on the Easternmost Population of Diploglossus Bilobatus (Squamata: Anguidae) in Veraguas, Panama SALAMANDRA 46(1) 59–62 20 February 2010 CorrespondenceISSN 0036–3375 Correspondence Notes on the easternmost population of Diploglossus bilobatus (Squamata: Anguidae) in Veraguas, Panama Sebastian Lotzkat1+2, Leonhard Stadler1+3, Arcadio Carrizo4, Andreas Hertz1+2 & Gunther Köhler1 1) Senckenberg Forschungsinstitut und Naturmuseum Frankfurt, Senckenberganlage 25, 60325 Frankfurt am Main, Germany 2) Johann Wolfgang Goethe-University, Institute for Ecology, Evolution & Diversity, BioCampus – Westend, Siesmayerstraße 70, 60323 Frankfurt am Main, Germany 3) Justus-Liebig-University, Department of Animal Ecology, Heinrich-Buff-Ring 26–32 (IFZ), 35392 Giessen, Germany 4) Instituto de Ciencias Ambientales y Desarrollo Sostenible, Universidad Autónoma de Chiriquí, David, Panamá Corresponding author: Sebastian Lotzkat, e-mail: [email protected] Manuscript received: 13 January 2009 Diploglossus bilobatus was described as Celestus bilobatus DIVA–GIS and the NASA elevation datasets processed by by O’Shaughnessy (874) based on a single specimen from Jarvis et al. (2006). General climate data for the region ‘Costa Rica’. This moderate-sized anguid with sheathed were taken from the WorldClim database (Hijmans et al. claws is a terrestrial inhabitant of humid forests of low and 2005). premontane elevations (Savage 2002). Köhler (200) and Köhler et al. (2004) documented its presence in the Car- ibbean lowlands of Nicaragua. Myers (973) published the Distribution first record from Panama, referring to three specimens from the vicinity of Almirante in Bocas del Toro Province. We provide the following records for Diploglossus bilobatus Martínez & Rodriguez (992) and consequently Mar- from western Panama: tínez et al. (994) reported D. bilobatus from the vicinity Bocas del Toro Province: Isla Popa, 9°3.23’N, 82°8.47’W, of Santa Fé (Veraguas Province), extending its known dis- 0 m a.s.l.: one juvenile (SMF 85002, field number GK tribution by about 60 km to the southeast. However, their 559), collected by GK on 9 January 2006. Veraguas Prov- record was little noticed, as neither Young et al. (999) nor ince: Cerro Mariposa near Alto de Piedra, approx. 3.5 km Köhler (2008) included Veraguas in the distribution of D. W of Santa Fé, 8°30.96’N, 8°7.’W, 883 m a.s.l.: four adult bilobatus. Unfortunately, the specimens collected around females (SMF 89546–9; field numbers SL 24–7), collected Santa Fé have since been lost (V. Martínez pers. comm.). by AH and SL on 2 May 2008; Cerro Mariposa, approx. Fieldwork conducted in western Panama in January 4 km W of Santa Fé, 8°30.9’N, 8°7.2’W, 933 m a.s.l.: ju- 2006 as well as between May and August 2008 produced venile (field number LSt 89), collected by LS and NH on several specimens of Diploglossus bilobatus, both from Bo- 2 August 2008. Cerro Negro, approx. 6 km NNW of Santa cas del Toro and Veraguas provinces. It is the purpose of Fé, 8°34.53’N, 8°5.85’W, 063 m a.s.l.: one juvenile (SMF the present paper to report on the localities of, and the 8995), collected by AC on 29 July 2008. morphological variation among, these specimens. The juvenile specimen from Isla Popa documents the The specific identities of our specimens were deter- presence of D. bilobatus on an island of the Archipiela- mined using taxonomic keys and species descriptions pro- go Bocas del Toro for the first time. The specimens from vided by Taylor (956), Myers (973), Savage (2002), and Cerro Mariposa – which corresponds to the ‘Cerro Tute’ Köhler (2008). Scale nomenclature follows Myers (973). of Martínez & Rodriguez (992) and Martínez et al. Abbreviations for collectors are AC for Arcadio Carrizo, (994) – and Cerro Negro (see Fig. ) reconfirm the spe- AH for Andreas Hertz, GK for Gunther Köhler, NH for cies’ presence in the area of Santa Fé, Veraguas, about 60 Nadim Hamad, LS for Leonhard Stadler, and SL for Sebas- km SE from the records published by Myers (973). Since tian Lotzkat. Specimens labelled with LSt field numbers the Caribbean lowlands of western Panama form a contin- will be deposited in the collection of the Universidad Au- uous humid corridor, an uninterrupted occurrence of D. tónoma de Chiriquí, Davíd, Panama. The capitalized col- bilobatus along these lowlands and the adjacent northern ours and colour codes (the latter in parentheses) are those versants of the western Panamanian highlands (Serranías of Smithe (975–98). The map (Fig. ) was created using de Talamanca and Tabasará) is to be presumed. © 2010 Deutsche Gesellschaft für Herpetologie und Terrarienkunde e.V. (DGHT), Rheinbach, Germany All articles available online at http://www.salamandra-journal.com 59 Correspondence Figure 1. Map of western Panama indicating records of Diploglossus bilobatus (see text for details): (1) Almirante; (2) Isla Popa; (3) Cerro Negro; (4) Cerro Mariposa. Variation Color (54) dorsolateral stripe present, lateral surfaces of body Cinnamon-Drab (29C), grading ventrally into Light All seven specimens reported herein share the pholidotic Russet Vinaceous (22D); venter Light Russet Vinaceous characters mentioned by Myers (973) as diagnostic for (22D); dorsal surface of head Verona Brown (223B); lateral Diploglossus bilobatus: a single, large prefrontal; two su- surfaces of head and neck Light Drab (9C), with Chamois perposed postnasals; nasal in contact with rostral; nostril (23D) bars on lips and neck; upper surfaces of limbs Raw pierced in the posterior portion of the nasal; and striated Umber (223); dorsal surface of tail Sepia (9) with Light dorsal and lateral body scales (smooth in juveniles). How- Drab (9C) scale centres; ventral surfaces of head and ever, certain pholidotic characters vary among our Panama- neck Pale Neutral Gray (86) with Chamois (23D) flecks on nian sample: as in the material examined by Myers (973), chin; ventral surface of tail Light Neutral Gray (85); ventral several of our specimens exhibit, either on one (SMF 89549; surfaces of hands and feet Plumbeous (78). LSt 89) or both (SMF 89548) sides of the head, a single first The other three adult females from Cerro Mariposa ex- (anterior) loreal touching the posterior internasal rather hibited a different colouration. As a representative exam- than the two superposed first loreals (with the upper one ple, one of them (SMF 89547; Fig. 2a) was recorded as fol- touching the prefrontal) commonly found in this species. lows: Dorsal scales Verona Brown (223B), edged by Sepia One specimen (SMF 89547) shows five, another one (SMF (9); a Clay Color (23B) dorsolateral line present; lateral 8995) seven instead of the usual six supralabials to the lev- surfaces of body Mars Brown (223A), grading into King- el below the centre of eye on one side of the head. Three fisher Rufous (240) ventrally; venter Kingfisher Rufous specimens (SMF 85002, 89549; LSt 89) have five instead of (240); dorsal surface of head Raw Umber (23), lateral sur- the usual six infralabials to the level below the centre of eye faces of head and neck Olive-Green (Auxiliary) (48) with on one side of the head. The number of longitudinal scale Chamois (23D) bars on lips and Sulfur Yellow (57) flecks rows at midbody ranges from 36 (SMF 8995) to 42 (SMF on neck; upper surfaces of limbs Raw Umber (223); dorsal 89546). While dorsal and lateral trunk scales of the juve- surface of tail Sepia (9) with Dark Drab (9B) pigment in nile specimens are smooth, those of the adult specimens scale centres; ventral surfaces of head and neck Light Drab have 8–2 striae. In contrast to the specimens described by (9C) with Chamois (23D) flecks on chin; ventral surfaces Taylor (956) and Myers (973), none of our specimens of hands and feet Sepia (9). has any discernible median keels on these scales. Never- The juvenile collected on Cerro Mariposa was record- theless, the pholidotic variation within our sample concurs ed as follows: Dorsal ground colour Jet Black (89), grad- well with the observations of these authors. ing into Spectrum Yellow (55) towards tip of snout; venter mainly transparent, with a suggestion of Dark Neutral Gray (83); ventral surface of tail uniform Dark Neutral Gray (83); Colouration in life lateral surfaces speckled with Apple Green (6). The juvenile from nearby Cerro Negro (Fig. 2c) has a We found colouration to be quite variable among our sam- lower number of rather bluish-white speckles on the flanks ple. One of the adult females (SMF 89548; Fig. 2b) from and shows suggestions of the dorsal reticulum present in Cerro Mariposa, Veraguas, was recorded as follows: Dorsal the adults. The juvenile from Isla Popa (Fig. 2d) exhibits scales Verona Brown (223B), edged by Sepia (29); a Cream a conspicuous reddish flank colouration posterior to the 60 Correspondence forelimbs. All three juveniles share the bright yellow snout, ing through leaf litter in a patch of secondary forest in the but differ from each other in the extent of this colouration early afternoon. Reptile species encountered close to our posteriorly onto the dorsum. specimens of D. bilobatus either on Cerro Negro or Cerro Since all our adult specimens are females, the differenc- Mariposa, or (if marked with an asterisk) on both include: es observed among them are clearly due to individual vari- Ameiva festiva, A. quadrilineata, Anolis biporcatus*, A. fre- ation. Nevertheless, all our specimens’ colourations agree natus*, A. humilis*, A. insignis, A. limifrons*, A. lionotus*, with the generalized colouration traits given by Savage Atropoides nummifer*, Corytophanes cristatus*, Echinosau- (2002: pp. 530–). As suspected by Myers (973), coloura- ra panamensis, Imantodes cenchoa*, Ninia maculata, Oxy- tion obviously changes drastically during ontogenesis. belis brevirostris*, Pliocercus euryzonus*, Ptychoglossus pli- catus, Sibon annulatus*, S. nebulatus, and Spilotes pullatus. Apart from the fact that only two of our seven speci- Natural history mens possess complete tails, our most remarkable obser- vation concerns a blatant discontinuity in the perceivable The four adult females were encountered between 20:5 abundance of this lizard: While six individuals (more than and 20:40 hrs.
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