RESUMO
The systematic study of biodiversity underlies appropriate inference in most other fields of biological research, yet it remains hampered by disagreements on both theoretical and empirical issues such as the species concept and the operational diagnosis of a species. Both become particularly challenging in those lineages where morphological traits are evolutionarily constrained by their adaptive value. For instance, cryptic organisms often conserve or converge in their external appearance, which hinders the recognition of species boundaries. An integrative approach has been adopted to study microgeographic variation in the leaf-litter lizard Pholidobolusvertebralis and test three predictions derived from the evolutionary species concept. Molecular data provided unambiguous evidence of divergence among the three recovered new clades and a common evolutionary history for each of them. The broadly sympatric clades were indeed diagnosable from externally visible traits, such as head scales, adult size, and sexually dimorphic ventral colouration. Also, they barely overlapped on the phenotypic space that summarised 39 morphometric and meristic traits. These clades are described as three species and an available name is suggested for a recovered fourth clade. The geographic distribution of the new and proximate species suggests a role for elevation on evolutionary divergence; it also raises interesting questions on the speciation pattern of an otherwise underestimated cryptic lineage.
RESUMO
The genus Anadia (family Gymnophthalmidae) consists of 19 species. It has remained almost taxonomically stable for decades, scarcely observed, in addition to being one of the less sampled gymnophthalmid genera with respect to molecular phylogenies. New Anadia species are discovered at a relatively low pace, and few specimens are found in the field, probably due to the arboreal habits of many low and mid elevation species. We describe here a new species of Anadia from the cloud forests of northwestern Colombia: the new species is easily diagnosed by the combination of shape and imbrication of dorsal scales, very large body size, the largest within its group, and large and non-overlapping number of longitudinal scale rows around midbody. We also tested the phylogenetic position of the recently described and geographically close A. antioquensis. A phylogenetic analysis based on four genomic regions recovered the new species as sister to A. buenaventura, whereas A. antioquensis was reassigned to the genus Riama. The new species is currently known from only three specimens, collected throughout eight years within less than 5 ha of the Mesenia-Paramillo Nature Reserve. Although its apparent rarity may be due to secretive habits, the species is provisionally declared vulnerable, while new information is available. To stimulate further research on this genus, we also compiled and present here the comparable information on the distribution and morphology of Anadia species. Altogether, the results stress the urge for a new review of the genus with the help of molecular data.
Assuntos
Lagartos , Animais , Tamanho Corporal , Colômbia , Florestas , FilogeniaRESUMO
The Terrarana frogs of the genus Pristimantis are acknowledged for their direct development into froglets and for their astonishing species richness, which renders it the anuran genus with the highest number of species. We describe a new species of Pristimantis from the northwestern Andes of Colombia. The species is distributed from an area between 2750-2900 m.a.s.l. in the Mesenia-Paramillo Nature Reserve. Pristimantis postducheminorum sp. nov. differs from other, phylogenetically related, or similar resembling Pristimantis taxa by a striking yellow coloration in the ventral area, dark grey coloration in the concealed surfaces of the thighs and groin, absence of nuptial pads, presence of lateral fringes on fingers, presence of vomerine odontophores triangular in shape from the ventral view, and absence of dorsolateral folds. Molecular phylogenetics place this new species close to P. satagius and therefore within the P. ridens species group. The new species is also phylogenetically close and sympatric with the recently described P. ferwerdai, which further indicates that the Pristimantis fauna has been notoriously underestimated in the Colombian western cloud forests, a fact that should be considered in assessments of environmental impact.