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      A new dwarf chameleon, genus Brookesia, from the Marojejy massif in northern Madagascar

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      Zoosystematics and Evolution
      Pensoft Publishers

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          Abstract

          We describe a new species of dwarf chameleon from the Brookesia minima species group. Brookesia tedi sp. n. occurs above 1300 m above sea level on the Marojejy massif in northeastern Madagascar. It is genetically sister to B. peyrierasi, a species occurring in lowlands around the Baie de Antongil, but is genetically strongly divergent from that species in both nuclear (c-mos) and mitochondrial (16S, ND2) genes, and morphologically in its smaller size and distinctly different hemipenis. It is the second species of the B. minima species group from Marojejy National Park, but is not known to occur in syntopy with the other species, B. karchei, due to elevational segregation.

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          Miniaturization of Body Size: Organismal Consequences and Evolutionary Significance

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            Two novel gene orders and the role of light-strand replication in rearrangement of the vertebrate mitochondrial genome

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              Large-scale phylogeny of chameleons suggests African origins and Eocene diversification.

              Oceanic dispersal has emerged as an important factor contributing to biogeographic patterns in numerous taxa. Chameleons are a clear example of this, as they are primarily found in Africa and Madagascar, but the age of the family is post-Gondwanan break-up. A Malagasy origin for the family has been suggested, yet this hypothesis has not been tested using modern biogeographic methods with a dated phylogeny. To examine competing hypotheses of African and Malagasy origins, we generated a dated phylogeny using between six and 13 genetic markers, for up to 174 taxa representing greater than 90 per cent of all named species. Using three different ancestral-state reconstruction methods (Bayesian and likelihood approaches), we show that the family most probably originated in Africa, with two separate oceanic dispersals to Madagascar during the Palaeocene and the Oligocene, when prevailing oceanic currents would have favoured eastward dispersal. Diversification of genus-level clades took place in the Eocene, and species-level diversification occurred primarily in the Oligocene. Plio-Pleistocene speciation is rare, resulting in a phylogeny dominated by palaeo-endemic species. We suggest that contraction and fragmentation of the Pan-African forest coupled to an increase in open habitats (savannah, grassland, heathland), since the Oligocene played a key role in diversification of this group through vicariance.
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                Author and article information

                Journal
                Zoosystematics and Evolution
                ZSE
                Pensoft Publishers
                1860-0743
                1435-1935
                March 06 2019
                March 06 2019
                : 95
                : 1
                : 95-106
                Article
                10.3897/zse.95.32818
                bb50e78d-c6cf-4a4d-87ce-8194a7b56121
                © 2019

                http://creativecommons.org/licenses/by/4.0/

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