Linsang

Abstract: Although molecular studies have helped to clarify the phylogeny of the problematic family Viverridae, a recent phylogenetic investigation based on cytochrome b (cyt b ) has excluded the Asiatic linsangs (genus Prionodon ) from the family. To assess the phylogenetic position of the Asiatic linsangs within the Feliformia, we analysed an exhaustive taxonomic sample set with cyt b and newly produced transthyretin intron I sequences (TR–I–I). TR–I–I alone and cyt b +TR–I–I combined (maximum–likelihood analysis) highly support the position of Asiatic linsangs as sister–group of the Felidae. The estimation of minimum divergence dates from molecular data suggests a splitting event ca . 33.3 million years (Myr) ago, which lends support to historical assertions that the Asiatic linsangs are ‘living fossils’ that share a plesiomorphic morphotype with the Oligocene feliform Paleoprionodon . The African linsang is estimated to appear more than 20 Myr later and represents the sister–group of the genus Genetta . Our phylogenetic results illustrate numerous morphological convergences of ‘diagnostic’ characters among Feliformia that might be problematic for the identification of fossil taxa. The morphotype reappearance from the Asiatic to the African linsangs suggests that the genome of the Feliformia conserved its potential ability of expression for a peculiar adaptive phenotype throughout evolution, in this case arboreality and hypercarnivory in tropical forest.

Abstract: Gaubert, P., Tranier, M., Delmas, A.-S., Colyn, M. & Veron, G. (2004). First molecular evidence for reassessing phylogenetic affinities between genets (Genetta) and the enigmatic genet-like taxa Osbornictis, Poiana and Prionodon (Carnivora, Viverridae). —Zoologica Scripta, 33, 117–129. The subfamily Viverrinae is a composite group of carnivores comprising the large and plantigrade terrestrial civets (Civettictis, Viverricula and Viverra) and the slender and generally more arboreal genets and genet-like taxa (Genetta, Prionodon, Poiana, Osbornictis), both having Asiatic and African representatives. The problematic phylogenetic relationships between genets and genet-like taxa are addressed for the first time from a molecular perspective through complete cytochrome b gene sequences. We used a large taxonomic sample set including some very rare and crucial species such as Osbornictis piscivora, Poiana richardsonii (museum specimen material) and Genetta johnstoni. The results from parsimony, distance and maximum likelihood analyses do not support the monophyly of the Viverrinae and contradict previous morphological hypotheses. The Asiatic linsangs (Prionodon spp.) are excluded from the Viverrinae and represent either a basal Feliformia or Viverridae. The other genet-like taxa constitute a strongly supported monophyletic African group, in which the African linsang (represented by Poiana richardsonii) is a sister group to the genets. The aquatic genet Osbornictis piscivora is included within the latter clade, and the genus Osbornictis should be considered a junior synonym of Genetta. African and Asiatic terrestrial civets are monophyletic, but their phylogenetic affinities with the genet-like clade are inconclusive using our data set. On the basis of our molecular results, morphological convergences and adaptations to peculiar habitats and ways of life within genets and genet-like taxa are discussed.