Island Evolution and Systematic Revision of Comoran Snakes: Why and When Subspecies Still Make Sense

摘要: Species delimitation and species concepts have been a matter of debate among biodiversity researchers in the last decades, resulting integrative taxonomy approaches use modern concepts, such as phylogenetic, evolutionary or general lineage concepts. The discussion subspecies status has addressed much less extensively, with some completely refraining from recognizing subspecies. However, allopatric insular populations that are particularly differentiated traditionally assigned status. We studied molecular phylogeny morphology endemic Comoran tree snakes genus Lycodryas. Taking an taxonomic approach, we used concept independent lines evidence to discriminate between for specific subspecific Molecular (mtDNA) morphological data provided sufficient support four different taxa within In revision this group, propose two species, each present strong sexual dichromatism unique Lycodryas related genera may be explained by selection combination absence major predators. Then, discuss effects evolution “island rule” on traits Liophidium mayottensis, another snake Comoros. larger-bodied promoted increase body size number dorsal scale rows these species. Finally, concept, its applications significance limiting inflation. emphasize taxon descriptions should based approach using several evidence, preferably statements underlying operational criteria, objectivity comparability descriptions.