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The evolutionary significance of introgression has been discussed for decades. Questions about potential impacts of transgene… Expand Comparative morphology currently permits no unambiguous decision on the primary homology of the nephridia of Annelida and… Expand AbstractThe Phosphatocopina were long considered as the oldest, Cambrian, record of ostracode Crustacea. However, our detailed… Expand The recent explosion of phylogenetic information has had an impact far beyond the eld of systematic biology. Workers in a… Expand Ossicles of Holothuria (Metriatyla) scabra Jaeger 1833 vary mainly in early juveniles between 0.9 and 15mm long. While ossicles… Expand A phylogeny describes the hierarchical pattern of descent of some group of species from a common ancestor. If information is… Expand ICHTHYOSAURS are extinct marine reptiles, probably belonging to the Diapsida1, that ranged from the Early Triassic to Late… Expand It has been claimed that quantified features are inappropriate for phylogenetic anal- ysis. We consider that claim to be true… Expand In the last 15 years understanding of the higher systematics of Araneae has changed greatly. Large classical superfamilies and… Expand Three major arguments have been raised against the crucial claim, documented by Whit- tington and colleagues for the Burgess… Expand