The genus Dichaetophora Duda comprises 61 described species classified into four species groups: agbo, tenuicauda, acutissima and sinensis. This genus is distributed exclusively in the Old World, and is rich in species in the tropical and subtropical areas of the Oriental, Australasian, and Afrotropical regions. In this paper, a new species group, the trilobita group, is established for six new...

1 Objectives The primary objective of the proposed research is to develop improved methods for likelihood-based phylogenetic analysis of morphological data with an emphasis on fossil taxa. Many analyses of molecular data use likelihood-based approaches, so the current lack of compelling models of character evolution for morphology is a serious impediment to integrating paleontological and neont...

The good fossil record of trilobite exoskeletal anatomy and ontogeny, coupled with information on their nonbiomineralized tissues, permits analysis of how the trilobite body was organized and developed, and the various evolutionary modifications of such patterning within the group. In several respects trilobite development and form appears comparable with that which may have characterized the a...