|Malacostracan phylogeny and evolution|
Dahl, E. (1983). Malacostracan phylogeny and evolution, in: Schram, F.R. (Ed.) Crustacean phylogeny. Crustacean Issues, 1: pp. 189-212
In: Schram, F.R. (Ed.) (1983). Crustacean phylogeny. Crustacean Issues, 1. A.A. Balkema: Rotterdam, The Netherlands. ISBN 90-6191-231-8. 372 pp., more
In: Schram, F.R. (Ed.) Crustacean Issues. Balkema/CRC Press/Taylor & Francis: Rotterdam. ISSN 0168-6356, more
Malacostracan ancestors were benthic-epibenthic. Evolution of ambulatory stenopodia probably preceded specialization of natatory pleopods. This division of labor was the prerequisite for the evolution of trunk tagmosis. It is concluded that the ancestral malacostracan was probably more of a pre-eumalacostracan than a phyllocarid type, and that the phyllocarids constitute an early branch adapted for benthic life. The same is the case with the hoplocarids, here regarded as a separate subclass with eumalacostracan rather than phyllocarid affinities, although that question remains open. The systematic concept Eumalacostraca is here reserved for the subclass comprising the three caridoid superorders, Syncarida, Eucarida and Peracarida. The central caridoid apomorphy, proving the unity of caridoids, is the jumping escape reflex system, manifested in various aspects of caridoid morphology . The morphological evidence indicates that the Syncarida are close to a caridoid stem-group, and that the Eumalacostraca sensu stricto were derived from pre-syncarid ancestors. Advanced hemipelagic-pelagic caridoids probably evolved independently within the Eucarida and Peracarida.