ON THE FOSSIL ANASPIDACEA, WITH A REVISION OF THE CLASSIFICATION OF THE SYNCARIDA BY H. K. BROOKS Department of Geology, University of Florida, Gainesville, Florida, U.S.A. 1) INTRODUCTION The taxon Syncarida was originally proposed as a "synthetic group" on the basis of Packard's (1886) study of a Pennsylvanian fossil, Acayathotel.ro?z .rtim p- soni Meek & Worthen, from Illinois. At the time of Meek & Worthen's last description (1868) and Packard's revision, the most closely analogous known extant crustacea were the Isopoda and Amphipoda. The principal diagnostic characteristics of Acanthotelson, and thus of the Syncarida, as presented by Packard were the absence of a carapace and loss of the first thoracic tergite through fusion. Though reduced, the first thoracic tergite is present. It can be easily distinguished as a separate skeletal element on the specimens studied by Packard. With the discovery of the recent "Tasmanian mountain shrimp", Ana.rpide.r tasmania (Thomson, 1893), which has the first thoracic somite incorporated into the head, Calman (1896) established the Syncarida as an order. It was extended to include other fossils such as Palaeocari.c which were known to have the first thoracic somite free. Subsequently several recent genera have been discovered. In his later
Crustaceana – Brill
Published: Jan 1, 1962
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