By Stefan Koenemann, Ronald Jenner
In comparison to different arthropods, crustaceans are characterised through an remarkable disparity of physique plans. regularly, the specialization of arthropod segments and appendages into specified physique areas has served as a handy foundation for better type; even if, many relationships in the phylum Arthropoda nonetheless stay debatable. Can Crustacea also be thought of a monophyletic crew? if this is the case, then that are their closest relations in the Arthropoda? The solutions to questions similar to those will play a key position in figuring out styles and methods in arthropod evolution, together with the disappearance of sure physique plans from the fossil checklist, in addition to incidences of transition from aquatic to terrestrial environments. Crustacea and Arthropod Relationships, written through a workforce of the world over well-known specialists, offers a wide selection of viewpoints, whereas delivering an up to date precis of modern growth throughout a number of disciplines. With wealthy element and vibrancy, it addresses the evolution and phylogenetic relationships of the Arthropoda established upon molecular, developmental, morphological, and paleontological proof. quantity sixteen is the 1st within the sequence not to be solely devoted to discussions particular to crustaceans. whereas it's nonetheless crustaceo-centric, the concentration of this quantity has been prolonged to incorporate different teams of arthropods besides the Crustacea. This wider concentration bargains difficult possibilities to guage higher-level relationships in the Arthropoda from a carcinologic point of view. This quantity is devoted to the occupation of Frederick R. Schram, the founding editor of CrustaceanIssues in 1983, in acceptance of his many stimulating and wide-ranging contributions to the evolutionary biology of arthropods normally, and of crustaceans particularly.
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Extra info for Crustacea and Arthropod Relationships (Crustacean Issues)
Subsequent generic appearances were Oligocene or later in this extant group. Homolodromia, the one genus that crossed the K/P boundary and which is extant, was likely the founder for subsequent taxa. Both Homolidae and Homolodromiidae exhibit features typical of the ecological generalists described by Kauffman & Harries (1996). They possess primitive features within their lineage, and each embrace a single taxon that survived into the Palaeogene which exhibited morphological features suggesting ancestral affinities for subsequent taxa.
London: Nat. Hist. Mus. and Cambridge Univ. Press. D. 1852. Crustacea, Pt. 1. , Vol. 13: 685 pp. Davidson, E. 1966. A new Paleocene crab from Texas. J. Paleontol. 40: 211-213. De Angeli, A. & Beschin, C. 2001. I crostacei fossili del territorio Vicentino. Natura Vicentina 5: 554. De Angeli, A. & Garassino, A. 2002. Galatheid, chirostylid and porcellanid decapods (Crustacea, Decapoda, Anomura) from the Eocene and Oligocene of Vicenza (N Italy). Mem. Soc. ital. Sci. nat. Mus. civ. St. nat. Milano 30 (3): 1-40.
The same pattern is seen in at least two other high-latitude decapod localities. Ekdale & Bromley (1984) reported little change in abundance of ichnofossils attributed to arthropods across the K/P boundary in Denmark, and Collins & Jakobsen (1994) reported that 66% of the decapod genera in Denmark and Sweden survived from the Maastrichtian into the Danian. Fraaije (2003) reported that over half of the genera known from the Maastrichtian type area survived into the Palaeogene. Similarly, in Maastrichtian and Danian rocks of southern Argentina, all of the genera present in the Maastrichtian crossed the K/P boundary (Feldmann et al.