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Summary[edit] Description: English: Phylogeny of marrellomorph arthropods. Single MPT (most parsimonious tree) (CI = 0.941; RI = 0.941). Tree length is 17 steps with equally weighted characters. With implied weighting tree length equals 0.1667 (k = 5), 0.25 (k = 3) and 0.50 (k = 1). Numbers on the left of the branches indicate support values for jackknifing, and those in brackets are for symmetric resampling. Numbers on the right of branches indicate Bremer support values. Outgroup taxa are represented by trilobite Olenoides serratus. Date: 2013. Source: Rak, Š., Ortega−Hernández, J., Legg, D. A. (2013). A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic. Acta Palaeontologica Polonica 58 (3): 615–628. doi:10.4202/app.2011.0038. Author: Štěpán Rak, Javier Ortega−Hernández, David A. Legg.

Summary[edit] Description: Strabops thatcheri fossil aglaspidid from the Cambrian of Missouri, USA (YPM 9001, Yale University's Peabody Museum of Natural History, New Haven, Connecticut, USA). (centimeter scale at right) Aglaspidids are a rare group of fossil arthropods known only from the Cambrian and Ordovician. They had a phosphatic exoskeleton consisting of a head (cephalon), a multisegmented trunk, and a tailspine. The fossil shown above is the holotype specimen of Strabops thatcheri, which is the type species of Strabops, which is the type genus of Family Strabopidae. The high-level taxonomy of aglaspidids has been debated by paleontologists. The classification given below is from Hou & Bergstrom (1997). Classification: Animalia, Arthropoda, Schizoramia, Lamellipedia, Artiopoda, Aglaspidida, Strabopida, Strabopidae Stratigraphy: Potosi Dolomite, Upper Cambrian Locality: Flat River, Missouri, USA Reference cited: Hou & Bergstrom (1997) - Arthropoda from the Lower Cambrian Chengjiang fauna, southwest China. Fossils & Strata 45. 116 pp. Date: 13 March 2015, 01:05. Source: Strabops thatcheri fossil aglaspidid (Potosi Dolomite, Upper Cambrian; Flat River, Missouri, USA). Author: James St. John.