Paradoxides davidis, from here.

Belongs within: Trilobita.

The Redlichiina are a group of relatively plesiomorphic trilobites known from the Lower and Middle Cambrian (Harrington et al. 1959). Some members of this group grew very large; the Middle Cambrian North American species Paradoxides davidis was almost two feet long (Prothero 1998).

Characters (from Harrington et al. 1959): Dorsal exoskeleton elongate, subelliptical in outline. Cephalon semicircular to semielliptical, mostly with prominent genal spines; glabella with subparallel sides, narrowing fonvard, or expanding fonvard, generally well segmented; facial sutures opisthoparian; eyes mostly large, tending to be crescentic. Thorax with numerous segments. Pygidium small.

<==Redlichiina [Redlichiacea]
    |--Centropleura P79
    |--Redlichia ZS01
    |    |--R. chinensis P79
    |    `--R. takooensis ZS01
    |--Eoredlichia intermedia (Lu 1940) FO99, CB04
    `--Paradoxides P98
         |--P. abenacus A38
         |--P. bennetti (Salter 1859) [=Eccaparadoxides bennetti] F05
         |--P. bohemicus H04
         |--P. davidis P98
         |--P. eteminicus [=Eccaparadoxides eteminicus] F05
         |--P. forchhammeri P79
         |--P. gracilis FO99
         |--P. groomi A38
         |--P. harlani (Green 1834) [=Hydrocephalus harlani] F05
         |--P. hicksi A38
         |--P. intermedius F05
         |--P. lamellatus A38
         |--P. matthewi A38
         |--P. (Acadoparadoxides) mureroensis Sdzuy 1968 P79, SS84
         |--P. paradoxissimus P79
         |--P. pinus [=Plutonides pinus] F05
         `--P. spinosus T10

*Type species of generic name indicated


[A38] Alcock, F. J. 1938. Geology of Saint John region, New Brunswick. Geological Survey of Canada Memoir 216: 1–65.

[CB04] Cotton, T. J., & S. J. Braddy. 2004. The phylogeny of arachnomorph arthropods and the origin of the Chelicerata. Transactions of the Royal Society of Edinburgh: Earth Sciences 94: 169–193.

[F05] Fletcher, T. P. 2005. Holaspid variation in the solenopleurid trilobite Parasolenopleura gregaria (Billings, 1865) from the Cambrian of Newfoundland. Palaeontology 48 (5): 1075–1089.

[FO99] Fortey, R. A., & R. M. Owens. 1999. Feeding habits in trilobites. Palaeontology 42 (3): 429–465.

[H04] Haeckel, E. 1899–1904. Kunstformen der Natur. Bibliographisches Institut: Leipzig und Wien.

Harrington, H. J., G. Henningsmoen, B. F. Howell, V. Jaanusson, C. Lochman-Balk, R. C. Moore, C. Poulsen, F. Rasetti, E. Richter, R. Richter, H. Schmidt, K. Sdzuy, W. Struve, C. J. Stubblefield, R. Tripp, J. M. Weller & H. B. Whittington. 1959. Trilobita. In: R. C. Moore (ed.) Treatise on Invertebrate Paleontology pt O. Arthropoda 1, pp. O38-O540. Geological Society of America and University of Kansas Press.

[P79] Palmer, A. R. 1979. Cambrian. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A119–A135. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[P98] Prothero, D. R. 1998. Bringing Fossils to Life: An introduction to paleobiology. WCB McGraw-Hill: Boston.

[SS84] Shergold, J. H., & K. Sdzuy. 1984. Cambrian and early Tremadocian trilobites from Sultan Dağ, central Turkey. Senckenbergiana Lethaea 65 (1–3): 51–135.

[T10] Taylor, T. G. 1910. The Archaeocyathinae from the Cambrian of South Australia with an account of the morphology and affinities of the whole class. Memoirs of the Royal Society of South Australia 2 (2): 55–188.

[ZS01] Zhang, X., D. Shu, Y. Li & J. Han. 2001. New sites of Chenjiang fossils: crucial windows on the Cambrian explosion. Journal of the Geological Society 158: 211–218.

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