Results 111 to 120 of about 205 (136)

FIRST CARBONIFEROUS PROTASPID LARVAE (TRILOBITA)

Journal of Paleontology, 2005
Abstract The recovery of well-preserved silicified larvae from the early Tournaisian of Montagne Noire, southern France, allows the first description of the early ontogeny of proetoid trilobites, survivors of the end-Devonian Hangenberg extinction event.
RUDY LEROSEY-AUBRIL, RAIMUND FEIST
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Ordovician Pterygometopidae (Trilobita) of North America

Canadian Journal of Earth Sciences, 1982
Pterygometopidae are common trilobites in Middle and Upper Ordovician rocks of North America, northern Europe, and Siberia and they have considerable biogeographic usefulness. The subfamilies Pterygometopinae and Chasmopinae characterize Baltica, the Eomonorachinae characterizes Laurentia, and the Monorakinae characterizes Siberia.
Rolf Ludvigsen, Brian D. E. Chatterton
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Revision der GattungXenadoche (Trilobita; Unter-Karbon)

Senckenbergiana lethaea, 2000
Die GattungXenadoche Hahn & Hahn 1982 umfast sechs Arten:X. dido Hahn & Hahn 1982,X. kalliroe Hahn, Hahn & Muller 1996,X. agenor n. sp.,X. elissa n. sp.,X. pygmalion n. sp. undX. xenopyx n. sp. Ihre stratigraphische Verbreitung beschrankt sich auf das Erdbachium, cu II γ, von Hessen (Steeden, Erdbach ...
Gerhard Hahn, Renate Hahn, Peter Müller
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The trilobita as a natural group

Historical Biology, 1989
It has been claimed that olenellids, long regarded as trilobites, are more closely related to chelicerates than to the rest of the trilobite clade (Lauterbach 1980). This was based on an interpretation of the homologies of segmental arrangement in the thorax, and of the thoracic axial spine.
R.A. Fortey, H.B. Whittington
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Evolutionary radiations In the Trilobita

1991
Abstract Radiations have been understood in several ways; the trilobites have a good fossil record which can be used to examine these different usages. Supposed radiations in the sense of accelerated cladogenesis (especially involving higher taxa) are discussed at two important times: the basal Cambrian radiation; and the basal ...
R A Fortey, R M Owens
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Ontogeny and relationships of Trinucleoidea (Trilobita)

Journal of Paleontology, 1994
Protaspides and later growth stages are described and discussed for the Ordovician trinucleid trilobite Cryptolithus tesselatus Green and the raphiophorid Lonchodomas chaziensis Shaw. A small triangular rostral plate is described for a single protaspid instar in both Cryptolithus and Lonchodomas.
Brian D. E. Chatterton, Gregory D. Edgecombe, Stephen E. Speyer, Allen S. Hunt, Richard A. Fortey   +4 more
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Onnia (Trilobita) from Venezuela

1954
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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LICHIDAE (TRILOBITA): MORPHOLOGY AND CLASSIFICATION

Journal of Paleontology, 2002
Abstract Morphology is reviewed with special reference to the doublure and thoracic characters; a reconstruction of Richterarges aquilonius is used to suggest possible lichid anatomy. The relatively large hypostome and wide doublure, and the thorax with, or without, the strongly convex posterior pleural bands characterize lichids, in addition to the ...
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Trilobita

2007
Los trilobites fueron artrópodos marinos paleozoicos, provistos de una cutícula dorsal mineralizada (exoesqueleto) y fosilizable, la que permitió que tengan gran representación en el registro fósil. Desde que aparecen en el Cámbrico Temprano, su diversidad alcanzó valores elevados en el Cámbrico Tardío-Ordovícico, para decrecer durante el Silúrico ...
Tortello, Marcelo Franco, Waisfeld, Beatriz G., Vaccari, Norberto E.   +2 more
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Thysanopeltidae (Trilobita) from the British Devonian

1966
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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