Results 1 to 10 of about 81 (49)
Moulting Patterns in Trilobites from the Devonian of Paraná Basin [PDF]
Terr@ Plural, 2021 In general, trilobites had their moulting performed by the breakdown of the librigena, a region (more external) situated on the cephalon of those animals.
Ariane Daniele Piccoli +3 more
doaj +4 more sources
Inferring ancestral range reconstruction based on trilobite records: a study-case on Metacryphaeus (Phacopida, Calmoniidae). [PDF]
Sci Rep, 2018 AbstractMetacryphaeus is a calmoniid trilobite genus from the Devonian Malvinokaffric Realm, exclusive to the Gondwanan regions. It includes eleven species, which are for the first time included here in a single phylogenetic analysis. The resulting hypotheses establish relations among the Metacryphaeus species with few ambiguities, also suggesting the ...
Carbonaro FA +4 more
europepmc +5 more sources
The occurrence of Phacopida trilobites from Pimenteira Formation at João Costa, Piauí, Brazil [PDF]
Geologia USP. Série Científica, 2013 The marine macroinvertebrate fossils from the Devonian of the Parnaíba Basin are among the most diverse of Paleozoic of Brazil. In recent years, most revisions on these fossils involved trilobites from the Pimenteira and Cabeças formations, in the ...
Juliana de Moraes Leme +3 more
doaj +4 more sources
Ameghiniana, 2016 Abstract. Calmoniid trilobites of the “Metacryphaeus tuberculatus group” occur in many Devonian localities within the Malvinokaffric Realm. In the Parnaiba Basin, in northeastern Brazil, the group is represented by Metacryphaeus tuberculatus Kozlowski, 1923, and M.
Van Enck Meira, Felipe +3 more
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Revisão sistemática dos Calmoniidae (Trilobita, Phacopida) da Formação Ponta Grossa, Devoniano, Bacia do Paraná, Brasil [PDF]
, 2022 Uma revisão sistemática dos Calmoniidae (Trilobita, Phacopida) da Formação Ponta Grossa, Devoniano, Sub-bacia Apucarana, Bacia do Paraná é apresentada.
Di Stasi, Andre Mori
openaire +4 more sources
Metacryphaeus rotundatus, um Novo Elemento da Fauna de Trilobites Calmoniidae (Phacopida), da Formação Ponta Grossa (Devoniano), Bacia do Paraná, Brasil [PDF]
Geologia USP. Série Científica, 2008 Trilobites Calmoniidae (Delo, 1935) constituem o grupo de Phacopida mais abundante e diversificado do registro fóssilda Formação Ponta Grossa, Devoniano, Sub-bacia Apucarana.
Sabrina Pereira Soares +2 more
doaj +3 more sources
Systematics and biogeography of the “Malvinella group,” Calmoniidae (Trilobita, Devonian)
Journal of Paleontology, 1991 Phylogenetic parsimony analysis forms a basis for classification of the Siegenian–Eifelian “Malvinella group,” a monophyletic taxon within the “Metacryphaeus group” of the family Calmoniidae. Fifty-one exoskeletal characters for Metacryphaeus Reed and 12 taxa of the “Malvinella group” yield a shortest length cladogram with a consistency index of 0.51 ...
Bruce S. Lieberman +2 more
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Journal of Paleontology, 1993 Phylogenetic parsimony analysis was used to classify the Siegenian–Eifelian “Metacryphaeus group” of the family Calmoniidae. Thirty-eight exoskeletal characters for 16 taxa produced a shortest-length cladogram with a consistency index of 0.49. A classification based on retrieving the structure of this cladogram recognizes nine genera: Typhloniscus ...
Bruce S. Lieberman
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Some of the next articles are maybe not open access.
Lethaia, 1987
A re-examination of the trilobite Baniaspis globosa Destombes (Phacopina) from the Ashgill of the Anti-Atlas (Morocco) shows that it has several derived characters which allow us to classify it in the family Calmoniidae. Calmoniids were characteristic members of the Malvino-Kaffric province during the Lower Devonian. Hence we regard the origins of this
JACQUES Destombes ET, JEAN-LOUIS Henry
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A re-examination of the trilobite Baniaspis globosa Destombes (Phacopina) from the Ashgill of the Anti-Atlas (Morocco) shows that it has several derived characters which allow us to classify it in the family Calmoniidae. Calmoniids were characteristic members of the Malvino-Kaffric province during the Lower Devonian. Hence we regard the origins of this
JACQUES Destombes ET, JEAN-LOUIS Henry
openaire +1 more source
Trait-based diversification shifts reflect differential extinction among fossil taxa [PDF]
, 2014 Evolution provides many cases of apparent shifts in diversification associated with particular anatomical traits. Three general models connect these patterns to anatomical evolution: (i) elevated net extinction of taxa bearing particular traits, (ii ...
Estabrook, George F., Wagner, Peter J.
core +6 more sources