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Titolo:
THE ENCRINURUS-VARIOLARIS-PLEXUS (TRILOBITA, SILURIAN) - RELATIONSHIPS OF LLANDOVERY SPECIES
Autore:
EDGECOMBE GD; RAMSKOLD L;
Indirizzi:
AUSTRALIAN MUSEUM,DIV EARTH & ENVIRONM SCI,6 COLL ST SYDNEY NSW 2000 AUSTRALIA UPPSALA UNIV,MUSEUM PALEONTOL S-75236 UPPSALA SWEDEN
Titolo Testata:
Geobios
fascicolo: 2, volume: 29, anno: 1996,
pagine: 209 - 233
SICI:
0016-6995(1996)29:2<209:TE(S-R>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MACKENZIE MOUNTAINS;
Keywords:
TRILOBITA; ENCRINURINAE; SILURIAN; CLADISTICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
63
Recensione:
Indirizzi per estratti:
Citazione:
G.D. Edgecombe e L. Ramskold, "THE ENCRINURUS-VARIOLARIS-PLEXUS (TRILOBITA, SILURIAN) - RELATIONSHIPS OF LLANDOVERY SPECIES", Geobios, 29(2), 1996, pp. 209-233

Abstract

Phylogenetically basal, Llandovery parts of the diverse variolaris plexus of encrinurine trilobites have been assigned to a grade group, Nucleurus. Parsimony analysis of 24 exoskeletal characters for adequately known species of Nucleurus and allied post-llandovery taxa provides a phylogenetic scheme for reclassifying the base of the variolaris plexus. Nucleurus RAMSKOLD, 1986 is redefined with Aeronian-Telychian core and Rhuddanian-Aeronian stem groups (Nucleurus s.s. and s.l., respectively). Monophyletic groups in the shortest cladograms include Elsarella nov. gen. (Llandovery, east Baltic region) and an unnamed clade (Llandovery-Ludlow ?, Baltic region and Japan). Billevittia nov. gen. (Telychian, northern Laurentia) is the closest relative of a diverse post-llandovery radiation. Previously established east Baltic Llandovery species of the variolaris plexus are revised and illustrated. Most type specimens have been further prepared to show new details, and additional information is provided by new material. New species are Billevittia adraini and Encrinurus ralfi.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 09:06:56