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Titolo:
Revision of the late Ordovician trilobite Holotrachelus punctillosus (Tornquist, 1884) from Dalarna, Sweden
Autore:
Suzuki, Y;
Indirizzi:
Natl Sci Museum, Shinjuku Ku, Tokyo 1690073, Japan Natl Sci Museum TokyoJapan 1690073 m, Shinjuku Ku, Tokyo 1690073, Japan
Titolo Testata:
ACTA PALAEONTOLOGICA POLONICA
fascicolo: 3, volume: 46, anno: 2001,
pagine: 331 - 348
SICI:
0567-7920(200108)46:3<331:ROTLOT>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CUTICULAR TERRACES;
Keywords:
Trilobita; Holotrachelus; Proetida; Cheiruridae; Sphaerexochinae; Ordovician; Sweden;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Suzuki, Y Natl Sci Museum, Shinjuku Ku, 3-23-1 Hyakunincho, Tokyo 1690073,Japan Natl Sci Museum 3-23-1 Hyakunincho Tokyo Japan 1690073 3, Japan
Citazione:
Y. Suzuki, "Revision of the late Ordovician trilobite Holotrachelus punctillosus (Tornquist, 1884) from Dalarna, Sweden", ACT PAL POL, 46(3), 2001, pp. 331-348

Abstract

Holotrachelus punctillosus from the Boda Limestone (Ashgill, Upper Ordovician) of Sweden is redescribed. The systematic position of this problematic species is discussed, Its distinctive morphology appears to be the result of an adaptation towards illaenid life habits. The pygidial morphology, withthe extra-fulcral field developed as segmental pleural spines, makes an assignment possible to only four Ordovician groups, namely the Remopleuridioidea, Odontopleuroidea, Lichoidea and Cheiruroidea. Of these, the former three are so different that a direct affiliation is out of the question. Similarities with the Cheiruroidea are the more persuasive, particularly after amisinterpretation of the facial suture is corrected and some other problems are sorted out. It is suggested that the Holotrachelinae are placed within the Cheiruridae, where it may have special affinities to the Sphaerexochinae.

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Documento generato il 27/09/20 alle ore 22:05:18