Biodiversity Literature Repository
Published December 15, 2022 | Version v1
Taxonomic treatment Open

Clarella Howell 1933

Creators

  • 1. Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg (Germany) and Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, 44801 Bochum (Germany)
  • 2. Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg (Germany)

Description

Genus Clarella Howell, 1933

Clarella Howell, 1933: 219. —

Type species: Anapolenus venustus Billings, 1872, designated as lectotype by Howell (1933).

DIAGNOSIS. — Glabella with great forward expansion anterior of S1; palpebral lobes slightly sigmoidal, reaching almost genal angle; thorax with 15 segments; pygidium without border, up to four pairs of marginal spines; short axis with one to two axial rings (based on Howell 1933; Whittington et al. 1997, with modifications).

REMARKS

Clarella is distinguished from Anapolenus Salter, 1864a by sigmoidally shaped palpebral lobes that almost reach the genal angle. The palpebral lobes of Anapolenus curve in a uniform arc, reaching the genal angle. The pygidium of Clarella lacks a border, while that of Anapolenus is bordered (Howell 1933; Whittington et al. 1997).

Notes

Published as part of Unger, Tanja, Hildenbrand, Anne, Stinnesbeck, Wolfgang & Austermann, Gregor, 2022, Biostratigraphy and taxonomy of polymerid trilobites of the Manuels River Formation (Drumian, middle Cambrian), Newfoundland, Canada, pp. 1051-1087 in Geodiversitas 44 (33) on page 1075, DOI: 10.5252/geodiversitas2022v44a33, http://zenodo.org/record/7477657

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Linked records

Additional details

Identifiers

URL
http://treatment.plazi.org/id/03DA87B6FF8D4956FE827BEEFE4AFA01

Is part of
Journal article: 10.5252/geodiversitas2022v44a33 (DOI)
Journal article: http://zenodo.org/record/7477657 (URL)
Journal article: http://publication.plazi.org/id/FFE3FFCEFF97494CFFAA7878FFDCFFC1 (URL)
Journal article: http://zoobank.org/urn:lsid:zoobank.org:pub:4DA9802D-9500-4FD8-96F5-F4DD3BBF56A3 (URL)
Is source of
https://sibils.text-analytics.ch/search/collections/plazi/03DA87B6FF8D4956FE827BEEFE4AFA01 (URL)
https://www.gbif.org/species/207934021 (URL)
https://www.checklistbank.org/dataset/56143/taxon/03DA87B6FF8D4956FE827BEEFE4AFA01.taxon (URL)

Biodiversity

Family
Centropleuridae
Genus
Clarella
Kingdom
Animalia
Order
Redlichiida
Phylum
Arthropoda
Scientific name authorship
Howell
Taxon rank
genus
Taxonomic concept label
Clarella Howell, 1933 sec. Unger, Hildenbrand, Stinnesbeck & Austermann, 2022

References

  • HOWELL B. F. 1933. - The classification of the trilobite Subfamily, Centropleurinae. Meddelelser fra Dansk Geologisk Forening 8 (3): 215 - 219.
  • BILLINGS E. 1872. - On some fossils from the primordial rocks of Newfoundland. Canadian Naturalist and Quarterly Journal of Science 6: 465 - 479. https: // doi. org / 10.5962 / bhl. title. 38279
  • WHITTINGTON H. B., CHATTERTON B. D. E., SPEYER S. E., FORTEY R. A., OWENS R. M., CHANG W. T., DEAN W. T., JELL P. A., LAURIE J. R., PALMER A. R., REPINA L. N., RUSHTON A. W. A., SHERGOLD J. H., CLARKSON E. N. K., WILMONT N. V. & KELLY S. R. A., 1997. - Treatise on Invertebrate Paleontology, Part O, Arthropoda 1, Trilobita, Revised. Geological Society of America and University of Kansas, Boulder, Colorado, and Lawrence, Kansas, 530 p.
  • SALTER J. W. 1864 a. - On some new fossils from the Lingula-flags of Wales. The Quarterly Journal of the Geological Society 20: 233 - 241. https: // doi. org / 10.1144 / gsl. jgs. 1864.020.01 - 02.33