Published May 7, 2019 | Version v1
Taxonomic treatment Open

Cloacaspis Fortey 1974

Description

Cloacaspis Fortey, 1974

TYPE SPECIES: Cloacaspis senilis Fortey, 1974.

EMENDED DIAGNOSIS: Balnibarbiine trilobites with facial sutures moderately divergent in front of eyes. Pits present on internal mold of anterior border furrow, and may also expressed on the dorsal surface. Frontal area relatively short (sag.), ranging from 10%–20% of the total cranidial sagittal length. Glabella with four pairs of glabellar furrows of balnibarbiinae type: 1P extends posterolaterally from axial furrow before turning abruptly posteriorly; 2P straight, extending posterolaterally from axial furrow, or curving slightly posteriorly; 3P straight, short, transverse, not reaching axial furrow; 4P straight, short, slightly oblique, not reaching axial furrow. 3P and 4P tend to be longer than in other balnibarbiine genera (Balnibarbi species), and 4P is more weakly expressed than other furrows. Postocular fixed cheeks triangular. Posterior border of free cheek curves forward to long genal spine. Pygidium small, with two to three axial rings. Posterior border of pygidium may bear short spines.

INCLUDED SPECIES: Cloacaspis senilis Fortey, 1974; Cloacaspis ceryx (Fortey, 1974); Cloacaspis dejecta Fortey, 1974; Cloacaspis ekphymosa Fortey, 1974; Cloacaspis tesselata Fortey and Droser, 1999.

Notes

Published as part of Hopkins, Melanie J., 2019, Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae), pp. 1 in American Museum Novitates 2019 (3928) on page 1, DOI: 10.1206/3928.1, http://zenodo.org/record/5369854

Files

Files (1.7 kB)

Name Size Download all
md5:b0cd6e5758ba9b727b04c6c7dd8f23be
1.7 kB Download

System files (9.2 kB)

Name Size Download all
md5:4bf9dd420a6c7644de5dfc6fa0a26405
9.2 kB Download

Linked records

Additional details

Biodiversity

Collection code
SPECIES
Family
Olenidae
Genus
Cloacaspis
Kingdom
Animalia
Order
Ptychopariida
Phylum
Arthropoda
Scientific name authorship
Fortey
Taxon rank
genus
Type status
holotype
Taxonomic concept label
Cloacaspis Fortey, 1974 sec. Hopkins, 2019

References

  • Fortey, R. A. 1974. The Ordovician trilobites of Spitsbergen. I. Olenidae. Norsk Polarinstitutt Skrifter 160: 1 - 129.
  • Fortey, R. A., and M. L. Droser. 1999. Trilobites from the base of the type Whiterockian (Middle Ordovician) in Nevada. Journal of Paleontology 73 (2): 182 - 201.