Cloacaspis Fortey 1974

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...

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Bibliographic Details
Main Author: Hopkins, Melanie J.
Format: Text
Language:unknown
Published: Zenodo 2019
Subjects:
Biodiversity
Taxonomy
Animalia
Arthropoda
Trilobita
Ptychopariida
Olenidae
Cloacaspis
Norsk Polarinstitutt
Spitsbergen
Online Access:https://dx.doi.org/10.5281/zenodo.5461571
https://zenodo.org/record/5461571
Description
Summary: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. : 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 : {"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."]}

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