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Pyrimetopus pyrifrons

Trilobita - Trinucleida - Alsataspididae

Taxonomy
Orometopus pyrifrons was named by Harrington (1938). It is not extant.

It was recombined as Pyrimetopus pyrifrons by Pribyl and Vanek (1980), Waisfeld and Vaccari (2003) and Tortello and Esteban (2014).

Synonymy list
YearName and author
1938Orometopus pyrifrons Harrington
1957Orometopus pyrifrons Harrington and Leanza
1980Pyrimetopus pyrifrons Pribyl and Vanek p. 44
2003Pyrimetopus pyrifrons Waisfeld and Vaccari
2014Pyrimetopus pyrifrons Tortello and Esteban p. 944

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
Life
RankNameAuthor
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
subclassLibristoma
orderTrinucleida(Swinnerton 1915)
familyAlsataspididaeTurner 1940
familyOrometopidaeHupe 1955
genusPyrimetopus
speciespyrifrons(Harrington 1938)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Pyrimetopus pyrifrons Harrington 1938
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Diagnosis
ReferenceDiagnosis
A. Pribyl and J. Vanek 1980Exoskeleton small, slightly convex. Cephalon semielliptical in outline,
more convex in sagittal axis than transversely. Glabella strongly convex, globose, well-defined by deep axial furrows, ovoid in outline. A smooth minute mesial node lies slightly behind the centre of glabella. Anterior pits shallow. Preoccipital part of glabella not continuing posteriorly into a spine. Preglabellar field narrow, weakly convex, sloping forward; anterior border very narrow. Fixigenae narrow (tr.), convex. Alae inconspicuous. Anterior branches of facial sutures almost subparallel, slightly diverging in front of eyes, gently curved outward; posterior branches of facial sutures sigmoidally bent, directed outward and slightly forward behind eyes. Thorax consisting
of 6 segments. Axis relatively narrow, tapering backward; it is devoid of spines on the third and fourth segments. Pleurae straight, with very distal fulcrum, and wide submeidan furrow parallel to margin. Pleural extremities bend backwards, ending as short spines. Pygidium semielliptical to subtrangular in outline, elongated transversely with almost unsegmented short axis and smooth lateral regions on which only articulating facet is perceptible. Border broad sloping steeply downward.