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Spathacalymene

Trilobita - Phacopida - Calymenidae

Taxonomy
Spathacalymene was named by Tillman (1960) [Sepkoski's age data: S Ldov-u S Ludl-l]. It is not extant. Its type is Calymene nasuta.

It was assigned to Calymeninae by Tillman (1960); to Phacopida by Sepkoski (2002); and to Calymenidae by Jell and Adrain (2003).

Synonymy list
YearName and author
1960Spathacalymene Tillman
2002Spathacalymene Sepkoski, Jr.
2003Spathacalymene Jell and Adrain p. 446

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
RankNameAuthor
phylumArthropodaLatreille 1829
subphylumMandibulata
classTrilobitaWalch 1771
orderPhacopidaSalter 1864
familyCalymenidaeMilne-Edwards 1840
genusSpathacalymeneTillman 1960

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.

Diagnosis
ReferenceDiagnosis
C. G. Tillman 1960Papillate calymenid trilobite characterized by great but variable development of U-shaped or spatulate process from anterior border, very deep preglabellar furrow, large rostrum with open V-shaped an- terior edge and unknown posterior edge, distinct flattening of tops of axial and pleural thoracic lobes, twelve (?) or thirteen thoracic segments, pygidium with five axial rings and four pleural furrows, the latter extend- ing only two-thirds of way to ventral edge of pleurae, very faint interpleural furrows on inner parts of pleurae only