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Parkaspis
Taxonomy
Parkaspis was named by Rasetti (1951) [Sepkoski's age data: Cm mMid-u Sepkoski's reference number: 81,1089]. It is not extant.
It was assigned to Zacanthoididae by Sundberg (1994) and Jell and Adrain (2002); and to Corynexochida by Sepkoski (2002).
It was assigned to Zacanthoididae by Sundberg (1994) and Jell and Adrain (2002); and to Corynexochida by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1951 | Parkaspis Rasetti |
| 1994 | Parkaspis Sundberg p. 43 |
| 2002 | Parkaspis Jell and Adrain p. 422 |
| 2002 | Parkaspis Sepkoski |
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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
| Reference | Diagnosis | |
|---|---|---|
| F. A. Sundberg 1994 | Zacanthoididae with cranidia with expanding glabella, preglabellar field absent, anterior border present, long, narrow, mod- erately curved palpebral lobes terminating opposite preoccipital lobe, facial sutures widely divergent anterior of palpebral lobes. Thoracic axial lobe not as wide (trans.) as pleural lobes exclusive of spines. Small,transverselyelongatepygidiumwithaxiallobe 40% or greater of pygidial width, pleural furrows moderate depth, border furrow indistinct, 4-6 pairs of posteriorly directed, rounded spines on posterior margin. |