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Spencella
Taxonomy
Spencella was named by Rasetti (1963) [Sepkoski's age data: Cm mMid-u Cm uMid-l Sepkoski's reference number: 81]. It is not extant.
It was assigned to Ptychopariina by Sundberg (1994); to Ptychopariidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
It was assigned to Ptychopariina by Sundberg (1994); to Ptychopariidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1963 | Spencella Rasetti |
| 1994 | Spencella Sundberg p. 111 |
| 2002 | Spencella Jell and Adrain p. 447 |
| 2002 | Spencella 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.
G. †Spencella Rasetti 1963
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†Spencella buttsi Resser 1938
†Spencella utahensa Sundberg 1994
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. A. Sundberg 1994 | Small, micropygous Ptychopariida with subrectangular cranidium with glabella ele- vated well above fixigena; slightly convergent, mod- erate depth axial furrows; shallow to effaced lateral glabellar furrows; bluntly rounded from lateral lobe; downsloping, moderately narrow to fixigenae; nar- row or absent preglabellar field; convex, moder- ately curved, sagittally narrow, strongly tapering, medially swollen anterior border; short length pal- pebral lobes; short (trans.) posterior area of fixigenae. Librigenae narrow, rounded at genal angle. Pygidium small, alate, elevated axis, 1-2 shallow pleural furrow pairs, poorly defined border. |