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Strettonia
Taxonomy
Strettonia was named by Cobbold (1931) [Sepkoski's age data: Cm Boto-l Cm lMid Sepkoski's reference number: 80,81,885]. It is not extant. Its type is Strettonia comleyensis.
It was assigned to Dorypygidae by Cobbold (1931) and Jell and Adrain (2002); and to Corynexochida by Sepkoski (2002).
It was assigned to Dorypygidae by Cobbold (1931) and Jell and Adrain (2002); and to Corynexochida by Sepkoski (2002).
Species
S. comleyensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1931 | Strettonia Cobbold |
| 2002 | Strettonia Jell and Adrain p. 448 |
| 2002 | Strettonia 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 | |
|---|---|---|
| E. S. Cobbold 1931 | Dorsal shield convex, with relatively strong axial lobe. Test granular, the granules tending towards linear arrangement. Cephalon elongate, semi-elliptical to semicircular. Cranidium trapezoidal, features in strong relief; axial lobe narrowing towards the occipital ring; glabella extending to the anterior border, with four pairs of side furrows, more or less obsolete anteriorly, and tending to sink into pits within, and independent of, the dorsal furrow; dorsal furrow clearly marked, sinking to a pit at a point in advance of the palpebral ridge independently of the glabellar furrows, coalescing with the anterior intra-marginal furrow; front border consisting of a narrow, convex, marginal rim limited by a sharply marked furrow; occipital ring well defined ; fixed cheeks sub-triangular, laterally steeply inclined; palpebral ridge short, not connected to the glabella; palpebral lobe rather long (one-third, more or less, of the length of the cranidium), depressed; facial suture, posterior branch a slightly sigmoidal curve extending outwards and downwards to the rounded lateral angles, anterior branch unknown. :Free cheek triangular with convex border and genal spine. Thorax unknown. Pygidium (?). In the pygidium associated with the genotype the anterior axial lobe is partially divided by a transverse groove, and the bases of the pleural spines are seen to originate from the anterior half, while the corresponding axial spine rises from the
posterior portion. |