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Libertella
Taxonomy
Libertella was named by Hu (1971) [Sepkoski's age data: O Cara-l Sepkoski's reference number: 694]. Its type is Libertella corona.
It was assigned to Encrinuridae by Hu (1971); to Staurocephalidae by Evitt and Tripp (1977); and to Phacopida by Sepkoski (2002).
It was assigned to Encrinuridae by Hu (1971); to Staurocephalidae by Evitt and Tripp (1977); and to Phacopida by Sepkoski (2002).
Species
L. corona (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1971 | Libertella Hu pp. 109 - 110 |
| 1977 | Libertella Evitt and Tripp p. 158 |
| 2002 | Libertella 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 | |
|---|---|---|
| C. Hu 1971 | Cranidium subtriangular to subtrapezoidal in outline, convex, having a pair of long fixigenal spines. Glabella strongly expanded forward without glabellar furrows. Fixigenae quadrate, broad posteriorly, occupied by a pair of small palpebral lobes. Librigenae narrow with steeply sloping ocular platform. Hypostoma diamond-shaped with a slightly convex median body. Thorax divided into at least eight segments; axis convex, elevated above pleural lobe, and bearing median spines. Pygidium subtriangular with five pairs of small marginal spines directed horizontally and three pairs vertically. Surface covered by large granules and spines. |