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Pleuropterygii (disused)
Taxonomy
Pleuropterygii is an order.
It was corrected as Pleuropterygia by Hay (1902).
It was assigned to Elasmobranchii by Dean (1894); to Ichthyotomi by Hay (1902); and to Selachii by Jordan (1963).
It was corrected as Pleuropterygia by Hay (1902).
It was assigned to Elasmobranchii by Dean (1894); to Ichthyotomi by Hay (1902); and to Selachii by Jordan (1963).
Synonymy list
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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.
Or. †Pleuropterygii
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. Dean 1894 | Notochord unconstricted; endoslieltal cartilages permeated with minute granular calcifications ; (membrane bones some- times occurring as in the specialized (Acanthodian) sub-order}. Tail broadly heterocercal, lacking hypural supports in upper lobe ; paired fins appearing as remnants of the primitive lateral fold, and functioning probably as balancers, directed somewhat downward ; the line of basalia imbedded in the body-wall, its caudad end not protruding; radialia, with little trace of jointed structure, extending from body-wall to fin tip, tending to concentrate and fuse in the anterior fin margin.l Claspers absent. A circum-orbital ring of derm plates. Evidence of loose integumentary gill flaps. Myocommata often preserved in fossils. |