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Baylea knighti
Taxonomy
Yvania knighti was named by Weller (1929). It is not a trace fossil.
It was recombined as Baylea knighti by Batten (1995).
It was recombined as Baylea knighti by Batten (1995).
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.
†Baylea knighti Weller 1929
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Batten 1995 | Relatively low-spired shells with whorls embracing at, or just below, lower alveozone margin. Early whorls smooth, evenly developed. Upper whorl surface slightly concave and almost at a right angle to axis. Well-developed spiral cord adjacent to sharply defined suture. There may be one or two fine spiral lirae between this cord and suture and from one to four lirae between cord and upper selenizone margin. Selenizone margins are sharply formed spiral cords. Alveozone is wide and nearly vertical so that, with the flattened base and nearly horizontal upper whorl surface, the whorl profile is rectilinear. Lower alveozone margin is equal in development to lower selenizone margin. Prominent spiral cord 1/3 distance above lower margin and a less well-developed spiral cord halfway between that cord and lower selenizone margin, so that alveozone is divided into three sections. Between these sections finer spiral lirae may develop. Base is flatly rounded with from 7 to 14 spiral cords or lirae. Minutely phaneromphalus. Columellar lip is reflexed and thickened into a narrow callus. No parietal alteration and no collabral ornament. |