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Baylea yvanii

Gastropoda - Pleurotomariida - Phymatopleuridae

Taxonomy
Trochus yvanii was named by Léveillé (1835). It is a 3D body fossil.

It was recombined as Pleurotomaria yvanii by de Koninck (1844); it was recombined as Yvania yvanii by Fischer (1885); it was recombined as Pleurotomaria yvanni by Lamplugh et al. (1905); it was recombined as Baylea yvanii by de Koninck (1883), Knight (1941), Kase (1988) and Wagner (2017).

Synonymy list
YearName and author
1835Trochus yvanii Léveillé
1844Pleurotomaria yvanii de Koninck pp. 390 - 391 figs. pl. 37 f. 1a-c, f. 7a-c
1883Baylea yvanii de Koninck
1885Yvania yvanii Fischer p. 851
1905Pleurotomaria yvanni Lamplugh et al. p. 31
1941Baylea yvanii Knight pp. 51 - 52 figs. Plate 21, figures 1a-c
1988Baylea yvanii Kase pp. 364 - 366 figs. f. 3.1, 3.6-3.9
2017Baylea yvanii Wagner p. 4523

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classGastropodaCuvier 1797
RankNameAuthor
subclassOrthogastropoda
superorderVetigastropodaSalvini-Plawen 1980
orderPleurotomariida()
superfamilyPleurotomarioidea(Swainson 1840)
familyPhymatopleuridae
genusBaylea
speciesyvanii()

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
ReferenceDiagnosis
J. B. Knight 1941Thin-shelled, trochiform gastropods o f moderately large size and turretted spire with a shallow slit or notch giving rise to a selenizone just above the periphery; whorl profile at first sloping rather flatly from the upper suture with an angle of about 55 degrees from the vertical, then turning sharply downward a little less than vertically to the lower suture, the turn forming a sharp, carinate angulation, on the final whorl below the line o f suture rounding rather sharply onto the base; base rather flatly rounded, narrowly phaneromphalous; sutures nearly rectangular but shallow; columellar lip thin, sharp, swinging from the parietal wall first gently toward the umbilicus and then rounding rather sharply outward; parietal wall seemingly without an inductura; outer lip with an angular sinus culminating just above the angulation of the whorl in a very shallow slit which generates a selenizone bordered by two strong carinae, the selenizone concave and sloping outward at an angle of about 45 degrees, its outer carina being that of the angulation itself, the but rounding forward very quickly thus forming a small, rounded sinus close to the suture, the forward obliquity quickly rounding backward again and the margin o f the lip approaching the selenizone with strong backward obliquity, below the selenizone proceeding downward across the lower whorl face with moderately strong forward obliquity but rounding to a backward obliquity just before the base is reached, crossing the outer half of the base with strong backward obliquity but rounding forward again before the umbilicus is reached thus forming a broad, shallow sinus on the base; nucleus not well known but seemingly without the sharp angulation of the later whorls which arises gradually, the early neanic whorls with a flat selenizone well up on the whorl face; ornamentation other than the selenizone with its bordering carinae a series of revolving lirae or costae, those above the selenizone rather fine and from five to seven in number, those on the outer whorl face from three to six in number coarser and more widely spaced but with occasional finer intercalculated lirae, several finer lirae occupying a broad space just beneath the angulation, on the base about seven coarse revolving costae with numerous finer ones within the umbilical slope; lunulae on the selenizone very fine. A specimen before me of the usual size measures 32 mm. in height and 31 mm. in width, with a pleural angle of 74 degrees.