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Vladanella lirata
Taxonomy
Mourlonia lirata was named by Tyler (1965). Its type specimen is UMMP 47376, a shell, and it is a 3D body fossil. Its type locality is river bed immediately downstream from the Four Mile Dam on Thunder Bay River, which is in a Givetian carbonate limestone in the Four Mile Dam Formation of Michigan.
It was recombined as Vladanella lirata by Wagner (2023).
It was recombined as Vladanella lirata by Wagner (2023).
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.
†Vladanella lirata Tyler 1965
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. H. Tyler 1965 | Shell large, highest paratype 41.5 mm. high with apical whorls missing and 52 mm. wide; turbiniform; adult whorl profile sloping steeply for about three-fourths its length, becoming nearly vertical before continuing down to lira bordering concave selenizone; sutures deeply incised in apical spire, less so between later whorls; base of mature whorl narrowly phaneromphalus, gently convex; growth lines above selenizone prosocline, relatively strong, intercepting numerous, fine spiral threads, producing dictyate pattern; growth lines below selenizone weakly prosocline, finer and more closely spaced than above selenizone; selenizone of apical whorls slightly raised, bordered by distinct threads; on more mature whorls selenizone less sharply elevated or on some specimens slightly depressed; regularly spaced, crescentic lunulae present in selenizone of more mature whorls; sinus shallow; slit obscured in all available specimens; spiral threads coarser and more widely spaced above selenizone than below; ornamentation of most mature whorl of holotype showing gerontism in collabral and spiral threads becoming variably thickened and irregularly spaced, producing crudely wrinkled, dictyate pattern. |
Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| References: Bambach et al. 2007, Hendy 2009 | |||||