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Phalium (Menthafontia) menthafons
Taxonomy
Phalium (Menthafontia) menthafons was named by MacNeil and Dockery (1984). Its type specimen is USNM 376469, a shell, and it is a 3D body fossil. Its type locality is MGS Loc. 99a - Cleary [Mint Spring Fm], which is in a Rupelian offshore conglomerate/wackestone in the Mint Spring Formation of Mississippi. It is the type species of Phalium (Menthafontia).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1984 | Phalium (Menthafontia) menthafons MacNeil and Dockery p. 112 figs. Plate 17, figures 10-13 |
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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.
†Phalium (Menthafontia) menthafons MacNeil and Dockery 1984
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. S. MacNeil and D. T. Dockery 1984 | Shell moderately large, moderately inflated, spire high for a cassid and stout, whorls rounded, sutures appressed with a high collar but well below the shoulder, subsutural slope strongly concave, shoulder with strong pointed nodes, aper ture elongate, outer lip thick and flaring, thin varices at irregular intervals, inner lip detached, umbilical chink large, columella strongly twisted and of moderate length; protoconch large, bulbous and slightly tilted, consisting of about 3-1/2 smooth, round, inflated whorls; juvenile whorls with moder ately fine spiral sculpture which on the shoulder con sists of primary, secondary, and tertiary raised threads, but which below the shoulder consists of spiral bands which are high on the posterior side and submerged on the anterior side, some bands having a raised thread in the center; adult whorls nearly smooth, only faint and irregular vestiges of the spiral bands remaining; all postnuclear whorls with strong blunt rounded nodes on the shoulder, the body whorl showing a very weak staggered row below the shoulder; parietal wall with weak irregular teeth, teeth becoming larger and stronger on the columellar callus; outer lip with about 11 short teeth; umbilical chink deep; columella twisted and sharply inclined to form a strong raised siphonal fasciole. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||