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Suessionia canalifera
Taxonomy
Pseudoliva (Fusopsis) canalifera was named by Ravn (1939). Its type specimen is MGUH 3785, a shell, and it is a 3D body fossil.
It was recombined as Suessionia canalifera by Pacaud and Schnetler (1999).
It was recombined as Suessionia canalifera by Pacaud and Schnetler (1999).
Synonymy list
| Year | Name and author |
|---|---|
| 1939 | Pseudoliva (Fusopsis) canalifera Ravn p. 76 figs. pl. 3, figs 4a–b. |
| 1999 | Suessionia canalifera Pacaud and Schnetler pp. 63 - 64 figs. Pl. 4, Figs 4–5, Fig. 3A–B |
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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.
†Suessionia canalifera Ravn 1939
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J.-M. Pacaud and K. I. Schnetler 1999 | The shell is very small, slender and fusiform. The width almost equals the total shell height. The protoconch is multispiral, consisting of four smooth whorls, which are separated by rather distinct sutures. The nucleus is very small and orthostroph and the following three protoconch whorls are increasing regularly in diameter. The terminal protoconch whorl is rapidly increasing in height. The transition into the teleoconch is indicated by the appearance of a spiral ornamentation and three close-set radial riblets. The teleoconch consists of two convex whorls which are separated by deep and undulating sutures, caused by a small subsutural band. The last whorl comprises a little more than two thirds of the total shell height. The base is convex. The radial sculpture consists of 11 rather strong, almost orthocline ribs. The spiral ornamentation consists of 10 spiral narrowly spaced riblets. On the last whorl the space between the two adapical spiral bands is wider, and abapically the radial ribs gradually disappear. The base and the neck of the canal have about 20 very fine, close-set spiral riblets. The growth lines are relatively distinct. The aperture is ovale and equals half the total shell height. The columella is smooth and concave. The callus is thin. The canal is well developed but rather short, strongly bent backwards, truncated and slightly notched. The labrum is thin and orthocline. |