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Ianthinopsis medialis

Gastropoda - Murchisoniina - Soleniscidae

Taxonomy
Macrocheilus medialis was named by Meek and Worthen (1860). It is not a trace fossil.

It was recombined as Soleniscus (Macrocheilus) medialis by White (1884); it was recombined as Sphaerodoma medialis by Girty (1915); it was recombined as Soleniscus (Macrochilina) medialis by Knight (1931); it was recombined as Ianthinopsis medialis by Yochelson and Saunders (1967).

Synonymy list
YearName and author
1860Macrocheilus medialis Meek and Worthen p. 466
1884Soleniscus (Macrocheilus) medialis White p. 187 figs. pl. 8 f. 15-16
1915Sphaerodoma medialis Girty p. 199
1931Soleniscus (Macrochilina) medialis Knight p. 217–219 figs. pl. 25 f. 4a-c; pl. 27 f. 9
1967Ianthinopsis medialis Yochelson and Saunders pp. 101 – 102

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
RankNameAuthor
classGastropodaCuvier 1797
subclassOrthogastropoda
orderMurchisoniina
superfamilyLoxonematoidea(Koken 1889)
familySoleniscidae
genusIanthinopsis
speciesmedialis()

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 1931Of moderate size; sub-oval, with relatively long body whorl; sides of spire concave at neanic and markedly convex at ephebic stages; sutures but slightly impressed; suture of the final whorl of fully grown individuals more oblique than those of the younger whorls; inductura tremendously thickened just within the aperture of fully grown individuals and only to a less degree in younger ones; upper part of the thickened inductura of some specimens marked with faint, vertical grooves; siphonal folds distinct, bordered posteriorly by a rather narrow, deep groove in the inductura, the latter swelling out above the groove into the semblance of a low, rounded fold; siphonal channel wide and shallow; surface smooth, almost polished, growth lines faint; color in life seemingly uniform dark gray, almost black.