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Stephanozyga subnodosa

Gastropoda - Pseudozygopleuridae

Taxonomy
Pseudozygopleura (Stephanozyga) subnodosa was named by Knight (1930) [Pseudozygopleura (Stephanozyga) subnodosa Knight 1930]. Its type specimen is YPM 12990, a shell, and it is not a trace fossil. Its type locality is Locality 42. Steep embankment along Pershing Ave. at Cleveland Walk., which is in a Moscovian carbonate limestone in the Fort Scott Formation of Missouri.

It was recombined as Palaeostylus (Stephanozyga) subnodosa by Hoare (1961); it was recombined as Stephanozyga subnodosa by Wagner (2023).

Synonymy list
YearName and author
1930Pseudozygopleura (Stephanozyga) subnodosa Knight
1961Palaeostylus (Stephanozyga) subnodosa Hoare pp. 170-171 figs. pl. 21 f. 13-14
1967Pseudozygopleura (Stephanozyga) subnodosa Yochelson and Saunders p. 156
1984Pseudozygopleura (Stephanozyga) subnodosa Kues figs. f. 3.46
1990Pseudozygopleura (Stephanozyga) subnodosa Kues p. 256 figs. f. 3.29-3.34
1995Pseudozygopleura (Stephanozyga) subnodosa Batten p. 31 fig. 43
2001Pseudozygopleura (Stephanozyga) subnodosa Kues and Batten p. 73 figs. f. 14.5
2023Stephanozyga subnodosa Wagner p. S5835

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassCaenogastropoda(Cox 1959)
superfamilyZygopleuroidea
familyPseudozygopleuridae()
genusStephanozyga()
speciessubnodosa()

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.

†Stephanozyga subnodosa Knight 1930
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Diagnosis
ReferenceDiagnosis
R. L. Batten 1995Whorl profile convexo-concavo- convex. Area adjacent to suture convex with arcuate, widely spaced transverse lirae. Midwhorl region concave and ornamented by reinforced growth lines. Lower third of whorl strongly convex with well-developed transverse costae on periphery which are extensions of subsutural lirae. Costae become weak and disappear on flatly rounded base. Base has reinforced growth lines for ornamentation. Narrowly phaneromphalus.