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Glabrocingulum (Glabrocingulum) stankovskyi

Gastropoda - Murchisoniina - Gosseletinidae

Taxonomy
Glabrocingulum (Glabrocingulum) stankovskyi was named by Mazaev (2006) [= Tretospira sp. Nel’zina, 1978 (in Kalmykova et al., 1978), pl. 1, fig. 25.]. Its type specimen is PIN 4919/2-114, a shell, and it is not a trace fossil. Its type locality is Kholm Village 4919/2, Pinega River, which is in a Sakmarian carbonate grainstone in the Kulogory Formation of the Russian Federation.

Synonymy list
YearName and author
2006Glabrocingulum (Glabrocingulum) stankovskyi Mazaev p. 397 figs. pl. 5 f. 1-2

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classGastropodaCuvier 1797
subclassOrthogastropoda
RankNameAuthor
orderMurchisoniina
superfamilyEotomarioidea
familyGosseletinidae
subfamilyGosseletininae
subtribeGlabrocingulides
genusGlabrocingulum
subgenusGlabrocingulum
speciesstankovskyi

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
A. V. Mazaev 2006The shell is trochiform, medium-sized, with height approximately one-quarter of the maximum diameter, and consisting of six or seven shoulder whorls. The protoconch is very small and indistinguishable in the specimens studied. The subsutural ramp of the last whorl is approximately half as much as the width of the lateral surface and inclined to the horizontal line at an angle of 45˚ –50˚. The shoulder is well pronounced, almost sharp, and marked by a narrow selenizone that is bordered by two thin prominent spiral ribs. The selenizone is concave. The line that connects the apices of the ribs bordering the selenizone is inclined to the shell axis at an angle of 40˚. The suture is canal-like, well pronounced, thin, shallow, and located slightly below or above the lower rib of the selenizone. On the first whorls, the profile of the subsutural ramp is straight or slightly convex. The subsutural fold is prominent and located on the last two or three whorls. Its width is about one-third of the subsutural ramp. The surface between the fold and the selenizone is evenly concave. The subsutural fold is covered with numerous spiral threads and tubercles that are presumably placed on the last two whorls. The surface between the sutural fold and the selenizone bears no less than six thin, sharp, and spiral ribs with equal interspaces. The width of the spiral threads is approximately twice as narrow as the spiral ribs bordering the selenizone. The lateral surface is slightly convex, almost vertical, and separated from the basal surface by rounded angulation. The basal surface is slightly convex. Both lateral and basal surfaces are ornamented with large spiral ribs. These ribs and interspaces are also ornamented with numerous hardly distinguishable spiral threads. The number of large ribs in the lateral surface varies from four to seven. The ribs are thin near the selenizone and widen and flatten downwards; the width of the interspaces changes with rib thickness. The basal surface bears approximately seven large ribs (better pronounced than on the lateral surface). Their width increases insignificantly downwards. The outer lip is not preserved, the basal and inner lips are massive, the inner lip is very short, flared to form the umbonal callus that completely closes the umbonal part of the shell. The growth lines are thin, thread-like; in the basal surface of the shell, some of them are more prominent and canal-like. The growth lines in the subsutural ramp are slightly curved anteriorly and directed from the suture backwards to the selenizone. The growth lines located below the selenizone are smoothly curved anteriorly.