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Stegocoelia quinquecostata

Gastropoda - Goniasmatidae

Taxonomy
Solenospira quinquecostata was named by Yin (1932). It is a 3D body fossil. Its type locality is Locality 510. Mokou, Fuihsien (Fi-l-Hsien), which is in a Gzhelian/Asselian carbonate limestone in the Houkou Formation of China.

It was recombined as Murchisonia (Stegocoelia) quinquecostata by Reed (1944); it was recombined as Stegocoelia quinquecostata by Mazaev (2019) and Wagner (2023).

Synonymy list
YearName and author
1932Solenospira quinquecostata Yin p. 17 figs. Pl 2, figs 7-13
1944Murchisonia (Stegocoelia) quinquecostata Reed p. 334 figs. Pl 58, fig 3
2019Stegocoelia quinquecostata Mazaev pp. 1306 - 1308 fig. 54b–54d
2023Stegocoelia quinquecostata Wagner p. S7692

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassCaenogastropoda(Cox 1959)
superfamilyOrthonematoideaNützel and Bandel 2000
familyGoniasmatidae()
genusStegocoelia()
speciesquinquecostata(Yin 1932)

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.

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Diagnosis
ReferenceDiagnosis
A. V. Mazaev 2019The shell is medium-sized, turreted, of at least 10 rounded whorls; the suture is distinct, impressed. The morphology of the protoconch and primary whorls is unknown. The lateral surface of the adult whorls is evenly rounded, carries four massive cordlike ribs separated by equal interspaces. The width of the ramp between the suture and upper rib is equal to or slightly less than the width of the interspaces. Each subsequent whorl adjoins under the fourth rib, very rarely overlaps it. The fourth rib marks a smooth transition of the lateral surface to the basal. The profile of the lateral and basal surfaces forms a smooth arc with almost the same radius. The morphology of the aperture is unknown. The growth lines are thin to coarse, over selenizone are inclined prosoclinally, on the selenizone they form lunulae, under selenizone they are smoothly prosocyrt, generally weakly inclined opisthoclinally.