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Porkunioceras tuba

Cephalopoda - Oncocerida - Graciloceratidae

Taxonomy
Porkunioceras tuba was named by Kröger (2007). Its type specimen is TUG 1227/24.. Its type locality is Porkuni, Siuge Member, which is in a Porkuni perireef or subreef lime mudstone/chert in the Ärina Formation of Estonia. It is the type species of Porkunioceras.

Synonymy list
YearName and author
2007Porkunioceras tuba Kröger p. 603 figs. 6B, 7F.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
RankNameAuthor
phylumMollusca
classCephalopodaCuvier 1797
orderOncocerida()
familyGraciloceratidaeFlower in Flower and Kummel 1950
genusPorkunioceras
speciestuba

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
B. Kröger 2007Porkunioceras differs from other Graciloceratidae in having nearly straight breviconic conch with angle of expansion of approximately 10 –30 that is ornamented with transverse raised lirae. Seven transverse lirae occur at one millimetre. Genus in consideration differs from Pomerantsoceras in having stumpy, ornamented shell. Cross section is compressed with ratio conch width/height 0.7. Septal spacing is narrow with approximately 0.2–0.25 of shell diameter. Septal curvature is very shallow. Sutures have shallow lateral lobe. Septal necks are achoanitic. Siphuncle is marginal, positioned at convex side of conch curvature and very thin, tubular with cross section 0.10 of conch. Apex is acute. Second septum of apex occurs at cross section diameter of approximately two millimetres. No endosiphuncular deposits known. Adult length of the conch amounts to approximately 15 mm.