|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Atrypida - Atrypinidae
It was recombined as Sulcatospira asiatica by Popov et al. (1999).
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.
|L.E. Popov et al. 1999||Sulcatospira with slightly dorsibiconvex shell; outline rounded pentagonal, about 91 per cent. as long as wide and 64 per cent. as thick as long; anterior commissure uniplicate; ventral valve moderately convex with posteriorly directed, slightly curved beak and open delthyrium; sulcus originates at the umbonal area, sharpened laterally by strong, angular costae and deepened anterior to mid-length; tongue trapezoidal, strongly inclined to commissural plane and about 64 per cent. as wide as maximum shell width; dorsal valve moderately convex with shallow sulcus in the umbonal area, reversed as a high median fold with steep slopes anterior to mid-valve; radial ornament costate with up to ten ribs on flanks; costellate in the fold and sulcus with one primary rib in fold, two ribs in sulcus, and normally one or two secondary ribs bifurcating anterior to mid-length; accentuated median rib usually present in the ventral valve; crura subparallel, anteriorly directed; jugal process long, strongly thickened near the junction with spiralial base; spiralia with up to seven whorls.|