Diagnosis: Shell small to large size; moderately pyriform shape, constricted anteriorly; fossula smooth, concave, wide.
Diagnosis: Bernaya of medium size, anterior and posterior canals deep, spire of medium height, fossula concave, and smooth posterior terminal ridges extend to margins.
kiaeri are more closely related to the great number of North American species of Grewingkia provided with a pronounced cardinal fossula (thoroughly described by Elias in numerous papers, e.
A cardinal fossula is lacking, but a narrow pseudofossula may be present.
The genus Grewingkia Dybowski, 1873, on the contrary, mainly includes comparatively large, liberosessile species with strongly dilated septa throughout the early ontogeny, a cardinal fossula often provided with a septofossular stage (= short cardinal septum) in the calice, and a tabularium with several peripheral tabellae.
2H-L and 3), lacking a cardinal fossula or septofossula and only having slightly dilated septa, are here included in Eurogrewingkia.
The cardinal septum seems to be as long as the other major septa, and a cardinal fossula is lacking.
34-47), shows some similarities with Fosselasma unicum Neuman, 1975 but differs considerably in the following aspects: tabulae are usually depressed in the cardinal fossula (which must be interpreted as a fossula sensu stricto) and septa range from nondilated to completely dilated, which is observed in all ontogenetic stages (also confirmed by Elias, pers.
7-10), having a cardinal fossula sensu stricto visible throughout the ontogeny, differs considerably from Fosselasma gen.
As observed from the illustrations in He (1978), all these species are provided with a cardinal fossula sensu stricto and seem to have amplexoid septa.
Streptelasmatid genera with a cardinal fossula sensu stricto increased sparsely in the late Rawtheyan, e.