CHUBBINA Robinson, 1968

 

 

Type species: Chubbina jamaicensis Robinson, 1968; OD.Chubbina Robinson, 1968 (*2633), p. 527.

Test large, up to 8 mm in diameter and about 1.5 mm in thickness, globular or lenticular in early stage, later flaring and peneropline, spherical megalospheric proloculus followed by single undivided tubular chamber, micro-spheric early stage milioline, later with numer­ous whorls, at first streptospiral, later planispiral with the number of chambers per whorl increas­ing to about fifteen, chambers increase rap-idly in height as added so that the adult test is uncoiled and flabelliform, interior subdivided by numerous primary and secondary axially aligned septula, central thickening and numer­ous residual pillars present in the preseptal space as in Rhapydionina: wall calcareous, porcelaneous; aperture multiple, with open­ings scattered uniformly over the apertural face of the final chamber, previous foramina connecting successive chamberlets. U. Cretaceous (Campanian to Maastrichtian); Ja­maica; Mexico; Cuba; USA: Florida.

 

Remarks: As the type species was described on the basis of cotypes, without selection of a holotype, the specimen (BMNH no. P-48049) figured by Robinson (1968, pl. 101, fig. 1) is here designated as lectotype.