Original Description Test with the early chambers arranged in a biserial manner similar to Guembelina, later chambers uniserial and rounded in transverse section; chambers all inflated, distinct; sutures distinct, depressed; wall calcareous, thin, very finely perforate; aperture in the early stages similar to Guembelina, in the adult terminal, rounded, with a distinct neck. Extra details from original publication Introductory text: In the Heterohelicidae there are numerous developments which evidently came from Guembelina, such as Pseudotextularia, Planoglobulina, Ventilabrella, etc. These have come about by the addition of more complex types of development. It is, therefore, interesting to note the following genus which is in its gen eral characters a parallelism with Bigenerina in the Textulariidae. Our species, however, are developed directly from Guembelina as the early stages show, and the wall is calcareous and finely perforate. It is to be looked for, from the two records given here, in the various portions of the Upper Cretaceous of Texas and adjacent regions. Editors' Notes Cushman 1932 described two species in this genus - R. cretacea and R. texana, and several further species have been described. However most of these are now interpreted as benthic forminifera and placed in the genera Bifarina or Tubitextularia (see Olsson et al. 1999 p93-94) - so they are not cataloged here.
Cushman, J. A. (1932). Rectoguembelina, a new genus from the Cretaceous. Contributions from the Cushman Laboratory for Foraminiferal Research. 8(1): 4-7. gs
Rectoguembelina compiled by the pforams@mikrotax project teamviewed: 1-6-2023