GEOLOGICAL SURVEY OF IRAN | WWW.GSI.IR
 
فارسی  |     
Home |  Contact Us |  Help 
    Member Login
Username
Password
Home Latest Update :  3 Tuesday April 2012
Other Genus
OrderFORAMINIFERIDA
Sub OrderROTALIINA
Super FamilyDISCORBACEA
FamilyHELENINIDAE
Genus PSEUDOHELENINA


PSEUDOHELENINA Collins, 1974
 

Type species: Discorbis collinsi Parr, 1932 (*2356), p. 230; OD.
Pseudohelenina Collins. 1974(*647), p. 37.Test trochospiral, biconvex, all of the two to three whorls visible on the more convex spiral side, chambers enlarging gradually, sutures depressed, oblique and curved back at the periphery, only the six chambers of the final whorl visible and sutures radial and depressed around the deeply indented umbilicus on the flatter umbilical side, the deeply incised sutures giving the appearance of sutural slits around the umbilicus, periphery broadly rounded. peripheral margin lobulate; wall calcareous, hyaline, optically radial, moder­ately coarsely perforate except for a small clear area on the distal face of the final chamber. surface smooth; primary aperture interiomarginal, umbilical, bordered with a small projecting flap, secondary sutural apertures on the spiral side, subtriangular in outline and extend along the spiral and septa[ sutures for a short distance, those of early chambers closed secondarily. Pleistocene to Holocene; Australia: Victoria.
Alphabet Word
Genus(Selected):
Genus(Input Text):
 About Paleontology
 Paleontology Details
Other Sub Order 
Other Super Family 
Other Family 
Other Sub Family 
Related links

External links