PALORBITOLINOIDES Cherchi and Schroeder, 1980

 

 

Type species: Palorbitolinoides hedini Cherchi and Schroeder, 1980; OD.

Palorbitolinoides Cherchi and Schroeder, 1980 (*567), p. 385.

Test discoidal to convexoconcave, very thin, only about 1 mm thick, megalospheric individuals 8 mm to 10 mm in diameter and one microspheric individual more than 23 mm in diameter, megalospheric embryo with a large central chamber having many short exoskeletal beams of two orders on the upper surface that result in an alveolar layer, central chamber also surrounded laterally and below by a periembryonic zone with numerous beams near the upper surface forming an alveolar layer at the sides of the central chamber, and a layer of relatively large and undivided irreg­ular chambers below the proloculus; postembryonal chambers subdivided into a marginal zone with alveolar structure produced by the vertical radial beams, a radial zone with well-developed beams of triangular section that alternate in position from one chamber to the next, and a central zone in which the beams probably anastomose, although detailed struc­ture is obscured by the coarse agglutinated material; apertural pores lead obliquely from one chamber to the next. L. Cretaceous (U. Aptian to ?Albian); India; Afghanistan; Tibet.