CRUCILOCULINA d'Orbigny, 1839

 

 

Type species: Cruciloculina triangularis d'Orbigny, 1839 (*2306), p. 72; SD(SM).

Cruciloculina d'Orbigny. 1839 (*2304), p. 182.

Test ovate in outline, subtriangular to distinctly triangular in section, chambers one-half coil in length, added 120° apart as in Triloculina; wall calcareous, imperforate, porcelaneous, surface smooth, striate to costate; aperture with a simple flap in the earli­est chambers, becoming more complex in later stages, and distinctly cruciform in the adult. Pliocene to Holocene: N. and S. Atlantic; Japan; Mediterannean.

 

Remarks: Although juvenile specimens of Cruciloculina may have an aperture like that of Triloculina, the adult tests are readily differentiated and both genera are recognized as valid.