Foraminifera source details
Barker, R. W.; Grimsdale, T. F. (1936). A contribution to the phylogeny of the orbitoidal foraminifera, with descriptions of new forms from the Eocene of Mexico. Journal of Paleontology. 10: 231-247.
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Barker, R. W.; Grimsdale, T. F.
1936
A contribution to the phylogeny of the orbitoidal foraminifera, with descriptions of new forms from the Eocene of Mexico
Journal of Paleontology
10: 231-247
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Two new genera and seven new species and varieties are described from the Eocene of Mexico. Polylepidina and Helicolepidina are shown to be descended from Amphistegina, through the new genera Helicostegina and Eulinderina, by a complete series of transitional forms. The general relationships of the group are briefly discussed, and the possible polyphyletic origin of Lepidocyclina adumbrated.
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Eulinderina Barker & Grimsdale, 1936 † (original description)
Eulinderina guayabalensis var. regularis Barker & Grimsdale, 1936 † accepted as Eulinderina regularis Barker & Grimsdale, 1936 † (original description)
Eulinderina semiradiata Barker & Grimsdale, 1936 † accepted as Eolepidina semiradiata (Barker & Grimsdale, 1936) † accepted as Eolepidina antillea (Cushman, 1919) † (original description)
Helicolepidina paucispira Barker & Grimsdale, 1936 † (original description)
Helicostegina Barker & Grimsdale, 1936 † (original description)
Helicostegina dimorpha Barker & Grimsdale, 1936 † (original description)
Helicostegina gyralis Barker & Grimsdale, 1936 † (original description)
Polylepidina chiapasensis var. subplana Barker & Grimsdale, 1936 † accepted as Eolepidina subplana (Barker & Grimsdale, 1936) † (original description)
Polylepidina discoidalis Barker & Grimsdale, 1936 † (original description)
Eulinderina guayabalensis var. regularis Barker & Grimsdale, 1936 † accepted as Eulinderina regularis Barker & Grimsdale, 1936 † (original description)
Eulinderina semiradiata Barker & Grimsdale, 1936 † accepted as Eolepidina semiradiata (Barker & Grimsdale, 1936) † accepted as Eolepidina antillea (Cushman, 1919) † (original description)
Helicolepidina paucispira Barker & Grimsdale, 1936 † (original description)
Helicostegina Barker & Grimsdale, 1936 † (original description)
Helicostegina dimorpha Barker & Grimsdale, 1936 † (original description)
Helicostegina gyralis Barker & Grimsdale, 1936 † (original description)
Polylepidina chiapasensis var. subplana Barker & Grimsdale, 1936 † accepted as Eolepidina subplana (Barker & Grimsdale, 1936) † (original description)
Polylepidina discoidalis Barker & Grimsdale, 1936 † (original description)