ASTERIGERINOIDEA

 

Test: trochospiral to planispiral, with a closed umbilicus. Chambers occur with internal partitions. Supplementary chamberlets develop around the umbilicus.The aperture is umbilical, and may extend up the apertural face. Late Cretaceous (Santonian) to Holocene.

 

There are three main families:

·         Amphisteginidae

·         Boreloididae

·         Lepidocyclinidae

 

 

Family Amphisteginidae Cushman, 1927

 

  • Amphistegina d’Orbigny, 1826. Eocene to Holocene.

 

 

 

 

Thin section photomicrograph of Gypsina sp., fragment of Eulepidina sp., Amphistegina sp.

 

Family Boreloididae Reiss, 1963

 

  • Boreloides Cole and Bermudez, 1947. Middle to Late Eocene.
  • Eoconuloides Cole, 1944. Late Paleocene to Eocene.

 

Family Lepidocyclinidae Scheffen, 1932

 

Subfamily Helicolepidininae Tan, 1936

 

  • Eulinderina Barker and Grimsdale, 1936. Middle Eocene.

 

 

 

 

 

 

 

 

 

 

 

Eulinderina sp., Middle Eocene, Yecuatla, Veracruz, Mexico, equatorial secion

 

Axial section

 

  • Helicolepidina Tobler, 1922. Middle to Late Eocene.

 

 

 

 

 

Helicolepidina spiralis (Tobler), Eocene, El Alto, NW Peru, equatorial section, microspheric form

 

  • Helicostegina Barker and Grimsdale, 1936. Middle to Late Eocene.

 

 

 

 

 

Helicostegina gyralis Barker and Grimsdale, Middle Eocene, Yecuatla, Veracruz, Mexico, equatorial sections

 

  • Helicosteginopsis Caudri, 1975. Late Eocene.
  • Polylepidina Vaughan, 1924. Late Middle Eocene.

 

 

 

Polylepidina sp., latest Middle Eocene, Jamaica

 

 

Subfamily Lepidocyclininae Scheffen, 1932

 

  • Asterolepidina Loeblich and Tappan, 1988. Oligocene.
  • Eulepidina Douvillé, 1911. Late Early Oligocene to Miocene (middle Burdiaglian).

 

 

 

 

 

Eulepidina ephippioides (Jones and Chapman), Oligocene, Kirkuk Well no.19, Iraq

 

  • Lepidocyclina sp. sensu lato Gümbel, 1870 emend. BouDagher-Fadel and Banner, 1997. ?Early Oligocene/ Late Oligocene  to Middle Miocene (Serravallian).

 

 

 

 

 

Lepidocyclina sp., Miocene (Serravallian, Tf2), Darai Limestone, Papua New Guinea

 

  • Lepidocyclina (Lepidocyclina) Gümbel, 1870 as emended by BouDagher-Fadel and Banner, 1997. Middle Eocene (Lutetian) to Early Miocene.

 

 

 

 

Lepidocyclina murrayana Jones and Chapman, Early Miocene, Dutch New Guinea

 

  • Lepidocyclina (Nephrolepidina) Douvillé, 1911. Late Oligocene to Middle Miocene (Serravallian).

 

 

 

 

 

L. (Nephrolepidina) ferreroi Provale, Miocene (Burdigalian), sample 3813 from mollusc shell Limestone at Loa Duri (W. Outcrop) 100m from River East Kalimantan, Borneo,

 

  • Pseudolepidina Barker and Grimsdale, 1937. Middle Eocene.

 

 

 

 

 

 

Pseudolepidina trimera Barker and Grimsdale, base of Middle Eocene, Vera Cruz, Mexico, cotype

 

  • Multilepidina Hanzawa, 1932. Miocene (late Burdigalian to Serravallian).