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:
Family
Amphisteginidae Cushman, 1927
|
Thin section photomicrograph of Gypsina sp., fragment of Eulepidina sp., Amphistegina sp. |
Family Boreloididae
Reiss, 1963
Family
Lepidocyclinidae Scheffen, 1932
Subfamily
Helicolepidininae Tan, 1936
|
Eulinderina sp., Middle
Eocene, Yecuatla, Veracruz, Mexico, equatorial secion |
|
Axial section |
|
Helicolepidina spiralis (Tobler), Eocene, El Alto, NW Peru,
equatorial section,
microspheric form |
|
Helicostegina
gyralis Barker and
Grimsdale, Middle Eocene, |
|
Polylepidina
sp., latest Middle |
Subfamily
Lepidocyclininae Scheffen, 1932
|
Eulepidina ephippioides (Jones and Chapman), Oligocene, Kirkuk
Well no.19, |
|
Lepidocyclina sp., Miocene (Serravallian,
Tf2), |
|
Lepidocyclina
murrayana Jones and
Chapman, Early Miocene, Dutch New Guinea |
|
L. (Nephrolepidina)
ferreroi Provale, Miocene (Burdigalian),
sample 3813 from mollusc shell Limestone at Loa Duri (W. Outcrop) 100m from
River East Kalimantan, |
|
Pseudolepidina trimera Barker and Grimsdale, base of Middle
Eocene, Vera Cruz, |