Foraminifera source details
Hayward, B. W. 1978: Foraminifera of the genera Cycloloculina Heron-Allen and Earland 1908, and Sherbornina Chapman 1922. Journal of Foraminiferal Research 8(3): 225-240.
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Hayward, B. W.
1978
Foraminifera of the genera Cycloloculina Heron-Allen and Earland 1908, and Sherbornina Chapman 1922
Journal of Foraminiferal Research
8(3): 225-240
Publication
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Study of the type species of Cycloloculina and Sherbornina
shows that these two genera can be distinguished
by the presence of a tubular canal system in
the latter and by its absence from the former. Examination
of types and other specimens of the 13 species
previously referred to these two genera indicates that
they can be reduced to two species of Cycloloculina
and five species of Sherbornina. These are shallow,
warm-water foraminifera having a world-wide distribution
and stratigraphic record from upper Paleocene
to mid-Miocene. There is an evolutionary trend from
simple to complex forms.
Populations exhibit considerable morphotypic variation,
with some individuals developing into Plunorbulinella-
like forms, which are thought to be schizogonous
resting stages in the life cycle.
Date
action
by
Cycloloculina Heron-Allen & Earland, 1908 † (additional source)
Cycloloculina annulata Heron-Allen & Earland, 1908 † accepted as Cycloloculina eocaenica (Terquem, 1882) † (basis of record)
Sherbornina Chapman, 1922 † (additional source)
Sherbornina atkinsoni Chapman, 1922 † (basis of record)
Sherbornina costellata (Terquem, 1882) † (new combination reference)
Cycloloculina annulata Heron-Allen & Earland, 1908 † accepted as Cycloloculina eocaenica (Terquem, 1882) † (basis of record)
Sherbornina Chapman, 1922 † (additional source)
Sherbornina atkinsoni Chapman, 1922 † (basis of record)
Sherbornina costellata (Terquem, 1882) † (new combination reference)