Test planispirally enrolled and involute, biumbilicate, early chambers globular and inflated, later ones radially elongate, and final one or two chambers clavate, sutures distinct, depressed; wall calcareous, moderately coarsely perforate, radial, surface pitted; aperture equatorial, an interiomarginal arch bordered with a distinct lip, lateral extremities of the aperture commonly remaining open as relict supplementary apertures around the umbilicus as new chambers are added.
Test planispirally enrolled, biumbilicate, involute to evolute, lobulate in outline, chambers globular to somewhat elongate in partially evolute species, sutures depressed; wall calcareous, perforate, optically radial; aperture equatorial and interiomarginal, bordered by a narrow imperforate lip, broad and low to moderately arched, the lateral portions remaining open as relict supplementary apertures around the umbilicus when new chambers are added.
Globigerinelloides gyroidinaeformis
Globigerinelloides algerianus
Globigerinelloides aptiensis
Globigerinelloides barri
Globigerinelloides ferreolensis
Globigerinelloides blowi
Globigerinelloides duboisi
Globigerinelloides maridalensis
Globigerinelloides paragottisi
Globigerinelloides elongatus
Globigerinelloides lobatus
Globigerinelloides sigali
Globigerinelloides sp.
Test planispirally enrolled and involute, biumbilicate, early chambers globular and inflated, later ones radially elongate, and those of the final whorl long and tapering, resembling tubulospines; wall calcareous, finely perforate; aperture a low interiomarginal equatorial arch bordered by a distinct lip, lateral part of the aperture remaining open as relict supplementary apertures around the umbilicus on each side as new chambers are added.
Planispiral, wall texture smooth except sometimes pustulose early chambers, weakly lobate with 6-9 chambers in final whorl.
Test planispiral throughout, biumbilicate, peripheral margin rounded to acute; wall micro-finely perforate and muricate throughout; coiling involute to evolute, chambers globular to axially compressed; may be uniapertural or biapertural with bordering lip. Differs from Laeviella by having a muricate rather than smooth test surface; differs from Polycamerella by lacking any infolding of the test wall along the sutural margin of biapertural portici.
Planohedbergella circularis
Planohedbergella escheri
Planohedbergella impensa
Planohedbergella messinae
Planohedbergella multispina
Planohedbergella prairiehillensis
Planohedbergella subcarinata
Planohedbergella ultramicra
Planohedbergella yaucoensis
Differs from all species of Planohedbergella and Laeviella by having: (1) consistent presence of a biapertural final chamber bearing broad, low apertural slits that open along the outer margin of the umbilicus and are bordered by infolding tubular apertural flaps that usually project directly into the umbilicus, (2) a more weakly lobate peripheral outline, (3) the slowest, continuously log-linear chamber expansion rate (text-figs. 4a, 4e, 6), and (4) the greatest total number of chambers in the adult test (average = 23).
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