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The Foraminiferal Genus Astrononion Cushman and Edwards

N. de B. Hornibrook
Micropaleontology
Vol. 10, No. 3 (Jul., 1964), pp. 333-338
DOI: 10.2307/1484580
Stable URL: http://www.jstor.org/stable/1484580
Page Count: 6
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The Foraminiferal Genus Astrononion Cushman and Edwards
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Abstract

A neotype from Las Palmas is selected for Astrononion stelligerum (d'Orbigny). External sutural plates in this and some other species of Astrononion are shown to have developed from sutural tubes; consequently, the genus Pacinonion Vella, erected for species with sutural tubes, is considered a junior synonym of Astrononion. Three subgenera of Astrononion are proposed: Astrononion (umbilicate, with sutural tubes sometimes modified as plates; type: Nonionina stelligera d'Orbigny); Laminononion, new subgenus (non-umbilicate with rhomboidal or triangular plates covering the umbilicus; type: Astrononion tumidum Cushman and Edwards); and Fijinonion, new subgenus (umbilicate with broad, fused apertural plates; type: Astrononion fijiensis Cushman and Edwards).

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