CATALOG OF ORIGINAL DESCRIPTIONS: Planoheterohelix praenuttalli Haynes, Huber & MacLeod 2015
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Original Description Test relatively large (typically greater than 300 microns in length, average is 304 microns, n = 11), broadly rounded, consists of 9 to 12 chambers (n = 12) that are biserially arranged and globular throughout. The diameter of the proloculus is variable (range = 15 to 32 microns, n = 7) and subsequent chambers rapidly increase in size, resulting in a strongly tapered, subtriangular outline in side and edge views. Sutures are straight, strongly depressed, and generally meet the central axis at a right angle. Aperture is a symmetrical semicircular, low, broad arch at the base of the final chamber, bordered by an imperforate lip. Periapertural flanges are absent. Test wall is calcitic and hyaline. Chamber surface is finely perforate to macroperforate (pore diameter = 0.9 to 3.2 microns, n = 2) and is ornamented with costae that vary from almost completely smooth to those with discontinuous costae that are up to 4.3-microns thick. Distinguishing features. Planoheterohelix praenuttalli is generally large, strongly tapering, and almost as broad (in edge view) as it is wide (in side view). Editors' Notes Described as Planoheterohelix praenuttalli the name has since been corrected to Planoheterohelix praenuttallii
References:
Haynes, S., Huber, B. T. & MacLeod, K. G. (2015). Evolution and phylogeny of mid-Cretaceous (Albian-Coniacian) biserial planktic foraminifera. Journal of Foraminiferal Research. 44: 42-81. gs
Planoheterohelix praenuttalli compiled by the pforams@mikrotax project teamviewed: 25-1-2026
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