CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia margaritae primitiva Cita 1973
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Original Description Fairly small form, almost symmetrically biconvex, with a low trochospire. Equatorial periphery subrounded to slightly elongate, with a faint lobulation. Axial periphery subacute, never keeled, not even in the last-formed chamber. Growth pattern regular, with a slower increase in both the height and in the width of the chambers than in G. margaritaemargaritae. Chambers petaloid, separated by gently arched intercameral sutures, which are never limbate, but are flush to indistinct on the spiral side. Intercameral sutures subradial and slightly depressed on the umbilical side. Fairly small and shallow umbilicus; aperture slit-like, extending to the periphery, with a distinct apertural lip. Chamber wall calcareous, distinctly perforate, with an extended superficial hispidity in the early ontogenetic stages. Coiling dominantly left. Size: Equatorial diameter (passing through the last-formed chamber) 0.3-0.4 mm; equatorial diameter, perpendicular to the above, 0.25-0.35 mm; and axial diameter averaging 0.19 mm. Extra details from original publication Discussion: Globorotalia margaritae primitiva is considered to be phylogenetically related to G. margaritae margaritae with which it co-occurs for most of its range in the Lower Pliocene. It differs from the latter by its smaller size, less elongate equatorial outline, slower increase in size of chambers, more symmetrical axial profile, and complete lack of a distinct keel. In addition, it differs from Globorotalia praemargaritae Catalano and Sprovieri for having a more elongate test, a more acute axial periphery, a more rapid growth pattern, and left coiling. Further comparisons with morphologically similar taxa will follow, along with a thorough documentation of the variability of the new taxon. Editors' Notes The reference for this taxon is incorrectly given as Cita 1963 in Bolli et al. 1985 and many sources derived from it.
References:
Cita, M. B. (1973). Pliocene biostratigraphy and chronostratigraphy. Initial Reports of the Deep Sea Drilling Project. 13: 1343-1379. gs
Globorotalia margaritae primitiva compiled by the pforams@mikrotax project teamviewed: 13-8-2026
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