CATALOG OF ORIGINAL DESCRIPTIONS: Hedbergella praelibyca Petrizzo&Huber 2006
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Citation: Hedbergella praelibyca Petrizzo&Huber 2006Taxonomic rank: speciesDescribed on page(s) : 185Type specimens: Pl. 5, Figs. 1a–c, 2a–c, 3a–c, 4a–c and 5a–c; Holotype (USNM 527791; Pl. 5, Figs. 1a–c), paratype 1 (USMN 527792; Pl. 5, Figs. 4a–c), and paratype 2 (USMN 527793; Pl. 5, Figs. 3a–c)Type age (chronostrat): Late AlbianType locality: Blake Nose, western north Atlantic, holotype from Sample 1050-27R-6, 74-78 cm, paratype 1 from Sample 1052E-38R-4, 44-46 cm, and paratype 2 from Sample 1052E -43R-6, 139.5-141.5 cmType repository: Washington; USNM
Original Description Wall macroperforate, surface with pustules irregularly scattered on test surface, sometimes becoming aligned as costellae without a preferential alignment direction. Test low trochospiral, biconvex, equatorial periphery subcircular, moderately lobulate, peripheral margin rounded. Chambers inflated and globular, 5-7 (usually 6) in final whorl, uniformly and gradually increasing in size. Sutures depressed, straight and radial. Umbilicus moderately narrow and deep. Aperture an interiomarginal, extraumbilical-umbilical with a low arch bordered by portici. Size: Holotype maximum diameter 329 µm, thickness 170 µm; paratype 1 maximum diameter 333 µm, thickness 162 µm; paratype 2 maximum diameter 301 µm, thickness 160 µm. Etymology: Ancestor of C. libyca. Extra details from original publication Distinguishing features. Hedbergella praelibyca differs from C. libyca in lacking meridionally aligned costellae. Distinguished from H. astrepta in having fewer chambers in the last whorl. Hedbergella praelibyca resembles Hedbergella portsdownensis (Williams-Mitchell, 1948) and Hedbergella brittonensis (Loeblich and Tappan, 1961, probably junior synonym of H. portsdownensis) but differs in having a lower trochospiral coiling mode, and by possessing a wall surface with more irregularly scattered pustules sometimes becoming aligned as costellae.
Phylogenetic relationships. This species probably evolved from H. delrioensis in the upper part of the R. ticinensis Zone by increasing the number of chambers in the final whorl and developing a dense, muricate ornament. It gave rise to C. libyca in the upper part of the R. appenninica Zone.
Stratigraphic range. From the upper part of the R. ticinensis Zone to the lower part of the R. globotruncanoides Zone.
References:
Petrizzo, M. R. & Huber, B. T. (2006). Biostratigraphy and taxonomy of late Albian planktonic foraminifera from ODP Leg 171B (western North Atlantic Ocean). Journal of Foraminiferal Research. 36: 166-190. gs
Hedbergella praelibyca compiled by the pforams@mikrotax project teamviewed: 17-11-2025
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