CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana loeblichi Pessagno 1967
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Citation: Globotruncana loeblichi Pessagno 1967Taxonomic rank: speciesType specimens: Plate 73, figures 1-4; Plate 97, figure 10; 689265Type sample (& lithostrat): Lower Taylor MarlType locality: From sample TX 375, collected at the base of a clay pit of the Baron Brick Company, Palmer, Ellis County, TX.Type repository: Washington; USNM
Original Description "Test trochospiral, planiform, compressed spirally and umbilically (spiral often concave); lobulate peripherally with medium-sized double keel of G. linneiana type; keels diverging and dichotomous. Spiral rim of double keel often spinose in early part of final whorl. Test comprised of 2 whorls of chambers which expand rapidly in size in the first whorl and more slowly in the final whorl; 4-5 chambers in the final whorl. Chambers in final whorl petaloid in shape spirally; subrectangular in shape umbilically; separated by curved, elevated beaded sutures spirally and by straight to slightly curved, elevated, beaded sutures, umbilically. Test showing some rugosities on spiral surface of final whorl particularly on early chambers. Umbilicus wide, shallow, covered by tegilla showing infralaminal and intralaminal accessory apertures. Primary aperture interiomarginal, umbilical in position. Outer wall radial hyaline perforate except for keel, beads, rugosities, and peripheral spines. Keels ultragranula hyaline imperforate and radial hyaline imperforate; rugosities, beads, and peripheral spines ultragranular hyaline imperforate. Septal walls and tegilla microgranular hyaline, finely perforate." Etymology: named after Alfred R. Loeblich. in honor of his great contributions to the field of micropaleontology. Extra details from original publication Remarks: G. loeblichi Pessagno, n. sp. is related phylogenetically to G. linneiana (d'Orbigny) (Text-figure 35). It differs from G. linneiana (1) by the thinner (less high) nature of its double keel; (2) by the highly compressed natute of its test along a spiral-umbilical axis; (3) by the dichotomous (diverging) nature of its double keels in peripheral view; and (4) by the imbticate nature of its chambers in peripheral view.
References:
Pessagno, E. A. (1967). Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. Palaeontographica Americana. 5: 245-445. gsO
Globotruncana loeblichi compiled by the pforams@mikrotax project teamviewed: 20-6-2025
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holotype-78.jpg
Pessagno 1967 pl73 01-4.JPG
Pessagno 1967 pl97 10.JPG
holotype-78.jpg
Pessagno 1967 pl73 01-4.JPG
Pessagno 1967 pl97 10.JPG
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