CATALOG OF ORIGINAL DESCRIPTIONS: Marginotruncana bouldinensis Pessagno 1967
This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
Citation: Marginotruncana bouldinensis Pessagno 1967Taxonomic rank: speciesType specimens: Plate 54, figures 13-15; Plate 56, figures 4-6; 7-9; Plate 98, figure 1; 689256Type locality: From sample TX 105, collected 8 below the contact between the Eagle Ford Group and the Austin Chalk at Bouldin Creek, about 280 yds. Down the Missouri Pacific Railroad tracks east of Mary Street crossing, Austin, Travis County, TX.Type repository: Washington; USNM
Original Description Test trochospiral, spiroconvex, with 4-5 chambers in last whorl. Chambers of spiral side crescent-shaped, individually somewhat planiform; earlier chambers somewhat rugose; sutures curved, raised, often beaded. Umbilical side of test slightly concave with rugosities sometimes present on first one or two chambers of last whorl; sutures radial, straight to slightly curved; chambers wedge-shaped; predominantly depressed. Umbilicus shallow and broad though somewhat variable in size. Periphery with double keel which seems to be better developed posteriorly than anteriorly. Primary aperture extraumbilical-umbilical in position. Portici with infralaminal accessory apertures on well-preserved specimens. Outer wall radial hyaline, perforate except for double keel which is radial hyaline imperforate. Septal wall microgranular hyaline, perforate. Portici microgranular hyaline perforate (?). Etymology: named after Bouldin Creek, Austin, Travis County. Texas Extra details from original publication Remarks: Marginotruncata bouldinensis Pessagno, n. sp. differs from Marginotruncata marginata (Reuss) (1) by its much lower T'X/TX value; (2) by the thinner and more compressed nature of its test as measured along line T-T'; and (3) by the flattened nature of its chambers spirally and umbilically. It probably evolved from Whiteinella archaeocretacea Pessagno, n. sp. by obtaining a double keel and obtaining flattened chambers spirally and umbilically.
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
Marginotruncana bouldinensis compiled by the pforams@mikrotax project teamviewed: 17-6-2025
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Pessagno 1967 pl54 13-15.JPG
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Pessagno 1967 pl56 04-6.JPG
Pessagno 1967 pl56 07-9.JPG
Pessagno 1967 pl98 01.JPG
USNM 689257a-28~a.jpg
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USNM 689257b-28~a.jpg
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