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Current identification/main database link: Marginotruncana pseudolinneiana Pessagno 1967
Original Description
Extra details from original publication
Derivation of name: Discovery under the zodiacal sign of Scorpio.
Remarks: M. scorpionis is differentiated from M. renzi (Gandolfi) by having two keels and by having chambers with the axial section subrectangular in the inner whorls. like M. pseudolinneiana Pessagno. instead of having chambers with the axial section rhomboidal or truncate. and from M. pseudolinneiana Pessagno by having the ventral side distinctly convex rather than flat. M. scorpionis has often been referred to G. tricarinata (Quereau) in assemblages of Turonian-Santonian age. Reichel (1950) cited the passage from specimens of G. tricarinata with a flat ventral side to those that are umbilicoconvex. Hagn and Zeil (1954) and Moorkens (1969) have also illustrated specimens of this taxon as G. tricarinata (Ouereau). Lamolda (1975) cited as G. ct. primitiva Dalbiez specimens that have now been reclassified as M. scorpionis Lamolda. This new species evolved from M. pseudolinneiana Pessagno by adult variation. Populations of the latter species include occasional specimens with an elevated umbilical shoulder on the last chambers; M. scorpionis Lamolda appears when this feature develops on all chambers of the outer whorl.
Occurrence: To date. M. scorpionis is known only in Europe (Bavaria, Belgium, northern Spain). where it is associated with Dicarinella schneegansi (Sigal), D. imbricata (Mornod), M. cf. sigali (Reichel), M. renzi (Gandolfi), M. pseudolinneiana Pessagno, M. fungicamerata (Martirosjan) and M. coronata (Bolli). The first specimens appeared after the extinction of Helvetoglobotruncana helvetica (Bolli).
Range: Uppermost Turonian to Santonian.
Lamolda, M. (1977). Lamolda, M. (1977). Three new species of planktonic foraminifera from the Turonian of northern Spain. Micropaleontology. 23: 470-477. Micropaleontology. 23: 470-477. gsReferences:
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Marginotruncana scorpionis compiled by the pforams@mikrotax project team viewed: 17-6-2025
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