Recent benthonic foraminifera from Brasil, morphology and ecology; Part IV, Trochamminids from the Campos shelf with description of Paratrochammina n. gen
Paläontologische Zeitschrift 53(1-2): 5-25
Paratrochammina n. gen., type speciesParatrochammina madeirae n. sp., is proposed for trochamminids with a single interiomarginal, axial-extraaxial aperture which communicates directly with an axial cavity devoid of lamellar structures. Described and illustrated by scanning photographs and optical sections areParatrochammina simplissima (Cushman and McCulloch),Paratrochammina clossi n. sp.,Paratrochammina madeirae n. sp., andTrochammina boltovskoyi n. sp. All these trochamminids, exceptingParatrochammina madeirae n. sp., have been recorded from the shallow waters of the Campos shelf, Brasil, which is under the influence of the cold water Falkland (Malvin) current.Paratrochammina madeirae n. sp. has been only encountered in a sample from the Brasilian shelf between Lat. S 22° und 28°, where it is associated withTrochammina boltovskoyi n. sp. Also illustrated isPortatrochammina pacifica (Cushman) from the Chilean shelf at Cobija and from the Beaufort Sea, Arctica. Further it is proposed to considerTrochammina advena Cushman, 1922 as a nomen non conservandum.