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Recent benthonic foraminifera from Brasil Morphology and ecology Part IV: Trochamminids from the Campos shelf with description ofParatrochammina n. gen.

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Kurzfassung

Für Trochamminiden mit einer einzigen interiomarginalen Mundöffnung, die direkt mit einer axialen Vertiefung ohne lamelläre Strukturen in Verbindung steht, wird das neue GenusParatrocbammina, mitParatrocbammina madeirae n. sp. als Typusspezies, eingeführt. Im weiteren beschrieben:Paratrocbammina clossi n. sp.,Paratrocbammina simplissima (Cushman and McCulloch) undTrocbammina boltovskoyi n. sp. Alle diese Trochamminiden, mit Ausnahme vonP. madeirae, stammen aus den küstennahen Gebieten des Campos Shelfs, Brasilien, dessen Benthos nodi unter dem Einfluß der kalten Falkland (Malvin)-Strömung steht.Paratrocbammina madeirae n. sp. wurde zusammen mitT. boltovskoyi n. sp. in einer Probe des brasilianischen Shelfes zwischen Lat. S 22° und 28° gefunden. Zum Vergleich mitParatrocbammina wurden Exemplare vonPortatrochammina pacifica (Cushman) von Cobija, Chili, und vom arktischen Beaufort Meer abgebildet. Zum Schluß wird vorgeschlagen,Trocbammina advena Cushman, 1922, als einen nomen non conservandum zu betrachten.

Abstract

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.

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Brönnimann, P. Recent benthonic foraminifera from Brasil Morphology and ecology Part IV: Trochamminids from the Campos shelf with description ofParatrochammina n. gen.. Paläontol. Z. 53, 5–25 (1979). https://doi.org/10.1007/BF02987785

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