. Bulletin of the British Museum (Natural History) Zoology. Bull. Br. Mus. nat. Hist. (Zool.) 55(1): 1-9 Issued 25 May 1989 Structure and taxonomy of the genus Delosina Wiesner, 1931 (Protozoa: Foraminiferida) MUSEUM I >l HISTORY) 3 1 MAY 1989 STEFAN A. REVETS t ESENTED 3Y LIBRARY Koninklijk Belgisch Instituut voor Natuurwetenschappen 1ST, Vautierstraat 29, B1040 Brussel, Belgium SYNOPSIS. The systematic position of the genus Delosina is reassessed in the light of structural and morphological observations. The non-lamellar wall structure and a new type of wall ultra-structure leads to the p
. Bulletin of the British Museum (Natural History) Zoology. Bull. Br. Mus. nat. Hist. (Zool.) 55(1): 1-9 Issued 25 May 1989 Structure and taxonomy of the genus Delosina Wiesner, 1931 (Protozoa: Foraminiferida) MUSEUM I >l HISTORY) 3 1 MAY 1989 STEFAN A. REVETS t ESENTED 3Y LIBRARY Koninklijk Belgisch Instituut voor Natuurwetenschappen 1ST, Vautierstraat 29, B1040 Brussel, Belgium SYNOPSIS. The systematic position of the genus Delosina is reassessed in the light of structural and morphological observations. The non-lamellar wall structure and a new type of wall ultra-structure leads to the proposal of a new, separate suborder, the Delosinina. The species Delosina complexa, D. complanata, D. sutilis and D. wiesneri are emended and lectotypes are designated and described. D. polymorphinoides is synonymised with D. complexa. INTRODUCTION In 1907, Sidebottom described a new species, Polymorphina (?) complexa, expressing much puzzlement as to the true affiliation of this unusual taxon. After the initial description, specimens more or less referable to this form were found in a variety of localities, but always as a rare species. Sidebottom corresponded with Earland about the possible relationships of this species (fide Earland, 1934, p. 125), from which it appears that Sidebottom contemplated the erection of a new genus, Delosina, to accommodate his Polymorphina (?) complexa. He never came to publish this because of the major difficulties he encountered in handling this species, the speci- mens being small, fragile, and very transparent. Heron-Allen and Earland (1915) established the existence of secondary apertures along the sutures, which gave a 'postage stamp fracture' in broken specimens. Wiesner (1931) found a number of specimens in the material gathered by the German Antarctic Expedition and, by a happy coincidence, proposed the name Delosina as a new genus to accommodate what he considered to be the Polymorphina (?) complexa of Sidebottom (later studies showed t
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