|Some genera of the Biddulphiaceae (diatoms) with interlocking linking spines|
Ross, R.; Sims, P.A. (1985). Some genera of the Biddulphiaceae (diatoms) with interlocking linking spines. Bull. Br. Mus. (Nat. Hist.) (Bot.) 13(3): 277-381
In: Bulletin of the British Museum (Natural History). Botany. British Museum (Natural History): London. ISSN 0068-2292, more
Biddulphiaceae Kützing, 1844 [WoRMS]; Marine
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The diatoms with interlocking linking spines and also large pseudocelli are described in detail and the new morphological terms 'projection' and 'Crawford step' are proposed. These diatoms comprise five genera: Briggera, gen. nov. to which we transfer the species with these characters that were previously placed in Hemaulus, Dicladiopsis which normally has heterovalvar frustules with only one valve with linking spines, Strelnikovia, gen. nov. typified by Rutilaria antiqua Streln., Keratophora, and Thaumatonema. The new taxa Briggera morenoensis, B. monoligata, B. vemae, B. robusta, B. bonei, B. paratethyos, B. ornithocephala subsp. atlantica, Dicladiopsis alta, D. erecta, Strelnikovia tumida, S. inclinata, S. reniformis, and S. incerta are described and named; three others, one each from Briggera, Dicladiopsis, and Strelnikovia, are described but not named because we had insufficient material. All representatives of these genera are marine and fossil. They range in age from the upper Turonian-Coniacian (upper Cretaceous) to the early Miocene. There are species of Biddulphia which resemble some species of Briggera extremely closely except for the lack of linking spines, and others equally close to Strelnikovia but differing in the same way. The existence of these species brings into question the division of the Biddulphiaceae into the subfamilies Biddulphoideae and Hemiauloideae on the basis of the occurrence of linking spines in the latter.