Two examples of Auliscus radiatus from Pensacola. Described as fossil and ‘very rare’. Prepared by Arthur Charles Cole. Olympus BHB microscope using 450nm LED light. As well as the pair I imaged the lower left one at higher resolution using the 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 29 images stacked in Zerene (Pmax).
Auliscus radiatus Bailey, 1854. Published in: Bailey, J.W. (1854). Notes on new species and localities of microscopical organisms. Smithsonian Contributions to Knowledge 7(3): 1-15, un-numbered plate. Page 6, Figure 13. Also called Pseudauliscus radiatus. This is currently regarded as a synonym of Mastodiscus radiatus (Bailey) A.K.S.Prasad & Nienow, 2008. Published in: Prasad, A.K.S.K. & Nienow, J. (2008). Transfer of the extant marine diatom Pseudauliscus radiatus (Eupodiscaceae) to the forgotten genus Mastodiscus Bailey and an emended generic description of Fryxelliella. Nova Hedwigia Beiheft 133: 251-267. Page 264.