Stictodiscus manilensis D.M.Williams, P.A.Sims, & J.Witkowski, 2021

Williams, David M., Sims, Pat A. & Witkowski, Jakub, 2021, Notes on the diatom collection of the Natural History Museum, London (BM) V: (a) ‘ Stictodiscus manillensis’ nom. nud., (b) Stictodiscus pantocsekii and ‘ Stictodiscus pantocsekii var. minor’, (c) a note on the name ‘ Stictodiscella’; and (d) some comments on Jósef Pantocsek’s Beiträge zur Kenntnis der Fossilen Bacillarien, Phytotaxa 507 (2), pp. 167-174 : 169

Stictodiscus manilensis D.M.Williams, P.A.Sims, & J.Witkowski , sp. nov.

Type:— Philippines: Manila (‘ Manilla’ ), (holotype BM Adams F 1148 = Fig. 1 , one specimen) ; BM 5473 (Deby, one specimen) , BM 7431 (Deby, one specimen) , BM 8865 ( Deby , ‘ Manilla’ = Fig. 3 , one specimen) , BM 10652 ( Deby , L.H. 826, two specimens) , BM 45641 (Sturt, A578, three specimens) , BM 45863 (Sturt A800, one specimen) . Singapore: BM 10435 (Deby, L.H. 547, one specimen) .

Valves circular with flat valve face; mantle distinctive. Valve with small central annulus, radiating network of ‘siliceous bars’ leading to areolae, mostly biseriate. Raised siliceous thickenings surround series of radiating inner areolae, becoming more conspicuous towards valve mantle. No other surface structures.

Figures

FIGURES 1–4. 1. Stictodiscus manilensis, Manila (‘Manilla’), BM Adams F 1148 (one specimen = holotype). 2. Psammodiscus?, Manila, BM 7431 (one of six specimens). 3. Stictodiscus manilensis, Manila (‘Manilla’), BM 8865 (‘Manilla’, one specimen). 4. Psammodiscus?, no locality, BM 7432 (one of four specimens). Scale bar = 20 μm.