Stictocyclus stictodiscus (Grunow) Ross

Williams, David M., 2021, Notes on the diatom collection of the Natural History Museum, London (BM) II- IV. Some type specimens in the genus Aulacodiscus Ehrenberg and nomenclatural notes on Thumia Cleve ex F. B. Taylor, Phytotaxa 480 (2), pp. 152-162 : 160

Stictocyclus stictodiscus (Grunow) Ross in Ross & Sims 1973: 108

Basionym: Actinocyclus stictodiscus Grunow in Van Heurck 1883: pl. 118, fig. 4 (see Figure 28)

Synonyms: Stictocyclus oceanica (Mereschkowsky ex F. W. Mills) F.W. Mills 1935b: 1491 = Thumia oceanica Mereschkowsky ex F. W. Mills 1935a: 1611

TYPE:— Südsee [South Pacific], BM Adams J 4132 (‘ Thumia oceanica Meresh. , Sudsee’ [Thum slide]), lectotype designated here (see Figure 27 ), BM Adams C744 (‘ Thumia oceanica Meresh. , Sudsee’, both with det. slips from Robert Ross, added: S tictocyclus stictodiscus (Grun.) ; S101985, “ Thumia oceanica Cleve ?, Südsee” http://www.nrm.se/english/researchandcollections/palaeobiology/ collections/databases/diatomaceae/ktdiatomtaxa/diatomtaxasyrz.10864.html

Figures

FIGURE 27. Thumia oceanica, BM Adams J4132; Figure 28: Reproduction of drawing of Actinocyclus stictodiscus (Grunow in Van Heurck 1883: pl. 118, fig. 4); Figure 29: Reproduction of drawing of Thumia elegans Cleve ex Lefébure & Chenevière (1938: 11, pl. 1, fig. 4); Figure 30: Reproduction of drawing of Aulacodiscus gutwinskii Pantocsek 1909: 20, pl. 1, fig. 1); Figure 31: Thumia gutwinskii (Pantocsek), Pouzdřany (= Pausram), South Moravia, BM Adams GC 3120 (‘Thumia elegans Cl., Mährer [Moravia]’), lectotype FIGURES 32–34. Thumia gutwinskii (Pantocsek), Pouzdřany (= Pausram), South Moravia, BM Adams J 4109 (‘Thumia elegans Cleve, Pausram, Moravia [Thum slide]’, with det. slip from Robert Ross added: ‘Aulacodiscus gutwinskii’).