Campylodiscus sonderianus ’ Grunow

Williams, David M., 2023, Notes on the diatom collection of the Natural History Museum, London (BM) IX: Campylodiscus hardmanianus, with a discussion on synapomorphy and the poverty of molecular monophyly, Phytotaxa 629 (1), pp. 53-64 : 57

‘ Campylodiscus sonderianus ’ Grunow

It is hard to track down the first use of the name ‘ C. sonderianus ’, a name that seems to have never been validly published. It may first have been used in connection with one of Möller’s slides (Möller 1868: 16, but with no locality details; later in the catalogues of Möller 1877: 13 as ‘ Campylodiscus Sonderianus Grun. n. sp. ’ [ Figure 24 ], Möller 1883: 15, and Möller 1897: 15). One item in BM is a relevant Möller slide. The specimens are mounted within a frame that has the name of each taxon appended below the specimen. The portion with the label ‘ C. sonderianus ’ is broken, and the specimen has moved its position (BM 35870, ‘Typen-Platte | I.D. Möller’). It is possible that the specimen in Figure 23 is the one in question, just re-located to a different position on the slide. De Toni (1892:616) records it as ‘ C. Sonderianus Grun. mscr.’ in Habirshaw (1877: 58, as ‘ C - Sonderianus Grun.’). And yet another damaged slide, BM 22983, has no specimen of any Campylodiscus (which may have been lost or destroyed when this slide was damaged). ‘ C. sonderianus ’ does not appear in the later publication of Möller (1892), but Campylodiscus hardmanianus ( Möller 1892: 20, ‘M. Mittelm.’ [= Mittelmeer. = Mediterranean Sea] and ‘M. St. Ocean’ [Southern Ocean]) and Campylodiscus daemelianus Grun. ( Möller 1892: 128 [‘Nördlicher Stiller Ocean’], p. 141 [‘Südlicher Stiller Ocean’]) are both included. Specimens may be illustrated but remained unidentified in Möller (1891: tafs 50 and 52).

One last slide to consider is BM 64450 from ‘Challenger Station 233’, a ‘T.E.Doeg’ slide (see http://www. microscopist.net/DoegTE.html) with three selected specimens (one is in illustrated in Figures 28-9 ; the lower label has ‘middle of Atlantic 8 ftms’, suggesting a later anonymous correction). This slide is labelled for Campylodiscus sonderianus ’. It is the same material that was used for BM 9007, which is the type slide for Campylodiscus challengerensis ( Deby 1891: 69, ‘[…] station 233 […] Challenger […] T.E.Doeg’; also BM Adams GC 801).

Figures

FIGURES 19–29. Figures 19, 20: Specimens of Campylodiscus hardmanianus var. grovei Deby from BM Adams GC829, ‘Derbend’, Caspian Sea, Russia, scaLe bar = 20μm. Figures 21, 22: Specimens of Campylodiscus hardmanianus var. grovei Deby from BM 53492, ‘Derbent’, Caspian Sea, Russia, scale bar = 50μm. Figure 23: Specimen (?) of ‘C. sonderianus’ from BM 35870, ‘TypeN-PLatte | I.D. MöLLer’, scaLe bar = 50μm. Figure 24: Reproduction of the published name (designation) for ‘Campylodiscus Sonderianus Grun. n. sp.’ in Möller (1877, p. 13). Figures 25, 6: Specimens of Campylodiscus daemelianus from BM 26853, ‘Yarra, Yarra’, Australia (Van Heurck, Types du Synopsis des Diatomées de Belgique, No. 542 (‘Yarra-Yarra (AUstraLie)’, scaLe bar = 50μm. Figure 27: Specimen of Coronia echeneis from Wismar, Germany, BM 12875, Cleve & Möller, no. 115, ‘Lebend im Hafen von Wismar’, scaLe bar = 20μm. Figures 28, 9: Specimen of ‘C. sonderianus’ from BM 64450, ‘ChaLLeNger StatioN 233’, ‘T.E.Doeg’, scaLe bar = 50μm.