Coronia hardmanianus D. M. Williams, comb. nov.
Creators: name: Williams, David M.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Chromista
Ochrophyta
Bacillariophyceae
Surirellales
Surirellaceae
Coronia
Coronia hardmanianus

description: Coronia hardmanianus (Grev. ex Deby) D.M.Williams comb. nov.   
Registration: http://phycobank.org/104167 (name), http://phycobank.org/104169 (type)  
 BASIONYM:— Campylodiscus hardmanianus Grev. ex Deby (1891: 68, pl. 15, fig. 78, Figures 1, 2)   
 TYPE:— HONG KONG, BM 8909 (Deby slide: ‘L.H.[ardman] (D) | No. 199 | Hong Kong’ [one specimen of Campylodiscus hardmanianus in centre surrounded by six specimens of Eupodiscus jonesianus Greville = Coscinodiscopsis jonesiana (Grev.) Sar & Sunesen], see Figures 5, 6, lectotype designated here; BM 9000 (Deby slide: ‘ L.H.[ardman] | No. 200 | Hong Kong’ [selected specimens], see Figures 7, 8; BM Adams GC831 (‘ Campylodiscus daemelianus | 9.81 | 26/33 | Hong Kong’ (five specimens, Figures 17, 18); BM Adams G304 (‘ Hong Kong | E.G.[rove] 12/87’, four specimens, see Figures 9, 10, two specimens); BM 8910 (Deby slide: ‘ Campylodiscus hardmanianus Grev. | 9/81 | Hong Kong’, two specimens, broken coverslip, Figures 11, 12, one specimen).   
 OTHER MATERIAL:— AUSTRALIA, ‘Carpentaria Bay’ [= Arafura Sea, Gulf of Carpenteria], BM 8976 (Deby slide: ‘Carpentaria Golf | Australia’, J.D.Möller), BM 12860 [Cleve & Möller Diatoms, no. 80, two selected specimens, Figure 13]; BM Adams C & M 80 [three selected specimens], Cleve & Möller Diatoms, no. 80 (Cleve & Möller 1878a: [2]).   
 JAPAN, BM Adams GC830 (‘ Campylodiscus daemelianus from Japanese Oysters | 29.9.84’, two specimens); BM 42968 (‘Kobé, Japan | 5 fathom s | Payne 7845’, one speci men).   
Java, Samarang, BM Adams GC 833 (‘ Campylodiscus daemelianus | Samarang | 29/12/88 | seven specimens, Figures 15, 16)  
INDONESIA, MINTOK [sic, MUNTOK], BM 55882 (‘A.D. [= Donkin?] 1884’, Wynne Baxter 1254)  
 INDIA, COCHIN, BM 9009 (Deby slide: ‘ Campylodiscus hardmanianus! ’)   
 Of Campylodiscus hardmanianus, Greville produced a figure (the unpublished drawing is reproduced in Figure 14) and a detailed description (his unpublished hand-written description is reproduced in Figures 3 and 4). Deby wrote several different, sometimes contradictory, passages on Campylodiscus hardmanianus. First, he notes: ‘ Campylodiscus Hardmanianus. Grev. in litt. (1866) Hardman’s Coll., Deby’s Coll., Nos. 199, 200 [= BM 8909, BM 9000, respectively] = C. Sonderianus, Grun. in litt., Möller’ (Deby 1891: 25, for C. Sonderianus see below) – both Hardman slides are in BM.   
 Later, Deby writes: ‘* C. Hardmanianus. Grev., from Hong Kong and from Carpentaria, var. from Caspian Sea’ (Deby 1891: 43, the * means Deby had in his possession those specimens: ‘The forms preceded by a * are now in my cabinet from the localities indicated after their names’). ‘Carpentaria’ probably refers to the specimens represented by Cleve & Möller’s slide no. 80 (Cleve & Möller 1878a, ‘Carpentaria Bay’ [= Arafura Sea, Gulf of Carpenteria], BM 12860, Figure 13, and another at BM Adams ‘C & M 80’) or from the Möller slide (BM 8976, ‘Carpentaria Golf | Australia’), the reference to the ‘var. from Caspian Sea’ is dealt with below.   
 Finally, there are notes on the structure of this species (Deby 1891: 54), with ‘Area quadrangular. About twenty rows of granules to each long side of area. Granules small or medium size’, when the species is placed in ‘Group III, The Hyalinae’, and later (Deby 1891: 60), when the species is placed in ‘Group IV, Punctatae’ it is described simply as ‘area quadrate’. Deby (1891: 68-9, Figure 1) provides a full description along with a note on his new variety: ‘This diatom is from Hong-Kong. A smaller var., with central portion of area clepsydrate, is from Derbend [Russia], in the collection of Mr. Grove (slide 236). I call this C. Hardmanianus var. Grovii. This diatom is probably a form of the much commoner C. daemelianus, Grun. The original specimen named by Greville is in my collection’ (Deby 1891: 69).   
None of the specimens examined match exactly that depicted in Deby (1891: pl. 15, fig. 78, Figure 2), as they lack the adjacent specimens partially captured in the published figure so a holotype has not been recognised, even though it is probably one of these specimens.
description: Published as part of 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, pp. 53-64 in Phytotaxa 629 (1) on pages 54-57, DOI: 10.11646/phytotaxa.629.1.4, http://zenodo.org/record/10254878