Moralesonia australis D. M. Williams, Ts. Georgiev, T. M. Schust. & C. E. Wetzel, 2024

Williams, David M., Georgiev, Tsvetoslav, Schuster, Tanja M. & Wetzel, Carlos E., 2024, The relationships of Eunotogramma frauenfeldii (Bacillariophyta) I. An account of its structure and description of the new genus Moralesonia, Plant Ecology and Evolution 157 (3), pp. 270-290 : 270-290

Moralesonia australis D. M. Williams, Ts. Georgiev, T. M. Schust. & C. E. Wetzel sp. nov.

Fig. 7

Type locality.

Australia, Carpentaria Bay ( Arafura sea ), BM 12829 ! (= Fig. 7 E – F ), holotype (= Cleve & Möller Diatoms [no.] 61, “ Carpentaria Bay ”, as Euodia Fraunfeldii Grunow ), and BM Adams ‘ Cleve & Möller [no.] 61 ’!, isotype . BM 31718 ! [Comber 927], “ Carpentaria Golf ”, Australia, J. D. Möller [no. 896, 1889] ; BM 6481 ! (‘ Euodia Fraunfeldii Grun. | Australien | J. D. Möller’, Fig. 7 G ) , BM 60070 ! (J. D. Möller ex Wynne Baxter 6992) ; BM 74090 ! (J. D. Möller ex Wise [no.] 1918, “ Australie ”) ; BM 26837 ! (as “ Eunotogramma frauenfeldii Grun. | Australie ”, Van Heurck 1885: 118, sér. XXII, no. 526 = Fig. 7 A – E ) and BM Adams HVH 526! ; W 0164933 ! (Grunow sample 1484) (J. D. Möller, “ Carpentaria Golf , Australia ”), isotype, Fig. 7 D, H – I , Grunow’s drawings, catalogue notes, and slide; BRM HB- 19–20 .

Registration.

http://phycobank.org/104548

Description.

Valves lunate, occasionally fusiform, length 55–65 μm, width 20–25 μm, width ± constant, forming less convex ventral margin. Each valve with two transapical ribs dividing valve into three ± equal parts. Ribs evident externally by clear area, extending through to entire mantle, indicating it as part of valve. Internally raised by 2–3 μm, tapering towards mantle edge. Areolae ± round, radiating from eccentric hyaline centre. Rimoportulae absent. Cribra detail not visible or preserved. Girdle unknown. Species synapomorphy: large and diffuse areolae.

Notes.

It is quite possible that all the material cited above is from the same source: Carpentaria Bay (Arafura Sea), Australia, which is a reasonably large area. The notes on the material for Cleve and Möller slide no. 61 simply state “ Comm. [unicavit] I. D. Möller [= Johann Diedrich Möller] ” ( Cleve and Möller 1878: 2).

Figures

Figure 7. Moralesonia australis. A – C. Moralesonia australis, BM 26837 (as “ Eunotogramma frauenfeldii Grun. | Australie. ”, Van Heurck 1885: 118, sér. XXII, no. 526), scale bar = 20 µm. D, H, I. Grunow’s drawings, catalogue notes on his sample 1484 (W 0164933), and slides. E, F. BM 12829 (Australia, Carpentaria Bay (Arafura Sea), holotype (= Cleve and Möller Diatoms [no.] 61, “ Carpentaria Bay ”, as Euodia Fraunfeldii Grun. )), scale bar = 20 µm. G. BM 6481 (“ Euodia Fraunfeldii Grun. | Australien | J. D. Möller ”), scale bar = 20 µm.