Mallomonas calceolus D.E.Bradley

Kapustin, Dmitry A., Gusev, Evgeniy S., Lilitskaya, Galina G. & Kulikovskiy, Maxim S., 2020, Silica-scaled chrysophytes from the Ukrainian Polissia, Cryptogamie, Algologie 20 (12), pp. 121-135 : 126

Mallomonas calceolus D.E.Bradley

( Fig. 2E, F )

DISTRIBUTION. — Widely distributed ( Kristiansen & Preisig 2007; Řezáčová & Neustupa 2007).

REMARKS

We found two scales which look quite different. The first one was recorded from site 9. It represents an anterior scale. The scale shield and a dome are covered with widely-spaced papillae. The one of the anterior submarginal ribs terminates in a short projection ( Fig. 2E ). Another scale was recorded from site 13. Its shield is covered with papillae regularly-spaced and arranged in rows and the dome is smooth. A distinct base plate pore is visible at the base of the V-rib ( Fig. 2F ). The similar scale was depicted by Bradley (1964, pl. 1, fig. 3). Although the number of papillae may significantly vary ( Kristiansen 2002), the presence of the base plate pore was not mentioned in the protologue ( Bradley 1964). Probably, the scale in Figure 2F belongs to another Mallomonas species but more scales are needed to confirm this suggestion.

Figures

FIG. 2. — Mallomonas Perty taxa from the Ukrainian Polissia: A, Mallomonas acaroides Perty emend. Iwanoff, SEM; B, Stomatocyst of Mallomonas cf. akrokomos Ruttner,SEM; C, Mallomonas annulata (D.E.Bradley) K.Harris, SEM; D, Mallomonas asmundiae (Wujek & van der Veer) K.H.Nicholls, SEM; E, F, Mallomonas calceolus D.E.Bradley, SEM; G, Mallomonas canina Kristiansen, SEM; H, Mallomonas caudata Iwanoff emend. Willi Krieger, SEM; I, Mallomonas corcontica (Kalina) L.Ş.Péterfi & Momeu, SEM; J, Mallomonas costata Dürrschmidt, SEM; K, Mallomonas crassisquama (Asmund) Fott, SEM; L, Mallomonas cratis K.Harris & D.E.Bradley, TEM;M, Mallomonas elongata Reverdin, SEM; N, Mallomonas heterospina J.W.G.Lund, SEM; O, Stomatocyst of Mallomonas mangofera var. foveata (Dürrschmidt) covered with scales, SEM. Scale bars: A, D-F, H-K, 1 µm; B, C, L-O, 2 µm; G, 0.5 µm.