Luticola poliporea M.Rybak, Peszek, Luthfi, Arsad & A.Witkowski, 2024

Rybak, Mateusz, Peszek, Lukasz, Luthfi, Oktiyas Muzaky, Arsad, Sulastri, Kociolek, John Patrick & Witkowski, Andrzej, 2024, Description of five new Luticola D. G. Mann (Bacillariophyta, Diadesmidaceae) species from Indonesia with comments on the morphological boundaries of the genus, PhytoKeys 237, pp. 1-22 : 1

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Luticola poliporea M.Rybak, Peszek, Luthfi, Arsad & A.Witkowski

sp. nov.

Luticola poliporea M.Rybak, Peszek, Luthfi, Arsad & A.Witkowski sp. nov.

Figs 3A-W View Figure 3 , 8A-G View Figure 8 , 9A-G View Figure 9


LM observations (Fig. 3A-W View Figure 3 ). Frustules rectangular in girdle view, lanceolate or linear-lanceolate with rostrate apices. Range of valve dimensions (n = 100): 12.5-39.0 μm long, 5.3-9.0 μm wide and 20-24 striae in 10 µm. Striae clearly punctate. Central area slightly bow-tie-shaped, axial area linear and narrow. Isolated pores clearly visible in central area. Usually two isolated pores are present, in about 2% of the type population, a third isolated pore occurs (Fig. 3C, J, K, T, A, C View Figure 3 ).

SEM observations (Figs 8A-G View Figure 8 , 9A-G View Figure 9 ). External view: Striae composed of 4-5 slightly elongated areolae, almost equal in size (Fig. 8A-G View Figure 8 ). Single row of elongated areolae, interrupted at valve apices, present on the valve mantle (Fig. 8G View Figure 8 , 9G View Figure 9 ). Central area bordered by three areolae (Fig. 8A-F View Figure 8 ), ghost areolae commonly present in central area (Fig. 8A-F View Figure 8 ). Raphe filiform located on distinct raphe sternum (Fig. 8A-G View Figure 8 ). Distal raphe endings hooked and continued on to valve mantle (Fig. 8G View Figure 8 ), proximal raphe endings weakly deflected and finishing slightly pore-like enlarged (Fig. 8A-E View Figure 8 ). External openings of isolated pores elongated located in mid-way between valve margin and valve centre. Isolated pore opening on side where raphe endings are deflected commonly are smaller and shifted from centre part into striae (Fig. 8A-E View Figure 8 ). Edge of the valve mantle notched approximately half-way between centre and pole in each quadrant of the valve (Fig. 9C View Figure 9 ).

Internal view: Areolae occluded by hymenes forming continuous strip (Fig. 9A-D View Figure 9 ). Raphe slits straight (Fig. 9A-E View Figure 9 ). Proximal raphe endings simple and straight (Fig. 9A-C, E, F View Figure 9 ), distal raphe endings forming small helictoglossa (Fig. 9C, D View Figure 9 ). Isolated pore openings with large circular structure (Fig. 9A-C, E, F View Figure 9 ), openings of additional pores commonly reduced (Fig. 9B, C, F View Figure 9 ). Longitudinal channels visible along valve (Fig. 9A-F View Figure 9 ).


Indonesia, Malang, East Java, unnamed spring, 7°50'26.2"S, 112°31'43.0"E, coll. 2 July 2023. Holotype slide no. SZCZ28794! and unmounted material with the same number in the Szczecin Diatom Collection ( University of Szczecin , Poland), isotype slide no. 2023/81 and the unmounted material with the same number at the University of Rzeszow GoogleMaps , Poland. The type population is illustrated in Figs 3A-W View Figure 3 , 8A-G View Figure 8 , 9A-G View Figure 9 .


Name refers to the unusual feature of bearing multiple isolated pores.


So far, species observed only in the type locality.

Ecology and associated diatom flora.

The species was most abundant in a sample of moss from collected from spring - where it reached 30% of the total share in diatom assemblage; together with the described species, also occurred: Diadesmis confervacea Kützing, Mayamaea sp., various Nitzschia spp., Navicula cf. germainii Wallace and Sellaphora nigrii (De Notaris) Wetzel & Ector. The species was also observed in samples of other habitats from the same spring (sediments, epilithon), but in lower numbers.