Staurastrum pseudoteliferum G.J.P.Ramos, C.E.M.Bicudo & C.W.N.Moura, 2018

Ramos, Geraldo José Peixoto, Bicudo, Carlos Eduardo De Mattos & Moura, Carlos Wallace Do Nascimento, 2018, Some new, rare and interesting desmids from bromeliad phytotelmata in Brazil, Phytotaxa 346 (1), pp. 59-77 : 71

Staurastrum pseudoteliferum G.J.P.Ramos, C.E.M.Bicudo & C.W.N.Moura sp. nov. ( Figs 105–110 )

Cells 3–radiate, 1.3 times longer than wide, median constriction deep, sinus open; semicells broadly elliptic, subtriangular in apical view, angles widely rounded, margins straight between processes, provided with stout spines usually arranged linearly or slightly curved in 2 rows of 4 spines at angles, with approximately 9 tiny spines in the margins (3 on each side). Cells 31–32.5 μm long (without spines), 23.5–25 μm wide, 10–11.5 μm isthmus.

Holotype: material numbered ( HUEFS 224653 !) deposited at Herbário da Universidade Estadual de Feira de Santana , population partially illustrated here in LM ( Figs 105–106, 109–110 ) and SEM ( Fig. 107–108 ).

Paratypes (here designated): HUEFS 224684, HUEFS 224705, HUEFS 224716 (Herbário da Universidade Estadual de Feira de Santana, Feira de Santana, Brazil)

Type locality and habitat: Collected at “Serra da Jiboia” Santa Teresinha, Bahia state, Brazil. 12° 51’ 7” S, 39°28’ 35.4” W. Sample collected by G. J. P.Ramos, C. W. N. Moura and M. A. Santos ( HUEFS 224653) on 14 January 2015. Staurastrum pseudoteliferum was observed in samples collected in bromeliad tanks ( Alcantarea nahoumii ); T 26.7 (± 3.1 ºC). pH 6.0 (± 0.5). C 0.22 (± 0.17 mS. cm-1). TDS 0.13 (± 0.11 ppt). DO 7.5 (± 4.3 mg.L- 1).

Etymology:—Due to morphological similarly with Staurastrum teliferum

Notes:— Staurastrum pseudoteliferum differs from Staurastrum teliferum Ralfs (1848: 128) by having two rows of 4 spines at the angles in the ventral view, apical view showing approximately 9 small spines located near the margins, 3 on each side. Additionally, S. teliferum has, in apical view, triangular semicells with slightly concave margins, with 5 tiny spines on each side. Another taxon similar is St. teliferum var. groenbladii Förster (1964) , however, this variety differs by having semicircular-slightly elliptic cells (in front view), semicells ovoid (to subsphaerical) in apical view, and thicker spines.

Figures

FIGURES 93–112. Netrium digitus: LM (93–95); SEM (96); Pleurotaenium trabecula: LM (97–98); SEM (99–100); Staurastrum pseudosebaldi var. compactum LM (101–104), ventral view (101–103), apical view (104); Staurastrum pseudoteliferum sp. nov.: LM (105–106, 109–110); SEM (107–108), ventral view (105–107), apical view (108–110); Xanthidium mamillosum var. borgei: LM (111– 112); ventral view (111), apical view (112). Scale bar 50 μm (93–95), 60 μm (92–94), 40 μm (97), 30 μm (104–105, 111–112), 20 μm (96, 99–100), 10 μm (98, 101–108)