Tryblionella confusa Bertolli et Torgan, 2019

Bertolli, Lucielle Merlym, Talgatti, Dávia Marciana, Nascimento, Thamires Mariah Da Silveira & Torgan, Lezilda Carvalho, 2019, Two new species of Tryblionella W. SMITH (Bacillariaceae, Bacillariophyta) from a southern Brazil salt marsh, Phytotaxa 399 (3), pp. 173-186 : 175-176

publication ID

https://doi.org/ 10.11646/phytotaxa.399.3.1

DOI

https://doi.org/10.5281/zenodo.13715556

persistent identifier

https://treatment.plazi.org/id/694B3D77-FFF1-FFC8-FF19-18D1FEC777E9

treatment provided by

Felipe

scientific name

Tryblionella confusa Bertolli et Torgan
status

sp. nov.

Tryblionella confusa Bertolli et Torgan sp. nov. ( Figs 2–21 View FIGURES 2–13 View FIGURES 14, 15 View FIGURES 16–21 )

LM observations: Valves elliptic-lanceolate, very slightly constricted in the median region, with slightly cuneate to rounded apices and longitudinal fold slightly noticeable, 16.30–27.56 μm long and 7.17–10.00 μm wide. Raphe eccentric and fibulae weakly distinguishable (7–10 in 10 μm). Striae inconspicuous and axial area absent. The valvar face presents two different patterns, one side presents transapical ribs, parallel to somewhat radiate, unequally spaced (13–16 in 10 μm). The other side lacks these or other kind of structures.

SEM observations: The transapical ribs are asymmetric, becoming larger closer to the valve center, assuming a spatulate shape ( Figs 14 View FIGURES 14, 15 , 16, 17 View FIGURES 16–21 ). Striae parallel (40–42 in 10 μm), formed by a single line of rounded poroids (80 in 10 μm). The striae are more easily recognized among the transapical ribs, in the other side of the valve face they are less conspicuous and closer to valvar margin they are formed by a transapically elongate perforations ( Figs 14 View FIGURES 14, 15 , 17 View FIGURES 16–21 ). The valve margin is thickened in the raphe side and a flattened silica projection is deflected towards the valve face, as well as distal raphe endings ( Figs 18, 19 View FIGURES 16–21 ). The cingulum is composed by several non-perforated bands (Fig. 86). The mantle is striated (40–42 in 10 μm) ( Figs 14–16 View FIGURES 14, 15 View FIGURES 16–21 ). The longitudinal fold is more remarkable internally ( Fig. 15 View FIGURES 14, 15 ). It was not possible to confirm the presence of helictoglossae ( Figs 20, 21 View FIGURES 16–21 ).

Holotype: — BRAZIL. Rio Grande do Sul State, Rio Grande city, Ilha da Pólvora (32º01’14.424’’S – 52º05’59.095’’W), epiphyton attached to Bolboschoenus maritimus L., sample collected by D. Talgatti and L. Donadel, February 18, 2011. Circled specimen on slide 6611 ( HAS — Museu de Ciências Naturais - Fundação Zoobotânica do Rio Grande do Sul, Porto Alegre, Brazil). Figures 2 and 8 View FIGURES 2–13 correspond to the holotype specimen. GoogleMaps

Isotype: — BRAZIL. Rio Grande do Sul State,Rio Grande city,Ilha da Pólvora(32º01’14.424’’S – 52º05’59.095’’W), epiphyton attached to Bolboschoenus maritimus L., sample collected by D. Talgatti and L. Donadel, February 18, 2011. Circled specimen on slide 78330 ( UPCB - Herbarium of the Universidade Federal do Paraná, Curitiba, Brazil).

Etymology: the epithet “ confusa ”, which means confusing or unclear, was attributed due to the difficulty to define the species identity and the former misidentification as Tryblionella debilis .

Occurrence in the sites: Tryblionella confusa was observed in epiphyton and micrphytobenthos both in winter and summer.

L

Nationaal Herbarium Nederland, Leiden University branch

HAS

Fundação Zoobotânica do Rio Grande do Sul

UPCB

Universidade Federal do Paraná

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