Pseudoderbesia eckloniae Huisman & Verbruggen, 2020

Huisman, John M. & Verbruggen, Heroen, 2020, Pseudoderbesia eckloniae, sp. nov. (Bryopsidaceae, Ulvophyceae) from Western Australia, Cryptogamie, Algologie 20 (3), pp. 19-23 : 20

publication ID

https://doi.org/ 10.5252/cryptogamie-algologie2020v41a3

DOI

https://doi.org/10.5281/zenodo.12216071

persistent identifier

https://treatment.plazi.org/id/BD10879F-FF85-FFB4-7C55-FBB926D14237

treatment provided by

Felipe

scientific name

Pseudoderbesia eckloniae Huisman & Verbruggen
status

sp. nov.

Pseudoderbesia eckloniae Huisman & Verbruggen , sp. nov.

( Fig. 1 View FIG )

HOLOTYPE. — PERTH 09134638 About PERTH . Collected at Cape Peron, Western Australia (32°16.18’S, 115°41.178’E), epiphytic on Eckloniaradiata at 2 m depth, 9.I.2019, J. M.Huisman 9.1.19.1A-C (three specimens mounted on sheet) ( Fig. 1B View FIG ). GoogleMaps

PARATYPE. — PERTH 09134646 About PERTH . Loc. id., 30.XII.2018 , J. M.Huisman 30.12.18.

ETYMOLOGY. — The epithet “eckloniae ” refers to the species’ only known host, Ecklonia radiata .

DESCRIPTION

Thallus grass green, forming a velvety layer on the surface of degrading branches of Ecklonia radiata ( Fig. 1A View FIG ), spreading laterally for up to 10 cm, siphonous, with dichotomously branched upright axes arising from a stoloniferous base ( Fig. 1C View FIG ). Stolons terete, 35-50 µm in diameter, attached by elongate, terete rhizoidal siphons. Upright axes dichotomously (rarely trichotomously) branched 4-7 times when mature, dichotomies mostly at similar levels but occasionally unequal, with slight constrictions commonly present at branch bases ( Fig. 1D View FIG ). Upright axes proximally 50 µm in diameter when young, 120-200 µm in diameter when mature; distal branches markedly narrowing, with ultimate branches 12-25 µm in diameter. Chloroplasts numerous, elongate to ovate, each with a single pyrenoid ( Fig. 1E View FIG ). Reproduction not observed.

MOLECULAR ANALYSIS

The rbc L gene of four samples of the new species was sequenced following the procedures of Verbruggen et al. (2009) and submitted to GenBank (MT108929). The four sequences of Pseudoderbesia eckloniae , sp. nov., were identical and only one was included for further analysis. The sequence was aligned with those of Bryopsidineae used in Leliaert et al. (2014) and Lambia antarctica (Skottsberg) Delépine ( Cremen et al. 2019) . A maximum likelihood phylogenetic tree was inferred with RAxML 8.2.10, using a GTR+G+I model and 100 standard bootstraps ( Stamatakis 2014). The phylogenetic tree ( Fig. 2 View FIG ) shows that the genus Pseudoderbesia is related to Lambia Delépine and Bryopsis J.V.Lamouroux , but the exact relationships among these genera is not recovered with sufficient bootstrap support. The divergence between Pseudoderbesia eckloniae , sp. nov., and Pseudoderbesia sp. from Greece is clear in the tree, and the rbc L interspecific divergence between these two Pseudoderbesia species is 3.87%.

J

University of the Witwatersrand

M

Botanische Staatssammlung München

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