Fragilaria joachimii Kahlert, 2019

De, Bart Van, Vijver, Mertens, Adrienne & Ector, Luc, 2020, Analysis of the type material of Synedra deformis W. Sm. and Synedra vaucheriae var. deformis Grunow (Fragilariaceae, Bacillariophyta), Cryptogamie, Algologie 20 (13), pp. 137-149 : 144

publication ID

https://doi.org/ 10.5252/cryptogamie-algologie2020v41a13

DOI

https://doi.org/10.5281/zenodo.7819171

persistent identifier

https://treatment.plazi.org/id/03CDC308-9914-1333-FF75-FD0EFD392418

treatment provided by

Felipe

scientific name

Fragilaria joachimii Kahlert
status

 

Fragilaria joachimii Kahlert , type population

( Fig. 4 View FIG )

Basionym: Fragilaria joachimii Kahlert in Kahlert et al., Journal of Phycology 55: 963, fig. 5 (2019).

MORPHOLOGY

LM ( Fig. 4 View FIG A-T)

Frustules in girdle view rectangular, in culture linked forming long chains of up to several tens of cells ( Fig. 4 View FIG S-T). Valves linear with parallel margins and broadly rounded, protracted, rostrate, never capitate apices. Shoulders poorly developed, gradually tapering into the apices. Centrally, valves often slightly inflated. Valve dimensions (n = 40): valve length 14-28 µm, valve width 3.5-4.5 µm (length 5-31 µm, width 3.3-4.6 µm in the protologue, Kahlert et al. 2019). Axial area very narrow linear, not widening towards the central area. Central area large, forming a broad, often asymmetrical, inflated fascia, due to several shortened striae on one side. Striae parallel throughout, becoming weakly radiate near the apices, 14-16 in 10 µm, often irregularly spaced. Areolae not discernible in LM.

SEM ( Fig. 4 View FIG U-X)

Girdle composed of several open, perforated copulae ( Fig. 4 View FIG U-V). Frustules not linked using linking spines but by mucus ( Fig. 4U View FIG , arrows). Large, irregularly shaped mantle plaques present on the mantle edge ( Fig. 4V View FIG ). Mantle striae continuing from the valve face till halfway or 1/3 of the mantle edge ( Fig. 4V View FIG ). Striae uniseriate, composed of small, rimmed, rounded areolae ( Fig. 4 View FIG W-X), individually covered by external hymenes ( Fig. 4X View FIG ). Virgae between the striae weakly raised ( Fig. 4W View FIG ). One rimoportula present at one apex, in line with the last stria at the apex ( Fig. 4X View FIG ). Apical pore field present at both apices ( Fig. 4X View FIG ). Small spines and granules scattered throughout the entire valve face and mantle ( Fig. 4 View FIG W-X).

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