Xenobennettella Witkowski & Riaux-Gobin, 2022

Holotype species: Xenobennettella coralliensis Witkowski & Riaux-Gobin

Original publication and holotype designation: Witkowski, A., Riaux-Gobin, C., Kryk, A., Plocinski, T., Zglobicka, I. & Kurzydlowski, K. (2022). Xenobennettella coralliensis a new monoraphid diatom genus characterized by the alveolate sternum valve with cavum, observed from coral reef habitats. PeerJ 10(e13977): 1-21, 7 figs, 1 table.

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Description: Frustules narrowly rectangular in girdle view with rounded corners. Valves elliptic to linear-elliptic with obtusely rounded apices. SV generally convex with concave sternum and unilateral central area. Cavum present on internal surface of central area. Transapical striae relatively robust, easily resolvable by LM. Alveolae open internally along valve margin as round foramina. SVVC with short, rectangular fimbriae on each side of foraminae. RV slightly concave with a somewhat elevated margin and raphe system. Valve mantle delicately striated (with pyramidal groups of small areolae). Sternum very narrow, raphe filiform?straight with external central endings approximate and slightly expanded, distal raphe endings (as shown by EM) bent in same direction. Internally, raphe slit opens laterally along elevated sternum with proximal raphe endings bent in opposite directions. RV transapical striae resolvable by LM only along the marginal part of valve. In EM, striae composed of triseriate rows of areolae along valve margin, becoming composed of loosely spread areolae towards raphe. Each stria delineated by a rather robust transapical rib (virgae). Areolae in both SV and RV occluded with hymenes bearing radiate slits. Internally, RV valve margin strongly bent inward, supported by transapical ribs that mark the transapical striae externally. Girdle composed of a few plain copulae.

Origin of description: this description is from the original publication; it may have been modified slightly. The most recent alteration to this page was made on 2023-12-28 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=54055

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 28 December 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 04 December 2024