Decussiphycus Guiry & K.Gandhi, 2019

Holotype species: Decussiphycus placenta (Ehrenberg) Guiry & Gandhi

Original publication and holotype designation: Guiry, M.D. & Gandhi, K. (2019). Decussiphycus gen. nov.: a validation of "Decussata" (R.M.Patrick) Lange-Bertalot (Mastogloiaceae, Bacillariophyta). Notulae Algarum 94: 1-2, no fig.

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Description: Cells living solitarily, mostly observed in valve view since in girdle view narrowly rectangular and under light microscopy with or without poor diagnostic significance. Valves broadly elliptic or linear tapering to the cuneate obtusely to broadly rounded or rostrate ends. Valve face flat, valve mantle narrow. Central raphe system generally as in Navicula but modified in detail, less complicated. Valve outside: Central raphe endings expanded to deflected drop-like central pores. Terminal fissures at both poles asymmetrically overlapped by a silica fold. Areolae with foramina circular in shape outside, arranged essentially by three systems of striae, which cross each other in angles of 60-80° forming a regular quincunx pattern. Valve inside: Alveoli and areolae pattern similar as outside. Internal raphe fissure running straight in a distinct raphe sternum, ending in larger helictoglossae at the poles and much smaller though somewhat helictoglossa-like silica accumulations at the central nodule. Oblique costae of the quincunx system at least in the central parts with a moderately higher relief than the transapical costae (modified from Lange-Bertalot 2000: 670).

Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 2024-03-08 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 masculine.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=52670

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 08 March 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 March 2024

 
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