Allonitzschia A.Mann, 1925
Holotype species: Allonitzschia munifica A.Mann
Original publication and holotype designation: Mann, A. (1925). Marine diatoms of the Philippine Islands. Bulletin United States National Museum 100(6, part 1): 1-182, 39 pls.
Description: Valve elongated, bilaterally unsymmetrical, tapering to the slightly curved apices, Nitzschia-like; its dorsal side straight, ornamented with a closely set row or chain of polygonal divisions forming a heavy border, slightly over one-half the width of the valve and proportionally decreasing in size toward the gracefully tapered apices; ventral side slightly convex, its margin gently undulate, the undulations corresponding to barely perceptible elevations and depressions or waves of the valve surface running across the valve and corresponding in number to the polygonal divisions of the dorsal border; the whole valve, including this border, covered with fine transverse rows of beading. Side (girdle) view narrow rectangular, the lines or costae of the polygonal dorsal border of the valve here appearing as septal thickenings, thereby having the appearance of crossbars, like those seen in girdle views of Denticula lauta, Epithemia zebra, etc. [Original description]. Girdle view narrow, rectangular; fibulae appearing as septal thickenings. Valves with hantzschioid symmetry, i. e. valves asymmetrical with respect to the apical plane, dorsal side straight and ventral side slightly convex. Keeled raphe eccentrically placed on the valve, both raphes on dorsal side. Fibulae extend slightly over one half of valve face. Growth habit not known. Girdle view narrow, rectangular; fibulae appearing as septal thickenings. Valves with hantzschioid symmetry, i. e. valves asymmetrical with respect to the apical plane, dorsal side straight and ventral side slightly convex. Keeled raphe eccentrically placed on the valve, both raphes on dorsal side. Fibulae extend slightly over one half of valve face.
Information contributed by: M.C. Amspoker. The most recent alteration to this page was made on 2021-07-14 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.
Most recent taxonomic treatment adopted: Fourtanier, E.J. & Kociolek, J.P. (2009). Catalogue of diatom names: Part II: Abas through Bruniopsis. Occasional Papers of the California Academy of Sciences 156(II): 1-231, 2 figs, 1 table.
Comments: Described from marine dredgings collected from Sulu Islands, the Philippines. Further study of this rarely reported taxon may warrant its inclusion within the genus Hantzschia.
Verification of Data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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=46683
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 14 July 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 03 June 2023