Eoseira A.P.Wolfe & M.B.Edlund, 2005

Holotype species: Eoseira wilsonii A.P.Wolfe & M.B.Edlund

Original publication and holotype designation: Wolfe, A.P. & Edlund, M.B. (2005). Taxonomy, phylogeny and paleoecology of Eoseira wilsonii gen. et sp. nov., a Middle Eocene diatom (Bacillariophyceae: Aulacoseiraceae) from lake sediments at Horsefly, British Columbia, Canada. Canadian Journal of Earth Sciences 42: 243-257.

Fossil: This is a genus of fossil species, or a genus with a fossil type species, or a genus the type species of which was originally described as a fossil.

Description: Frustules and valves cylindrical, rectangular in girdle view, circular in valve view. Frustules joined valve face to valve face in filaments by broad, flattened marginal spathulate linking spines with apiculate ends. Terminal valves of filaments with broad, flattened lanceolate to broadly ovate separation spines. Spines located circumferentially along the valve face-mantle junction; spines seated on neighboring valves in broad, flat grooves shaped identically to its corresponding separation or linking spine. Areolae on mantle with small round external openings, arranged in straight, parallel pervalvar striae. Single or paired interstriae do not form the linking and separation spines as in the genus Aulacoseira. Rather, spines on Eoseira show no morphogenetic or geometric relation to mantle striae and interstriae. Areolae on mantle and valve face occluded by internal vela. Valves with welldeveloped annular pseudoseptum or Ringleiste. Valves bordered by a smooth, non-areolate collum. Multiple sessile rimoportulae widely scattered on internal mantle wall from the advalvar edge of Ringleiste to the junction of valve face and mantle (Abfallzone). Cingulum comprises numerous open ligulate copulae with fine poroids aligned in pervalvar rows.

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 2018-03-12 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: Usoltseva, M., Kociolek, J.P. & Khursevich, G. (2013). Three new species of Alveolophora (Aulacoseiraceae, Bacillariophyceae) from Miocene deposits in western North America. Phycologia 52(1): 109-117.

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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=51464

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 12 March 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024