Trieres mobiliensis Ashworth and E. C. Theriot
Creators: name: Sims, Pat A.
name: Williams, David M.
name: Ashworth, Matt
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Chromista
Ochrophyta
Bacillariophyceae
Triceratiales
Triceratiaceae
Trieres
Trieres mobiliensis

description: Trieres mobiliensis (Bailey) Ashworth and E.C. Theriot (Figs 1–7)   
 Basionym:— Odontella mobiliensis Bailey (1851: 6) = ?? Zygoceros mobiliensis Bailey (1851: 40, pl. 2, figs 34, 35)   
 Synonyms:— Denticella mobiliensis (Bailey) Ehrenberg (1853: 256) Zygoceros mobiliensis (Bailey) Ralfs in Pritchard (1861: 850, pl. 6, fig. 11) Biddulphia mobiliensis (Bailey) Grunow in Van Heurck (1882: pl. 101, figs 4–6) Odontella mobiliensis (Bailey) Grunow (1884: 58), invalid   
 Type:— “… Mobile Bay…”, “Savannah, GA [Georgia]”. In the text, Bailey (1851: 4, footnote) writes that those species marked with a star are new and will be described later. Odontella mobilensis Bailey (1851: 6) is so marked but is described later under the name ‘ Zygozeros [sic] (Denticella ?) ’ mobilensis instead of Odontella (Bailey 1851: 40). In the description of ‘ Zygozeros [sic] (Denticella ?) ’ mobilensis Bailey writes “…from Mobile Bay, and subsequently I have found it at Savannah, Ga, and St. Augustine, Florida ” (Bailey 1851: 41). It thus seems reasonable to assume that the name ‘ Zygozeros [sic] (Denticella ?) ’ mobilensis refers to the earlier Odontella mobilensis. The online catalogue refers to “ Zygoceros spp. Outside Mobile Bay, inside of Mobile Point, Alabama; 8 fathoms; J. W. Bailey Coll. 883”, which may be syntype material (http://www2.huh.harvard.edu/diatom/baileycat.htm).   
Frustules in girdle view rectangular with narrow tubular elevations at apices and two long, hollow spines lying between. Apical axis 45–200μm, areolae 14–16 in 10 μm (Hendey 1964, Hasle & Syvertsen 1996). Valve face lanceolate, sinuous, bordered by crenulated marginal ridge separating valve face from expanded mantle; mantle with produced apices (Figs 1, 2, 6). Areolae loculate with internal foramina, on mantle and valve face in bi- and tri-seriate rows of fine pores between hyaline rows, interrupted by small spines, those on valve face in transapical rows bordering central annulus (Figs 3–4). Annulus with hyaline margin, interior with numerous poroids surrounding hyaline circular areas (Fig. 5). Rimoportulae 2, opening externally through long tubular spine, with hyaline surround (Fig. 3), positioned diagonally and sub-marginally within valve face (Figs 1, 2, 6).  
 Observations:— Lavigne et al. (2016) provide images of the living cell having ‘many, small discoid chloroplasts and a central nucleus’ (Lavigne et al. 2016: figs 66–71). For further details see Ashworth et al. (2013: fig. 4a, d) and Lavigne et al. 2016: 318–320).   
The description above is based on material from “Wunderluss” (locality unknown, ex Brigger colln, BM).
description: Published as part of Sims, Pat A., Williams, David M. & Ashworth, Matt, 2018, Examination of type specimens for the genera Odontella and Zygoceros (Bacillariophyceae) with evidence for the new family Odontellaceae and a description of three new genera, pp. 1-56 in Phytotaxa 382 (1) on page 6, DOI: 10.11646/phytotaxa.382.1.1, http://zenodo.org/record/13724044