Medlinella Frankovich, M.P.Ashworth & M.J.Sullivan, 2016

Holotype species: Medlinella amphoroidea Frankovich, Ashworth & M.J. Sullivan

Original publication and holotype designation: Fankovich, T.A, Ashworth, M.P., Sullivan, M.J., Veselá, J. & Stacy, N.I. (2016). Medlinella amphoroidea gen. et sp. nov. (Bacillariophyta) from the neck skin of Loggerhead sea turtles (Caretta caretta). Phytotaxa 272(2): 101-114, 32 figs.

Description: Frustules are rectangular in girdle view with bluntly rounded ends and porose girdle copulae. Septa are evident on the copulae of whole frustules in girdle view. Septa are also evident in valve view when copulae remain attached to valves. Valves are isopolar and semi-lanceolate with a convex dorsal margin and a slightly concave ventral margin inflated in the middle. The valve face is strongly asymmetric around a narrow axial area, superficially resembling the genus Amphora with distinct dorsal and ventral striae. The striae are composed of circular to transapically elongated areolae that are partially occluded by volae. Apical pore fields are absent. The raphe-sternum is eccentric and displaced towards the ventral margin. The raphe is generally straight to slightly arched. The external proximal raphe ends are spathulate, weakly deflected towards the ventral margin, and terminate where the fascia extends towards the valve margins. The external distal raphe ends are angularly hooked towards the ventral margin with some variation in the angularity of the bends. Small slightly thickened hyaline areas on the primary side of the valves are located near the valve apices adjacent to the distal raphe ends. Internally, the raphe is located on a slightly raised and thickened sternum. The internal proximal raphe ends are straight, simple, closely spaced, and partially obscured by a pair of small knob-like to flap-shaped structures present at the raphe ends. The internal distal raphe ends are straight and terminate on weakly developed helictoglossae. Pseudosepta are absent. The cingulum is composed of many bands (up to 12 observed) that are open at one end. The bands of the cingulum are differentiated into three types: the valvocopulae that have septa, the second copulae that have septa at the opposite pole, and additional abvalvarly located copulae that have shallow, or partially developed septa. The valvocopula is flanged inward on the pars interior where it attaches to the valve. The flange is expanded as a large tab located in the middle on the dorsal side where it aligns with dorsal side of the internal central area of the valve. The valvocopula septum is located on the pars exterior.

Information contributed by: Original description, slightly modified.. The most recent alteration to this page was made on 2017-01-22 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=52111

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 22 January 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 March 2024

 
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