Auliscus Ehrenberg, 1843

Holotype species: Auliscus cylindricus Ehrenberg

Original publication and holotype designation: Ehrenberg, C.G. (1843). Beobachtungen des bedeutenden Einflusses unsichtbar kleiner Organismen auf die untern Stromgebeithe, besonders der Elbe, Jahde, Ems und Schelde. 1843: 259-272.

Precise date of publication: November

Description: Cells solitary, circular or elliptical in valve view, rectangular in girdle view with elevations. Probably attached to sand grains in the marine inshore region but rarely recorded in live material. Many fossil species extending back to the Cretaceous. Huistedt (1927-66) comments upon the variability of the valve markings of this genus. Valves with two or three conspicuous ocelli on elevations and a valve face that is ridged or variously moulded. The ocelli have radiating sectored rows of porelli and are surrounded by thick ridges of silica; they are often located slightly oblique to the centre line of elliptical forms and a second axis of markings is situated at right angles to the ocellar (elliptical) axis. Fine and relatively inconspicuous rows of areolae radiate in groups between the ridges. The valves are extremely thick. The outer apertures of the areolae appear unoccluded whilst the inner almost certainly have domed vela. The areolae of the valve mantle form distinct rows and a clear circumferential ridge, sometimes developed into a distinct rim, divides these from the valve face areolae. Internally the ocelli are sunken, with no indication of the circumferential thickenings so obvious on the outside. Rimoportulae appear to be absent in our material; P.A. Sims (personal communication) has fossil material with extremely inconspicuous marginal rimoportulae and Simonsen (1979) also reports their presence in fossil but not modern material. The copulae are split and are coarsely or finely poroid.

The most recent alteration to this page was made on 2015-05-07 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Cox, E.J. (2015). Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae (Diatoms). In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. 13th Ed. Photoautotrophic eukaryotic algae Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Heterokontophyta/Ochrophyta, Chlorarachniophyta/Cercozoa, Euglenophyta/Euglenozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 64-103. Stuttgart: Borntraeger Science Publishers.

Comments: Rattray (1888b) revised the genus but there has been little systematic work since, though many species have been described, most of them fossil. The species of the genus Pseudoauliscus Leudiger-Fortmorel are usually included within Auliscus. The genus is unlikely to be confused with any other and is clearly distinguished by the massive ocelli.

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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 07 May 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 13 April 2024

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