Lampriscus A.Schmidt, 1882

Holotype species: Lampriscus kittonii A.W.F.Schmidt

Description: Cells forming long, filamentous colonies. In girdle view rectangular with slight valve elevations, which link the cells. Plastids small, discoid, usually lying in cytoplasmic strands. Mainly tropical; epiphytic on marine algae or attached to other submerged objects. Valves with conspicuous pseudocelli which may superimpose a triangular/quadrangular pattern within the circular outline of the valve, or impose an overall angularity on the valve, making it triangular, quadrangular or multiangular. Striae radiate from the centre and continue without a break down the deep valve mantle. Areolae elliptical, occluded by rotae, occasional simple pores present. Pseudocelli lying on slight elevations; separated into inner and outer portions by a circular hyaline rim located towards the inner margin of the pseudocellus, which may be plain or bear small spines and an additional large spine. This unusual structure can appear in the LM as a circular spot with an outer arc. The pores of the pseudocellus are much smaller than the valve areolae and tend to form linear arrays both inside and outside the rim; the orientation of these arrays differs and the external rows have a line of discontinuity at the angle of the valve. Copulae numerous; valvocopula with a slight septum hooking over a slight ridge on the valve. Areolae in straight lines with a simple rotae; the pegs of these rotae may be at right angles to those on the adjacent mantle.

The most recent alteration to this page was made on 2015-12-07 by M.D. Guiry.

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

Most recent taxonomic treatment adopted: Nikolaev, V.A., Kociolek, J.P., Fourtanier, E., Barron, J.A. & Harwood, D.M. (2001). Late Cretaceous diatoms (Bacillariophyceae) from the Marca Shale member of the Moreno Formation, California. Occasional Papers of the California Academy of Sciences 152: 1-119, 39 plates.

Comments: The diatoms incuded here were originally placed in Triceratium, removed to Biddulphia, and then to Lampriscus. In Hustedt (1927-66) and other texts the principal species is 'Triceratium shadboltianum'; Hustedt discusses some of the problems associated with this form. Species concepts in this genus still require detailed study and some other biddulphioid taxa may have to be transfered into it. We are not certain of its taxonomic position; the interlocking of the valve and valvocopula is reminiscent of Isthmia but the spines on the pseudocellus suggest a link with the hemiauloid series. All Schmidt's (1874-1959) illustrations are from the Pacific or Caribbean and ours were collected in Hawaii and Queensland. Navarro (1981) also records the genus from Puerto Rico.

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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.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 07 December 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 March 2024

 
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