Trinacria Heiberg, 1863

Lectotype species: Trinacria regina Heiberg

Original publication: Heiberg, P.A.C. (1863). Conspectus criticus diatomacearum danicarum. Kritisk oversigt over de danske Diatomeer. pp. 1-135, 6 pls. KjĂžbenhavn: Wilhelm Priors Forlag.

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Type designated in: Boyer, C.S. (1927). Synopsis of North American Diatomaceae, Supplement, Part 2. Naviculatae, Surirellatae. Proceedings of the Academy of Natural Sciences of Philadelphia 79: 229-583.

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Description: Cells tri- (quadr-)angular, attached in chains by the extended apices. A marine, fossil genus occurring in the Early Eocene. Valves tri- (qadr-)angular, elevated at the corners, where short and a longer spine(s) occur and interlock neatly with adjacent cells. Valve face raised in the centre and variously ornamented (e.g. with small spines); ridged along the valve face/mantle junction, the ridges running up the elevations; valve mantle shallow (the internal surface has folds in some species: see Ross, Sims & Hasle, 1977). Areolae radiating from the centre, cribrate; continuing down the valve mantle and becoming smaller up the elevations. At the apices of the elevations and surrounded by the spines, there are a few pores (indistinct in our specimen). Isolated simple pores penetrate the framework of valve face and mantle. Three rimoportulae occur as a central ring and three others occur near the corners; the internal development is slight but the external tubes can be quite long. Ross et al. (1973) figure a pseudocellus on the outer face of the elevation of T. exsculpta. Copulae not known.

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 overall morphology of this genus places it in the Hemiaulaceae (see Ross, Sims & Hasle, 1977), for a detailed discussion and their view that this group should be a subfamily of the Biddulphiaceae). Some of the fossil species have been investigated in great detail by Sims & Ross (1988). We thank P.A. Sims for material for this and the subsequent five genera.

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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 December 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 28 September 2022

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