163,310 species and infraspecific names are in the database, 22,769 images, 62,922 bibliographic items, 478,460 distributional records.

Trinacria Heiberg, 1863

Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Mediophyceae
Subclass Chaetocerotophycidae
Order Hemiaulales
Family Hemiaulaceae

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. Kjøbenhavn: Wilhelm Priors Forlag.
 Download PDF

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.
 Download PDF

Taxonomic status: currently recognized as a distinct genus.

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 pls.

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 7 Dec 2015 by M.D. Guiry.

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.

Numbers of names and species: There are 72 species names in the database at present, as well as 34 infraspecific names. Of the species names, 14 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 16 April 2003 by M.D. Guiry

Verified by: 07 December 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=46377

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 17 September 2021.

SITE © 1996 - 2021 M.D. Guiry. All rights reserved.

Website Design : 249 Design Studio