Azpeitia M.Peragallo, 1912
Lectotype species: Azpeitia temperi M.Peragallo
Currently accepted name for the type species: Azpeitia antiqua (Pantocseck) P.A.Sims
Original publication:Tempère, J. & Peragallo, H. (1912). Diatomées du Monde Entier, Edition 2, 30 fascicules. Fascicule 20-23. pp. 305-352. Arcachon, Gironde: Chez J. Tempère.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Stoermer, E.F. & Julius, M.L. (2003). Centric Diatoms. In: Freshwater Algae of North America. (Wehr, J.D. & Sheath, R.G. Eds), pp. 559-594. San Diego: Academic Press.
According to CAS, "Two species are included, Azpeitia temperei which carries the formula "n. gen. n. sp." and which is fully described, and Triceratium antiquum Pantocsek which is introduced in the sentence "Le Triceratium antiquum Pant. rentre dans ce genre" (Triceratium antiquum Pantocsek belongs to this genus). Ross in Farr et al. (1979) had considered A. temperei to be the holotype. We believe that it is possible that the reason for the larger treatment given to A. temperei is due to the requirements of valid publication of a new species, and may not consitute an implicit indication of type by Peragallo." - (20 Oct 2011) - M.D. Guiry
Description: Cells discoidal, solitary. A genus of species formerly included in Coscinodiscus but separated on the basis of possessing a central 'nodule'. Plastids not observed. Marine, planktonic; modern species tend to be tropical/subtropical in distribution and many fossil species are recorded, also from areas believed to have been tropical. Valves circular (triangular and multiangular in some fossil forms), flat, with a shallow but distinct valve mantle and often with a conspicuous raised central tube; immediately adjacent to this is a depression, into which the external tube of the sibling valve fits. The tube is the external extension of the central rimoportula. A distinct annulus is present in some fossil species (P.A. Sims, personal communication). Areolae in radiating rows, loculate. The inner openings are round foramina with raised rims, both towards the valve interior and towards the loculus itself; externally there are depressed cribra. The edge of the valve face is modified to form a solid ring of silica, within or below which the rimoportula openings are located. In A. africanus each opening extends into a circumferential slit. The areolae continue beneath the ring and tend to change shape, becoming diamond-shaped, often with one point truncated. Rimoportulae shortly stalked; one central rimoportula and others in a ring around the valve face/mantle junction. Copulae apparently plain.The most recent alteration to this page was made on 20 Oct 2011 by M.D. Guiry.
Comments: The structure of the valve clearly places this genus in the Coscinodiscaceae but the central structure and distinct valve rim make a separate genus preferable. When the remainder of the species referred to Coscinodiscus are examined it is likely that others will be transferred to Aspeitia; we have observed several as yet unidentified species with conspicuous central rimoportulae and complex marginal thickenings. Certainly the common 'Coscinodiscus' nodulifer has to be transferred to Azpeitia and these are illustrated in Figs f-i. 'C.' furcatus also belongs here. Many species are important indicator species in the fossil record (Eocene to Recent). Fryxell et al. (1986) place this genus in the Hemidiscaceae, since some of the fossil species have a pseudonodulus.
Numbers of names and species: There are 27 species names in the database at present, as well as 5 infraspecific names. Of the species names, 23 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: 20 October 2011 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=45157
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 23 October 2021.