Holotype species: Eucampia zodiacus Ehrenberg
Original publication and holotype designation: Ehrenberg [C.G.] (1839). Über jetzt wirklich noch zahlreich lebende Thier-Arten der Kreideformation der Erde. Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königl. Preuß. Akademie der Wissenschaften zu Berlin 1839: 152-159.
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: -119, 39 pls.
Hemiaulaceae [ Eucampia groenlandica] (Balzano et al., 2017: 176, table 1 ). - (13 Apr 2017) - Wendy Guiry
Description: Cells interlocking by two apical elevations to form chains, often curved in spirals due to slightly unequal development of the valves and girdle. Plastids many, discoid. A common marine planktonic genus of only 5 species (VanLandingham, 1969). Valve elliptical to linear. Rows of large areolae radiate from a central annulus within which a rimoportula and some areolae are located. The vela are complex cribra, resembling those in Achnanthes and Isthmia. Apical elevations flattened, with rows of small pores separated by ridges which may or may not cross the central area; this structure is termed an ocellus and certainly functions as such, but its structure is rather unlike that of the ocelli in, for example, the Eupodiscaceae; it does, however, resemble that of Cerataulina. Simple pores occur in the valve framework particularly where new rows are intercalated. Internally the valve is without any special differentiation except that the single central rimoportula protrudes; according to Ross, Sims & Hasle (1977), there is slight development of internal costae. Copulae numerous, areolate, split and ligulate. The areolae are smaller and with more regular pores than on the valves. Resting spores are formed inside vegetative cells and according to Hoban et al. (1980), the first valve has ocelli and coarser valves, while the second has pointed processes but no ocellus. These spores (of E. balaustium) have been described in the literature as separate species of Eucampia. See also Steyaert & Bailleux (1975a, b) who also report that valves at the ends of filaments do not have ocelli - these may therefore be separation valves.The most recent alteration to this page was made on 31 Jan 2020 by M.D. Guiry.
Comments: This genus is very close to Climacodium and Hemiaulus but there are no spines at the apices of the elevations as in Hemiaulus and a ridged ocellus is prominent as in Eucampiua but not in Hemiaulus. Ross et al. (1977) discuss the relationships in more detail and report that E. balaustium is congeneric with the type species E. zodiacus. Syvertsen & Hasle (1983) give a detailed account of Eucampia with which the genus Muelleria is synonymous.
Numbers of names and species: There are 15 species names in the database at present, as well as 12 infraspecific names. Of the species names, 5 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: 23 April 2002 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=44394
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 11 April 2021.