Skeletonema, 1865, nom. et typ. cons.
Holotype species: Skeletonema costatum (Greville) Cleve
Original publication and holotype designation: Greville, R.K. (1865). Descriptions of new and rare diatoms. Series XVI . Transactions of the Microscopical Society, New Series, London 13: 43-57, pls V, VI.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as neuter.
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.
From CAS: "Type by monotypy. Sometimes misspelled Sceletonema. Skeletonema was established by Greville (1865) for a single species, S. barbadense. Several species of Skeletonema have since then been described, both fossil and living. A proposal to conserve Skeletonema with a new conserved type in order to maintain its use for the group of recent species congeneric with the living species S. costatum (see Ross et al. in Taxon 45:315. 1996) has been recommended by the Committee for Algae (P. Compère, pers. com., 1998). Skeletonemopsis was created by Sims 1994 to accomodate Skeletonema barbadense Greville and other fossil "Skeletonema" species." - (24 Apr 2010) - M.D. Guiry
Description: Emended by Sarno & Zingone (Sarno et al., 2005: 154-156, fig. 1, A-N). Cells joined by long marginal processes to form filaments, which appear in the light microscope like short beads joined by numerous fine threads. Plastids disc-like or cup-shaped. Living in the coastal marine plankton. Valves circular; valve face convex to flat; mantles deep. Valves with a prominent network of costae externally, becoming pseudoloculate near the margin. Internally with distinct cribra on the flat or slightly ribbed surface. A single ring of processes occurs around the top of the mantle. These are closely associated with a ring of fultoportulae, the external openings of which are short tubes hidden in the bases of the processes. The processes are semi-circular in cross-section and expand at their apices to form 'knuckles' which interlock with the processes from the adjacent cell; they are sometimes much longer than the cell and can interlock with either one or two processes of the sibling valve. Occasional valves produce flattened spinulose processes and on these there is also a central rimoportula, with a tubular external opening. Occasional rimoportulae also occur around the valve mantle. The internal endings of both the fultoportulae and rimoportulae are very small though typical in form. Girdle composed of a split valvocopula and numerous, finely porous and delicate copulae, each with a distinct pars media. In intact filaments the new sibling valves and processes are covered by the copulae whilst the processes linking old pairs of valves are exposed.The most recent alteration to this page was made on 19 Oct 2015 by M.D. Guiry.
Comments: Occurs in coastal waters throughout the world where it can be an extremely common diatom. Many ecological studies have been made on it and, because it also grows easily and rapidly in culture, it has been used for physiological studies. Several species are reported in various oceanic regions but all these need re-investigation. In addition several fossil species have been described.
Numbers of names and species: There are 24 species names in the database at present, of which 21 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.
Tomas, C.R., Eds (1996). Identifying marine diatoms and dinoflagellates. pp. 1-858. San Diego: Academic Press Inc.
Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The diatoms Biology and morphology of the genera. pp. [i-ix], 1-747. Cambridge: Cambridge University Press.
Sarno, D., Kooistra, W.H.C.F., Medlin, L.K., Percopo, I. & Zingone, A. (2005). Diversity in the genus Skeletonema (Bacillariophyceae): II. An assessment of the taxonomy of S. costatum-like species, with the description of four new species. Journal of Phycology 41: 151-176.
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: 11 April 2002 by M.D. Guiry
Verified by: 19 October 2015 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43754
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 April 2019.