Neodenticula Akiba & Yanagisawa, 1986
Holotype species: Neodenticula kamtschatica (Zabelina) Akiba & Yanagisawa
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Hasle, G.R. & Syvertsen, E.E. (1996). Marine diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 5-385. San Diego: Academic Press.
This is a genus of fossil species, or a genus with a fossil type species, or a genus the type species of which was originally described as a fossil.
Description: Cells growing in short chains. Frustules rectangular in girdle view. Valves short, linear to linear elliptic, with bluntly rounded apices. Transapical striae fine composed of puncta (ca. 30 puncta in 10 _m) in more or less parallel rows with quincunx arrangement. Mantle striae usually more regular, consisting of several rows of puncta in quincunx. Striae separated by costae which are flat on the valve exterior and thickened on the interior; at intervals of 1-5, costae thicker and extend deeper into valve interior as pseudosepta; pseudosepta may extend into girdle region of frustule and may be thickened and flared at each side of valve to produce a marginal, crescent-shaped buttress. Raphe marginal, lying at boundary of valve face and mantle. Raphe continuous, slightly curved at each apex; raphe systems of frustule on opposite margins. Inner raphe system fibulate with fibulae corresponding to costae, each costa branching at margin to form 2 fibulae. A longitudinal costa runs parallel to the raphe on inner surface of valve, forming part of the fibulating system. Cingulum consists of one copula and 1-3 pleurae. Copula closed or with a slit, hyaline or with a row of puncta. If thickened pseudosepta present, copula has arches corresponding to the flared ends of the pseudoseptum, often partially fused to them, thus giving the impression of septa. Pleurae with a slit, smooth. One living species (N. seminae), several fossil forms. Differs from Crucidenticula and Denticulopsis in having very fine puncta, a continuous raphe and branching transapical costae at the raphe-bearing margin, and in lacking marginal costae. Differs from Denticula in having a marginal raphe system, extremely thickened pseudosepta and lacking a keel. Differs from Nitzschia in possessing multiseriate striae and pseudosepta, and in lacking a keel. Most similar to Fragilariopsis from which it differs by the possession of pseudosepta. Marine planktonic, most common in North Pacific but occasionally found in tropical zones of all oceans.
Information contributed by: C. Sancetta. The most recent alteration to this page was made on 5 Mar 2005 by M.D. Guiry.
Numbers of names and species: There are 3 species names in the database at present, of which 3 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
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=45883
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 12 August 2020.