Ichthyodontum A.M.Scott & G.W.Prescott, 1956: 105
Holotype species: Ichthyodontum sachlanii A.M.Scott & Prescott
Original publication and holotype designation:Scott, A.M. & Prescott, G.W. (1956). Notes on Indonesian freshwater algae, 2. Ichthyodontum, a new desmid genus from Sumatra. Reinwardtia 4: 105-112.
Taxonomic status: currently recognized as a distinct genus.
Description: Cells medium sized (132-150 um long), solitary, elongate-cylindric, with length 6-7 times width. Semicells straight or curved, slightly broader at base, truncate at apex. Morphology of semicell apices commonly differs on same cell, although two different types of cells, each having similar apical morphology on the two semicells, known to occur. One apical form ( fishtail ) with prominent median notch and short, axially directed spine on each apical angle; other apical form with shallow median depression and short, laterally directed spine on each apical angle. Semicells with fishtail apex strongly curved, whereas semicells with second apical type almost straight. A pair of large, horizontally disposed mucilage pores present just below apical notch or depression. Semicell base slightly oval in transverse section with 10 poorly developed, longitudinally oriented folds, each of which extends over isthmus constriction as a broad, blunt, thick-walled tooth. These basal teeth interdigitate (but do not interlock) with similar teeth on base of other semicell. Chloroplast morphology uncertain, but probably a plate or ribbon with axial row of 5-6 pyrenoids. Asexual reproduction not studied but cell division and new semicell morphogenesis typical of Cosmarium-type desmids assumed (see Cosmarium). At type locality, 88 % of cells were dichotypical (semicells dissimilar); this predominance of asymmetric cells must result from differing morphogenetic pattern following cytokinesis. Sexual reproduction unknown. Ichthyodontium occurs in Sumatra and Northern Australia. Type locality a swamp in southern Sumatra, pH ca. 6.0; in plankton sample and among periphyton squeezed from aquatic vascular plants.
NCBI Nucleotide Sequences
Numbers of names and species: There is only one species or infraspecific name in the database at present, which has been flagged as currently accepted taxonomically.
Names: ('C' indicates a name that is currently 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):
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.
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43535
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 May 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:6863