Pachycladella P.C., 1970: 943
Holotype species: Pachycladella umbrina (G.M.Smith) P.C.Silva
Original publication and holotype designation:Silva, P.C. (1970). Remarks on algal nomenclature IV. Taxon 19: 941-945.
Taxonomic status: currently recognized as a distinct genus.
Description: Solitary spherical to slightly quadrangular or lobate, microscopic cells not embedded in gelatinous envelope. Cells 3-13 &m diameter, with four (or more) cruciate or tetrahedrally arranged tubular or slightly conical processes. Processes more or less the same length on each cell, 5-120 &m long and 2-4 &m wide at base, translucent to dark brown, with usually a slightly bifurcate or sometimes blunt apex. Processess sometimes distinguished by darker colour than the cell wall. They are structurally non identical to the cell wall and and can be mechanically separated from it. In culture (in P. umbrina only), processes translucent. Details of process formation not yet clarified. Cells uninucleate; single chloroplast cup-shaped and parietal, nearly filling the cell; pyrenoid single and carved with several spoke-like invaginations (in P. umbrina and P. zatoriensis). Asexual reproduction by zoospores. Basal bodies of biflagellate cell at 1 and 7 o'clock positions (clockwise orientation). Sexual reproduction unknown. Pachycladella planktonic in freshwater, one species found on snow, rare but cosmopolitan. Bernardia tetraedriaca Playfair (1918) is probably representative of Pachycladella zatoriensis. P. umbrina and P. zatoriensis investigated by TEM, and microanalysis reveals presence of Fe and Fe and Mn respectively on processes, and not on cell wall. Other taxa rare and require further investigations to confirm status in Pachycladella.
NCBI Nucleotide Sequences
Numbers of names and species: There are 4 species (and infraspecific) names in the database at present, of which 4 have 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):
Pachycladella chodatii (Bern.) Hegewald P
Pachycladella minor (Chudybowa & Chudyba) P.C.Silva C
Pachycladella umbrina (G.M.Smith) P.C.Silva C - type
Pachycladella zatoriensis (Bednarz & Mrozinska-Webb) Komárek C
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=44572
Cite this record as:
Michael 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 13 December 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:6408