163,310 species and infraspecific names are in the database, 22,769 images, 62,922 bibliographic items, 478,460 distributional records.

Pseudogomphonema Medlin, 1986

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Bacillariophyceae
Subclass Bacillariophycidae
Order Naviculales
Suborder Naviculineae
Family Naviculaceae

Holotype species: Pseudogomphonema kamtschaticum (Grunow) Medlin

Original publication and holotype designation: Medlin, L.K. & Round, F.E. (1986). Taxonomic studies of marine gomphonemoid diatoms. Diatom Research 1(2): 205-225, 100 figs, 1 table.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: 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.

Description: Cells solitary, attached by a short stalk or pad, heteropolar and usually lying in girdle view. Valves linear to linear-lanceolate with broadly rounded or slightly rostrate head poles and more acutely rounded foot poles. Valve face flat in centre or curving uniformly into relatively deep mantles in some species. Striae uniseriate containing apically elongate slit-like pores, occluded by hymenes and opening internally into grooves between strongly developed transapical ribs. Pseudoseptum usually present at the foot pole as a bridge across the valve, which is fused to the helictoglossa leaving an apical chamber that opens to the outside by a row of a number of unoccluded slits; there may also be a chamber at the head pole. Raphe-sternum central, more strongly developed internally on the primary side (i.e. that side of the raphe system that is laid down first, Mann 1984a). Thus, the raphe opens laterally along its length but becomes vertical at the apices and valve centre. Raphe system associated with the head pole only slightly shorter than that at the foot pole. External central raphe endings e*anded, pore-like; internal endings straight, simple, closer together than the external endings. Terminal fissures usually absent at the head pole, hooked to one side at the foot pole. Cingulum containing four open, nonporous bands, the first and third of which are long bands extending nearly the whole length of the valve; the second and fourth are reduced to small segments (ligulae) lying at the foot pole. The partes interiores of bands 2 and 4 are slightly septate to clasp the pseudoseptum at the foot pole.

Origin of description: this description is from the original publication; it may have been modified slightly.

Comments: Round, Crawford & Mann (1990: 128) record this family as being a member of the Suborder Naviculineae.

Numbers of names and species: There are 6 species names in the database at present, as well as 1 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.

References
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.

Scott, F.J. & Thomas, D.P. (2005). Diatoms. In: Antarctic marine protists. (Scott, F.J. & Marchant, H.J. Eds), pp. 13-201. Canberra & Hobart: Australian Biological Resources Study; Australian Antarctic Division.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

Contributors
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

Verified by: 12 September 2016 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=46105

Citing AlgaeBase
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 17 September 2021.

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