7/30/2019 Planothidium lanceolata
1/2
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Planothidium lanceolata (Brb.) Lange-Bert.(1999)
Raphe valve view Brightfield possibly P.frequentissimum
Girdle view phase contrast
Description
Elliptical to elliptic-lanceolate valve outline with broadly rounded or rostrate (occasionallysub-capitate) ends. The valve is flexed in girdle view. Both valves have radiate striaethroughout with a narrow linear or lanceolate axial area. The rapheless valve has a distinctlyone-sided thickening at the centre, which may appear horseshoe shaped, but which lacks adistinct outline. The raphe valve has a central area that is rectangular or butterfly shaped,extending for approximately half to threequarters of the valve width. There is a single plate-like chloroplast, which lies underneath the rapheless valve
Character State
If elliptic or elongate, length 6-40 m
If elliptic or elongate, width 4.5-10 m
If striae resolvable, density 10-15 /10m
Shape in valve view Elliptical or elongated
If elliptic or elongate, transapical symmetry Isopolar
If elliptic or elongate, apical symmetry Isobilateral
Raphe Present
If raphe, position Midline of valve face
Habit
Character State
Colonies Solitary cells
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ula.ncl.ac.uk/EADiatomKey/html/index.html7/30/2019 Planothidium lanceolata
2/2
Attachment By valve face plus mucilage
True Rarely True Unknown
Only by Misinterpretation
Don't confuse with:
Planothidium dubium
Rostrate ends clearly differentiated from main body of valve.
Planothidium frequentissimum
Horseshoe-shaped structure clearly differentiated on valve surface.
Synonyms
Achnantheiopsis lanceolata (Brb). Lange-Bert. 1997Achnanthes lanceolata (Brb.) Grunow in Cleve et Grunow 1880
Achnanthidium lanceolata Brb. ex Ktz. 1849Achnanthidium lanceolatum (Brb. ex. Ktz.) Czarnecki 1987
Taxonomic CommentThe taxonomy and nomenclature of the complex of species around P. lanceolatum is veryconfusing, with Krammer and Lange-Bertalot (1991b) splitting 'Achnanthes lanceolata' intoeight subspecies and distributing a further ten varieties between three of these subspecies.They also place five other species within the "sippenkomplex". Populations of cleanedmaterial often show considerable morphological variation, with many individuals havingcharacteristics intermediate between those for particular 'varieties'. For this reason, acautious approach is adopted here until more studies have been made. See also commentsfor Planothidium delicatulum. For accurate identification, both the raphe and rapheless
valves are needed.
Ecological Information
Common in epilithic biofilms and in epiphytic and episammic habitats across a wide range ofconditions. Experience from UK streams is that it tends to favour nutrient-rich conditions,but there are many records from nutrient-poor environments as well. Bearing in mind thecomments on taxonomic difficulties above, it is possible that the broad ecological rangereflects the 'lumping' of several morphologically-similar species.
Water quality indicators:
S V Comments
Other Indices Saprobic Index (Austria) 2.3 2.3 Tolerant of moderate to heavy organic pollution
Saprobicity (Netherlands) 3 -mesosaprobous
Other Information
pH 4 Alkaliphilous (mainly occurring at pH > 7)
Salinity - UK F Freshwater
Salinity - NL 2 Fresh brackish
Comments to: Diatom Key Development Team
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