Welcome to the Diatom Image Database! The Periphyton Group at Florida International University created and maintains the Diatom Image Database, which includes over 980 diatom taxa found in the greater Everglades region of south Florida. Please send questions or comments about the Diatom Image Database to Franco Tobias .
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(W. Smith) Round & Bukhtiyarova
Patrick, R. & Reimer, C. W (1966). The Diatoms of the United States I. Monographs of the Academy of Natural Sciences of Philadelphia. Pennsylvania. pp. 251-252; 286-287 [pl.16:3-4]
Achnanthidium lineare W. Sm. 1855; Achnanthes linearis (W. Sm.) Grun. in Cl. & Grun. 1880
Valve is linear or slightly linear-elliptical with broad, obtusely rounded ends that sometimes appear as broad and subrostrate; raphe valve has a narrow, linear axial area that tapers slightly at the valve ends and leads to a (usually) narrow and stauroid central area (this area varies in shape depending on the length of the central striae); raphe is filiform, with proximal ends that do not protrude into the central area, and indistinct (but apparently straight) distal ends; slightly radiate striae are not noticeably punctate or lineate; pseudoraphe valve has a narrow, linear pseudoraphe that leads to a small, linear elliptical space (if any); striae are as on raphe valve; length is 10-20µm, breadth is 2.5-3.5µm; striae count is ~24-26 in 10µm at the centre, becoming ~28-29 in 10µm at the ends (RV), and 23-26 in 10µm at the centre, becoming 28-29 in 10µm at the ends (PRV); Round & Bukhtiyarova (1996) designates Rossithidium as a new genus, combined with lineare as nov. comb.; the description is as above, but they also describe the new genus as having linear to linear-lanceolate with rounded apices, and a narrow sternum on both valves; striae are unbroken in the centre in rapheless valves, but continuous, slightly separated or with central stauros on raphid valve; raphe is straight with slightly swollen central ends and deflected terminal ends; length is 8-40µm, breadth is 3-6µm; striae count is ~20-30 in 10µm
some specimens recorded are wider than as described