Diatoms of North AmericaDiatoms of North America
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Compare Craticula johnstoniae

Bahls 2013

Compare

Craticula acidoclinata has unprotracted or subrostrate apices. Craticula cuspidata has narrow apices and a central area with concave sides. Craticula sardiniana has broadly rounded, unprotracted apices.

LM scalebar = 10 µm
Craticula johnstoniae LM1 Craticula johnstoniae LM7 Craticula johnstoniae LM2 Craticula johnstoniae LM3 Craticula johnstoniae LM5 Craticula johnstoniae LM4
Length Range
78-105 µm
Width Range
18.0-19.3 µm
Striae in 10 µm
14 (center) to 17 (apices); 10-15 Heribaudii stage

Craticula acidoclinata

Lange-Bert. and Metzeltin 1996

Cratacid1 Cratacid2 Cratacid3 Cratacid4 Cratacid5 Cratacid6 Cratacid7
Length Range
94-168 µm
Width Range
22-29 µm
Striae in 10 µm
12-14

Craticula cuspidata

(Kütz.) D.G.Mann 1990

C Cuspidata Gray 1 C Cuspidata Gray 5 C Cuspidata Gray 4 C Cuspidata Valve Forms Gray C Cuspidata Gray 3 C Cuspidata Gray 2
Length Range
95-157 µm
Width Range
24-36 µm
Striae in 10 µm
12-14 transverse, 24-26 longitudinal

Craticula sardiniana

Bahls 2013

Craticula sardiniana LM1 Craticula sardiniana LM2 Craticula sardiniana LM3 Craticula sardiniana LM6 Craticula sardiniana LM4 Craticula sardiniana LM5
Length Range
68-113 µm
Width Range
15.6-19.5 µm
Striae in 10 µm
14 (middle) to 18 (ends)

Craticula coloradensis

Edlund, D.R.L.Burge and S.A.Spauld. 2017

Craticula coloradensis LM5 Craticula coloradensis LM4 Craticula coloradensis LM7 Craticula coloradensis LM6 Craticula coloradensis LM3 Craticula coloradensis LM2 Craticula coloradensis LM1
Length Range
101-162 µm
Width Range
22.5-26.7 µm
Striae in 10 µm
transverse striae 11.9-14.3; longitudinal striae 20.0-23.8