Diatoms of North AmericaDiatoms of North America
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Compare Brachysira chiaruccii

Cantonati, Lange-Bertalot, E.Arnaud, M.Galbiati and É.Soróczki-Pintér 2021

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This taxon was historically associated with B. procera, however upon inspecting the type material of B. microcephala, Van de Vijver et al. (2021) concluded that the type of B. procera belongs within the upper size range of B. microcephala.

Brachysira brebissonii, B. microcephala, and B. confusa are isopolar.

Brachysira ocalanensis has linear valve margins (from center of the valve to the apices)(Shayler and Siver 2004).

Brachysira vitrea has striae that are often not resolved in LM (see Van de Vijver et al. 2023).

Brachysira subtilis has more broadly rounded apices.

Brachysira neoexilis has capitate apices.

LM scalebar = 10 µm
Brachysira chiaruccii 1 SMM 13296b Brachysira chiaruccii 2 SMM 13296b Brachysira chiaruccii 3 SMM 16226b Brachysira chiaruccii 4 SMM 13296b Brachysira chiaruccii 5 SMM 13296b Brachysira chiaruccii 6 SMM 13296b Brachysira chiaruccii 7 SMM 13263b
Length Range
13.1-43.9 µm
Width Range
4.5-6.8 µm
Striae in 10 µm
29-32

Brachysira brebissonii

R.Ross in B.Hartley 1986

Brachysira brebissonii LM7 Brachysira brebissonii LM6 Brachysira brebissonii LM5 Brachysira brebissonii LM4 Brachysira brebissonii LM3 Brachysira brebissonii LM2 Brachysira brebissonii LM1
Length Range
11-36 µm
Width Range
4-8 µm
Striae in 10 µm
26-35

Brachysira microcephala

(Grunow) Compère 1986

Ansp 15991A 13 Na Brachysira microcephala LM5 Brachysira microcephala LM2 Brachysira microcephala LM1 Brachysira microcephala LM4 Brachysira microcephala LM3 Brachysira microcephala LM6
Length Range
17-30 µm
Width Range
3.5-7 µm
Striae in 10 µm
30-36

Brachysira confusa

Van de Vijver, R.L.Albert, B.Kennedy and Kusber 2021

Brachysira confusa LM1 Brachysira confusa LM2 Brachysira confusa LM3 Brachysira confusa LM7 Brachysira confusa LM4 Brachysira confusa LM5 Brachysira confusa LM6
Length Range
14.7-33.4 µm
Width Range
4.9-6.6 µm
Striae in 10 µm
28-29

Brachysira ocalanensis

Shayler and Siver 2004

Brachysira ocalanensis LM1 Brachysira ocalanensis LM2 Brachysira ocalanensis LM3 Brachysira ocalanensis LM4 Brachysira ocalanensis LM5 Brachysira ocalanensis LM6 Brachysira ocalanensis LM7
Length Range
19.0-38.6 µm
Width Range
4.0-5.7 µm
Striae in 10 µm
32-34, more closely spaced towards the apices

Brachysira vitrea

(Grunow) R.Ross in B.Hartley 1986

Brachysira Vitrea 1 Brachysira Vitrea 2 Brachysira Vitrea 3 Brachysira Vitrea 4 Brachysira Vitrea 5 Brachysira Vitrea 6 Brachysira Vitrea 7
Length Range
12.4-25.4 µm
Width Range
4.3-5.9 µm
Striae in 10 µm
32-36

Brachysira subtilis

Potapova, Hamilton and Kopyrina 2014

Brachysira subtile LM1 Brachysira subtile LM2 Brachysira subtile LM3 Brachysira subtile LM4 Brachysira subtile LM5 Brachysira subtile LM6 Brachysira subtile LM7
Length Range
19-30 µm
Width Range
3-4 µm
Striae in 10 µm
32-38

Also compare to

Brachysira neoexilis

Lange-Bert.