The ventral margin of E. yellowstonianum is slightly expanded, as compared to the more expanded ventral margin of E. reimeri. The valves of E. yellowstonianum are narrower compared to E. reimeri. The two species overlap in striae count. Further work may show that E. yellowstonianum and E. reimeri are conspecific.

While there have been a number of reports of E. sinicum from North America, this species has acute apices, a finer striae count (12 in 10 μm) and finer areolae count. The density of areolae within a central, dorsal stria is 7-8 in 5 μm.

LM scalebar = 10 µm
Encyonema yellowstonianum LM2 Encyonema yellowstonianum LM3 Encyonema yellowstonianum LM1
Length Range
39-75 µm
Width Range
17-23 µm
Striae in 10 µm

Encyonema reimeri

S.A.Spauld., Pool and S.Castro 2010

Encyonema reimeri LM1 Encyonema reimeri LM2 Encyonema reimeri LM3 Encyonema reimeri LM4 Encyonema reimeri LM5
Length Range
30-89 µm
Width Range
16-26.5 µm
Striae in 10 µm

Encyonema temperei

Krammer 1997

Encyonema temperei LM1 Encyonema temperei LM2 Encyonema temperei LM3 Encyonema temperei LM4 Encyonema temperei LM5 Encyonema temperei LM6
Length Range
39-78 µm
Width Range
19-25 µm
Striae in 10 µm

Also compare to

Encyonema sinicum