Gomphonema angustatum var. obtusatum has a more clavate shape. Gomphonema parvulum has a more rhombic-lanceolate valve shape and more rostrate apices. Gomphonema micropus may appear very similar to G. sarcophagus, but the areolae along the axial area are not expanded in G. micropus. The valves of G. micropus are also more elliptic-lanceolate. It needs to be determined if G.angustatum is the fine striae form of G. sarcophagus, as these taxa may be indistinguishable.

LM scalebar = 10 µm
G Sarcophagus 111 G Sarcophagus 112 G Sarcophagus 116 G Sarcophagus 113 G Sarcophagus 117 G Sarcophagus 114 G Sarcophagus 115
Length Range
27-38 µm
Width Range
5-7 µm
Striae in 10 µm
Coarse valve: 6-8, Fine valve: 11-14

Also compare to

Gomphonema angustatum var. obtusatum

(Kütz.) Grunow

Gomphonema parvulum

(Kütz.) Kütz.

Gomphonema micropus