Urceolus Mereschkowsky, 1877 (ref. ID; 4950) or 1879 (ref. ID; 4921) reported year? (ref. ID; 1618)

Synonym Phialonema Stein (ref. ID; 1618); Urceolopsis Stokes, 1887 (ref. ID; 4950)

[ref. ID; 1618]
Body colorless; plastic; flask-shaped; striated; a funnel-like neck; posterior region stout; a single flagellum protrudes from funnel and reaches inward the posterior third of body; fresh or salt water. (ref. ID; 1618)

Urceolus cyclostomus (Stein) (ref. ID; 1618) or (Stein) Mereschkowsky (ref. ID; 3517, 4950)
Syn; Phialonema cyclostomum Stein (ref. ID; 4950)
Description; In fresh water. (ref. ID; 1618)
Measurements; 25-50 um long. (ref. ID; 1618)
Urceolus sabulosus (Stokes) (ref. ID; 1618, 4950)
Syn; Urceolopsis sabulosa Stokes (ref. ID; 4950)
Description; Spindle-form; covered with minute sand-grains; fresh water. (ref. ID; 1618)
Measurements; About 58 um long. (ref. ID; 1618)