Kofoid and Campbell, 1939 emend.
Diagnosis
Lorica cylindrical. Oral and aboral ends sometimes funnel-shaped. Oral end frequently smooth, in some cases with well-defined teeth. Wall usually hyaline; exceptionally with short, numerous striae throughout. The systematics of this genus is chaotic. Turn to the species listed below for illustrations of the most characteristic morphological traits of South Atlantic species. Except for studies with descriptions of new species, no comprehensive work can be recommended for this genus.
Arranged in Subgroup 4B (see the page Ti. 15 Classification scheme based on morphologically similar groups of species).
Species treated (marked with * are dubious species):
*Eutintinnus apertus (Kofoid and Campbell, 1929)
Eutintinnus attenuatus (Kofoid and Campbell, 1929)
Eutintinnus fraknoi (Daday, 1887)
Eutintinnus lusus-undae (Entz Sr., 1885)
Eutintinnus medius (Kofoid and Campbell, 1929)
*Eutintinnus rugosus Kofoid and Campbell, 1939