Range and natural history
A 1988 systematic study associated the paludosum form with the Kiamichi, Boggy and Washita systems of Oklahoma. Newly found Washita populations extended the known distribution of the broader orangebelly-darter complex westward and prompted comparison of body proportions, counts and color.
The authors placed those Washita fish with paludosum based on their shared characters. Modern ITIS treats Etheostoma paludosum as a valid species and explicitly lists Etheostoma radiosum paludosum as a synonym. That history is essential when interpreting older river records.
Sources: Variation and systematics of Etheostoma radiosum; Etheostoma paludosum taxonomy
Guide sources
Research reviewed 2026-10-19.
