Key to species of Idanthyrsus Kinberg, 1867 from the Grand Caribbean

1. Outer paleae slightly curved with 20–30 pairs of long and straight lateral denticles, nuchal hooks with sharp tip........................................................................ I. bastidai n. sp. Turpialito, Cumaná, Venezuela.

– Outer paleae distally curved with 10–14 pairs of short and slightly curved lateral denticles, nuchal hooks with blunt tip................................................................... I. mikeli n. sp. Turpialito, Cumaná, Venezuela.