Columbianum, Verhoeff, 1941

Read, Helen J. & Enghoff, Henrik, 2018, Siphonophoridae from Brazilian Amazonia Part 1 - The genus Columbianum Verhoeff, 1941 (Diplopoda, Siphonophorida), European Journal of Taxonomy 477, pp. 1-23 : 10

Key to species of Columbianum from Amazonia

Note that it would be preferable for the key to include all species of Columbianum , but as some of the published descriptions are poor this would require more comprehensive work which is outside the scope of this study.

1 Large, dark and robust species, body width at least 1.8 mm ................................... C. major sp. nov. – Smaller species, body width less than 1.0 mm ................................................................................. 2

2 With strongly domed head and very narrow rostrum; head and metazonites with tubercles but not appearing rugose; prozonites wider than metazonites; medium sized (body width 0.8–1.2 mm) ...... ........................................................................................................................................ C. nahvalr sp. nov.

– With clear distinction between head and rostrum, but head not strongly domed; very rugose, with abundant tubercles on head and metazonite; prozonites the same width as metazonites or narrower; smaller size (body with 0.59–0.98 mm) .................................................................... C. adisi sp. nov.

See also Table 1 for comparisons between the three species.