Colactis

Colactis species can be distinguished from other Tynommatidae genera by characteristics of the gonopods (male reproductive appendages), which are the primary diagnostic features for Callipodida classification. The subfamily Colactidinae placement indicates specific gonopod structural arrangements that separate it from other tynommatid subfamilies. Detailed identification requires examination of these specialized structures.

Western North America. The genus occurs in regions where Tynommatidae millipedes are found, primarily in the western United States and adjacent areas.

As soil-dwelling millipedes, species in this genus likely contribute to decomposition of organic matter and nutrient cycling in forest floor and soil ecosystems. This role is inferred from the general ecology of the order Callipodida, though specific studies on Colactis are not documented.

• TynommaAlso in family Tynommatidae; distinguished by gonopod morphology and subfamily placement (Tynommatinae vs. Colactidinae)
• Other Callipodida generaDistinguished by family-level characteristics of Tynommatidae, particularly gonopod structure and body form

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life