Orthoporus flavior

Distinguished from Orthoporus ornatus (desert millipede) by the presence of distinct yellow-gold banding; O. ornatus typically exhibits uniform dark coloration or less pronounced patterning. Differs from other southwestern Orthoporus species by banding intensity and distribution. Positive identification requires examination of gonopod morphology in males.

Large cylindrical millipede with prominent yellow or gold banding traversing the dorsal surface against a darker background coloration. Body composed of numerous segments, each bearing two pairs of legs. Adults reach substantial size typical of the genus. The banded pattern distinguishes it from uniformly dark congeners.

Arid and semi-arid regions of the southwestern United States and northern Mexico. Associated with desert and dry grassland ecosystems. Specific microhabitat preferences not documented, though congeners inhabit areas with sufficient organic matter for detritivory.

Southwestern United States (Texas, New Mexico, Arizona) and northern Mexico. Records indicate presence in Middle America with confirmed occurrence in trans-Pecos Texas and adjacent regions.

Exhibits defensive coiling when disturbed, a characteristic behavior of the genus. Slow, deliberate movement typical of large spirostreptid millipedes. Nocturnal activity patterns inferred from congener behavior but not directly documented for this species.

Detritivore; contributes to decomposition of organic matter in arid ecosystems. Specific ecological functions not separately documented from congeners.

Occasionally kept in captivity by millipede enthusiasts. Non-venomous and harmless to humans, though like many millipedes may secrete defensive compounds if severely disturbed. Not a pest species.

• Orthoporus ornatusOverlapping range and similar size; distinguished by uniform dark coloration lacking prominent banding
• Orthoporus punctilligerSympatric in parts of range; requires gonopod examination for definitive separation

• millipede
• diplopod
• desert
• southwestern US
• banded
• detritivore

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