Onomeris underwoodi Cook, 1896

Wesener, Thomas, 2010, Revision of the American Pill Millipedes I: Onomeris and Trichomeris (Diplopoda, Glomerida, Glomeridae), Zootaxa 2725, pp. 28-40: 33

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http://doi.org/ 10.5281/zenodo.199966

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Onomeris underwoodi Cook, 1896


Onomeris underwoodi Cook, 1896 

( Figures 1 –3View FIGURE 1View FIGURE 2View FIGURE 3, 5View FIGURE 5)

O. underwoodi Cook, 1896: 43 

Hoffman 1950: 14; Chamberlin & Hoffman 1958: 12; Hoffman 1999: 18 (list species name).

Material examined: Type material: 1 male lectotype (designated by Dr. R.L. Hoffman),> 120 male and female paratypes ( USNM [ NMNH] 2599). U.S.A., Alabama, Lee County, Auburn.

Other material examined: 2 M, 1 F (FMNH-INS 14133). U.S.A., Mississippi, Harrison County, Harrison Expt. For., coll. D. Beyers & M. Jenks, in black cherry tree hole, 29.iii. 1984; 1 M, (FMNH-INS 56301). U.S.A., Alabama, Jackson County, 5 miles NE Garth, coll. S. Peck, 19.v. 1972; 6 M, 4 F (FMNH-INS 56299). U.S.A., Georgia, Effingham County, Kildare, leg. L. Hubricht, 03.x. 1959, det. Hoffman; 1 M, 1 F (FMNH-INS 56303). U.S.A., Alabama, Shelby County, Oak Mountain State Park, coll. H. S. Steenes, 16.x. 1960; 13 M, 6 F ( VMNH). U.S.A., Tennessee, Polk County, Hiawassee River bluff, 2.7 miles NW Reliance, coll. C. Hubricht, 14.V. 1961; 2 M, 2 F ( VMNH). U.S.A., Tennessee, Blount County, Chilhowee Mountain, Foothills Parkway, 3.5 miles SW Walland, coll. C. Hubricht, 23.IX. 1967.

Locality from the literature: N. to Kentucky ( Hoffman 1999)

Diagnosis: Differs from O. sinuata  n. comb. in absence of a trichostele on the tibia of the telopod ( Fig. 5View FIGURE 5 A), tibial process slender ( Fig. 5View FIGURE 5 B); the presence of larger coxal lobes on the 17 th leg pair of the male ( Fig. 2View FIGURE 2 B), presence of 5 + 1 black ocelli ( Fig. 1View FIGURE 1 A), and anal shield obviously concave medially at caudal edge ( Fig. 5View FIGURE 5 E). Differs from O. australora  in syncoxital lobe of telopod not divided into two lobes ( Fig. 3View FIGURE 3 B), third antennomere 2 x second ( Fig. 1View FIGURE 1 A), sixth antennomere 4 x second ( Fig. 1View FIGURE 1 A), 2.1 times longer than wide, three striae crossing thoracic shield dorsally ( Fig. 1View FIGURE 1 B).

Redescription: Length of non-stretched but unrolled specimens of both sexes ca 4–5 mm, width 2.2–2.8 mm, respectively.

General coloration strongly faded in alcohol, dark, brown to greyish, often with contrastingly lighter markings on the lateral part of the tergites. Legs, antennae and lateral parts of head grey.

Antenna: third antennomere as large as first and second combined, sixth antennomere as large as first, second, fourth and fifth combined, the latter 2.1 times longer than wide.

Male anal shield at posterior margin medially strongly concave ( Fig. 5View FIGURE 5 E).

Male 17 th leg with strongly developed coxal lobe ( Fig. 5View FIGURE 5 D).

Telopod as in the genus description, with slender tibial process and subtrapeziform subcoxital lobe ( Figs 3View FIGURE 3 B, 5 A –C).

Intraspecific variation: Since the shape of the male telopod, especially those of the tibial process (difference from O. sinuata  ) and the subcoxital lobe (difference from O. australora  ) are important taxonomic characters, these structures were studied in 25 males of the extensive type series and 20 non-type males. No differences in the telopod shape could be observed. Only the shape of the femoral process shows a very high variation, probably because of the membranous nature of this structure.

Comments: The telopods and other characters of this species were not properly described ( Cook 1896) and never redescribed, leading to confusion about the status of the species ( Hoffman 1950), or even the genus ( Mauriès 2005).


Smithsonian Institution, National Museum of Natural History


Smithsonian Institution, National Museum of Natural History


Virginia Museum of Natural History














Onomeris underwoodi Cook, 1896

Wesener, Thomas 2010

O. underwoodi

Cook 1896: 43