Onomeris australora Hoffman, 1950

Wesener, Thomas, 2010, Revision of the American Pill Millipedes I: Onomeris and Trichomeris (Diplopoda, Glomerida, Glomeridae), Zootaxa 2725, pp. 28-40 : 35-36

Onomeris australora Hoffman, 1950

( Figures 6 A–D)

O. australora Hoffman, 1950: 13

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

Material examined: Type material: 3 M, 3 F syntypes (designated by Dr. R.L. Hoffman) ( USNM [ NMNH] 1872). U.S.A., Georgia, Rabun County, 5 miles S. of Highlands, Glade Mountain, Reed Creek Falls, coll. Hoffman, 27.vii.1949.

Other material examined: 1 M, 2 imm. (FMNH-INS), U.S.A., Tennessee, Great Smoky Mountains NP, 2.5 road miles above Chimney Campground, 3600 ft, leg. HS Dybas, Berlese #5, leaf litter. Determined by N.B. Causey 1960 as O. underwoodi .

Literature record: Hoffman 1950: U.S.A., North Carolina, Macon County, Satulah Mountain at Highlands, 4100 feet, many females taken, coll. R. L. Hoffman, 20-24.vii.1949.

Diagnosis: Differs from O. sinuata n. comb. in absence of a trichostele on the tibia of the telopod ( Fig. 6 C), tibial process slender ( Fig. 6 D); the presence of larger coxal lobes on the 17th leg pair of the male ( Fig. 6 B), and anal shield obviously concave medially at caudal edge ( Fig. 6 A). Differs from O. underwoodi in syncoxital lobe of telopod not subtrapeziform but divided into two lobes ( Fig. 6 C), third antennomere 1.5 x second, sixth antennomere 3x second, 2.5 times longer than wide, four striae cross thoracic shield dorsally.

Redescription: Length of non-stretched but unrolled syntypes in the male 4.2 mm, female 4.8 mm, width in male 2.1 mm, female 2.5 mm.

General coloration strongly faded in alcohol. According to first description ( Hoffman 1950) in living specimens similar to genus description (see above): dark tergites with large lighter field laterally. Legs, antennae and lateral parts of head grey.

Antenna: third antennomere as large as 1.5 x second, sixth antennomere as large as first, second and fourth combined, the latter 2.5 times longer than wide.

Male anal shield at posterior margin medially strongly concave ( Fig. 6 A).

Male 17th leg with strongly developed coxal lobe ( Fig. 6 B).

Telopod as in the genus description, with slender tibial process and bilobed subcoxital lobe ( Figs 6 C, D).

Comments: The main difference between O. underwoodi and O. australora is the shape of the subcoxital lobe of the telopod. This lobe is bilobed in O. australora (all syntype males), while it is subtrapeziform in all checked males of O. underwoodi and O. sinuata .

Figures

FIGURE 6. Onomeris australora Hoffman, 1950, male syntype (USNM [NMNH] 1872). A: male anal shield, view from behind; B: rudimentary male 17 th leg, anterior view; C: right telopod, anterior view; D: right telopod, posterior view. Abbreviations: scl-t = sclerotized teeth. Scale bars = 1 mm.