Nannaria ambulatrix, Means & Hennen & Marek, 2021
Means, Jackson C., Hennen, Derek A. & Marek, Paul E., 2021, A revision of the minor species group in the millipede genus Nannaria Chamberlin, 1918 (Diplopoda, Polydesmida, Xystodesmidae), ZooKeys 1030, pp. 1-180: 1
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Holotype: United States - Virginia • ♂; Smyth County, west slope of Big Walker Mtn., VA-16; 36.9112°N, - 81.5317°W; elev. 1054 m; 9 Sept. 2014, J. Means leg.; hand collected; VTEC MPE00178 View Materials . GoogleMaps
Paratypes: United States - Virginia • 1 ♀; same data as for holotype; VTEC, MPE00174 View Materials GoogleMaps • 2 ♂; same data as for holotype; VTEC MPE00166 View Materials GoogleMaps , 167 • 2 ♂ and 1 ♀; same data as for holotype; VMNH, MPE00169 View Materials GoogleMaps , 179, 180.
United States - Virginia • 1 ♂ Washington County, Mendota, steep hillside beside intersection of CR 614 and CR 620, near Holston River ; 36.7146°N, - 82.2806°W; elev. 381 m; 12 Feb. 2018; hand collected J. Means, D. Hennen, P. Marek leg.; VTEC MPE03789 View Materials • 1 ♂ GoogleMaps ; Washington County, Mendota, Anderson Rd. ; 36.7219°N, - 82.2771°W; elev. 464 m; 11 Feb. 2017; J. Means, D. Hennen, V. Wong leg.; hand collected; VTEC MPE02286 View Materials • 1 ♂ GoogleMaps Washington County, Mendota , VA-620, ca.1 road km NE jct w/VA-614; 36.7192°N, - 82.2775°W; elev. 287 m; 12 Feb. 2018; J. Means, D. Hennen, P. Marek leg.; hand collected; VTEC MPE04240 View Materials • 3 ♀ GoogleMaps ; same collection data as for preceding; VTEC MPE03797 View Materials , 3799, 4270 • 5 ♂♂ GoogleMaps ; same collection data as for preceding; VTEC MPE03794 View Materials , 3800-3803 • 2 ♀♀ GoogleMaps ; Washington County, Mendota, Fugate Gap ; 36.7285°N, - 82.3026°W; elev. 609 m; 12 Feb. 2018; hand collected; J. Means, D. Hennen, P. Marek leg.; VTEC MPE03795 View Materials , 3804 • 1 ♂ GoogleMaps Washington County, DF site off VA. 620, 1 km E of Mendota ; 36.7108°N, - 82.2904°W; 11 June 1998; VMNH Survey leg.; VMNH NAN0137 • 1 ♂ GoogleMaps ; Washington County, DF site off VA. 620, ca. 2 mi NE of Mendota ; 36.7313°N, - 82.2760°W; 8 Aug.-2 Dec. 1997; VMNH Survey leg.; VMNH NAN0307 • 1 ♂ GoogleMaps ; Washington County, Abram's Fall , ca. 2 mi SW of Benhams, end of VA. 614; 36.6580°N, - 82.2439°W; 15 June 1960; R. Hoffman leg.; VMNH NAN0308 • 1 ♂ GoogleMaps ; Smyth County, Hungry Mother State Park, inside Hemlock Haven conference center; 36.8914°N, - 81.5249°W; 5 Aug. 2009; J. Beard leg.; VMNH NAN0124 • 1 ♂ GoogleMaps ; Smyth County, Big Walker Mountain, ca. 3 mi west of Hungry Mother State Park on VA. 16, west slope; 36.9104°N, - 81.5333°W; 9 Sept. 1956; R. Hoffman leg.; VMNH NAN0310. For detailed collection data see Suppl. material 7 GoogleMaps .
Adult males of Nannaria ambulatrix sp. nov. are distinct from other Nannaria and the co-occurring N. aenigma , based on the following combination of characters: Gonopods. Gonopodal acropodite very slightly curving medially before apex, nearly straight (Fig. 88 View Figure 88 ). Distal zone short, directed dorsomedially, with large, triangular lateral flange (Fig. 88A View Figure 88 , red arrow), not simple as in N. terricola , or serpentine as in N. aenigma . Telopodite basal zone large, subequal to length of acropodite, not ca. 1/2 length as in N. terricola , or ca. 1/6 length as in N. aenigma . Telopodite basal zone straight, without lateral bulge as in N. terricola . Prefemur with medially curving prefemoral process, not acicular, straight as in N. terricola and N. aenigma . Prefemoral process arising dorsomedially from small, sharp, prefemoral spine (Fig. 88A View Figure 88 , red triangle), not arising from prefemur or with spine reduced to a shelf-like ridge as in N. terricola . Color. Tergites with either white/light yellow or orange paranotal spots (Fig. 89 View Figure 89 ). Gray to black background. Dorsum of collum smooth with either white/light yellow or orange margin, depending on color morph.
♂ holotype (VTEC, MPE00178): BL = 28.0, CW = 4.3, IW = 2.2, ISW = 1.0, B11W = 5.0, B11H = 3.4; ♀ paratype (VTEC, MPE00174): BL = 32.3, CW = 4.3, IW = 2.5, ISW = 0.9, B11W = 5.6, B11H = 3.7.
Specimens of Nannaria ambulatrix sp. nov. collected from the top of Clinch Mountain (36.7285°N, - 82.3026°W, Elev. 845 m) were noticeably smaller than those collected from other localities, suggesting a possible adaptation in the higher elevation population to a drier and/or less suitable habitat. This is the only instance of a stark difference in size between populations of the same species that we have observed in Nannaria .
Known only from southwestern Virginia (Russell, Smyth and Washington counties; Suppl. material 7; Fig. 126 View Figure 126 ). The distribution of N. ambulatrix sp. nov. follows the Brumley and Little Brushy Mountain ranges. Distribution area: 488 km2; status: MRE.
Nannaria ambulatrix sp. nov. individuals were collected from mesic broadleaf deciduous forests, often in groups occupying 1-2 m2 patches, suggesting that the species is distributed in a highly aggregated manner.
This species is named for its type locality (Big Walker Mountain), and was informally proposed by R.L. Hoffman. The specific name is a noun in apposition derived from the Latin ambulo, to walk, and trix, 'a female doer of an action.'
United States, Virginia, Smyth County, west slope of Big Walker Mtn., VA-16, 36.9112°N, - 81.5317°W.
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