A revision of the minor species group in the millipede genus Nannaria Chamberlin, 1918 (Diplopoda, Polydesmida, Xystodesmidae) Author Means, Jackson C. https://orcid.org/0000-0001-7377-0696 Virginia Tech, Department of Entomology, Blacksburg, Virginia 24061, USA mjacks4@vt.edu Author Hennen, Derek A. https://orcid.org/0000-0001-7005-1151 Virginia Tech, Department of Entomology, Blacksburg, Virginia 24061, USA Author Marek, Paul E. https://orcid.org/0000-0002-7048-2514 Virginia Tech, Department of Entomology, Blacksburg, Virginia 24061, USA text ZooKeys 2021 2021-04-13 1030 1 180 http://dx.doi.org/10.3897/zookeys.1030.62544 journal article http://dx.doi.org/10.3897/zookeys.1030.62544 1313-2970-1030-1 875199397EEE5F7898EA1DB25DA62D25 Nannaria dilatata (Hennen & Shelley, 2015) Figs 78 , 79 Vernacular name: "The Mossy Rock Twisted-Claw Millipede" Mimuloria dilatata dilatata Hennen & Shelley, 2015: 1-16, figs 18, 19. Nannaria dilatata : Means et al. 2021 : S69. Material examined. Holotype : United States - Tennessee • ♂ ; Marshall County , Henry Horton State Park , campground; [ 35.5875°N , - 86.7035°W ]; 9 May 1979 ; R. M. Shelley leg.; FSCA. Paratype : United States - Tennessee • 1 ♀ ; same collection data as holotype; NCSM NCSM27945 . Other material. United States - Tennessee • 1 ♀ ; Marshall County , Henry Horton State Park , to the right of the main office, under moss on top of large boulder; 35.5914°N , - 86.7029°W ; 13 May 2017 ; hand collected; D. Hennen , J. Means , V. Wong leg.; VTEC MPE02788 . For detailed collection data see Suppl. material 7 . Diagnosis. Adult males of N. dilatata are distinct from other Nannaria , including the nearby N. hippopotamus sp. nov. and Nannaria sp. nov. 'Cratagae' ( Nannaria wilsoni species group) based on the following combination of characters: Gonopods . Gonopodal acropodite gently curving anteromedially, not straight as in N. hippopotamus sp. nov. and Nannaria sp. nov. 'Cratagae.' Acropodite tip with prominent triangular lateral flange curving abruptly at a 90° angle towards tip (Fig. 78A , red triangle), not curving gently and rounded as in N. hippopotamus sp. nov. or lacking as in Nannaria sp. nov. 'Cratagae.' Acropodite with laminate medial flange just proximal to tip, not lacking as in N. hippopotamus sp. nov. and Nannaria sp. nov. 'Cratagae.' Acropodite simple, without medial swelling as in N. hippopotamus sp. nov. Telopodite basal zone ca. 1/4 length of acropodite, not ca. 1/2 as in N. hippopotamus sp. nov. Prefemur with dorsomedially curving prefemoral process, not straight, acicular as in N. hippopotamus sp. nov. and Nannaria sp. nov. 'Cratagae.' Prefemoral spine reduced to small rounded lobe at base of prefemoral process (Fig. 78 , red arrow), not sharp as in N. hippopotamus sp. nov. or lacking as in Nannaria sp. nov. 'Cratagae.' Color . Tergites with light orange paranotal spots and light pink stripes (Fig. 79 ). Light grey background. Dorsum of collum smooth with light pink margin. Figure 78. Nannaria dilatata (Hennen & Shelley, 2015) paratype ♂ (NCSM, NCSM27945) left gonopod A anterior view; red triangle indicates acropodite tip lateral flange B medial view C posterior view; red arrow indicates reduced prefemoral spine. Scale bar: 0.5 mm. Figure 79. Nannaria dilatata (Hennen & Shelley, 2015) non-type ♀ (VTEC, MPE02788) coloration. Scale bar: 4.0 mm. Measurements. ♂ holotype (FSCA): BL = 30.9, CW = 4.1, IW = 2.1, ISW = 0.8, B11W = 4.7, B11H = 3.5; ♀ paratype (NCSM, NCSM27945): BL = 28.1, CW = 3.5, IW = 2.0, ISW = 0.9, B11W = 4.5, B11H = 2.9. Variation. Hennen and Shelley (2015) noted some slight variation between the type locality males and the male collected from Davidson Co., Tennessee, including the latter having a smaller prefemoral spine, a more gradual distal curve of the acropodite, and a reduced acropodite medial swelling. Distribution. Known only from central Tennessee (Tennessee: Davidson and Marshall counties, Fig. 129 ). Distribution area: N/A; status: MRE. Ecology. Hennen and Shelley (2015) provided no ecological notes in their description of N. dilatata , but the single individual collected by DAH for this revision was found under a damp mat of moss on a large boulder. Etymology. Hennen and Shelley (2015 : 14) state "The specific name references the apical dilation on the outer/anterior acropodite surface." Type locality. United States, Tennessee, Marshall County, Henry Horton State Park, campground. Notes. In the original publication, Hennen and Shelley (2015 , 14) designated a male holotype (FSCA) and one male and two female paratypes (FSCA, NCSM), all collected by R. M. Shelley on May 9, 1979. Which paratypes were sent to either the FSCA or NCSM was not mentioned in the original publication; however, the NCSM had only one paratype (female, NCSM27945), implying that the other male and female paratypes are deposited at the FSCA.