Nannaria missouriensis Chamberlin, 1928

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

Nannaria missouriensis Chamberlin, 1928 Figs 38 , 39 Vernacular name: "The Missouri Twisted-Claw Millipede"

Mimuloria missouriensis Chamberlin, 1928: 155; Chamberlin and Hoffman 1958: 37; Hennen and Shelley 2015: 9, fig. 15.

Nannaria missouriensis : Hoffman, 1964: 33; Hoffman 1999: 367. Marek et al. 2014: 37. Means et al. 2021: S70-S71.

Material examined.

Holotype: United States - Missouri • ♂ St. Charles ; 1926; M. J. Brown leg.; NMNH P-6.

Paratypes: United States - Missouri • 3 ♂♂; same collection data as holotype; NMNH P-9 • 3 ♀♀; same collection data as holotype; NMNH P-15 • 1 ♀; [Allotype] same collection data as holotype; NMNH IC .

Other material.

United States - Missouri • 1 ♂, 1 ♀; Cole County, Jefferson Cirty ; 38.5767°N, - 92.1735°W; 1 Oct. 1944; W. Dowdy leg.; NCSM NAN0535 • 1 ♂, 1 ♀; Morgan County, Versailles ; 38.4314°N, - 92.8410°W; 1 Apr. 1959; J. Brooks leg.; NCSM NAN0536 • 1 ♀; St. Charles County, Weldon Spring Conservation Area, Lost Valley Trail ; 38.6706°N, - 90.7515°W; elev. 164 m; 18 May 2017; hand collected; J. Means, D. Hennen, V. Wong; VTEC MPE02800 . For detailed collection data see Suppl. material 7 .

Diagnosis.

Adult males of Nannaria missouriensis are distinct from other Nannaria , and the nearby N. castanea , based on the following combination of characters: Gonopods. Gonopodal acropodite gently curving medially. Distal zone with medial and lateral flanges at 90° angle to solenomere (Fig. 38B , red arrow), not with medial flange at 135° angle to tip as in N. castanea . Acropodite with small medial flange near apex (Fig. 38A , red triangle), not lacking as in N. castanea . Telopodite basal zone height ca. 1/3 length of acropodite, not ca. 1/2 length as in N. castanea . Prefemoral process reduced to small bump arising from top of projected, stout prefemoral spine (Fig. 38A , red circle), not projected, acicular as in N. castanea . Color. Tergites with orange paranotal spots (Fig. 39 ) and occasionally faint orange stripes (Fig. 39 ). Dark to light brown background. Dorsum of collum smooth with orange margin.

Measurements.

♂ holotype (NMNH): BL = N/A, CW = 2.9, IW = 1.7, ISW = 0.7, B11W = N/A, B11H = N/A; ♀ paratype (NMNH, IC): BL = 25.4, CW = 1.6, IW = 1.7, ISW = 0.7, B11W = 3.4, B11H = 2.3.

Variation.

As Hennen and Shelley (2015) noted, there is some slight variation in the prefemoral process and spine between populations of N. missouriensis .

Distribution.

Known from central and eastern Missouri (Missouri: Cole, Morgan, Phelps, and St. Charles counties, Suppl. material 7; Fig. 129 ). Distribution area: 10, 977 km2; status: WRE.

Ecology.

Individuals of N. missouriensis have been collected from mesic deciduous forests dominated by pawpaw, maple, ironwood, and oak, often found under 1-2 cm dark, crumbly soil on hillsides.

Etymology.

Chamberlin (1928) gave no etymology for Nannaria missouriensis , but it is reasonable to assume that the specific name is in reference the state of Missouri.

Type locality.

United States, Missouri, St. Charles.

Note.

In the original publication, Chamberlin (1928: 155) mentions eight type specimens, one of which he designated as the holotype (NMNH P-6). Chamberlin (1928) did not mention the sex of the paratypes, but we examined the type material and found three male and four female paratypes, one of which (NMNH IC) was labeled as an allotype. Type specimens were collected in 1926 by M. J. Brown.

Figures

Figure 38. Nannaria missouriensis Chamberlin, 1928, holotype ♂ (NMNH, P- 6) left gonopod A anterior view; red triangle indicates small medial flange on acropodite; red circle indicates reduced prefemoral process B medial view; red arrow indicates medial and lateral flanges on tip at 90 ° to acropodite C posterior view. Scale bar: 0.5 mm.

Figure 39. Nannaria missouriensis Chamberlin, 1928 ♀ (VTEC, MPE 02800) coloration. Scale bar: 4.0 mm.

Figure 129. Distribution map of Nannaria minor species group collection localities west of the Appalachians.