Nannariina Hoffman 1964

Shelley, Rowland M. & Smith, Jamie M., 2018, Expanded concept and revised taxonomy of the milliped family Xystodesmidae Cook, 1895 (Polydesmida: Leptodesmidea: Xystodesmoidea): incorporations of Euryuridae Pocock, 1909 and Eurymerodesmidae Causey, 1951, taxon revivals / proposals / transferrals, and a distributional update, Insecta Mundi 660, pp. 1-41 : 15

Subtribe Nannariina Hoffman 1964 , New Status

Diagnosis. Flexible and pliable Eurymerodesmini; mandibular stipes smooth, without ridges or projec- tions; postgonopodal sterna of males and all sterna of females essentially glabrous, caudal margins with acuminate, subtriangular spines subtending leg coxae; ambulatory prefemora with ventrodistal spines; pregonopodal tarsal claws of males twisted, broad, and spatulate. Gonopodal aperture glabrous, rounded or ovoid, margins not modified. Gonopods in situ medially oriented, cannulae mediad and telopodites extending anteriad over anterior margins of apertures; telopodites usually with variable prefemoral processes, acropodital hairs moderately long, usually discontinuous with light apical tufts on “inner” margins not obscuring “distal zones.” Cyphopodal valves of normal sizes and proportions for family, completely hidden in apertures, distal corners without extensions and projections.

Components. Nannaria and Mimuloria , both by Chamberlin; Oenomaea Hoffman ( Hoffman 1964a, 1980, 1999; Hennen and Shelley 2015).

Distribution ( Fig. 1 , green; Fig. 16 , red). East-Nearctic; endemic to the central and eastcentral US. The distribution extends, north/south, from Lake Ontario New York, northern Ohio, central Illinois, and Missouri south of the Missouri River to northeastern/eastcentral North Carolina, northernmost South Carolina, northern Georgia and Alabama, and northeastern Arkansas; east/west, it ranges from Virginia and Maryland west of Chesapeake Bay, eastcentral Pennsylvania, and adjacent New York to western Missouri and adjacent northern Arkansas.

Remarks. Because of their clearly shared ancestry, we transfer this taxon from Xystodesminae to Eurymerodesmini, which holds priority by 13 years for the tribal name. Nannariinan acropodital hairs are longer than in any xystodesmine taxon, and they extend (dis)continuously along primarily the “inner” surface rather than the “outer,” as shown by Chamberlin (1949, Fig 1 ) and Hoffman (1964a, Fig. 11 ) in the in situ gonopods of Nannaria minor Chamberlin. Additionally , eurymerodesminans and nannariinans are similar in overall body sizes and convexities of the dorsums. Divergence entailed development of a prefemoral process by Nannariina, which retained plain, ovoid apertures and traditional cyphopods, while Eurymerodesmina developed extreme elaborations of both, and their overlapping ranges in Arkansas and Missouri, west of the Mississippi River, and Illinois, Kentucky and Tennessee to the east, support our shared ancestry hypothesis. Molecular investigations are also in order.

Figures

Figure 1. Distribution of Euryurinae plotted against the maximal extent of the Cretaceous Western Inland Sea. Euryurina (Euryurini, red), Eurymerodesmina (Eurymerodesmini, black), Nannariina (Eurymerodesmini, green). The red line, Euryurina, in eastern North Carolina and southcentral Virginia connects disparate peripheral localities; the area of greatest euryurinan concentration is circumscribed by the red dots.

Figure 16. Distribution of Eurymerodesmini plotted against the maximal extend of the Cretaceous Western Inland Sea. Black line, Eurymerodesmina. Red line, Nannariina.

Figures 8–15. Eurymerodesmini gonopodal tel-/acropodites; 8–11, Nannariina. 8) telopodite of Nannaria cayugae Chamberlin, Tompkins Co., NY. 9) acropodite of the same. 10) telopodite of Mimuloria castanea (McNeill), Monroe Co., IN. 11) the same of M. d. dilatata Hennen and Shelley, Marshall Co., TN. 12–15, Eurymerodesmina. 12) Eurymerodesmus varius louisianae Chamberlin, Natchitoches Par., LA. 13) acropodite of a second individual from the same locality. 14) the same, Columbia Co., AR. 15) E. v. varius (McNeill), Escambia Co., FL. Figures 8–9 reprinted from Chamberlin (1949) with permission from the Biological Society of Washington. Figures 10–11 reprinted from Hennen and Shelley (2015) with permission of the Center for Systematic Entomology. Figures 12–15 reprinted from Shelley (1990a) with permission of the American Entomological Society.