Pseudopolydesmus collinus COLLINUS HOFFMAN 1974
Creators: name: Sierwald, Petra
name: Hennen, Derek A
name: Zahnle, Xavier J
name: Ware, Stephanie
name: Marek, Paul E
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplopoda
Polydesmida
Polydesmidae
Pseudopolydesmus
Pseudopolydesmus collinus

description: PSEUDOPOLYDESMUS COLLINUS HOFFMAN, 1974
(FIGS 15, 16)
Pseudopolydesmus collinus Hoffman, 1974: 346, figs 1, 2, ♂ HT (VMNH, non vidi but see type notes). – [Withrow, 1988: 98, figs 85, 89, 93, 110, 115, 122–126, map 7, tables 9–11.] – Hoffman, 1999: 444.
? Polydesmus moniliaris – Williams & Hefner, 1928: 112, fig. 13a. Mistaken identification!
Diagnosis
Size: Medium-large, with length ranging from 12.9 to 25.3 mm (Withrow, 1988: 199) with an average length of 19 mm (N = 40; Withrow, 1988: 101). Often smaller than Ps. canadensis and Ps. serratus. Comparable in size or slightly smaller than Ps. erasus. Usually larger than Ps. pinetorum.
Paranota and tergal sculpture (Fig. 15): Corners of paranota forming a roughly rhomboid quadrilateral, with ALC posterior to AMC and lateral to PLC. Edges meeting at ALC and PMC forming right angles, with posterior edge longer than in Ps. canadensis. Leading and distal margins very rounded, denticles weak. Angle of curve along distal margin and lateral portion of leading margin uniform from PLC past ALC. Trailing margin moderately concave, less so than Ps. serratus. Anterior blister row medially thicker than median blister row, narrowing only slightly at lateral ends. Median blister row thicker than posterior blister row. Central paranotal blisters large, occupying more than two-thirds of paranotal breadth, as wide as long. Lateral blisters anteriorly widening laterad.
Gonopod (Fig. 16): Gonocoxa ventral lobe with single gonocoxal plate. Telopodite curved and slightly thickened basal to pulvillus, nearly straight beyond pulvillus, with a subterminal kink followed by straight terminal section. Pulvillus medium-sized, midway between base and terminus of acropodite. Process m3 absent. Process e1 reduced to near absence; e2 large, recurved, combined on short, thick stalk with large, subtriangular e3 (Fig. 16C); e4 small (Fig. 16A). Process m1 small, medial of pulvillus; m2 large, subtriangular; m4 typically shaped, well separated from m2 of a similar size (Fig. 16B).
Type notes
(♂ HT, non vidi; five ♂ PT and eight ♀ PT, VMNH, vidi): From Pinnacles of Dan, ~ 4 miles southwest of Vesta, Patrick Co., VA, USA, collected 22 April 1972. We found one jar at VMNH labelled ‘PARATYPE’, containing two vials. One vial contained five ♂ PT (VMNH PSE00044); the other vial contained eight ♀ PT (VMNH PSE00043). The ♂ HT might be included in the vial of ♂ PT without a label. Two male paratype specimens from VMNH PSE00044 were individually relabelled and imaged (VMNH PSE00202 * and VMNH PSE00203 *).
Distribution
Southern Indiana east to West Virginia, south to central Virginia and north-central South Carolina. Williams & Hefner (1928) reported Polydesmus moniliaris C. L. Koch, 1847 as common and abundant throughout the state of Ohio. Based on their figure (fig. 13), Withrow (1988) suggested that this was a misidentification of Ps. collinus, although the figure lacks detail and most probably depicts Ps. canadensis, which also occurs in Ohio.
description: Published as part of Sierwald, Petra, Hennen, Derek A, Zahnle, Xavier J, Ware, Stephanie & Marek, Paul E, 2019, Taxonomic synthesis of the eastern North American millipede genus Pseudopolydesmus (Diplopoda: Polydesmida: Polydesmidae), utilizing high-detail ultraviolet fluorescence imaging, pp. 117-142 in Zoological Journal of the Linnean Society 187 (1) on pages 131-132, DOI: 10.1093/zoolinnean/zlz020, http://zenodo.org/record/5718977