Pseudopolydesmus erasus, ERASUS (LOOMIS, 1943)

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, Zoological Journal of the Linnean Society 187 (1), pp. 117-142 : 125-127

publication ID

https://doi.org/ 10.1093/zoolinnean/zlz020

DOI

https://doi.org/10.5281/zenodo.5718973

persistent identifier

https://treatment.plazi.org/id/03E1C602-FFCC-FFF0-FCF1-FAE143463E9F

treatment provided by

Carolina

scientific name

Pseudopolydesmus erasus
status

 

PSEUDOPOLYDESMUS ERASUS ( LOOMIS, 1943) View in CoL

( FIGS 9–12 View Figure 9 View Figure 10 View Figure 11 View Figure 12 )

Polydesmus erasus Loomis, 1943: 406 View in CoL , fig. 17, pl. 1: fig. 5, ♂ HT (MCZ, non vidi).

Dixidesmus erasus – Chamberlin, 1943c: 18. – Causey, 1952: 7 (= D. humilidens View in CoL ). – Chamberlin & Hoffman, 1958: 66.

Pseudopolydesmus erasus View in CoL – [ Withrow, 1988: 84, figs 19, 84, 88, 92, 108, 113, 122–126, map 5, tables 9–11.] – Hoffman, 1999: 444 (= D. tallulanus View in CoL ; D. penicillus View in CoL ).

Dixidesmus tallulanus Chamberlin, 1943c: 19 View in CoL , fig. 34, ♂ HT (USNM, vidi). – Chamberlin & Hoffman, 1958: 67.

[ Pseudopolydesmus tallulanus View in CoL – Withrow, 1988: 79, figs 75, 83, 87, 91, 107, 112, 122–128, map 5, tables 9–11.]

in Ps. serratus . Leading and distal margins moderately curved, similar to Ps. serratus but less curved than Ps. canadensis and Ps. collinus . Denticles weak to obliterated. Trailing margin only slightly concave, nearly straight. Anterior blister row medially much thicker than median blister row, narrowing laterally to become much narrower than median blister row. Median blister 2 much larger in area than MB1. Median blister row thicker than posterior blister row. Central paranotal blisters occupying medial two-thirds of paranota. Lateral blisters anteriorly extending mediad.

Dixidesmus penicillus Chamberlin, 1943c: 19 View in CoL , fig. 35, ♂ / ♀ ST (USNM, vidi). – Chamberlin & Hoffman, 1958: 67.

Dixidesmus humilidens Chamberlin, 1943c: 20 View in CoL , fig. 36, ♂ / ♀ ST (USNM, vidi).

Diagnosis

Size: Large to medium-large, with length ranging from 15.8 to 31.8 mm and an average body length of 21.4 mm (N = 143; Withrow, 1988: 83, 88, 199). Size variable, comparable to Ps. canadensis , Ps. collinus and Ps. serratus . Usually larger than Ps. pinetorum .

Paranota and tergal sculpture ( Fig. 9 View Figure 9 ): Corners of paranota forming a trapezoid, with the anterior (AMC to ALC) edge longer than the posterior (PMC to PLC) edge. Ratio of anterior to posterior edge length smaller than Gonopod ( Figs 10–12 View Figure 10 View Figure 11 View Figure 12 ): Gonocoxa ventral lobe with single gonocoxal plate. Telopodite basally curved, moreor-less straight between pulvillus and process m4, terminally curved, basal half of acropodite distinctly thickened. Pulvillus large and pointed, midway between base and terminus of acropodite. Process m3 absent. Process e1 elongate and straight, arising from thickened area; e2 large and recurved, originating close to base of e3; e3 subtriangular, varies from large to miniscule; e4 nearly identical to m 4 in size and shape ( Figs 10A View Figure 10 , 11A View Figure 11 , 12A View Figure 12 ). Process m1 conspicuous, medial of pulvillus; m2 large, subtriangular; m4 typically shaped, well separated from larger m2 ( Figs 10B View Figure 10 , 11B View Figure 11 , 12B View Figure 12 ).

Type notes

Polydesmus erasus (♂ HT and three ♀ PT, MCZ, non vidi): From Monte Sano State Park , Madison Co., AL, USA, collected 22 July 1939 . According to the description by Loomis (1943), the e3 process is completely absent in Ps. erasus . No such specimen has been seen by the authors; it is more likely that Loomis overlooked the process or his specimen was damaged.

Dixidesmus tallulanus (♂ HT and one ♂ PT, USNM, vidi): ♂ HT from between Clayton and Tallulah Falls, Rabun Co., GA, USA, collected 28 April 1943 ; ♂ PT from Tallulah Falls , Habersham Co., GA, USA, collected 27 April 1943; both collected by W. Ivie . We found two type lots. Type lot 1: labelled ‘HT’, contains one fragmented male, with dissected gonopods in genitalia vial. Type lot 2: labelled ‘PT’, contains one intact male.

Dixidesmus penicillus (11 ♂ and five ♀ ST, USNM, vidi): Chamberlin (1943c) described an unspecified number of male and female specimens from north and northwest of Clarkesville, Habersham Co., GA, USA, collected 27 April 1943 by W. Ivie . We found two type lots. Type lot 1: labelled ‘Types’, contains two intact males, two fragmented females, and two small vials; first small vial labelled ‘HT’ (by Withrow?), contains fragmented male, with dissected gonopods in genitalia vial; second small vial labelled ‘Lectoallotype’ (by Withrow?), contains fragmented female. Type lot 2: labelled ‘Paratypes’, contains two females and eight males, some males with gonopods damaged.

Dixidesmus humilidens (two ♂ and two ♀ ST, USNM, vidi): From Gainesville, Hall Co., GA, USA collected 24 April 1943 by W. Ivie . Type lot labelled ‘ erasus ’ by Withrow. Contains one female, one fragment and two small vials; first small vial labelled ‘Holotype’ by Withrow, contains fragmented male, with dissected gonopods in genitalia vial; second small vial labelled ‘Lectoallotype’ by Withrow, contains intact female with everted vulvae.

Distribution

Southern Appalachian Mountains, west through Tennessee and Kentucky into southern Illinois and south through Alabama to the coast of the Gulf of Mexico.

Additional specimens examined

FMNH INS 1554, 1556 , 3120684 , 3120685 * .

MCZ

Museum of Comparative Zoology

USNM

Smithsonian Institution, National Museum of Natural History

FMNH

Field Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Diplopoda

Order

Polydesmida

Family

Polydesmidae

Genus

Pseudopolydesmus

Loc

Pseudopolydesmus erasus

Sierwald, Petra, Hennen, Derek A, Zahnle, Xavier J, Ware, Stephanie & Marek, Paul E 2019
2019
Loc

Pseudopolydesmus erasus

Hoffman RL 1999: 444
Withrow RP 1988: 84
1988
Loc

Pseudopolydesmus tallulanus

Withrow RP 1988: 79
1988
Loc

Polydesmus erasus

Loomis HF 1943: 406
1943
Loc

Dixidesmus erasus

Chamberlin RV & Hoffman RL 1958: 66
Causey NB 1952: 7
Chamberlin RV 1943: 18
1943
Loc

Dixidesmus tallulanus

Chamberlin RV & Hoffman RL 1958: 67
Chamberlin RV 1943: 19
1943
Loc

Dixidesmus penicillus

Chamberlin RV & Hoffman RL 1958: 67
Chamberlin RV 1943: 19
1943
Loc

Dixidesmus humilidens

Chamberlin RV 1943: 20
1943
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