Pseudopolydesmus minor, MINOR (BOLLMAN, 1888)

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 : 135-136

publication ID

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

DOI

https://doi.org/10.5281/zenodo.5718991

persistent identifier

https://treatment.plazi.org/id/03E1C602-FFD6-FFE9-FF16-FEF44249398E

treatment provided by

Carolina

scientific name

Pseudopolydesmus minor
status

 

PSEUDOPOLYDESMUS MINOR ( BOLLMAN, 1888) View in CoL

( FIGS 21–25 View Figure 21 View Figure 22 View Figure 23 View Figure 24 View Figure 25 )

Polydesmus minor Bollman, 1888: 2 View in CoL , ♂ ST (USNM, non vidi, type lost). – Chamberlin, 1942b: 19, fig. 32.

Pseudopolydesmus minor View in CoL – Chamberlin, 1943c: 18. – Chamberlin & Hoffman, 1958: 70. – Loomis, 1959: 161, fig. 9. – [ Withrow, 1988: 120, figs 62, 79, 97, 101, 105, 117, 119, 122–126, map 9, tables 9–11.] – Hoffman, 1999: 444.

Polydesmus neoterus Chamberlin, 1942b: 10 View in CoL , figs 30, 31, ♂ HT (USNM, vidi), synon. nov.

Pseudopolydesmus neoterus View in CoL – Chamberlin, 1943c: 18. – Chamberlin & Hoffman, 1958: 70.— Hoffman, 1999: 445.

Polydesmus euthetus Chamberlin, 1942b: 11 View in CoL , fig. 36, two ♂ / ♀ ST (USNM, vidi), synon. nov.

Pseudopolydesmus euthetus View in CoL – Chamberlin, 1943c: 18. – Chamberlin & Hoffman, 1958: 70.— Hoffman, 1999: 444.

Diagnosis

Size: Small, with body length ranging from 8.8 to 12.7 mm and an average body length of 10.5 mm (N = 31; Withrow, 1988: 124, 199). Comparable in size to Ps. caddo and Ps. paludicolus . Clearly smaller than all other congeneric species.

Paranota and tergal sculpture ( Figs 21 View Figure 21 , 22 View Figure 22 ): Corners of paranota forming a narrow parallelogram, with medial and lateral edges roughly twice as long as anterior and posterior edges. Anterior lateral and posterior lateral corners posterior to AMC and PMC, respectively, giving characteristic swept-back appearance. Leading and distal margins highly variable, ranging from moderately to weakly curved. Anterior lateral corners and denticles ranging from moderate to obliterated. Trailing margin concave, strongly curved. Anterior blister row as thick as MB and PB rows combined. Individual MBs and PBs subequal in area. Central paranotal blisters occupying two-thirds of paranotal breadth. Lateral blisters unusually distinct, extending anteriorly past all setiferous denticles, aligned with longitudinal axis.

Gonopod ( Figs 23–25 View Figure 23 View Figure 24 View Figure 25 ): Gonocoxa ventral lobe with two gonocoxal plates stacked dorsoventrally ( Fig. 25A View Figure 25 ). Telopodite uniformly curved. Pulvillus elongate, pointed, much closer to base of acropodite than terminus. Processes e1, e3 and m3 absent. Process e2 very small, lobe-like ( Fig. 25A View Figure 25 ); e4 medium-sized, unusually prominent, basal to terminal bristles. Ectal surface also with large flange (possibly homologous to e3) between processes m2 and m4 ( Figs 23A View Figure 23 , 24A View Figure 24 , 25A View Figure 25 ). Process m1 unusually large, subtriangular, proximal to pulvillus; m2 large, subtriangular, midway between base and terminus of acropodite; m4 small ( Figs 23B View Figure 23 , 24B View Figure 24 , 25B View Figure 25 ).

Type notes

Polydesmus minor (♂ ST, USNM, non vidi, type lost): Bollman (1888) described an unspecified number of specimens from Little Rock, Pulaski Co., AR, USA . He made no mention of female specimens. No type specimens of Ps. minor were located in the USNM collection (Sierwald, November 2015).

Polydesmus neoterus (♂ HT and two ♂ PT, USNM, vidi): From New Orleans, LA, USA, collected 17 April 1936 by L. Hubricht . Type lot: contains two ♂ PT, ♂ HT with gonopods removed, distal extremities of one broken gonopod (without pulvillus). The gonopod remains do not allow unequivocal identification of the specimen. However, paranota shape and tergal sculpture is distinct from that in the types of Ps. caddo (= Ps. bidens ), the only small-bodied congener that occurs in Louisiana.

Polydesmus euthetus (one ♂ and one ♀ ST, USNM, vidi): From Buder Park , Fenton, St. Louis Co., MO, USA collected 15 March 1936 by L. Hubricht . Type lot contains ♂ ST erroneously labelled ‘HT’ with a single dissected gonopod and ♀ ST labelled ‘Lectoallotype’.

Distribution

Southern Arkansas northward through Missouri and Illinois to Lake Michigan. Most commonly collected near the Mississippi River and its tributaries.

Additional specimens examined

FMNH INS7107 * .

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 minor

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

Pseudopolydesmus minor

Hoffman RL 1999: 444
Withrow RP 1988: 120
Loomis HF 1959: 161
Chamberlin RV & Hoffman RL 1958: 70
Chamberlin RV 1943: 18
1943
Loc

Pseudopolydesmus neoterus

Hoffman RL 1999: 445
Chamberlin RV & Hoffman RL 1958: 70
Chamberlin RV 1943: 18
1943
Loc

Pseudopolydesmus euthetus

Hoffman RL 1999: 444
Chamberlin RV & Hoffman RL 1958: 70
Chamberlin RV 1943: 18
1943
Loc

Polydesmus neoterus

Chamberlin RV 1942: 10
1942
Loc

Polydesmus euthetus

Chamberlin RV 1942: 11
1942
Loc

Polydesmus minor

Chamberlin RV 1942: 19
Bollman CH 1888: 2
1888
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