Antichiropus hystricosus Car, 2019

Car, Catherine A., Harvey, Mark S., Hillyer, Mia J. & Huey, Joel A., 2019, The millipede genus Antichiropus (Diplopoda: Polydesmida: Paradoxosomatidae), part 3: species of the Pilbara bioregion of Western Australia, Zootaxa 4617 (1), pp. 1-71 : 35-36

Antichiropus hystricosus Car , n. sp.

( Figs 19 A–F, 25)

ZooBank: urn:lsid:zoobank.org:act:72049057-9005-4B9C-9C9F-8EB7D60D5995

Type material examined. Australia: Western Australia: holotype male (slightly damaged), 24 km SE. of Paraburdoo, Pilbara Biological Survey site TCMBC05 , 23°19’06”S, 117°52’17”E, 30 August 2005 – 31 May 2006 , ethylene glycol pitfall trap, CALM staff (Pilbara Biological Survey) ( WAM T124621 ) . Paratype: 1 male (damaged, many legs missing), collected with holotype ( WAM T144616 ) .

Diagnosis. Gonopod: this species is most similar to A. cucumeraceous Car , n. sp. ( Fig 10 ) but is easily distinguished from it by A. hystricosus Car , n. sp. having noticeable serrations at the base of the solenomere, lacking in the former species. Antichiropus gibbus Car , n. sp. ( Fig 18 ) and A. echinus Car , n. sp. ( Fig 13 ) have similar serrations but A. gibbus has a pronounced protuberance on its femorite which A. hystricosus lacks,, and A. echinus has a slender pointed solenomere tip, while that of A. hystricosus . is transparent, flattened and blunt.One of the most noticeable features of this species, however, is that it lacks a prolongation of the femorite.

Description. Male holotype: Body ca. 15 mm long, midbody ring ca. 1.5 mm wide, with shallow, smooth waist, prozonite and metazonite of similar widths, slight lateral striations, rings 7-5.

Colour (in alcohol) dark brown ( Fig 19A ): legs relatively long, leg colour dark brown. No paranota ( Fig 19B ).

Sternites without obvious processes/tubercles, sternal lamella medium width, heart-shaped. Leg coxal processes absent. Anterior spiracles at midbody tiny, ovoid, flat.

Head smooth, with no sculpturing; frons smooth, sparsely setose; face moderately narrow, maximum width ca. 3x the distance between antennal sockets; sockets separated by ca. 2x width of socket.

Antennae of moderate length, reaching to ring 2, robust, barely clavate.

Collum ca. 0.75x length of head (lateral view) ( Fig 19A ).

Gonopod of medium length, reaching ring 5; coxa (C) more robust but 1/2 femorite length, pronounced ridge on anterior surface; prefemur (PF) ovoid, lightly setose with slight lip; femorite (F) 2/3 length of acropodite, upright, slender at base, broadest mid-length, narrowing then broadening again at apex; main femoral process (MFP) long, slender, held at 45 degrees to femorite; second femoral process (fp1) absent; prolongation of femorite (prof) absent; solenomere (S) relatively long, forming a circle, narrowest at base then broadening, small spines at base; soleno- mere tip flattened, blunt; solenomere process (sp1) small, curved, slender, pointed, in apical 1/3 of solenomere (Figs 19C–F).

Female: unknown.

Distribution. Found only from one site SE of the mining town of Paraburdoo (Fig 25).

Etymology. This species is named for the small spines present at the base of the solenomere (Latin, adjective, hystricosus, thorny, prickly).

Figures

FIGURE 10. Antichiropus cucumeraceous Car, n. sp., holotype male (WAM T124598): A–B, habitus: A, lateral view; B, dorsal view; C–F, left gonopod: C, posterior view; D, anterior view; E, medial view; F, lateral view. Abbreviations: C, coxa; F, femorite; fp1, femoral process 2; MFP, main femoral process; PF, prefemur; S, solenomere; sp1, solenomere process 1. Scale bars: A = 2 mm; B = 2 mm; C–F = 0.5 mm.

FIGURE 13. Antichiropus echinus Car, n. sp., holotype male (WAM T144610): A–B, habitus: A, lateral view; B, dorsal view; C–F, left gonopod: C, posterior view; D, anterior view; E, medial view; F, lateral view. Abbreviations: F, femorite; MFP, main femoral process; PF, prefemur; prof, prolongation of femorite; S, solenomere; sp1, solenomere process 1; St, solenomere teeth. Scale bars: A = 2 mm; B = 1 mm; C–F = 0.5 mm

FIGURE 18. Antichiropus gibbus Car, n. sp., holotype male (WAM T144578): A–B habitus: A, lateral view; B, dorsal view; C–F, left gonopod: C, posterior view; D, anterior view; E, medial view; F, lateral view. Abbreviations: F, femorite; MFP, main femoral process; PF, prefemur; prof, prolongation of femorite; S, solenomere; sp1, solenomere process1. Scale bars: A = 2 mm; B = 2 mm; C–F = 0. 5 mm.

FIGURE 19. Antichiropus hystricosus Car, n. sp., holotype male (WAM T124621): A–B, habitus: A, lateral view; B, dorsal view; C–F, left gonopod: C, posterior view; D, anterior view; E, medial view; F, lateral view. Abbreviations: C, coxa; F, femo- rite; MFP, main femoral process; PF, prefemur; S, solenomere; serr, serrations; sp1, solenomere process 1. Scale bars: A = 2 mm; B = 1 mm; C–F = 0. 5 mm.