Antichiropus filiolus 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 : 28-29

Antichiropus filiolus Car , n. sp. ( Figs 14 A–E, 16) ZooBank: urn:lsid:zoobank.org:act:49F0DA5A-29E4-4E3D-848A-481DFA0A3653

Type material examined. Australia: Western Australia: holotype male (badly damaged), Flinders, ca. 100 km NW. of Tom Price , 22°10’34.2”S, 117°28’09.9”E, 4 April 2011, stygofauna net, J.S. Cocking and M.K. Curran (WAM T116433)

Diagnosis. This species is minute compared with all other species with a short, simple gonopod.

Description. Male holotype: Body ca. 10 mm long; midbody ring ca. <1 mm wide, with lightly beaded waist, metazonite and prozonite of similar width. The only specimen pale and translucent,

Colour true colour unknown ( Fig 14A ): leg colour slightly darker. No paranota ( Fig 14B ). Sternites without obvious processes/tubercles, sternal lamella narrow, rounded. Leg coxal processes absent. Anterior spiracles at midbody tiny, indistinct.

Head smooth without noticeable sculpturing; frons with few setae; face 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, clavate.

Collum (badly damaged) much shorter than head (in lateral view) ( Fig 14A ).

Gonopod short, reaching ring 6; coxa (C) upright, short; prefemur (PF) much shorter than femorite; femorite (F) 3/5 acropodite length, upright, narrow at base, thickening abruptly towards apex; main femoral process (MFP) 1/3 femorite length, narrow, pointed; second femoral process (fp1) absent; prolongation of femorite (prof), narrow, upright, pointed; solenomere (S) short, forming small circle, thinner than femorite, generally of similar thickness along length, narrowing 2/3 along its length to broaden slightly again at its tip; solenomere tip asymmetrical with slight point; solenomere process (sp1) at solenomere tip, tiny, pointed; second solenomere process (sp2) near solenomere tip, broad, jagged ( Figs 14 C–E).

Female: unknown.

Distribution. This species is known from only one site, situated north-west of the town of Tom Price ( Fig 17 ).

Etymology. This species is very small, with simple gonopods (Latin, noun, filiolus , little son).

Figures

FIGURE 14. Antichiropus filiolus Car, n. sp., holotype male (WAM T116433): A–B, habitus: A, lateral view; B, dorsal view; C–E, left gonopod: C, posterior view; D, medial view; E, lateral view. Anterior view not available. Abbreviations: F, femorite; MFP, main femoral process; PF, prefemur; prof, prolongation of femorite; S, solenomere; sp1 and 2, solenomere processes1 and 2. Scale bars: A = 2 mm; B = 0.5 mm; C–E = 0.5 mm.

FIGURE 17. Antichiropus georginae Car, n. sp.: A–B, holotype male (WAM T145175): 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; lp, lateral process; MFP, main femoral process; PF, prefemur; prof, prolongation of femorite; S, solenomere; sp1 and sp2, solenomere processes1 and 2. Scale bars: A = 2 mm; B = 2 mm; C–F = 0. 5 mm.