Thyropygus induratus

Pimvichai, Piyatida, Enghoff, Henrik & Panha, Somsak, 2011, A revision of the Thyropygus allevatus group. Part 3: the T. induratus subgroup (Diplopoda: Spirostreptida: Harpagophoridae), Zootaxa 2941, pp. 47-68 : 49

Key to species of the induratus subgroup

1 Anterior coxal fold (ac) distally with one process ( Figs 3 A, 4A, 7A, 8A).......................................... 2

- Anterior coxal fold (ac) distally with two distinct processes ( Figs 1 A, 2A, 5A, 6A).................................. 5

2 Anterior coxal fold (ac) apically bent abruptly mesad, with an acute narrowed, slender tip ( Fig. 3 A)............................................................................................... Thyropygus resimus Attems, 1938

- Anterior coxal fold terminating in a relatively broad, rounded process............................................ 3

3 Telopodite distally to femoral spine (fe) with a relatively large, broad, rounded lobe (lo); ac distolaterally rounded, distomesally produced in distad rounded lobe ( Figs. 7 A, C).................................. Thyropygus laterolobatus n. sp.

- Telopodite distally to fe without a relatively large, broad, round lobe (lo).......................................... 4

4 Femoral spine (fe) relatively long, originating from mesal part of the telopodite ‘knee’, curving rearwards and closely appressed to telopodite shaft; tip of ac a broadly rounded lobe pointing disto-mesad ( Fig. 4 C)................................................................................................. Thyropygus siamensis Verhoeff, 1938

- Femoral spine (fe) short, slender, curving almost in a horizontal plane, at right angles to the telopodite shaft; distal, disto-mesad lobe of ac relatively narrow ( Fig. 8 C).......................................... .. Thyropygus macrosiamensis n. sp.

5 Telopodite distally to fe with a relatively large, broad, round lobe (lo); anterior coxal fold (ac) rounded distolaterally, mesally produced into distad, pointed process with a smaller accessory process on its lateral side ( Figs. 6 A, C).................................................................................................. Thyropygus dormiens n. sp.

- Telopodite distally to fe without a large, broad, round lobe (lo)................................................. 6

6 Anterior coxal fold (ac) distally with two acuminate processes, the outer shorter and smaller than the inner one; femoral spine (fe) relatively long, very distinctly crenulated along outer curvature ( Figs. 5 A–C, E).. Thyropygus uncinatus ( Demange, 1961)

- Anterior coxal fold (ac) distally with two processes, the outer forming a slender, sharp spine, curving mesad, the inner broadly rounded, flattened, transparent, flexible; ac laterally very thick in posterior view.................................. 7

7 Paracoxites (px) extremely high; male body diameter 10.2–14.3 mm ( Fig. 1 A)......... Thyropygus induratus Attems, 1936

- Paracoxites (px) high (but not extremely high); male body diameter 5.6–6.5 mm ( Fig. 2 A)....................................................................................................... Thyropygus quietus Attems, 1938

Figures

FIGURE 1. Thyropygus induratus (specimen from Phu-wiang, except B), gonopods. A: anterior view, left telopodite removed. B: anterior view, anterior coxal fold (specimen from Yotdome). C: posterior view, left telopodite removed. D: left telopodite, posterior-mesal view. E: left telopodite, anterior-lateral view.

FIGURE 2. Thyropygus quietus, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, posterior-mesal view. D: left telopodite, anterior-lateral view.

FIGURE 3. Thyropygus resimus (specimen from Phu-Kum-Khao), gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C, D: left telopodite, posterior-mesal view. E: left telopodite, anterior-lateral view.

FIGURE 4. Thyropygus siamensis (specimen from Chulalongkorn University area), gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, posterior-mesal view. D: left telopodite, anterior-lateral view.

FIGURE 5. Thyropygus uncinatus (specimen from Koh Sichang, except B and C), gonopods. A: anterior view, left telopodite removed. B: anterior view, anterior coxal fold (specimen from Ban Nong Phue). C: anterior view, anterior coxal fold (specimen from Simathani Hotel) D: posterior view, left telopodite removed. E: left telopodite, posterior-mesal view. F: left telopodite, anterior-lateral view.

FIGURE 6. Thyropygus dormiens, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, posterior-mesal view. D: left telopodite, anterior-lateral view.

FIGURE 7. Thyropygus laterolobatus, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, posterior-mesal view. D: left telopodite, anterior-lateral view.

FIGURE 8. Thyropygus macrosiamensis, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, posterior-mesal view. D: left telopodite, anterior-lateral view.