Polydrepanum tamilum Carl, 1932

Golovatch, Sergei I., Aswathy, Mathilakath Dasan, Bhagirathan, Usha & Sudhikumar, Ambalaparambil Vasu, 2021, Review of the millipede tribe Polydrepanini, with the description of a new species from Kerala state, southern India (Diplopoda, Polydesmida, Paradoxosomatidae, Alogolykinae), Zootaxa 5068 (4), pp. 485-516 : 493

Polydrepanum tamilum Carl, 1932

Figs 16–20

Polydrepanum tamilum Carl, 1932: 434 , figs 16–18 (D). India. Madras.

Polydrepanum tamilum — Attems, 1936: 233 (R); 1937: 152, fig. 189 (D); Jeekel, 1968: 84 (M); Golovatch, 1984: 335 (M); Bano, 1997: 12 (M); 1998: 89 (M); Bano & Murthy, 1997: 159, fig. 8 (D); Nguyen & Sierwald, 2013: 1182 (M); Golovatch & Wesener, 2016: 48 (M); Sankaran & Sebastian, 2018: 170, fig. 5C (D).

Polydrepanum tamulum (sic!)— Jeekel, 1980b: 175, figs 16–19 (D).

Remarks. Being the type species of Polydrepanum , it shows only male femora 2 equipped with adenostyles ( Fig. 16 ), while the gonopod demonstrates a twisted femorite and a complex solenophore (sph), the latter being divided into a small, subquadrate, lateral protecting lobe (lo) with two adjacent, curved, distofemoral processes (a and b), both latter forming a nearly complete dorsal ring and lying distal to the basal loop (k) of a free and subacuminate solenomere (sl). Base of lo on ventral side forming a protecting shield for the basal sl loop k. Distal half of solenophore strongly curved and directed dorsad ( Figs 17–20 ).

Because P. tamilum shows a clearly twisted gonofemorite ( Figs 17–20 ), vs. an untwisted one in P. asperrimum ( Figs 3–5 ) or P. fissum ( Figs 6–8 ), only two latter species can be considered congeneric and belonging to Grammorhabdus . In contrast, only four species, including both P. tamilum and P. horridum , appear to represent true named Polydrepanum , as further discussed below.

Figures

FIGURES 16–20. Polydrepanum tamilum Carl, 1932. 16. Male leg 2, lateral view. 17. Entire left gonopod, mesal view. 18. Distal half of left gonopod, lateral view. 19. Entire right gonopod, mesal view. 20. Distal half of right gonopod, sublateral view. 16–18: after Carl (1932); 19, 20: after Jeekel (1980b). Abbreviations: a and b, dorsal distofemoral processes; ad, adenostyle; lo, lateral protecting lobe/shield; k, basal loop of solenomere; sl, solenomere; sph, solenophore. Drawn not to scale.

FIGURES 1–5. Grammorhabdus asperrimus Carl, 1932. 1. Male leg 1, lateral view. 2. Male leg 2, lateral view. 3. Entire left gonopod, mesal view. 4, 5. Distal half of left gonopod, lateral view. 1–4: after Carl (1932), 5: after Jeekel (1980B). Abbreviations: a and b, apicomesal spines; ad, adenostyle; ca, cannula; cx, coxite; fe, femorite; k, basal loop of solenomere; lo, lateral lobe; pfe, prefemoral portion; sl, solenomere; sph, solenophore. Drawn not to scale.

FIGURES 6–8. Grammorhabdus fissus (Sankaran & Sebastian, 2018). 6, 7. Right gonopod, ventral and mesal views, respectively. 8. Distal half of right gonopod, lateral view. After Sankaran and Sebastian (2018). Abbreviations: a and b, apicomesal lobes; ad, adenostyle; ca, cannula; cx, coxite; fe, femorite; k, basal loop of solenomere; lo, lateral lobe; pfe, prefemoral portion; sl, solenomere; sph, solenophore; su, distofemoral sulcus. Scale bars: 0.5 mm (6, 7) and 0.2 mm (8).