Sphaerobelum

Wongthamwanich, Nattarin, Panha, Somsak, Sierwald, Petra, Wesener, Thomas & Thirakhupt, Kumthorn, 2012, A new species of the giant pill-millipede genus Sphaerobelum Verhoeff, 1924 from northern Thailand, with an extensive description and molecular characters (Diplopoda: Sphaerotheriida: Zephroniidae), Zootaxa 3220, pp. 29-43 : 34

Key to species of Sphaerobelum

1. Anterior telopod with 3 podomeres........................................................................ 2

- Anterior telopod with 4 podomeres....................................................................... 4

2. Tergites shiny, glabrous.......................................................... S. clavigerum Verhoeff, 1924

- Tergites hairy........................................................................................ 3

3. Dirty olive-brown; head punctured and densely hairy; process of 2nd podomere of posterior telopod apically strongly swollen, spherical, wider than basis of 3rd podomere............................................ S. hirsutum Verhoeff, 1924

- Black; head smooth; process of 2nd podomere of posterior telopods truncated; operculum of vulva two-horned, both horns blunt............................................................................ S. bicorne Attems, 1938

4. Podomere 3 of anterior telopod distally with lateral extension; podomere 4 of posterior telopod distally with incurved process, overlapping with process of podomere 2; marginal setae of tergite not reaching posterior margin.. S. separatum Attems, 1953

- Podomere 3 of anterior telopod cylindrical, without lateral extension; podomere 4 of posterior telopod without incurved pro- cess, but with 3 separated spines; marginal setae of tergite reaching posterior margin................. S. truncatum n. sp.