Gomphodesmidae, Cook, 1896

Olsen, Sissel Anna, Rosenmejer, Trine & Enghoff, Henrik, 2020, A mountain of millipedes IX: Species of the family Gomphodesmidae from the Udzungwa Mountains, Tanzania (Diplopoda, Polydesmida), European Journal of Taxonomy 675, pp. 1-35 : 6-7

Key to species of Gomphodesmidae from the Udzungwa Mts

The key also includes Emphysemastix dracarys sp. nov. from Iringa town.

1. Sternal process of body ring 6 ca 1½ times as long as wide, with median apiculus ( Fig. 5A ). Postnodal telopodite with a subglobose enlargement along the outer curvature...(Genus Emphysemastix Hoffman, 1966 ).................................................................................................................................. 2

– Sternal process of body ring 6 different (the sternal process of Agrophogonus pusillokiellandi Olsen & Enghoff sp. nov. is broken in the unique holotype). Postnodal telopodite without a subglobose enlargement........................................................................................................................................ 3

2. Paxillus (mid-ventral process on body ring 15) triangular (as Fig. 4A ). Nodal process M absent ..... .......................................................................... Emphysemastix dracarys Olsen & Enghoff sp. nov.

– Paxillus rounded. Nodal processes M and L both present .................................................................. .............................................................................. Emphysemastix frampt Olsen & Enghoff sp. nov.

3. Sternal process on body ring 6 longer than wide with triangular tip ( Fig. 5D ). Nodal process M present, L absent. Gonopod telopodite making a hairpin bend, postnodal telopodite very long and straight, running close to and parallel with coxa ( Fig. 13 ). Paracannular setae absent ....................... .......................................................... Pogoropsis prolixopes Rosenmejer & Enghoff gen. et sp. nov.

– Sternal process of body ring 6 and postnodal telopodite different .................................................... 4

4. Sternal process of body ring 6 broad and flat, or triangular with rounded tip ( Fig. 5 E–G). Nodal process M present...(Genus Pogoro Hoffman, 2005 )........................................................................ 5

– Sternal process of body ring 6 more or less elongate, apically rounded ( Fig. 5 B–C). Nodal process M absent...(Genus Agrophogonus Hoffman, 2005 )............................. 7

5. Enlarged tubercles on hypoproct projecting beyond edge of sclerite................................................ 6

– Tubercles on hypoproct not projecting beyond edge of sclerite.......................................................... ..................................................................................... Pogoro siren Rosenmejer & Enghoff sp. nov.

6. Two subapical lobes on postnodal telopodite, a triangular lateral lobe and an uncate mesal lobe ( Fig. 7 ) .............................................................................................. Pogoro scharffi Hoffman, 2005

– Only one subapical lobe, of a narrow triangular shape, on postnodal telopodite ( Fig. 9 ) ..................................................................... Pogoro alopias Rosenmejer & Enghoff sp. nov.

7. Postnodal telopodite short,flattened,laminate( Fig.19 )… Agrophogonus mwanihana Hoffman, 2995

– Postnodal telopodite longer, slender, evenly attenuate to apex ......................................................... 8

8. Postnodal telopodite very long, forming a subcircular ¾ loop, evenly curved, no sharp angular twist. ( Fig. 18 ) ............................................................ Agrophogonus hamulifer Olsen & Enghoff sp. nov.

– Postnodal telopodite shorter, with a sharp twist in a dorsal direction, perpendicular to prefemoral region, not forming a ¾ circle ( Fig. 21 ) ............................................................................................ 9

9. Body width 8.7 mm. Nodal process C very long, slender and curved ( Hoffman 2005: fig. 451) ....... ............................................................................................ Agrophogonus kiellandi Hoffman, 2005

– Body width 4.1 mm. Nodal process C shorter and less curved ( Fig. 21 ) ............................................ ................................................................. Agrophogonus pusillokiellandi Olsen & Enghoff sp. nov.

Figures

Fig. 5. Sternal process on body ring 6. A. Emphysemastix spp. B. Agrophogonus spp. except A. hamulifer Olsen & Enghoff sp. nov. C. Agrophogonus hamulifer Olsen & Enghoff sp. nov. D. Pogoropsis prolixopes Rosenmejer & Enghoff gen. et sp. nov. E. Pogoro siren Rosenmejer & Enghoff sp. nov. F. Pogoro scharffi Hoffman, 2005. G. Pogoro alopias Rosenmejer & Enghoff sp. nov. Not drawn to scale.

Fig. 4. Particular gomphodesmid structural elements. A. Paxillus – a mid-ventral, most often triangular process on body ring 15 in most gomphodesmid males, from Hoffman (2005), modified. B. Torus – a low convexity of variable size and shape, found on the ventral surface of the poriferous paranota in males of many gomphodesmid species. Not drawn to scale.

Fig. 13. Pogoropsis prolixopes Rosenmejer & Enghoff gen. et sp. nov., paratype, ♂, left gonopod (NHMD 621673). A–B. Mesal view. C. Apex of solenomere. D–E. Lateral view. F–G. Dorsal view. Abbreviations: M = Process M; stl = slender triangular lobe; tl = triangular lobe. Scale bars: 0.5 mm.

Fig. 7. Pogoro scharffi Hoffman, 2005, paratype, ♂, left gonopod (NHMD 621669). A–B. Mesal view. C–D. Lateral view. E–F. Dorsal view. Abbreviations: L = Process L; M = Process M; tl = triangular lobe; ul = uncate lobe. Scale bars: 0.5 mm.

Fig. 9. Pogoro alopias Rosenmejer & Enghoff sp. nov., holotype, ♂ (NHMD 621670), right gonopod. A–B. Mesal view. C–D. Lateral view. E–F. Dorsal view. Abbreviations: L = Process L; M = Process M; tl = triangular lobe. Scale bars: 0.5 mm.

Fig. 19. Agrophogonus mwanihana Hoffman, 2005, specimen from Udzungwa Mts National Park, Sanje Kati camp & plot (NHMD 621682), right gonopod. A–B. Mesal view. C–D. Lateral view. E–F. Dorsal view. Scale bars: 0.5 mm.

Fig. 18. Agrophogonus hamulifer Olsen & Enghoff sp. nov., holotype, ♂ (NHMD 621678), left gonopod. A–B. Mesal view. C–D. Lateral view. E–F. Dorsal view. Abbreviations: A = Process A; B = Process B; C = Process C; L = Process L. Scale bars: 0.5 mm.

Fig. 21. Agrophogonus pusillokiellandi Olsen & Enghoff sp. nov., holotype, ♂ (NHMD 621683). A–D, F–G. Left gonopod. A–B. Mesal view. C–D. Lateral view. F–G. Dorsal view. E. Right gonopod, lateral view. H. Sternal process on ring 6. Abbreviations: A = process A; B = process B; C = process C; L = process L. Scale bars: 0.5 mm.