Chelodesmidae, Cook, 1895

Enghoff, Henrik, Ngute, Alain Senghor K., Mnendendo, Hamidu R., Kivambe, Exaud E., Mhagawale, Waziri, Malanda, Robin C., Mpoto, Athuman & Marshall, Andrew R., 2025, A mountain of millipedes XII. The Chelodesmidae of the Udzungwa Mountains, Tanzania (Diplopoda, Polydesmida), European Journal of Taxonomy 997, pp. 210-255 : 249-250

Key to Chelodesmidae from the Udzungwa Mountains (based on gonopodal characters)

1. Prefemoral process (prp) not in contact with solenomere ( Fig. 19 ); coxa (cx) without a conical process distally on anterior side ............................................ Callistocilla dolorotrix Hoffman, 2005

– Prefemoral process in close contact with solenomere; coxa usually with a conical process (cxp) distally on anterior side ..................................................................................................................... 2

2. Prefemoral process ( Figs 16–17 , prp) elaborate, with several rows of strong spikes ........................ ................................................................................... Dionaeadesmus force Enghoff gen. et sp. nov.

– Prefemoral process not so elaborate, without rows of strong spikes ................................................ 3

3. Solenomere (slm) very broad, much broader than prefemoral process ( Fig. 14 ) ............................... .................................................................................................... Tanzaniella howelli Hoffman, 1977

– Solenomere not much broader than prefemoral process ( Morogorius spp. ) .................................... 4

4. Parasolenomere (ps) deeply divided into two subequal lobes; coxal process (cxp) very poorly developed ( Figs 5–6 ) ............................................................... Morogorius divisus Enghoff sp. nov.

– Parasolenomere not divided into subequal lobes .............................................................................. 5

5. Parasolenomere (ps) slender, straight, pointed with a tiny needlelike side branch (nb) ( Fig. 9 ) ........ .................................................................................................... Morogorius pugio Enghoff sp. nov.

– Parasolenomere different .................................................................................................................. 6

6. Parasolenomere (ps) short, stout ( Figs 11–12 ) ................................................................................. 7

– Parasolenomere (ps) larger, consisting of a broad basal part and a tapering apical part ( Fig. 8 ) ....... ........................................................................................ Morogorius louishanseni Enghoff sp. nov.

7. Parasolenomere (ps) rounded, with a basal retrorse process; prefemoral process very broad, almost circular ( Fig. 12 ) ................................................................... Morogorius cochlear Enghoff sp. nov.

– Parasolenomere (ps) pointed; prefemoral process not so broad ( Fig. 11 ) .......................................... ............................................................................................. Morogorius kitungulu Enghoff sp. nov.

Figures

Fig. 19. Callistocilla dolorotrix Hoffman, 2005, male from Udzungwa Scarp Nature Reserve (NHMD 1184742), right gonopod. A. Lateral view. B. Mesal view. C. Dorsal view. D. Ventral view. E. Solenomere and process of parasolenomeree. Abbreviations: cx = coxa; prp = prefemoral process; ps = parasolenomere; slm = solenomere. Scale bars: A–C = 0.2 mm; D–E = 0.1 mm.

Fig. 16. Dionaeadesmus force Enghoff gen. et sp. nov. A, E–F. Paratype, ♂ from Ndundulu (NHMD 1184562). B–D. Paratype, ♂ from Nyumbanito Mts (NHMD 1184572). A. Rings 18–19 and telson, dorsal view. B. Tip of epiproct, with four spinnerets and globular swellings, posterior view. C. Paranotal microsculpture. D. Limbus. E. Right gonopod, submesal view. F. Right gonopod, anterio-mesal view. Abbreviations: as = anterior coxal setae; ca = cannula; cx = coxa; cxp = coxal process; msp = marginal spikes; prf = prefemoral part; prp = prefemoral process; slm = solenomere; sph = solenophore(?); spr = spiked ridge. Scale bars: A = 0.4 mm; B, E–F = 0.1 mm; C–D = 0.01 mm.

Fig. 17. Dionaeadesmus force Enghoff gen. et sp. nov., paratype, ♂ from Nyumbanito Mts (NHMD 1184572), gonopods. A. Dorsal view. B. Ventral view. C. Sublateral (right) view. D. Left telopodite. E. Left solenomere. Abbreviations: as = anterior coxal setae; cxp = coxal process; msp = marginal spikes; prf = prefemoral part; prp = prefemoral process; prt = prefemoral tooth; ps = parasolenomere; sph = solenophore(?); spr = spiked ridge; sslm = solenomere s. str. Scale bars: A–C = 0.2 mm; D = 0.1 mm; E = 0.05 mm.

Fig. 14. Tanzaniella howelli Hoffman, 1977, male from Udzungwa Mountains National Park (NHMD 1184661), gonopods. A. Oblique ventral view. B. Right gonopod, mesal view. C. Oblique dorsal view. Abbreviations: ca = cannula; cx = coxa; cxp = coxal process; prf = prefemoral part; prp = prefemoral process; ps = parasolenomere; slm = solenomere. Scale bars = 0.1 mm.

Fig. 5. Morogorius divisus Enghoff sp. nov., paratype, ♂ (NHMD 1184699), left gonopod, A. Ventral view. B. Dorsal view. C. Lateral view with directions indicated. D. Submesal view. E. Mesal view. Abbreviations: as = anterior coxal setae; ca = cannula; ci = cingulum; cx = coxa; ls = lateral coxal setae; prf = prefemoral part; prp = prefemoral process; ps = parasolenomere; slm = solenomere. Scale bars = 0.2 mm.

Fig. 6. Morogorius divisus Enghoff sp. nov., paratype, ♂ (NHMD 1184701), right gonopod, prefemoral process cut at X. A. Meso-ventral view. B. Sub-anterior view. C. Tip of solenomere. D. Separated prefemoral process. Abbreviations: ps = parasolenomere; slm = solenomere. Scale bars. A = 0.2 mm; B, D = 0.1 mm; C = 0.01 mm.

Fig. 9. Morogorius pugio Enghoff sp. nov., holotype, ♂ (NHMD 1184710), left gonopod. A. Lateral view. B. Tip of solenomere. C. Mesal view. D. Ventral view (most prefemoral setae trimmed). E. Parasolenomere, isolated. F. Anterior view. Abbreviations: as = anterior coxal seta; ca = cannula; ci = cingulum; cx = coxa; cxp = coxal process; ls = lateral coxal setae; nb = needlelike side branch; prf = prefemoral part; prp = prefemoral process; ps = parasolenomere; slm = solenomere. Scale bars: A, C–D, F = 0.2 mm; B = 0.02 mm; E = 0.1 mm.

Fig. 11. Morogorius kitungulu Enghoff sp. nov., holotype, ♂ (NHMD 1184573), left gonopod. A. Mesal view. B. (Dorso)lateral view. C. Ventrolateral view. D. Acropodite, meso-ventral view. Abbreviations: as = anterior coxal setae; ca = cannula; ci = cingulum; cx = coxa; cxp = coxal process; ls = lateral coxal setae; prf = prefemoral part; prp = prefemoral process; ps = parasolenomere; slm = solenomere; sr = serrate ridge of solenomere; sslm = solenomere s. str. Scale bars: A–B = 0.2 mm; C–D = 0.1 mm.

Fig. 12. Morogorius cochlear Enghoff sp. nov., holotype, ♂ (NHMD 1184574), left gonopod. A. Mesal view. B. Lateral view. C. Close-up of parasolenomere. D. Ventral view. E. Acropodite, mesal view. Abbreviations: as = anterior coxal setae; ca = cannula; ci = cingulum; cx = coxa; cxp = coxal process; ls = lateral coxal setae; prf = prefemoral part; prp = prefemoral process; ps = parasolenomere; psp = process of parasolenomere; slm = solenomere; sslm = solenomere s. str.; tr = triangular canopy of prefemoral process. Scale bars: A–B, D = 0.2 mm; C, E = 0.1 mm.

Fig. 8. Morogorius louishanseni Enghoff sp. nov., paratype, ♂ (NHMD 1184653), left gonopod. A. Lateral view. B. Submesal view. C. Dorsal view. D. Ventral view. E. Anterior view. Abbreviations: as = anterior coxal setae; ca = cannula; ci = cingulum; cx = coxa; cxp = coxal process; mvs = mesoventral setae; prf = prefemoral part; prp = prefemoral process; ps =parasolenomere; slm = solenomere. Scale bars = 0.2 mm.