Attemsostreptus, Verhoeff, 1941

Enghoff, Henrik, Ngute, Alain S. K., Kwezaura, Revocatus L., Laizzer, Richard L., Lyatuu, Herman M., Mhagawale, Waziri, Mnendendo, Hamidu R. & Marshall, Andrew R., 2024, A mountain of millipedes XI. The trachystreptoform spirostreptids of the Udzungwa Mountains, Tanzania (Diplopoda, Spirostreptida, Spirostreptidae), European Journal of Taxonomy 918 (1), pp. 1-50 : 23

Key to species of Attemsostreptus

1. Lateroapical metaplical process (lap) of gonopod coxa extremely long, bent in a U-shape ( Figs 3B , 7A ) ........................................................................................... A. reflexus Akkari & Enghoff, 2019

– Lateroapical metaplical process (lap) only moderately curved ........................................................ 2

2. Lateroapical metaplical process (lap) more than half as long as gonopod coxa, directed laterad or laterobasad ........................................................................................................................................ 3

– Lateroapical metaplical process (lap) less than half as long as gonopod coxa, directed pronouncedly basad ................................................................................................................................................. 4

3. Lateroapical metaplical process (lap) almost as long as coxal height; mesapical metaplical process (map) separated from rest of metaplica by rounded incision ( Akkari & Enghoff 2019: fig. 1) ......... ................................................................................................................... A. costatus Verhoeff, 1941

– Lateroapical metaplical process (lap) only slightly longer than half coxal height; mesapical metaplical process (map) poorly delimited from rest of metaplica ( Fig. 8D–E ) ................................................. ............................................................................................................ A. cataractae Enghoff sp. nov.

4. Metazonites not carinate but striate as in species of Julidae ( Fig. 9B ); 58–62 podous rings; distomesal coxal spine (mcs) short, directed apicad ( Fig. 11A, D ) .................... A. julostriatus Enghoff sp. nov.

– Metazonites with typical trachystreptoform sculpture, i.e., carinate ( Fig. 12D–F ); 48 podous rings; distomesal coxal spine (mcs) long, directed distoapicad ( Fig. 13C ) .................................................. ............................................................................................................. A. leptoptilos Enghoff sp. nov.

Figures

Fig. 3. Trachystreptoforms from the Udzungwa Mts.A. Attemsostreptus reflexus Akkari & Enghoff, 2019, ♂ (Mwanihana, Njokamoni, NHMD 621851). B. Same, close-up of gonopod in situ. C. Attemsotreptus julostriatus Enghoff sp. nov., holotype, ♂ (NHMD 621878). D. Attemsostreptus leptoptilos Enghoff sp. nov., paratype, ♂ (NHMD 621877). E–F. Lophostreptus tersus (Cook, 1896). E. Two living females from Magombera Nature Reserve (NHMD 1184642). F. Male from Magombera Nature Reserve (NHMD 1184640). G. Lophostreptus magombera Enghoff sp. nov., paratype, ♂ (NHMD 621886). H. Udzungwastreptus marianae gen. et sp. nov., paratype, ♂ (NHMD 621893). Scale bars: A, C–D, F–H = 2 mm; B = 0.5 mm; E not to scale. Photos: S.G. Selvantharan (A–D, F–H), A.R. Marshall (E).

Fig. 7. Attemsostreptus reflexus Akkari & Enghoff, 2019, male from Udzungwa Mts (Mwanihana, Njokamoni, NHMD 621851). A. Gonopods except right telopodite, anterior view; inset: close-up of mesal coxal spines. B. Tip of left telopodite. C–D. Tip of right telopodite. E–G. Right telopodite. E. Sublateral view.F. anterior view; striped rectangle: area obscured by mounting tape.G. Posterior view. Abbreviations: atp = antetorsal process (highlighted in yellow in F); ba = basomere; lap = lateroapical metaplical process; map = mesapical metaplical process; mcs = mesal coxal spine; mp = metaplica; mr = metaplical “roof”; pp = proplica; px = paracoxite; sl = serrate lamella; slm = solenomere. Scale bars: A, E–G = 0.2 mm; B–D = 0.05 mm.

Fig. 8. Attemsostreptus cataractae Enghoff sp. nov., holotype, ♂ (VMNH 112021). A–C. Midbody rings. A. Four rings with legs. B. Close-up of metazonite and posterior part of prozonite. C. Closeup of prozonite and anterior part of metazonite. D–G. Right gonopod. D. Anterior view. E. Anteriormesal view. F. Distal part of telopodite. G. Tip of telopodite. Abbreviations: atp = antetorsal process (highlighted in yellow in D);lap = lateroapical metaplical process; map = mesapical metaplical process; mp = metaplica; mr = metaplical “roof”; oz = ozopore (hard to see); pp = proplica; px = paracoxite; sl = serrate lamella; slm = solenomere. Scale bars: A = 1 mm; B–F = 0.2 mm; G = 0.05 mm.

Fig. 9. Attemsostreptus julostriatus Enghoff sp. nov., paratype, ♂ (NHMD 621879). A. Collum and part of ring 2, lateral view. B. Two midbody rings, lateral view. C–D. Midbody ring, details of sculpture. C. Posterior part of prozonite, lateral view. D. Dorsal view. E–G. Telson and last two rings. E. Lateral view. F. Dorsal view. G. Posterior view. Scale bars: A–B, E–G = 0.5 mm; D = 0.2 mm; C = 0.05 mm.

Fig. 11. Attemsostreptus julostriatus Enghoff sp. nov., paratype, ♂ (NHMD 621879), right gonopod. A. In toto, anterior view. B. Detail of telopodite. C. Lateroapical view. D. Mesanterior view. Abbreviations: atp = antetorsal process (highlighted in yellow in A, C and D); lap = lateroapical metaplical process; mcs = mesal coxal spine; mp = metaplica; mr = metaplical “roof”; pp = proplica; px = paracoxite; sl = serrate lamella; slm = solenomere; st = sternum. Scale bars: A, C–D = 0.2 mm; B = 0.1 mm.

Fig. 12. Attemsostreptus leptoptilos Enghoff sp. nov., paratype, ♂ (NHMD 621877). A. Head and collum, anterior view. B. Head, collum and ring 2, lateral view. C. Telson and ultimate ring, lateral view. D. Midbody rings, lateral view. E. Detail of D. F. Midbody rings, oblique dorsolateral view. G. Detail of D; left inset: close-up of scalelike microsculpture; right inset: close-up of beaded anterior part of a ridge. H. Telson, dorsal view. I. Telson and ultimate ring, posterior view. Abbreviations: av = anal valve; oz = ozopore; pr = preanal ring. Scale bars: A–D, F = 0.5 mm; E, H–I = 0.2 mm; G = 0.1 mm.

Fig. 13. Attemsostreptus leptoptilos Enghoff sp. nov., paratype, ♂ (NHMD 621877). A–B. First pair of legs. A. Posterior view. B. Ventral view. C. Right gonopod coxa, anterior view. D–E. Right gonopod telopodite (proximal part missing). D. Mesal view. E. Mesobasal view. F. Close-up of telopodite tip. Abbreviations: atp = antetorsal process (highlighted in yellow in E); cxs = coxosternal setae; lap = lateroapical metaplical process; mcs = distomesal coxal spine; mp = metaplica; mr = metaplical “roof”; pfl = prefemoral lobe; pp = proplica; px = paracoxite; sl = serrate lamella; slm = solenomere. Scale bars: A–B = 0.1 mm; C–E = 0.2 mm; F = 0.05 mm.