Mountains of millipedes. The family Odontopygidae in the Eastern Arc Mountains of Tanzania (Diplopoda, Spirostreptida) Author Enghoff, Henrik FB09A817-000D-43C3-BCC4-2BC1E5373635 Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK- 2100 Copenhagen Ø, Denmark. henghoff@snm.ku.dk text European Journal of Taxonomy 2022 2022-03-14 803 1 136 http://dx.doi.org/10.5852/ejt.2022.803.1691 journal article 20167 10.5852/ejt.2022.803.1691 af09c8e1-b481-4de0-b9d0-83ba26bf9876 2118-9773 6359066 8B66C8AE-F00A-42F6-9641-26B0ECC49F78 Spinotarsus axeli sp. nov. urn:lsid:zoobank.org:act: 9B6978B5-2771-4984-AE66-A93A2C07E764 Figs 3A , 4A , 54–55 Diagnosis Differs from other species of Spinotarsus by the huge, slightly curved spine ( LCS ) which is directed latero-basad. Etymology After Axel Kristen Enghoff (1924–2014), the author’s father and ‘landlord’ of ‘Hotel Dolichoiulus’. Material examined (total 3 ♂♂ ) Holotype TANZANIA • ♂ ; Shikurufumi FR ; 37°31′ E , 7°09′ E ; Sep. 2000 ; Uluguru Mountains Biodiversity Conservation Project , Nike Doggart leg.; submontane forest ; NHMD 621761 . Paratypes TANZANIA • 2 ♂♂ ; same collection data as for holotype; NHMD 621762 . Description (male) SIZE. Length 68–70 mm , diameter 4.6–5.1 mm , 57–59 podous rings, no apodous rings in front of telson. COLOUR. After 18 years in alcohol all whitish. SUPRALABRAL SETAE. 6–7. MANDIBULAR STIPES. Shallowly concave. ANAL VALVES. With large dorsal spine and distinct ventral ‘corner’; margins barely raised, three sessile setae on each. LIMBUS ( Fig. 54D ). Margin with slender pointed-triangular lobes, ca twice as long as broad. LEGS. Postfemoral and tibial pads present from leg-pair 6 backward, diminishing and eventually disappearing. FIRST PAIR OF LEGS ( Fig. 54E–G ). Prefemoral lobes broadly rounded-triangular in ventral view. A single coxosternal seta ( CXS ) close to lateral margin of coxosternum, well separated from prefemoral lobes. Prefemoral setae/sensilla indistinct. STERNUM 9 ( Fig. 54H ). Triangular. GONOPOD COXA ( Fig. 54A–C ). With a huge latero-basad, slightly curved spine ( LCS ). Proplical lobe ( PPL ) not covered. Metaplica with a large metaplical flange ( MF ) and more distally, a semi-circular lobe ( ml ). Fig. 54. Spinotarsus axeli sp. nov. , holotype, ♂ (NHMD 621761). A–C . Left gonopod coxa. A. Anterior (-mesal) view. B. Posterior view. C. Mesal view. D . Midbody dorsal limbus. E–G . First pair of legs. E. Anterior view. F. Ventral view. G. Sublateral view. H . Sternum 9. Abbreviations: CXS =coxosternal seta; LCS = lateral coxal spine; MF =metaplical flange; ml =metaplical lobe; PPL =proplical lobe. Scale bars: A–C, E–F = 0.2 mm; G–H= 0.1 mm; D =0.01 mm. Fig. 55. Spinotarsus axeli sp. nov. , holotype, ♂ (NHMD 621761), left gonopod telopodite. A . Anterior view, inset: tip of telomere. B .Posterior view. C . Venral view. D . Dorsal view. E . Anterior-dorso-apical view. F . Posterior-dorsal view. Abbreviations: bla = basal telomeral lamella; BSS =basal solenomeral spine; PN = post-torsal narrowing; PTS =post-torsal spine; SLM =solenomere; TM =telomere. Scale bars =0.2 mm. GONOPOD TELOPODITE ( Fig. 55 ). Arculus 90°. Torsotope compact, almost completely hidden by 1½ coil of very long post-torsal spine ( PTS ). Post-torsal narrowing ( PN ) very pronounced. Solenomere ( SLM ) long, ca same length as telomere, simple, whiplike, coiling irregularly, without outgrowths, with a long straight spine ( BSS ) at base. Telomere ( TM ) with a rounded-rectangular, inconspicuously spinose basal lamella ( bla ), its distal part a broad, longitudinally folded sheet bent into U-shape, narrowing towards tip, one margin near tip with coarse denticles ( Fig. 55A , inset) Distribution and habitat Known only from the Shikurufumi FR in the Uluguru Mts, cf. Doggart et al. (2004) . Remarks The basal lamella ( bla ) which is very inconspicuously spinose (spinules not visible on Fig. 55B ) suggests placement in the large genus Spinotarsus , and no other characters are in conflict with this allocation. Like the only other species of Spinotarsus known from the Eastern Arc Mts, S. fortehamatus Enghoff, 2018 , the new species lacks a darkly sclerotized ridge on the posterior surface of the telomere, a character found in very many congeners. In the key to Spinotarsus species by Kraus (1966) , S. axeli sp. nov. runs without problems to couplet 60, as follows. Couplet 1: Gonopodal metaplica with one or several dark sclerotized lateral spines which stand clearly out in strict oral view → couplet 38: One or more spine(s) (“Postfemoraldorn”) at base of solenomere present → couplet 59: One spine at base of solenomere → couplet 60. Couplet 60 (cf. Enghoff 2018) leads to couplet 65 where the choice is between the lateral metaplical spine being directed more or less apicad, or being horizontal (strictly laterad); however, in S. axeli sp. nov. the lateral spine is directed obliquely laterobasad which seems to be unique in the genus.