Attemsostreptus julostriatus Enghoff, 2024

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 : 15-19

Attemsostreptus julostriatus Enghoff sp. nov.

urn:lsid:zoobank.org:act:DD71B6EC-7243-4F22-B13F-E6CA213A0352

Figs 2 , 3C , 9–11

Diagnosis

Differs from congeners, except A. leptoptilos sp. nov., by the relatively short (<half length of gonopod coxa), pronouncedly basad lateroapical metaplical process (lap). Differs from A. leptoptilos by having more podous rings (58–62 vs 48), by having the metazonites striate as in species of Julidae Leach, 1814 , vs carinate as in other trachystreptoform spirostreptids, and by having the mesapical coxal spines (mcs) very short and pointing distad vs much longer and pointing distomesad.

Etymology

The name refers to the shallow metazonital striation, which reminds more of the sculpture seen in members of the Palaearctic family Julidae than of other trachystreptoform spirostreptids. Adjective.

Material examined (total 3 ♂♂, 3 ♀♀)

Holotype

TANZANIA • ♂; Iringa Region, Kilolo District, Kilombero Nature Reserve , Ndundulu , Luvalo (“Luala”); 07°46′00.4″ S, 36°29′32.2″ E; 1903 m a.s.l.; 26 Oct. 2021; A. Ngute, R. Malanda, W. Mhagawale, A. Mpoto, A. Marshall leg.; FoRCE Plot 70, closed canopy; COLL.NHMD - ACC.NO. 2022-EN-003; NHMD 621878 .

Paratypes

TANZANIA – Iringa Region • 1 ♂; Udzungwa Mountains, Ndundulu Forest , Waller’s Camp ; 07°46′ S, 36°29′ E; 1550 m a.s.l.; 1–12 Jan. 2007; L.A. Hansen and local assistants leg.; tropical semi-evergreen forest; NHMD 621879 • 1 ♂; Mahenge District, West Kilombero Scarp Forest Reserve , Ndundulu Mountains ESE, Udekwa village ; 07°44′37″ S, 36°27′ E; 1700 m a.s.l.; Mar.–Apr. 1993; L.L. Sørensen leg.; in rotten wood; NHMD 621880 .

Referred material, not types

TANZANIA – Iringa region • 3 ♀♀; Mahenge District, West Kilombero Scarp Forrest Reserve , Nyumbanitu Mountains S, Udekwa village ; 07°50′41″ S, 36°20′ E; 1500 m a.s.l.; Dec. 1993; J.O. Svendsen leg.; NHMD 621881 .

Description (males)

SIZE. Length 56–64 mm, diameter 3.3–3.5 mm, 58–62 podous rings, no apodous rings in front of telson. COLOUR ( Fig. 3C ). After 18 months in alcohol overall medium brown, marbled with blackish brown. Head with blackish brown interocular band. Collum with blackish brown margins. Metazonites blackish brown along posterior margin, dorsally with blackish brown zone extending to suture. Telson blackish brown. Legs yellowish brown.

HEAD. Eyes not surpassing antennal sockets medially, with ca 45 ommatidia in 6 horizontal and>10 rather jumbled vertical rows. Antennae reaching back to ring 5–6. Mandibular stipes: distal margin concave.

COLLUM ( Fig. 9A ) Smooth except for 3 lateral carinae. Lateral lobes slightly expanded.

BODY RINGS ( Fig. 9B–D ). Anterior part of prozonites with dense transverse microsculpture which posteriorly gives way to a first irregular, later regular cell structure; in dorsal part of ring surface of last cell row coarsely pitted. The cuticular scutes (“cytoscutes”) of the anterior part of the prozonite are remarkable in being rounded rather than polygonal and being arranged in an imbricate pattern ( Fig. 9C ). Metazonites slightly vaulted, densely striated, but not carinate as in congeners, surface between striae coarsely pitted. Suture between pro- and metazonite simple, straight. Ozopores between two ridges, slightly behind middle of metazonite.

TELSON ( Fig. 9E–G ). As in A. reflexus , A. cataractae sp. nov. and A. leptoptilos sp. nov.

LEGS. Length ca 0.9 × body diameter. Postfemora and tibiae with ventral pads; pads decreasing in size towards posterior and absent from last pairs of legs. First pair ( Fig. 10 ) similar to those in A. reflexus .

GONOPOD COXA ( Fig. 11A, D ). As in A. cataractae sp. nov., with two exceptions: metaplica (mp) with very short oblique distomesal spine (mcs); lateroapical metaplical process (lap) shorter, less than length of coxa, directed basad.

GONOPOD TELOPODITE ( Fig. 11 ). As in A. cataractae sp. nov. and A. leptoptilos sp. nov. The gonopod telopodite illustrated in Fig. 11 has become somewhat distorted during the preparation for SEM. In alcohol-preserved specimens, the position of the telopodite is as in A. cataractae sp. nov. ( Fig. 8D ).

Descriptive notes (females)

Length unmeasurable, all females broken. Diameter 4.2–4.8 mm. 58–60 podous rings, no apodous rings in front of telson. Lateral lobes of collum not expanded. Other non-sexual characters as in male.

Distribution and habitat

Found at several forested sites in the Ndundulu and Nyambanitu Mountains, 1500–1903 m a.s.l. One specimen collected from rotten wood.

Figures

Fig. 2. Map of the Udzungwa Mts showing collection areas for trachystreptoform Spirostreptidae Brandt, 1833. Yellow symbols: Attemsostreptus spp.; dots: A. reflexus, diamond: A. cataractae Enghoff sp. nov., cross: A. leptoptilos Enghoff sp. nov., triangles; A. julostriatus Enghoff sp. nov. Red symbols: Lophostreptus spp.; dots:L. tersus, crosses:L. magombera Enghoff sp. nov. Blue dots:Udzungwastreptus marianae Enghoff gen. et sp. nov. Based on Marshall et al. (2010: fig. 1).

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. 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. 10. Attemsostreptus julostriatus Enghoff sp. nov., paratype, ♂ (NHMD 621879), first pair of legs (right leg broken after prefemur). A. Sublateral view. B. Ventral view. C. Posterior view. D. Detail of prefemoral lobe. Scale bars: A–C = 0.1 mm; D = 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. 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.