Morogorius divisus Enghoff, 2025

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 : 218-223

Morogorius divisus Enghoff sp. nov.

urn:lsid:zoobank.org:act:48AFBD40-57E0-4F1B-9F58-ABF792FFE13E

Figs 1 , 2A , 3–6

Diagnosis

Differs from other species of Morogorius by the deep division of the parasolenomere (ps) into two long, subequal lobes ( Fig. 6A ) and by the very poorly developed coxal process ( Fig. 5C ).

Etymology

Named after the deeply divided parasolenomere. Adjective.

Material examined (total 11 ♂♂, 11 ♀♀)

Holotype

TANZANIA • ♂; Iringa Region, Kilolo District, Udzungwa Scarp Nature Reserve, Uhafiwa ; 8°31′58.404″ S, 35°51′28.368″ E; 1375 m a.s.l.; 25 Jan. 2022. A. Ngute, R. Malanda, W. Mhagawale, H. Mnendendo, A. Mpoto and A. Marshall leg.; FoRCE Plot 106, open canopy; COLL.NHMD - ACC. NO. 2022-EN-003; NHMD 1184703.

Paratypes

TANZANIA – Iringa Region, Kilolo District, Udzungwa Scarp Nature Reserve • 8 ♂♂, 7 ♀♀; same data as for holotype; NHMD 1184699, NHMD 1184701, NHMD 1184702 • 2 ♂♂, 2 ♀♀; same data as for holotype; Uhafiwa ; 8°31′49.296″ S, 35°51′20.772″ E; 1354 m a.s.l.; 24 Jan. 2022; FoRCE Plot 107, open canopy; NHMD 1184704 to NHMD 1184706 • 2 ♀♀; Chita Juu ; 8°32′23.388″ S, 35°51′36″ E; 1387 m a.s.l.; 1 Feb. 2022; A. Ngute, R. Malanda, W. Mhagawale, H. Mnendendo, A. Mpoto and A. Marshall leg.; FoRCE Plot 109, open canopy; COLL.NHMD - ACC.NO. 2022-EN-003; NHMD 1184708, NHMD 1184709 .

Description (males)

SIZE. Length 24–27 mm, max. width 4.4–4.8 mm.

COLOUR ( Fig. 2A ). After 2 years in alcohol head, collum and most of dorsum reddish-brown. Paranota of rings 2, 5, 7, 9–10, 12–15 and 15–19 contrastingly white, like epiproct and paraprocts. Antennae, venter and legs light brown; antennomeres 1 and 5–7 whitish.

COLLUM ( Fig. 3A, C ) with a row of 4 setae close to anterior margin.

BODY RINGS ( Fig. 3C, E–H ). Metazonites 1.7–1.8 × as broad as prozonites, with 1+1 small, thin setae anteriorly and a prominent transverse sulcus from ring until ring 17 or 18, granulation regular also behind sulcus. Paranota rectangular until ring 13 or 14, thereafter posterior corners projecting increasingly backwards, triangular, those of rings 16–18 with a few denticles at base of mesal margin. Anterior spiracle (asp) on each body ring pear-shaped, posterior spiracle (pop) subcircular, both with plugs showing a very pronounced cellular pattern ( Fig. 3G ). Ozopores ( Fig. 3E, H ) in smooth peritremata (pe) on edge of paranota, ca midway between anterior and posterior margin. Sides of rings with a row of slightly larger tubercles along posterior margin.

LEGS ( Fig. 4C–D ). Length 1.3× maximum body width.

GONOPODS ( Figs 5–6 ). Coxa (cx) with a barely discernible apical process (cxp), with two long setae (as) a on anterior surface field of ca a dozen setae (ls) on lateral surface. Prefemoral part (prf) ca 2 × as long as broad. Prefemoral process (prp) closely appressed to and distally curving over solenomere; prp slender in basal 2/3, distally expanded and ending in two tines. Solenomere (slm) long, slender, taeniate with parallel margins, at ca 4/5 of its length abruptly narrowed from ventral side; apical 1/5 thin, tapering. Parasolenomere (ps) deeply divided into two branches; ventral branch ca 3/4 as long as solenomere, slender; dorsal branch slightly shorter and broader, apically strongly tapering.

Distribution and habitat

Only known from three sites in the Udzungwa Scarp Nature Reserve ( Fig. 1 ). Collected under open canopy at 1354–1387 m a.s.l.

Figures

Fig. 1. Map of the Udzungwa Mts showing collecting areas for Chelodesmidae Cook, 1895. Yellow squares: Morogorius spp.D: M. divisus Enghoff sp. nov.,L: M. louishanseni Enghoff sp. nov., P: M. pugio Enghoff sp. nov. K: M. kitungulu Enghoff sp. nov., C: M. cochlear Enghoff sp. nov. Red squares: Tanzaniella howelli Hoffman, 1977. Blue squares Dionaeadesmus force Enghoff gen. et sp. nov. Purple squares: Callistocilla dolorotrix Hoffman, 2005. The position of the squares within the green circles/ ovoids does not indicate exact location. Based on Marshall et al. (2010: fig. 1).

Fig. 2. Chelodesmids from the Udzungwa Mts. A. Morogorius divisus Enghoff sp. nov., paratype, ♀ (NHMD 1184699). B. Morogorius louishanseni Enghoff sp. nov., paratype, ♂ (NHMD 1184563). C–D. Tanzaniella howelli Hoffman, 1977. C. Freshly preserved specimen (uncatalogued). D. Female from Mwanihana (NHMD 1184730). E. Dionaeadesmus force Enghoff gen. et sp. nov., paratype, ♀ (NHMD 1184572), rings 11–13 missing. F. Callistocilla dolorotrix Hoffman, 2005, male from Udzungwa Scarp Nature Reserve (NHMD 1184742). Scale bars: A–B, D–F = 2 mm; C not to scale. Photos: S.G. Selvantharan (A–B, D–F), A.R. Marshall (C).

Fig. 3. Morogorius divisus Enghoff sp. nov., paratype, ♂ (NHMD 1184702). A. Head, right antenna, collum and rings 2–3, oblique view.B. Clypeus and labrum. C. Head, collum and rings 2–3, dorsal view. D. Microsculpture of prozonite, ring 9. E. Ring 9, dorsal view. F. Rings 8–9, lateral view. G. Stigmata of ring 8, lateral view. H. Left paranotum and ozopore of ring 9, lateral view. Abbreviations: asp = anterior spiracle; eg = epicranial groove; lg = labrogenal offset; pe = peritreme with ozopore; pop = posterior spiracle; ts = transverse sulcus. Scale bars: A, C, E–F = 0.5 mm; B, G–H = 0.1 mm; D = 0.05 mm.

Fig. 4. Morogorius divisus Enghoff sp. nov., paratype, ♂ (NHMD 1184702). A. Telson, ventral view. B. Tip of preanal process (epiproct) with spinnerets, posterior view. C–D. Right leg 10, anterior views. E. Sterna 11–12. F. Midbody dorsal limbus. Abbreviations: ds = dorsal seta on anal valve; ep = epiproct; gs = globular swelling; hp = subanal scale (hypoproct); pp = anal valve (paraproct); vs = ventral seta on anal valve. Scale bars: A, C–E = 0.5 mm; B = 0.05 mm; F = 0.02 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.