Xystopyge doggartae, Enghoff, 2022

Enghoff, Henrik, 2022, Mountains of millipedes. The family Odontopygidae in the Eastern Arc Mountains of Tanzania (Diplopoda, Spirostreptida), European Journal of Taxonomy 803, pp. 1-136 : 109-113

Xystopyge doggartae sp. nov.

urn:lsid:zoobank.org:act:5228A21E-9964-4B1B-A536-CD37E6B578CB

Figs 66–68

Diagnosis

Differs from other species of Xystopyge by the combination of a hammerlike profile of the distal part of the gonopod coxa in certain views ( Fig. 67B–C ) (shared only with X. martella and X. bentemarieae sp. nov.), a very long, slender-triangular gonopod sternum (shared with X. martella and a few other species, but not with X. bentemarieae sp. nov.), a very stout, strongly curved hook (th) at midlength of the gonopod telomere (smaller and not so strongly curved in X. martella and X. bentemarieae sp. nov.), a very strong basal solenomeral spine (BSS) (only a small tubercle at this place in X. martella , nothing in X. bentemarieae sp. nov.) and a distal division of the solenomere into two branches (undivided in X. martella ).

Etymology

After the collector, Nike Doggart.

Material examined (total 1 ♂)

Holotype TANZANIA • ♂; Morogoro Region, Morogoro District, Kasanga FR ; 37°45′ E, 7°10′ S; 700–900 m a.s.l.; 27 Jul.–2 Aug. 2000; Nike Doggart leg.; Uluguru Mountains Biodiversity Conservation Project; lowland submontane forest, taken from leaf litter and rotting logs; NHMD 621768 .

Description (male)

(Only the head and the first 18 body rings are present)

SIZE. Diameter 2.5 mm.

COLOUR. Quite faded after 20 years in alcohol; a broad dorsal pale stripe still evident.

SUPRALABRAL SETAE. 5.

MANDIBULAR STIPES. With large disto-ventral lobe, distal margin shallowly concave.

LIMBUS ( Fig. 66D ). Margin with smooth, rounded, finger-shaped lobes.

LEGS. With tibial pads from leg-pair 6; post-gonopodal legs with postfemoral as well as tibial lobes, at least until body ring 18.

FIRST PAIR OF LEGS ( Fig. 66A–B, E ). Prefemoral lobes short, triangular in ventral view. Three to four long coxosternal setae (CXS) adjacent to lateral side of prefemoral process; prefemur with a few peglike mesapical sensilla (APS) and ca 10 peglike lateral sensilla (LPS).

GONOPOD STERNUM (STERNUM 8) ( Fig. 66C ). Long, narrow triangular.

STERNUM 9 ( Fig. 66F ). Pentagonal.

GONOPOD COXA ( Fig. 67 ). Rather massive. Proplica (PP) simple, proplical lobe (PPL) clearly visible in anterior view. Metaplica (MP) at level of proplical lobe produced mesad into two subsemicircular lobes, one (mpv) vertical and one (mpo) oblique to almost horizontal; distally produced into complex structure with a large, pointed, curved, posteriad process (mpp) and a meso-anteriad, subrectangular process (map) carrying a long, slender straight extension (sx) at its meso-posterior corner and a short retrose extension (rx) at its latero-anterior corner.

GONOPOD TELOPODITE ( Fig. 68 ). Arculus 135°. Torsotope (TT) not very well delimited. Solenomere (SLM) at rest concealed within gutter formed by telomere; ca as long as telomere; at base with a large,

stout, curved spine (BSS); ca at ⅔ from base dividing into a shorter, microstriate branch (sdl) with the opening of the efferent canal, and a longer, slender, smooth, curved spinelike branch (sdp). Telomere (TM) overall consisting of a ribbon describing a full circle and at the same time folded lengthwise forming a concavity along the inner side of the circle, with a very stout, strogly curved, smooth hook (th) ca at mid-length followed a hyaline, triangular lamella (ttl); interior surface of telomere at least partly microspiculate ( Fig. 68F ).

Distribution and habitat

Known only from the type locality where it was taken from leaf litter and rotting logs lowland submontane forest. See Doggart et al. (2004) for information on this area.

Remark

Found in the same sample as X. proplicatus Frederiksen & Enghoff, 2012 (see below).

Figures

Fig. 66. Xystopyge doggartae sp. nov., holotype, ♂ (NHMD 621768). A–B, E. First pair of legs. A. Anterior view. B. Sublateral view. E. Ventral view. C. Gonopod sternum (sternum 8). D. Midbody dorsal limbus. F. Sternum 9. Abbreviations: APS=mesapical prefemoral sensilla; CXS =coxosternal setae; LPS =lateral prefemoral sensilla. Scale bars: A–C, E–F =0.1 mm; D =0.005 mm.

Fig. 67. Xystopyge doggartae sp. nov., holotype, ♂ (NHMD 621768), left gonopod coxa. A. Anterior view. B. Mesal view.C. Lateral view.D. Posterior view.E. Apical view.Abbreviations:map =metaplical anterior process; MP =metaplica; mpo = metaplical oblique lobe; mpp =metaplical posterior process; mpv =metaplical vertical lobe; PP =proplica; PPL =proplical lobe; rx =retrorse extension of map; sx =straight extension of map. Scale bars =0.1 mm.

Fig. 68. Xystopyge doggartae sp. nov., holotype, ♂ (NHMD 621768), left gonopod telopodite. A.Anterior view. B. Posterio-lateral view. C. Dorsal view. D, F. Distal part of solenomere resting in telomere gutter. E. Posterior view. G. Ventral view. H. Close-up of opening of efferent canal. Abbreviations: BSS =basal solenomeral spine; sdl =solenomeral distal microstriate branch; sdp = solenomeral distal spinelike branch; SLM=solenomere; th = telomeral hook; TT =torsotope; ttl = telomeral triangular lamella. Scale bars: A–C, E, G=0.1 mm; D, F = 0.05 mm; H =0.01 mm.