Calyptomastix xystopygoides, 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 : 31-34

Calyptomastix xystopygoides sp. nov.

urn:lsid:zoobank.org:act:0F641CA1-EB6E-4EB4-82A4-0BE936074D2E

Figs 19–20

Diagnosis

Differs from other species of Calyptomastix by having the post-torsal spine straight and directed laterad, by having the telomere more slender and curved in a Xystopyge -like way, and having a spinelike lobe on the subdistal ectal surface of the telomere.

Etymology

Named after the superficial gonopodal similarity with species of the genus Xystopyge . Adjective.

Material examined (total 1 ♂)

Holotype TANZANIA • ♂; Tanga Region, East Usambara Mts, Amani ; 5°5.7′ S, 38°38′ E; 950 m a.s.l.; 27 Oct.– 9 Nov. 1995; C.E. Griswold, N. Scharff and D. Ubick leg.; forest; NHMD 621718 .

Description

SIZE. Length 45 mm. Diameter 2.5 mm. 63 podous rings, no apodous rings in front of telson.

COLOUR. After 26 years in alcohol faded to light grey with irregular black blotches; posterior parts of metazonites amber; with faint traces of a pale mid-dorsal stripe.

SUPRALABRAL SETAE. Not countable due to damage.

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

ANAL VALVES. Each with a very small dorsal spine, an even smaller ventral one and three setae on slightly raised margins.

LIMBUS ( Fig. 19D–E ). Dorsal and lateral limbus worn, appearing as with rounded-triangular lobes. Ventrolateral limbus with very slender, spinelike lobes. (There may be considerable differences in limbus structure between the dorsal, lateral and ventrolateral parts of a body ring, see Schmidt 1962: figs 1–2.)

LEGS. With small postfemoral and tibial pads on anterior postgonopodal legs; pads decreasing in size and absent from midbody backward.

FIRST PAIR OF LEGS ( Fig. 19A–C ). Prefemoral lobes rounded-triangular in ventral view. Four coxosternal setae (CXS) close to lateral margin of coxosternum, well separated from prefemoral lobes. Prefemora with one or two short mesapical setae (APS) and four to five lateral setae (LPS).

STERNUM 9. Lost during dissection.

GONOPOD COXA ( Fig. 19F–I ). Rather compact, with a large lateral spine (LCS) directed obliquely apicad. Distal part of proplica (PP) overlaid by rounded-rectangular anterior lobe of metaplica (MP), proplical lobe hence not visible. Cucullus (CU) very small, carrying a long, slender, overall straight but basally curved spine (cus) directed obliquely posteriad. Posterior surface with a hemisphaerical hump (hh).

GONOPOD TELOPODITE ( Fig. 20 ). Arculus 90°. Torsotope (TT) extended, with semicircular torsotope lobe (TL). Post-torsal narrowing (PN) moderately pronounced. A very long, straight post-torsal spine directed laterad, i.e., towards arculus. Solenomere (SLM) with a stout, basal spine (BBS); apart from basalmost part slender, whiplike, almost completely hidden inside telomere, only a small, obliquely ridged part of the distal half visible ( Fig. 20E ), tip (not visible on Fig. 20 ) simple, pointed. Telomere (TM) slender, tightly rolled around solenomere and in addition forming a regular, almost 180° curve; distally expanded into sub-rectangular sheet, subdistall with a spinelike lobe (tml) originating from ectal surface.

Figures

Fig. 19. Calyptomastix xystopygoides sp. nov., holotype, ♂ (NHMD 621718). A–C. First pair of legs. A. Sublateral view. B. Anterior view. C. Ventral view. D. Midbody dorsal limbus (worn). E. Midbody ventrolateral limbus. F–I. Left gonopod coxa. F. Anterior view. G. Anterior-lateral view. H. Posteriormesal view. I. lateral view. Abbreviations: APS =mesapical prefemoral setae; CU = cucullus; cus = cucullar spine; CXS =coxosternal setae; hh =hemisphaerical hump; LCS= lateral coxal spine; LPS =lateral prefemoral setae; MP=metaplica; ms =metazonital striae; PP =proplica, Scale bars: A–C, F–I =0.1 mm; D–E=0.02 mm.

Fig. 20. Calyptomastix xystopygoides sp. nov., holotype, ♂ (NHMD 621718), left gonopod telopodite. A. anterior-mesal view. B. Posterior view. C. Ventral view. D. Dorsal view. E. Detail of telomere and ridged solenomere. Abbreviations: BSS =basal solenomeral spine; PN =post-torsal narrowing; SLM =solenomere; TL =torsotope lobe; tml =telomeral spinelike lobe; TT=torsotope; PTS = post-torsal spine. Scale bars: A–D =0.2 mm; E =0.05 mm.