Yia geminispina, Enghoff, 2016

Enghoff, Henrik, 2016, A mountain of millipedes V: three new genera of Odontopygidae from the Udzungwa mountains, Tanzania (Diplopoda, Spirostreptida, Odontopygidae), European Journal of Taxonomy 221, pp. 1-17 : 10-13

Yia geminispina gen. et sp. nov.

urn:lsid:zoobank.org:act:0861F871-FE89-4563-9C19-5F1A95D2B4C1

Figs 5–6

Diagnosis

(redundant, genus monotypic)

Etymology

The name is a composite Latin noun in apposition meaning “twin spine” and refers to the pair of long spines on the telomere.

Material studied (total: 1 ♂)

Holotype TANZANIA: ♂, Udzungwa Mts., Chita Forest Reserve [actually: Udzungwa Scarp F.R. ], 1100 m, 25 Oct. 1984, M. Stoltze & G. Petersen leg. ( ZMUC00047001 ).

Description (male)

SIZE. Length ca 4 cm, diameter 2.6 mm, 49 podous rings, no apodous rings in front of telson.

COLOUR. Faded, very faint traces of a broad, light dorsal stripe.

HEAD. Without peculiarities.

COLLUM. With a marginal and a submarginal furrow.

BODY RINGS ( Fig. 5A ). Almost perfect cylinders, not vaulted; suture with an extended, shallow anteriad sinus below ozopore level; ozopores ca three diameters behind suture.

ANAL VALVES. Each with a long, curved dorsal spine; marginal rim slightly raised, setiferous tubercles slightly protruding in a laterad direction (i.e., on very small ‘ravelins’).

OZOPORES. Starting from ring 6.

LIMBUS ( Fig. 5E ). With simple, slender-triangular lobes. Surface of lobes longitudinally microstriate.

MALE LEGS. With postfemoral and tibial ventral pads in anterior half of body, except for first few legpairs.

GONOPOD COXA ( Fig. 5 B–D). Slender and almost parallel-sided in anterior view. Proplica (pp) simple, proplical lobe (prl) not covered. Metaplica (mp) with low, right-angled flange (mf), above arculus with transverse shelf (ms), laterally with triangular process (lp), apically forming a small hood, or cucullus (cu). A curved spine (msp) originating between ms and cu.

GONOPOD TELOPODITE ( Fig. 6 ). Arculus 90°. Torsotope (tt) simple, compact, without processes ( Fig. 6B ). Posttorsal narrowing (pn) without processes or spines. Telopodite just distal to posttorsal narrowing dividing into solenomere and telomere. Solenomere (slm) long, simple, whiplike, ca as long as telomere. Proximal part of telomere (tlm) roughly broadly triangular; two very long, curved spines (ts1, ts2) arising from small lobe on basal side of telomere, close to the origin of the solenomere; distal part of telomere drawn out into very long, very slender process (tdp), one edge of tdp with a row of long, Y- or I-shaped spikes; tip of tdp complicated micro-spinose.

Distribution and habitat

Known only from the type locality.

Coexisting species

No other odontopygids were present in the sample containing the unique holotype, but a number of other species have been recorded from Udzungwa Scarp F.R.: Chaleponcus circumvallatus Enghoff, 2014 , C. hamerae Enghoff, 2014 , C. nikolajscharffi Enghoff, 2014 , Aquattuor sterosathe Enghoff, 2015 , A. udzungwensis Enghoff, 2015 , Prionopetalum asperginis Enghoff , 20XX and Casuariverpa scarpa gen. et sp. nov.

Figures

Fig. 5. Yia geminispina gen. et sp. nov., holotype. A. Part of midbody showing the characteristic course of the suture and the position of the ozopore (highlighted in red on one body ring). B–D. Left gonopod coxa. B. Anterior-mesal view. C. Posterior view. D. Mesal view, close-up. E. Limbus. Abbreviations: cu = cucullus, lp = lateral coxal process, mf = metaplical flange, mp = metaplica, ms = metaplical shelf, msp =metaplical spine, pp = proplica, prl = proplical lobe. Scales: A = 1 mm; B–D = 0.1 mm; E = 0.005 mm.

Fig. 6. Yia geminispina gen. et sp. nov., holotype. Left gonopod telopodite. A. Posterior, slightly basal view. B. Anterior, slightly basal view. C. Anterior, slightly basal view. D. Basal view. E–F. Detail of margin of telomere. F. Tip of telomere. Abbreviations: ba = basomere, pn = post-torsal narrowing, slm = solenomere, tdp = telomeral distal process, tlm = telomere, ts1, ts2 = telomeral spines, tt = torsotope. Scales: A–D = 0.1 mm; F = 0.05 mm; E = 0.005 mm.