Calyptomastix ingemanni, 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 : 25-29

Calyptomastix ingemanni sp. nov.

urn:lsid:zoobank.org:act:E2D6F8CA-F6F2-45AC-80F9-21D80EB6A698

Figs 1 , 14–16

Diagnosis

Differs from other species of Calyptomastix by the combination of having a post-torsal spine (= postfemoral spine of Hoffman & Howell 2012) lacking a proper lateral metaplical process but instead having a more apical posteriad triangular process and a small fingerlike process in the cavity of the cucullus.

Etymology

After my grandson Ingemann Andreas Enghoff Mogensen.

Material examined (total 2 ♂♂)

Holotype TANZANIA • ♂; Kilimanjaro Region, Mwanga District, North Pare mountains , Kiverenge FR; 03°48′41.0″ S, 37°38′52.5″ E; 1563 m a.s.l.; 14 May 2011; S. Frederiksen leg.; NHMD 621715 .

Paratype TANZANIA • 1 ♂; same collection data as for holotype; NHMD 621716 .

Description (male)

SIZE. Length 45–47 mm, diameter 2.6–2.8 mm, 68–69 podous rings, no apodous rings in front of telson.

COLOUR. Uniform dark grey, posterior part of metazonites amber, a dorsal yellow stripe. Head except clypeal region, collum, antennae and preanal ring dark brownish grey; clypeal region and anal valves reddish brown. Legs yellowish.

SUPRALBRAL SETAE. 4.

MANDIBULAR STIPES. With triangular disto-ventral lobe, distal margin hence concave.

ANAL VALVES. With very small dorsal spine, no ventral spine or corner, margins not raised, each with 3 sessile setae.

LIMBUS ( Fig. 15F ). With rounded-triangular, striate lobes.

LEGS. Postfemoral and tibial pads on post-gonopodal legs, pads diminishing and eventually disappearing towars posterior end.

FIRST PAIR OF LEGS ( Fig. 14A–C ). Prefemoral lobes relatively long, slender-triangular in ventral view. Two to three coxosternal setae (CXS) close to lateral margin of coxosternum, well separated from prefemoral lobes. Prefemora with two short mesapical setae (APS) and a scattering of peglike sensilla (LPS) extending to tip of prefemoral lobe.

STERNUM 9 ( Fig. 14D ). In the shape of a transverse, parallel-sided, slightly curved band.

GONOPOD COXA ( Fig. 15A–E ). Proplica (PP) slender, almost parallel-sided, simple, with a relatively large proplical lobe (PPL) distally. Metaplica (MP) simple, without a basal metaplical flange, subdistally with a posteriad, pointed triangular process (mtp). Cucullus (CU) apically with slender, fingerlike process (fp) facing proplical lobe.

GONOPOD TELOPODITE ( Fig. 16 ). Arculus 90º. Torsotope (TT) extended, post-torsal narrowing (PN) not very pronounced. A long, stout post-torsal spine (PTS) making more than a full turn around post-torsal

area. Solenomere (SLM) slender, simple, relatively short, all but completely hidden within telomere, tip fluted. Telomere (TM) in anterior and basal views ( Fig 16B, D ) appearing as a simple, oblong, distally expanded structure (in outline vaguely resembling the cartoon character Horace Horsecollar); in posterior, ventral, and mesal views ( Fig. 16A, E, C ) with several convoluted membranes, among which the tip of the solenomerite sticks out.

Distribution

Known only from the type locality in the North Pare Mts.

Remarks

The small fingerlike process (fp) facing the proplical lobe reminds of the condition in several species of the genus Helicochetus Attems, 1909 , see, e.g., Enghoff (2016: figs 5–6). The telopodites of the two genera are, however, vastly different.

Figures

Fig. 1. Calyptomastix ingemanni sp. nov., paratype (NHMD 621716), to show typical odontopygid habitus. Scale bar = 1 cm. Photo S.G. Selvantharan.

Fig. 14. Calyptomastix ingemanni sp. nov., holotype, ♂ (NHMD 621715). A–C. First pair of legs. A. Sublateral view. B. Anterior view. C. Ventral view. D. Sternum 9. Abbreviations: APS=mesapical prefemoral setae; CXS =coxosternal setae; LPS =lateral prefemoral setae. Scale bars: A=0.1 mm; B–D =0.2 mm.

Fig. 15. Calyptomastix ingemanni sp. nov., holotype, ♂ (NHMD 621715). A–E. Right gonopod coxa. A. Anterior view. B. Mesal view. C. Posterior view. D. Lateral view. E. Cucullus. F. Midbody dorsal imbus.Abbreviations:CU = cucullus;fp = fingerlike process; MP=metaplica; mtp =metaplical triangular process; PP =proplica; PPL =proplical lobe. Scale bars: A–D=0.2 mm; E =0.02 mm; F =0.01 mm.

Fig. 16. Calyptomastix ingemanni sp. nov., holotype, ♂ (NHMD 621715), right gonopod telopodite. A. Posterior view.B. Anterior view.C. (Sub)mesal view.D. Basal (dorsal) view.E. Apical (ventral) view. Abbreviations: PN =post-torsal narrowing; PTS =post-torsal spine; SLM =solenomere; TM = telomere; TT =torsotope. Scale bars =0.1 mm.