Circulocryptus faillei, Golovatch, Sergei I., 2016

Golovatch, Sergei I., 2016, The millipede family Cryptodesmidae in Indochina (Diplopoda, Polydesmida), ZooKeys 578, pp. 33-43: 37-40

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scientific name

Circulocryptus faillei

sp. n.

Taxon classification Animalia Polydesmida Cryptodesmidae

Circulocryptus faillei   sp. n. Figs 8-9, 10-12

Type material.

Holotype ♂ ( MNHN JC 368), Vietnam, Khanh Hoa Prov., Cat Lam Distr., Suoi Cat community, Hon Ba Nature Reserve, road to Alexandre Yersin‘s monument in Hon Ba, 1350-1550 m a.s.l., mountain tropical rainforest, 14.XI.2013, leg. A. Faille (Vn No. 298).


Honours Arnaud Faille, the collector.


Length ca 11 mm, width of midbody pro- and metazonae 1.2 and 2.9 mm, respectively. General coloration in alcohol red, but legs mostly somewhat lighter pink and antennomeres 5-7 increasingly infuscate, red-brown to dark brown (Figs 8, 9).

Body with 20 segments. In width, head << collum < segment 2 < 3 < 4=15; thereafter body rapidly tapering towards telson.

Head behind labrum very densely and clearly microgranulate; epicranial suture superficial, more distinct in vertigial region. Antennae short, clearly clavate (Fig. 9), C-shaped and placed mostly inside a groove; in length, antennomere 3 = 5 = 6 > 4 > 1 = 2 = 7; antennomeres 5 and 6 each with a compact apicodorsal group of bacilliform sensilla. Interantennal isthmus almost twice as broad as diameter of antennal socket. Tegument dull, clearly microgranulate almost throughout, only prozonae more finely shagreened. Dorsum moderately and regularly convex; paraterga mostly set at about upper 1/4 of body, very strongly developed (Figs 8, 9), beginning with collum, usually only slightly declined ventrad. Collum flabellate, completely covering the head from above, clearly radiate only anteriorly (12+12 long, apically setigerous radii), fore margin regularly convex, non-lobulated, but a distinctly and regularly emarginated caudal margin with 5+5 small setigerous lobulations; dorsal surface irregularly beset with small, dense, roundish, setigerous tubercles/knobs (Fig. 8). Postcollum paraterga very broad, each clearly broader than prozona; lateral edge mostly subquadrate, drawn increasingly behind rear tergal margin only in segments 16-19; paraterga 19 produced as far behind as tip of epiproct. Fore margin/shoulder of paraterga straight, with numerous short radii, but lateral and caudal margins slightly, but sufficiently distinctly lobulated, lateral edge with an abbreviated anterolateral and 4 or 5 fully developed lateral lobulations; caudal edge increasingly poorly, but abundantly radiate and lobulate toward base. Mid-dorsal parts of metaterga typically with 3 transverse, more or less regular rows of small, rounded, low tubercles/knobs in front of 5-7+5-7 smaller lobulations forming a regular row at caudal margin between main axis and bases of paraterga; 1-2 rows of dorsal knobs growing increasingly obliterated when extended onto central parabasal parts of paraterga. Each marginal lobulation/radius and tergal tubercle normally surmounted by a short, poorly visible seta, these setae often being obliterated. Neither axial line nor pleurosternal carinae. Ozopores invisible, pore formula untraceable. Stricture dividing pro- and metazonae broad, shallow and microgranulate like adjacent metazonae, but shining. Epiproct (Figs 8, 9) short, conical, subtruncate at apex. Hypoproct (Fig. 9) subtrapeziform, 1+1 caudal setae clearly separated, borne on small knobs.

Sternites narrow (Fig. 9), sparsely setose, moderately impressed along main axis, somewhat or very clearly broadened only between coxae 7 and 9, respectively. Legs unmodified, long, but relatively stout (Figs 8-10), ca 1.4-1.5 times as long as paratergal width (♂); in length, tarsi > femora > prefemora and tibiae > coxae and postfemora (Fig. 10); gonapophyses on coxae 2 small cones (Fig. 9); neither adenostyles nor tarsal brushes. Gonopod aperture subcordiform, caudal and lateral margins slightly elevated (Fig. 9).

Gonopods (Figs 11, 12) very complex, in situ both held parallel to each other (Fig. 9). Telopodite subcircular, very strongly curved caudad, vaguely bipartite, at very base with a short, prefemoral, finger-shaped, trichostele-like process (t). Basal part (b) stout, extended terminally into a long, solid, spiniform, retrorse, laterally curved and densely pilose solenomere (sl), the latter at its base bearing a short, slightly curved, apical process (pr); seminal groove (sg) sigmoid, mostly running on lateral face of b, this being evidence of b torsion. Acropodite about half as long as telopodite, supplied with a subtriangular, midway, membranous lobe (l) and a large apical uncus (u) showing two caudal, parallel and strongly adjacent rows of simple or bifid spinules (s) before u branching into two peculiar apical structures, one a lateral spatuliform process (p) (in situ directed strongly laterad), the other a mesal subunciform lappet (la) with a smaller ventral hook (h) at base. Neither an accessory seminal chamber nor a hairy pulvillus.