Anaulaciulus immensus, Mikhaljova, Elena V., Golovatch, Sergei I. & Chang, Hsueh-Wen, 2011

Mikhaljova, Elena V., Golovatch, Sergei I. & Chang, Hsueh-Wen, 2011, The millipede genus Anaulaciulus Pocock, 1895 in Taiwan, with descriptions of four new species (Diplopoda, Julida, Julidae), Zootaxa 3114, pp. 1-21 : 2-5

Anaulaciulus immensus sp. nov.

Figs 1–14

Material examined. Holotype: male (NSYSUB), Taiwan, Kaohsiung County, Liouguei, Shanping Workstation, 750 m a.s.l., March 2004, leg. M. J. Hung; Paratypes: 3 males, 2 females (NSYSUB), 1 male, 1 female ( ZMUM), same locality, March 2004; 2 males, 1 female ( IBSS), 2 males ( NMNS, 6702 – 001), same locality, April 2004, all leg. M.J. Hung.

Diagnosis. Differs from congeners mainly by the structure of the gonopod opisthomere supplied with two apical outgrowths directed laterad and a subapical front projection of the fold forming a furrow for flagellum accommodation.

Description. Male. Length 37–50 mm, vertical diameter 2.9–4.0 mm, with 57(–1), 57(–2), 58(–2), 59(–1), 59(–2), 61(–1), 62(–1) segments, excluding telson. Holotype 39 mm long, with vertical diameter 3.0 mm, with 58(– 2) segments, excluding telson. Coloration dark brown with more dark transverse bands on metazonites. Antennae and legs brown, eye patches black.

Eye patches subquadrate, composed of 40–45 ocelli. Front margin of collum can cover posterolateral corner of eye patch. Labral setae 8+8. Antennae medium-sized, rather slender and clavate, in situ extending behind to segment 6. Gnathochilarium obliquely striate medially and excavate at base of stipites ( Fig. 1 ). Length ratios of antennomeres 2–7 as 2.5:2.6:2.2:2.7:1.3:1, width ratios as 1.3:1.3:1.5:1.7:1.5:1, respectively. Antennomeres 5 and 6 each with a distodorsal corolla of numerous sensory bacilli: that on antennomere 5 incomplete, counting in the male studied at least 12 sensory bacilli, while that on antennomere 6 nearly complete, counting in the male studied at least 18 sensory bacilli.

Body compressed laterally. Ozopores lying behind stricture between pro- and metazona without touching it. Metazona with striae reaching hind margin; 26–28 striae on metazonital surface between dorsal midline and ozopore, or 11–12 striae per square lying between ozopore and axial line. Caudal projection of epiproct somewhat flattened dorsoventrally, covered with sparse setae and carrying a small claw-shaped process curved dorsally ( Fig. 2 ).

Legs relatively short and slender. Ventral pads present on postfemur and tibia ( Fig. 3 ), starting from legs 2; pads decreasing in size towards telson, totally disappearing on postfemur near posterior body end. Claw curved, at base with a tiny knob ventrally ( Fig. 4 ). Claws of legs 2 of same conformation. Leg pair 1 with strong setae lateroventrally ( Fig. 5 ). Penes deeply bifid, with strongly diverging branches ( Fig. 6 ).

Gonopods. Promere subtriangular in distal part, rounded apically, posterior surface somewhat concave, flagellum relatively long, rudimentary telopodites well-visible ( Fig. 7 ). Promere about half the length of opisthomere. Opisthomere ( Figs 8, 9 , 12, 13 ) long and straight, with an anteromesal furrow along its axis for flagellum accommodation. Fold forming the furrow extended in distal part into a front subapical outgrowth (a р). Opisthomere tip ( Figs 10, 11 ) supplied with two flat, laterally curved outgrowths, one of which beak-shaped. Middle and distal parts of opisthomere partly clothed with small setoid filaments.

Female. Length 38–43 mm, vertical diameter 3.0 mm, with 57(– 3), 57(– 2), 59(–2) segments, excluding telson. Claws as in male. Vulvae as in Fig. 14 . Operculum longer than bursa, with two rows of setae on front face (12 setae in the vulva examined). Apical margin of operculum with three low prominences, middle one of which with two minute outgrowths. Bursa abundantly setose; the vulva examined with four setae on lateral sclerite, with 13 setae on each side of median plate of posterior sclerite, and with five setae on mesal sclerite, i.e., a total of 35 setae. Caudally, bursa with a smooth central concavity.

Name. The specific epithet refers to the largest body size as compared to the other julids of Taiwan.

Figures

FIGURES 1 – 6. Anaulaciulus immensus sp. nov., male paratype. 1, gnathochilarium; 2, posterior part of body; 3, distal part of a midbody leg; 4, claw of a midbody leg; 5, leg pair 1; 6, penes.

FIGURES 7 – 11. Anaulaciulus immensus sp. nov., male paratype. 7, promeres, caudal view; 8, opisthomere, front view; 9, opisthomere, mesal view; 10, apex of opisthomere, front view; 11, apex of opisthomere, mesal view; a р, front projection of fold forming a furrow for flagellum accommodation along opisthomere axis.

FIGURES 12 – 14. Anaulaciulus immensus sp. nov., male (12 – 13) and female (14) paratypes. 12, opisthomere, caudal view; 13, opisthomere, front view; 14, vulva, caudal view. Scales in mm.