Anaulaciulus oligosegmentatus, 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 : 6-9

Anaulaciulus oligosegmentatus sp. nov.

Figs 15–26

Material examined. Holotype: male ( NMNS, 6702 – 0 0 2, D – 0632), Taiwan, Nantou County, Huisun timberland, 23 January 1998, leg. S.H. Wu; Paratypes: 1 male ( NMNS, 6702 – 0 0 3, D – 0300), Taiwan, Hualien County, Zhuoxi Township, Juisui forest road, 15 February 1997, leg. S.H. Wu; 1 male ( HNHM) Taiwan, Hualien County, Taroko National Park, Mt Hohuan-Shan, Shihmon Trail, high mountain bamboo shrub ( Yushania niitakayamensis ), 24°08.785’ N, 121°17.056’E, ca 3140 m, 23 May 2008, leg. L. Dányi, Z. Korsós & E. Lazányi; 2 males, 6 females, 1 juvenile ( NMNS, 6702–004, D – 0011), 1 male (devoid of gonopods, presumably lost), 3 females ( NMNS, 6702 – 0 0 5, D – 0008), 1 male, 1 female ( IBSS), 1 female ( HNHM), Taiwan, Nantou County, Huisun timberland, 24 October 1997, leg. S.H. Wu; 1 male, 1 female ( IBSS), 1 male, 1 female (NSYSUB), 2 males, 11 females ( NMNS, 6702 – 0 0 6, D – 0298), same locality, 26 December 1997, leg. S.H. Wu; 1 male ( NMNS, 6702 – 0 0 7, D – 0373), same locality, 27 December 1997, leg. S.H. Wu; 1 male ( NMNS, 6702 – 0 0 7, D – 0376), same locality, 20 January 1998, leg. S.H. Wu; 1 male, 1 female ( ZMUM, D – 0620), same locality, 20 January 1998, leg. S.H. Wu; 1 male, 5 females, 2 juveniles (NSYSUB), Taiwan, Chiayi County, Alishan Township, Nansi Forest Road, 2000 m, 29 October 2010, leg. H.W. Chang.

Diagnosis. Differs from congeners mainly by the shape of the opisthomere carrying an anterolateral lamella broadening distally at the lateral margin into a round lobe, as well as by the subtriangular promere, with the apex somewhat varying from simply rounded to rounded with an extended mesal margin. This new species differs from the obviously especially similar A. multiarticulatus sp. nov. by the stouter body showing less numerous body segments.

Description. Male. Length 17–24 mm, vertical diameter 1.0– 1.3 mm, with 47(– 2), 48(– 4), 48(–3), 49(–3), 51(– 3), 52(– 3), 52(–2), 53(– 3), 54(–2) segments, excluding telson. Male with 49(– 3) segments, one of the last legs undeveloped/absent. Coloration brown, light brown or grey-brown with three narrow longitudinal dark brown stripes (one mid-dorsal and two lateral bands at ozopore level), so that dorsum showing two broad, ribbon-shaped, longitudinal stripes varying in the degree of expression depending on locality. Collum with two large, transverselyoval, yellowish spots. Legless segments in front of telson can also show two transversely-oval, yellowish spots on dorsal side. Clypeolabral region of head lighter. Individuals collected in 2010 showing broader brown stripes, one mid-dorsal and two lateral, these latter stripes can be marbled, similarly marbled can be dorsum as well. A male paratype from Hualien County (D–0300) pallid. Antennae and legs brown or beige, eye patches black.

Eye patches subtriangular, composed of at least 43 ocelli. Labral setae as in A. immensus sp. nov. Gnathochilarium with four setae on apical parts of stipites, with 4 – 5 setae on each lamella lingualis. Length ratios of antennomeres 2–7 as 2.1:3.1:2.9:2.9:1.6:1, width ratios as 1.1:1.4:1.7:2.0:1.7:1, respectively. Antennomeres 5 and 6 each with an incomplete distodorsal corolla of a few sensory bacilli.

Ozopores lying behind stricture, in touch with stricture only in anterior body part, set off from stricture in posterior body part. Metazona with striae reaching hind margin; 15 – 16 striae on metazonital surface between dorsal midline and ozopore, or 7 – 8 striae per square lying between ozopore and axial line. Striations on dorsum directed at a slight angle to axial line on both sides. Caudal projection of epiproct somewhat flattened dorsoventrally, subtriangular in dorsal view, covered with sparse, relatively long setae and carrying a tiny claw-shaped process, the latter either curved dorsally or directed caudad, or missing altogether.

Legs slender and relatively short, with broad, very delicately serrate pads on tibia, postfemur and femur, these pads gradually growing reduced towards posterior body end to totally disappear on last legs. Claw at base with a long and strong filament ventrally. Legs 1 with strong setae ventrolaterally and a ventral papillate knob on telopoditomere 2, apex covered with low papillae ( Fig. 15 ). Penes long, deeply bifid ( Fig. 16 ).

Gonopods. Promere subtriangular, with a slightly curved, rectangularly retrorse, mesal margin and a long flagellum; rudimentary telopodites well-visible ( Fig. 17 ). Promere about half the length of opisthomere. Apex of promere somewhat varying from simply rounded to rounded with an extended mesal margin ( Figs 21 – 23 ). Opisthomere ( Figs 18 – 20 ) long, straight, with a front furrow and a thin, membranous, intermediate lamella (il) along its axis for flagellum accommodation. Lamella il is termed "intermediate", following both Enghoff (1986) and Korsós (2001), even though its base is located on the front side of the opisthomere, while by itself it is curved mesad; the free margin of il overlaps with that of the il of the second opisthomere. Apex of il with acutangular projections. Both il and opisthomere subequal in length. In addition, opisthomere’s anterolateral face supporting a proximally very narrow anterolateral lamella (al) ["anterior", in terms of Enghoff (1986), or "lateral", in terms of Korsós (2001)], with its distal part turning onto lateral side of opisthomere to form a broad lobe (velum?) with a rounded lateral corner. Opisthomere longer than al. Apex of opisthomere with a small, thin, mesal lobe (ml) of variable breadth. Base of opisthomere with a front flap (fp) to guide promere’s flagellum.

Female. Length 14–25 mm, vertical diameter 1.0 – 1.8 mm, with 43(– 5), 43(– 4), 46(– 4), 47(– 2), 47(– 4), 47(– 3), 48(– 4), 48(– 2), 49(– 4), 51(– 2), 52(– 2), 53(– 2), 54(– 2), 58(– 2) segments, excluding telson. There are shorter females showing fewer body segments compared to males, e.g. those from D – 0 0 11 and D – 0 298 samples. However, these females, like all females with four apodous segments in front of the telson, have fully-developed vulvae, thus being adults. Vulva as in Fig. 24 . Operculum somewhat longer than bursa, with two rows of setae on anterior face (6 – 8 setae, i.e. 3 – 4 in each row, in the vulvae examined). Apical margin of operculum with three low prominences, of which middle one either well-developed ( Figs 24, 25 ) or not ( Fig. 26 ). Lateral and mesal outgrowths at operculum’s apex varying from rounded ( Figs 25, 26 ) to acute ( Fig. 24 ). Furthermore, variation in the shape of both lateral and mesal outgrowths, as well as the presence or absence of a middle prominence can be observed within a single individual ( Figs 25, 26 ), possibly as a result of abrasion with age. Bursa setose, with 3–4 setae both on lateral and mesal sclerites, 5–7 setae on each side of median plate of posterior sclerite. Caudally, bursa with a smooth central concavity.

Juvenile. Shorter, with fewer body segments, including 5 – 6 legless ones in front of telson. Name. The specific epithet refers to the fewer body segments as compared to A. multiarticulatus sp. nov.

Figures

FIGURES 15 – 20. Anaulaciulus oligosegmentatus sp. nov., male paratype. 15, leg 1, front view; 16, leg 2 and penes; 17, promere, caudal view; 18, left opisthomere, lateral view; 19, left opisthomere, front view; 20, left opisthomere, caudal view; il, intermediate lamella of opisthomere; al, anterolateral lamella of opisthomere; ml, mesal lobe of opisthomere apex; fp, basal flap of opisthomere. Scales in mm.

FIGURES 21 – 23. Anaulaciulus oligosegmentatus sp. nov., male paratypes. Variation in shape of promere apex: 21, individual from sample D – 0620, 22, individual from sample D – 0298, 23, individual from sample D – 0011. Scale in mm.

FIGURES 24 – 26. Anaulaciulus oligosegmentatus sp. nov., female paratypes. 24, vulva, caudal view; 25, distal part of left vulva from sample D – 0298, caudal view; 26, distal part of right vulva from sample D – 0298, caudal view. Scale in mm.