Epanerchodus alienus Mikhaljova et Lim, 2018

Mikhaljova, E. V. & Lim, K. - Y., 2018, New and poorly-known millipedes (Diplopoda) from Korea, Far Eastern Entomologist 349, pp. 1-10 : 7-9

Epanerchodus alienus Mikhaljova et Lim , sp. n.

Figs 9–11

MATERIAL. Holotype – ♂ ( NIBRIV0000810171 ), Republic of Korea: Gyeongsangbuk-do: Ulleung-gun, Dodong-ri, Bongrae-Fall , 9.V 2013, leg. K.-Y. Lim.

Paratypes: 1 ♀ ( NIBRIV0000810172 ) , 1 ♂, 1 ♀ ( FSCB), the same label as in holotype .

DESCRIPTION. MALE. Length 17–19 mm, width with paraterga 2.0 mm,

without paraterga 1.0 mm. Coloration pink. Ventral part of body beige excluding pink paraterga. Antennae, head, legs beige. Body with 20 segments. Tegument

(excluding paraterga) very delicately alveolate. Head very densely setose throughout.

Vertigial setae absent. Genae ovale in dorsal view. Antennae long and slender,

slightly clavate, in situ reaching to middle of the segment 4. Antennomeres 5 and 6

distodorsally with a small group of short dense bacilliform sensilla or setae.

Antennomere 7 with a minute parabasal cone and a distodorsal group of seta-

formed sensilla. Length ratios of antennomeres 2–7 as 1.6:2.1:1.7:1.7:1.8:1, width ratios as 0.8:0.8:0.8:1.0:1.2:1, respectively.

Collum semicircular, in width equal to head; posterior corners angular. Segments

2–4 somewhat shorter and narrower than others. Body parallel-sided on somites 6–

17, further on gradually tapering toward telson. Paraterga well-developed, set high,

starting from collum, male dorsum very faintly convex. Their front edges slightly bordered and upturned, straight, usually forming a distinct shoulder. Caudolateral corners of paraterga beak-shaped, pointed on segments 5–19. Metatergal polygonal sculpture as usual, three transverse rows of bosses, second and third rows being developed stronger than first one. Tergal setae short, almost all broken off. Ozopores evident, dorsal, ozopore formula normal. Epiproct produced into a caudal process,

medium-sized, conical, rounded at tip, with rare setae. Hypoproct semi-circular;

caudal, paramedian, setiferous papillae small and well-separated.

Sterna without modifications, setose. Legs long and slender; postfemur, tibia and tarsus with sphaerotrichs on ventral side; prefemur and femur with bifurcated setae on ventral surface. Sphaerotrichs missing toward hind part of body. Posteriormost legs without sphaerotrichs. Claws normal. Leg pair 1 reduced in size as compared to subsequent pairs (about half the size of leg pairs of midbody). Leg pair 2 slightly reduced in size as compared to subsequent pairs. Legs without any outgrowths on postfemora and tibiae.

gonopod, lateral view; 11 – distal part of gonopod, caudoventral view; en – telopodite (=

endomere in terms of Golovatch, 2014, 2015); ex – outer horn (= exomere in terms of

Golovatch, 2014, 2015); P1 – postfemoral process (= process P 1 in terms of Golovatch,

2014, 2015); P2 – additional process (= process P 2 in terms of Golovatch, 2014, 2015). Scale in mm.

Following traditional terminology, gonopods ( Figs 9–11 ) with a usual, heavily setose prefemoral portion. Femur well-developed, with strong mushroom-shaped outer horn (ex) apically carrying tiny knobs. Clivus broad, with a lamelliform delicately roughened margin. Seminal groove ending up at bottom of a broad femoral cavity. Telopodite (en) basally with a low projection and a hook-shaped apex. Postfemoral process (P1) shortest, slender with obtuse broadened apex. Additional process-branch (P2) of telopodite long and slender without any projections,

its apex pointed.

Using modern terminology (Golovatch, 2014, 2015) gonopod telopodite with strong mushroom-shaped exomere (ex) apically carrying tiny knobs and three distofemoral processes: longest endomere (en) with a basal low projection and a hook-shaped apex ( Figs 9–11 ). Process P1 shortest, slender with obtuse broadened apex. Process P2 longer than P1, slender with pointed apex and without any projections.

FEMALE. Length 20–21 mm, width with paraterga 2.5 mm, without paraterga

2.0 mm. Leg prefemora less bulging laterad. Epigynal ridge transverse, low, rounded.

Other nonsexual characters as in male.

DIAGNOSIS. Differs from congeners mainly by the configuration of the gonopod postfemoral process (= process P 1 in terms of Golovatch 2014, 2015) with obtuse broadened apex coupled with the apically pointed additional process (= process P2

in terms of Golovatch 2014, 2015).

DISTRIBUTION. Republic of Korea.

ETYMOLOGY. The specific epithet refers to the distinguishing characters of the species.

REMARKS. New species seems to be especially close to Epanerchodus sanctus

Miyosi, 1951, described from Ehimē Prefecture, Japan (Miyosi, 1951) judged from the presence of gonopod postfemoral (= process P 1 in terms of Golovatch, 2014,

2015) and additional (= process P 2 in terms of Golovatch, 2014, 2015) processes,

configuration of the gonopod telopodite (= endomere in terms of Golovatch, 2014,

2015) and outer horn (= exomere in terms of Golovatch, 2014, 2015). But Epanerchodus alienus sp. n. differs from E. sanctus by the shape of the gonopod postfemoral process (= process P 1 in terms of Golovatch, 2014, 2015) with obtuse broadened apex, the apically pointed additional process (= process P 2 in terms of

Golovatch, 2014, 2015) without any projections and the presence of the sphaerotrichs on ventral side of male leg postfemur, tibia and tarsus.

Figures

Figs 9–11. Epanerchodus alienus sp. n., male paratype. 9 – gonopod, mesal view; 10 –