Zephronia montis Semenyuk, Golovatch and Wesener

Semenyuk, Irina, Golovatch, Sergei I. & Wesener, Thomas, 2018, Four new species of giant pill-millipedes from Vietnam (Sphaerotheriida, Zephroniidae), Zootaxa 4459 (3), pp. 535-550: 547-549

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Zephronia montis Semenyuk, Golovatch and Wesener

sp. nov.

Zephronia montis Semenyuk, Golovatch and Wesener  , sp. nov.

Figs 1D View Figure , 9B View Figure , 10 View Figure , 11 View Figure

Material examined: Type specimens. Holotype male ( ZMUMAbout ZMUM), Vietnam, Gia Lai Province, Kon Ka Kinh National Park , near park headquarters (N 14°12' E 108°18', 1400–1500 m. a.s.l.), mixed tropical cloud forest, slopes, litter and under logs, V.2017, leg. I.I. SemenyukGoogleMaps  . Paratype: 1 female ( ZFMKAbout ZFMK MYR 6435), same data as holotypeGoogleMaps  .

Diagnosis. Small, 28.5 mm long, chestnut-brown Zephronia  with traces of green coloration on anterior tergites and with dark posterior margins. Surface shiny, glabrous, appendages dark green. Zephronia montis  sp. nov. in its general characteristics fits into the Zephronia  sensu stricto group, but differs from all known Zephronia  species except Z. konkakinhensis  sp. nov. in characters of their walking legs, in which the prefemora and femora are greatly expanded mesally, as long as wide and carrying numerous spine-like projections ( Fig. 10D View Figure ). Zephronia montis  sp. nov. differs from Z. konkakinhensis  sp. nov. mainly in anterior telopod structure; in the former its telopoditomere 4 ( Fig. 10A View Figure ) is much longer than in the latter ( Fig. 7A View Figure ).

Description. Measurements: Holotype male. Body length ca 30 mm, width of thoracic shield = 13.4 mm, of tergite 8 = 14.0 mm (= broadest), height of thoracic shield = 8 mm (= highest). Female paratype: length ca 28.6 mm, width of thoracic shield = 13.4 mm, of tergite 9 = 14.1 mm (= broadest), height of thoracic shield = 7.8 mm, of tergite 9 = 8.4 mm (= highest).

Coloration: Head dark brown. Tergites shiny, chocolate brown with slight green hue, coloration darker towards posterior of each tergite. Anal shield chocolate brown ( Fig. 1D View Figure ). Antennae and legs pale beige. Head: wide and short. Eyes with>65 ocelli. Aberrant ocellus located inside antennal groove. Antennae short, with rounded joints, protruding posteriorly to leg-pair 2 ( Fig. 10G View Figure ). Antennomere 1 with cuticular scales ( Fig. 11A View Figure ). Sizes of antennomeres 1>2>3=4=5<<6 ( Fig. 11A View Figure ). Antennomere 6 densely pubescent, with a single row of sensilla basiconica surrounding apical disc. Shape cylindrical, male apical disc with 48/38 apical sensory cones ( Fig. 11B View Figure ), that of female with 16/30 apical cones. Organ of Tömösváry located on a special crest-like brim at margin of antennal groove, orientated towards eyes. Gnathochilarium: structure typical of the order. Stipites and paramentum bearing several long setae. Mandibles (not examined. Stigmatic plates: first stigmatic plate triangular, apex broadly rounded, curved towards coxa 1. Laterotergites: first laterotergite tip weakly extended, well-rounded. Collum: glabrous, except for anterior margin carrying 4–8 isolated long setae. Thoracic shield: surface as in tergites (see below). Shallow grooves filled with numerous long setae, no keels. Tergites: surface shiny, glabrous. Tips of paratergites of midbody tergites straight, not projecting. Endotergum: inner section lacking any spines or long setae, tiny setae barely visible. Middle area with a single row of round, sparse, cuticular impressions. Apically, 2–3 rows of short marginal bristles protruding slightly beyond tergal margin ( Fig. 9B View Figure ). Bristles not smooth, with numerous small spicules ( Fig. 9B View Figure ). Anal shield: large and well-rounded, glabrous. Surface similar to that of tergites. Underside carrying a single, black, locking carina of medium length, located close to tergal margin. Legs: leg-pair 1 with 2, leg-pair 2 with 4, leg-pair 3 with 5 ventral spines. First two leg-pairs without an apical spine. Leg-pairs 4–21 with 8 ventral spines and an apical spine. In leg-pair 9, femur slightly wider than long, tarsus 3.1X longer than wide ( Fig. 10D View Figure ). All podomeres setose. Coxa with a large, well-rounded process. Prefemur with mesal margin expanded into a dentate margin featuring ca 10 teeth. Femur mesally expanded into a dentate margin featuring 12–14 teeth.

Female sexual characters: vulva large, covering 1/2 of coxa, extending mesally to 1/3 of prefemur length ( Fig. 10H View Figure ). Operculum rounded, projecting in a well-rounded mesal lobe. Subanal plate: large, high, triangular, with a well-rounded tip.

Male sexual characters: gonopore covered with a single, undivided, triangular, sclerotized plate. Anterior telopods ( Figs 10A–C View Figure ): first telopoditomere rectangular, slightly longer than wide. Telopoditomere 2 large, as long

as telopoditomeres 3 and 4 combined. Process of telopoditomere 2 located posteriorly, but partly visible laterally in anterior view. Process broad, wider than telopoditomeres 3 and 4. Process tapering apically, well-rounded, Telopoditomere 3 slender, 2.3X longer than wide, twice as long as telopoditomere 4. Telopoditomere 3 posteriorly with a row of ca 7 teeth apicolaterally, at midpoint with a single spine mesally. Telopoditomere 4 more slender and only half as long as telopoditomere 3, in posterior aspect without any teeth, but with two prominent spines. All podomeres covered with long sparse setae. Posterior telopods ( Figs 10E, F View Figure ): first telopoditomere narrow and wide, twice as wide as high. Immovable finger (process of telopoditomere 2) longer than movable finger and consisting of telopoditomeres 3 and 4. Immovable finger slender, 2.2X longer than wide, not curved, tapering apically. Margin towards movable finger genus-characteristic, with two large, triangular, membranous lobes and several rows of circular sclerotized spots. Telopoditomere 3 elongated, typical of the genus, 2.4X longer than telopoditomere 4. Margin towards immovable finger with a large membranous lobe and a single long and slender spine, posterior surface with a row of 16 crenulated and sclerotized teeth. Telopoditomere 4 slender, only half as wide as telopoditomere 3, 2.1X longer than wide, slightly tapering apically, at inner margin with two long spines and a single membranous lobe. Entire telopod on anterior side covered with long setae, except for telopoditomere 4. In posterior view, telopoditomeres 3 and 4 with setae only at lateral margins.

Distribution and Ecology. The species is found sympatrically with Sphaerobelum konkakinhense  sp. nov. The population density of Zephronia montis  sp. nov. is even less than that of the Sphaerobelum  . The same semisedentary lifestyle as in Sphaerobelum konkakinhense  sp. nov. was observed in Zephronia montis  sp. nov.

Name. Adjective, to emphasize the montane habitat restricted to the very top of a mountain.


Zoological Museum, University of Amoy


Zoologisches Forschungsmuseum Alexander Koenig