Tylopus hongkhraiensis, Likhitrakarn & Golovatch & Panha, 2016

Likhitrakarn, Natdanai, Golovatch, Sergei I. & Panha, Somsak, 2016, The millipede genus Tylopus Jeekel, 1968 (Diplopoda, Polydesmida, Paradoxosomatidae), with a key and descriptions of eight new species from Indochina, European Journal of Taxonomy 195, pp. 1-47 : 7-10

publication ID	https://doi.org/ 10.5852/ejt.2016.195
DOI	https://doi.org/10.5281/zenodo.3852410
persistent identifier	https://treatment.plazi.org/id/03EB5A00-FFF9-7D61-AC35-D55AFCA79CB6
treatment provided by	Valdenar
scientific name	Tylopus hongkhraiensis
status	sp. nov.

Treatment

Tylopus hongkhraiensis View in CoL sp. nov.

urn:lsid:zoobank.org:act:E217CF1E-83D8-4EFD-875B-7C3845D01580

Figs 4–6 View Fig View Fig View Fig , 26 View Fig

Diagnosis

Differs from all known congeners in the almost missing paraterga, coupled with the gonopod being especially similar to that of T. magicus Golovatch, 1984 , but differs in process h being strong and

pointed, while process z long, slender and pointed.

Etymology

The species is named to emphasize the type locality; adjective.

Material examined

Holotype

THAILAND: Ƌ, Huai Hong Khrai Royal Development Study Centre, Doi Saket , Chiang Mai, 18°52'45" N, 99°12'40" E, ca 420 m a.s.l., 29 Jul. 2015, leg. N. Likhitrakarn ( CUMZ).

GoogleMaps

Paratypes

THAILAND: 4 ƋƋ, 4 ♀♀ ( CUMZ); 1 Ƌ, 1 ♀ ( ZMUM ρ3060); 1 Ƌ, 1 ♀ ( ZMUC); 1 Ƌ, 1 ♀ ( NHMW), all same data as for holotype.

Description

MEASUREMENTS AND COLOUR. Length 11.2–12.8 (Ƌ) or 11.5–12.6 mm (♀), width of midbody pro- and metazonae 0.85–0.96 and 1.04–1.2 mm (Ƌ) or 0.85–1.05 and 1.05–1.32 mm (♀), respectively. Coloration of live animals dark brown ( Fig. 4A View Fig ); legs light brown, venter and a few basal podomeres light brown to yellow-brown. Coloration in alcohol after three months of preservation faded to light brown; antennae and epiproct light brown to pallid, venter and a few basal podomeres light brown to pallid ( Fig. 4 View Fig B–J).

HEAD. Clypeolabral region and vertex sparsely setose, epicranial suture distinct. Antennae rather short ( Fig. 4A View Fig ), surpassing body segment 2 (Ƌ, ♀) when stretched dorsally. In width, segment 3 <2 <collum <segment 4 <5 <6 <7 <head <8–17 (Ƌ) or segment 2 <3 <collum <segment 4 <5 = 6 <7 <head <8–17 (♀); thereafter body gently and gradually tapering. Collum with three transverse rows of setae: 3+3 anterior, 2+2 intermediate and 3+3 posterior; caudal corner very narrowly rounded, not surpassing rear tergal margin ( Fig. 4B – C View Fig ).

BODY. Tegument smooth and shining, prozonae very finely shagreened, metaterga nearly smooth, faintly rugulose and leathery ( Fig. 4 View Fig B–F, H). Postcollum metaterga with two transverse rows of setae: 2+2 anterior and 2+2 posterior, traceable at least as insertion points when setae broken off. Tergal setae simple, slender, rather short, about 1/5 of metatergal length. Axial line visible, traceable only on metazonae. Postcollum paraterga virtually missing, in pore-bearing segments lateral bulges with ozopores set at about half of midbody height. Ozopores (Op) evident ( Fig. 4E View Fig ), lateral, located at about 1/3 of metatergal length in front of posterior edge of metaterga. Transverse sulcus complete on segments 6–16, incomplete on segments 7 and 18 (Ƌ, ♀), very narrow, shallow, not reaching bases of paraterga ( Fig. 4 View Fig B–F, H). Stricture between pro- and metazonae wide, deep, evidently ribbed at bottom down to base of paraterga ( Fig. 4 View Fig B–F, H). Pleurosternal carinae complete crests with a very sharp median tooth on segment 2, increasingly reduced to a rounded caudal crest bulged on segments 2 and 3 (Ƌ, ♀), retained only as an evident, sharp, caudal tooth on segments 5 and 6, thereafter increasingly reduced in size until segment 17, remaining as a small caudal tooth on segment 18 (Ƌ) ( Fig. 4C, E, H View Fig ), or increasingly reduced to caudally roughly granulated bulges on segments 5 and 6, thereafter missing (♀). Epiproct ( Fig. 4 View Fig F–H) conical, flattened dorsoventrally, with two small, but evident, rounded apical papillae; tip subtruncate; lateral pre-apical papillae very small, lying close to tip. Hypoproct roundly subtrapeziform, setigerous knobs at caudal edge small and well-separated ( Fig. 4G View Fig ).

STERNA. Sparsely setose, without modifications; a small, rounded, densely setose sternal cone between Ƌ coxae 4 ( Fig. 4I, J View Fig ). A paramedian pair of small tubercles in front of gonopod aperture. Legs rather rather short, slightly incrassate in Ƌ, midbody ones ca 1.1–1.3 (Ƌ) or 0.8–0.9 times (♀) as long as body height, prefemora without modifications, Ƌ tarsal brushes absent.

GONOPOD. Simple ( Figs 5 View Fig , 6 View Fig ); fermorite faintly curved, stout, slightly expanded distad, showing a strong mesal groove; process h prominent, slightly curved, pointed; process z long and rather slender, evident, likewise curved and pointed; solenophore (sph) expanded distally and flattened, typically coiled, clearly bifid, with a pair of small spines.

Remarks

The millipedes were found mating on bamboo logs on the soil surface during rain. The male was observed walking along the female’s back and stimulating her with rhythmic pulses of his legs. The tips of the solenophore and solenomere in Fig. 6 View Fig are broken off.

CUMZ	Cameroon University, Museum of Zoology
ZMUM	Zoological Museum, University of Amoy
ZMUC	Zoological Museum, University of Copenhagen
NHMW	Naturhistorisches Museum, Wien