Monday 5 January 2015

Three new species of Polydesmid Millipedes from Thailand.

Polydesmid Millipedes of the family Paradoxosomatidae are found from South and Southeast Asia to Australia, dominating Millipede faunas in many areas. With over 1000 species in 200 genera the Paradoxosomatidae is probably the most specious group of Polydesmid Millipedes. The genus Tylopus is found in southern China, Myanmar, Laos, Thailand and Vietnam. With 52 described species, 29 of which have been recorded in Thailand, it is one of the largest genera in the Paradoxosomatidae.

In a paper published on the journal ZooKeys on 18 August 2014, Natdanai Likhitrakarn of the Division of Plant Protection at Maejo University, Sergei Golovatch of the Institute for Problems of Ecology and Evolution at the Russian Academy of Sciences and Somsak Panha of the Animal Systematics Research Unit at Chulalongkorn University, describe three new species of Tylopus from Thailand.

The first new species is named Tylopus corrugatus, in reference to a series of ridges on the dorsal part of its body segments. The species is described from 7 male, five female and two juvenile specimens collected in the Doi Inthanon National Park in Chiang Mai Province. The females are on average slightly longer than the males, at 16.5–21.0 mm, compared to 15.5–18.2 mm. They are brown in colour with darker backs and lighter undersides.

Tylopus corrugatus, male specimen in dorsal view. Likhitrakarn et al. (2014).

The second new species is named Tylopus parahilaroides, in reference to its similarity to the previously described species Tylopus hilaroides (‘parahilaroides’ means ‘beside hilaroides’). The species is described from two specimens, one male and one female, the male being 34 mm in length and the female 33 mm. They are reddish brown in colour, with yellowish limbs.

Tylopus parahilaroides, male specimen in dorsal view. Likhitrakarn et al. (2014).

The third new species is named Tylopus trigonum, in reference to the triangular markings on the dorsal surface of its body segments. The species is described from two male and three female specimens, collected from beside two waterfalls in Umphang District in Tak Province. The males are on average larger than the females, at 21.2–27.8 mm, compared to 22.1–24.0 mm. They are light brown in colour, with a dark brown dorsal surface, which has a series of lighter triangles.

Tylopus trigonum, male specimen in dorsal view. Likhitrakarn et al. (2014).

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