Orthomorpha coarctata (de Saussure, 1860)

Likhitrakarn, Natdanai, Golovatch, Sergei I., Semenyuk, Irina, Efeykin, Boris D. & Panha, Somsak, 2019, Review of the millipede genus Orthomorpha Bollman, 1893 (Diplopoda, Polydesmida, Paradoxosomatidae) in Vietnam, with several new records and descriptions of two new species, ZooKeys 898, pp. 121-158 : 121

Orthomorpha coarctata (de Saussure, 1860)

Polydesmus coarctatus de Saussure, 1860: 297 (D).

Paradesmus flavocarinatus Daday, 1889: 136 (D). Synonymized by Enghoff (2005).

Orthomorpha coarctata - Pocock 1895: 809 (R, M, K); Attems 1937: 62 (D); Jeekel 1968: 45 (M); Likhitrakarn et al. 2011: 12 (D, R, K), Golovatch and Wesener 2016: 47 (L); et auctorum.

Orthomorpha coarctata gigas Attems, 1927: 63 (D). Synonymized by Jeekel (1968).

Asiomorpha coarctata - Verhoeff 1939: 117 (D); Nguyen and Sierwald 2013: 1236 (L); et auctorum.

Orthomorpha coarctata gigas - Jeekel 1968: 45 (M); Golovatch 1998: 43 (K); et auctorum.

New material examined.

3 ♂, 1 ♀, 2 juv. (ZMUM), Vietnam, Dong Nai Province, Cat Tien National Park, 11°25'16"N, 107°25'39"E, 120 m a.s.l., on floor between huts in the Park’s headquarters, an open site in monsoon tropical forest, night time, 5 & 8.VIII.2015; 3 ♂, 2 ♀ (ZMUM), Vietnam, Dong Nai Province, Thac Mai waterfall and hot spring area, 11°06'12"N, 107°24'24"E, grassy recreation area near pond, in leaf litter, daytime, 01.06.2018, all I. Semenyuk leg.

Remarks.

This pantropical anthropochore species has been redescribed several times and recently revised ( Likhitrakarn et al. 2011). It is often assigned to the monotypic genus Asiomorpha Verhoeff, 1939 (e.g., Nguyen and Sierwald 2013), but we follow Jeekel (1968) who treated it in Orthomorpha . Molecular evidence, however, shows a very strong genetic isolation of coarctata from the other formal congeners, thus favouring the recognition of Asiomorpha as a separate monobasic genus ( Fig 20 ). This species has already been recorded from Vietnam, on sea shore north of Nhatrang ( Golovatch 2017).

The new samples belong to the typical form of O. coarctata , whereas the only other form, O. c. gigas Attems, 1927, from Ambon, Indonesia, has long been synonymized under O. c. coarctata (see Jeekel 1968; Likhitrakarn et al. 2011).

Figures

Figure 20. A rooted phylogram based on COI sequences obtained from the relevant literature on Paradoxosomatidae (Nguyen et al. 2017, 2018) and available in GenBank (all given in black, yet with several name updates according to modern taxonomy), combined with new haplotypes (six species and two varieties, these latter put in quotation marks and all highlighted in red). Tree topology was reconstructed using MrBayes software. The values of statistical support are given above the branches only when these exceed 65 %.