Piyatida Pimvichai

Royal Belgian Institute of Natural Sciences · Direction Taxonomy and Phylogeny

Trichoderma species are ubiquitous saprophytic fungi commonly found in soil, with potential as fungal biocontrol agents for plant disease control and growth promotion. This research aimed to assess the attributes of Trichoderma sp. as plant growth promoters, focusing on nitrogen fixation, siderophore production, plant nutrient solubilization and in...

Plant Growth Promoting Rhizobacteria (PGPR) are commonly used to produce biofertilizers. As such, the purpose of the present research was to develop a PGPR biofertilizer formulation from four Streptomyces strains isolated from millipede fecal pellets and to select suitable carriers for them. The four Streptomyces isolates were Streptomyces sp. KLS-...

The assassin snail genus Anentome is widely distributed in South East Asia. In Thailand, the genus comprises at least six species, one of which is Anentome wykoffi, a species that may act as an intermediate host of parasitic trematodes. Recent fieldwork has shown that A. wykoffi is far more common and widespread in Thailand than has been assumed, y...

A new species of the giant pill millipede genus Sphaerobelum is described: Sphaerobelum turcosa sp. nov. from the northeastern part of Thailand. Species delimitation is based on morphological characters and COI sequence data. The new species can be clearly discriminated from congeners by its greenish-blue body color, the face mask-like appearance o...

The microbial properties of millipede fecal pellets have been studied mainly in Glomerida (pill millipedes), and much less in the significant majority of other millipede groups. Therefore, the present study examined actinomycetes isolated from the fecal pellets of the non-glomerid giant millipede Thyropygus resimus Attems, 1938 (Spirostreptida) to...

Snorkel snails (genus Rhiostoma) are widely distributed in Indo-China and on the Malay Peninsula. The shell morphology is traditionally used for species identification yet in Thailand, the common snorkel snail, Rhiostoma housei, shows considerable variation in shell morphology within and between populations. Therefore species identifications and de...

This paper reports on the chemical composition and antimicrobial activity of the defensive secretions of the giant millipede, Anurostreptus sculptus (Spirostreptida: Harpagophoridae). The chemical composition of the defensive secretions was analyzed by gas chromatography-mass spectrometry, demonstrating the presence of at least 13 identifiable comp...

Two new millipede species of the genus Coxobolellus Pimvichai, Enghoff, Panha & Backeljau, 2020 from Thailand are described: Coxobolellus saratani sp. nov. from Loei Province and Coxobolellus serratoligulatus sp. nov. from Uttaradit Province. The descriptions are based on gonopod morphology and two mitochondrial gene fragments (COI and 16S rRNA). T...

A new genus of the millipede family Pseudospirobolellidae, Siliquobolellus gen. nov. , is described from limestone mountains in Thailand, based on three new species, viz. Siliquobolellus amicusdraconis gen. et sp. nov. from Uthaithani Province, Siliquobolellus constrictus gen. et sp. nov. from Prachuap Khiri Khan Province and Siliquobolellus prasan...

A new genus of the millipede family Pachybolidae from Southeast Asia is described: Macrurobolus gen. nov. , with Spirobolus macrurus Pocock, 1893 as type species. This latter species is DNA barcoded (COI) and redescribed based on male morphological characters, which hitherto were unknown. The new genus differs from other pachybolid genera by having...

Hitherto, the millipede genus Apeuthes (family Pachybolidae, subfamily Trigoniulinae) was only known from three species described in Vietnam based on morphological characters. The present study uses two partial mitochondrial gene fragments (cytochrome c oxidase I (COI) and 16S ribosomal RNA) and morphology to define four new Apeuthes species from M...

A new giant species of the subfamily Rhynchoproctinae with strikingly bi-coloured, red-yellow legs contrasting with a black body is described: Alienostreptus bicoloripes sp. nov. from Vietnam. The new species is assigned to the genus Alienostreptus Pimvichai, Enghoff & Panha, 2010 hitherto comprising one species, A. alienus (Attems, 1936), and diff...

Pseudospirobolellidae is a poorly known family of spirobolidan millipedes with only two genera and five described species. Yet, the descriptive taxonomy and molecular systematics of this group have been largely neglected. Therefore, the present work presents an integrative taxonomic study of new pseudospirobolellid taxa in Thailand. To this end, tw...

Species-level taxonomy and phylogeny of two genera of South-East (SE) Asian pachybolid millipedes are analysed with a combination of morphological characters and DNA sequences (two mitochondrial gene fragments: COI and 16S rRNA). Strong support is found for the genera Litostrophus Chamberlin, 1921 and Atopochetus Attems, 1953 and for a clade consis...

The Thyropygus opinatus subgroup (Diplopoda: Harpagophoridae) of the T. allevatus group in Thailand is revised. Based on a phylogenetic analysis of mtDNA sequence data, it is merged with the T. bifurcus subgroup to form an extended T. opinatus subgroup. Nine new species are described: Thyropygus cimi sp. nov. and T. forceps sp. nov. from Nakhonsrit...

The genus Sterropristes Attems, 1934, currently classified in the scolopendrid subfamily Otostigminae and tribe Sterropristinae, is revised. The monotypic genus Malaccolabis Verhoeff, 1937, is synonymized with Sterropristes. S. sarasinorum Attems, 1934 from Tomohon, Celebes, Indonesia (type species of Sterropristes) and S. metallicus (Verhoeff, 193...

The Thyropygus cuisinieri subgroup of the T. allevatus group is revised. A new species is described from Thailand: T. j a r - ukchusri n. sp. The following species are re-described: T. cuisinieri Carl, 1917, T. carli Attems, 1938, and T. foliaceus (Demange, 1961), new status (elevated from subspecies status under T. cuisinieri).

The Thyropygus induratus subgroup of the T. allevatus group is revised. Three new species are described from Thailand: T. dormiens n. sp., T. laterolobatus n. sp. and T. macrosiamensis n. sp. The following species are redescribed and re-elevated from subspecies status under T. allevatus (Karsch, 1881): Thyropygus induratus Attems, 1936 (= T. puncta...

The subfamily Rhynchoproctinae is revised at the generic level. Four new genera and a remarkable new species are described: Alienostreptus, gen. nov. from Vietnam, Armatostreptus, gen. nov., Heptischius, gen. nov., and Heptischius lactuca, sp. nov. from Thailand, and Prominulostreptus, gen. nov. from China. Agaricogonopus Zhang and Zhang, 1997, is...

The Thyropygus bifurcus subgroup of the T. allevatus group is revised. Four new species are described from Thailand: T. demangei n. sp., T. quadricuspis n. sp., T. richardhoffmani n. sp., from Trang province and T. casjeekeli n. sp., from Krabi province. The other species of the T. bifurcus subgroup, viz., T. bifurcus (Demange, 1986), and T. enghof...

The Thyropygus bifurcus subgroup of the T. allevatus group is revised. Four new species are described from Thailand: T. demangei n. sp., T. quadricuspis n. sp., T. richardhoffmani n. sp., from Trang province and T. casjeekeli n. sp., from Krabi province. The other species of the T. bifurcus subgroup, viz., T. bifurcus (Demange, 1986), and T. enghof...

The Thyropygus opinatus subgroup of the T. allevatus group is revised. The T. opinatus subgroup corresponds to the genus Comugonus Démange, 1961, which is formally synonymized under Thyropygus. Eight new species are described from Thailand: T bearti n. sp., T. brachy acanthus n. sp., T. loxia n. sp., from Suratthani province, T bispinus n. sp., fro...

The Thyropygus opinatus subgroup of the T. allevatus group is revised. The T. opinatus subgroup corresponds to the genus Cornugonus Demange, 1961, which is formally synonymized under Thyropygus. Eight new species are described from Thailand: T. bearti n. sp., T. brachyacanthus n. sp., T. loxia n. sp., from Suratthani province, T. bispinus n. sp., f...

FIGURE 5. Thyropygus bearti n. sp. A: female mandibles and gnathochilarium. B: male mandibles and gnathochilarium. Arrows point at poorly sclerotized areas on right mandibular and gnathochilarial stipites.

FIGURE 9. Thyropygus inflexus, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: lateral view. D: left telopodite, anterior view. E: left telopodite, posterior view.

FIGURE 10. Thyropygus bearti, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 11. Thyropygus bispinispatula, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 1. Semidiagrammatic sketches of T. allevatus group gonopod structure labelled according to the terminology employed. A: Gonopods, without telopodites; left = anterior view, right = posterior view. B: telopodite (anterior view). C: telopodite (posterior view).

FIGURE 2. Thyropygus implicatus, SEM. A: apical view, left telopodite removed. B: posterior view, left telopodite removed. C: lateral view, with right telopodite. D: left coxa, lateral view.

FIGURE 4. Thyropygus chelatus n. sp., male. A: anterior end. B: posterior end. C: first pair of legs.

FIGURE 8. Thyropygus implicatus, specimen from Thale Ban National Park, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 15. Thyropygus cristagalli, paratype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 16. Thyropygus erectus, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 17. Thyropygus loxia, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: lateral view. D: left telopodite, anterior view. E: left telopodite, posterior view.

FIGURE 18. A: Thyropygus opinatus, living male. B: Thyropygus bearti, living male. C: Thyropygus bispinispatula, living male. D: Thyropygus brachyacanthus, living male.

FIGURE 19. A: Thyropygus chelatus, living male. B: Thyropygus cristagalli, living male. C: Thyropygus erectus, living male. D: Thyropygus loxia, living female.

FIGURE 6. (A, D, E, F): Thyropygus opinatus, gonopods. A: anterior view, left telopodite removed (specimen from Malewoon). B: anterior view, anterior coxal fold (specimen from Nakwang cave). C: anterior view, anterior coxal fold (specimen from Ban Krude). D: right coxa, posterior view. E: right telopodite, anterior view. F: right telopodite, poster...

FIGURE 14. Thyropygus chelatus, paratype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 3. Thyropygus implicatus, SEM. Spatulate lobe (sl), palette (pa), blepharochaetae (bp).

FIGURE 7. Thyropygus floweri, specimen from Bang Lang National Park, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 12. Thyropygus bispinus, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 13. Thyropygus brachyacanthus, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view.

FIGURE 8. Map of peninsular Thailand, showing the known distribution of the species of the T. bifurcus subgroup.

FIGURE 4. Thyropygus demangei, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: lateral view. D: left telopodite, posterior-mesal view. E: left telopodite, anterior-lateral view.

FIGURE 5. Thyropygus quadricuspis, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: lateral view. D: left telopodite, posterior-mesal view. E: left telopodite, anterior-lateral view.

FIGURE 2. Thyropygus enghoffi, holotype, gonopods. A: anterior view, right telopodite removed. B: posterior view, right telopodite removed. C: right telopodite, posterior-mesal view. D: right telopodite, anterior-lateral view.

FIGURE 1. Thyropygus bifurcus, holotype, gonopods. A: anterior view, right telopodite removed. B: posterior view, right telopodite removed. C: lateral view. D: right telopodite, posterior-mesal view. E: right telopodite, anterior-lateral view.

FIGURE 3. Thyropygus casjeekeli, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, posterior-mesal view. D: left telopodite, anterior-lateral view.

FIGURE 6. Thyropygus richardhoffmani, holotype, gonopods. A: anterior view, right telopodite removed. B: posterior view, right telopodite removed. C: right telopodite, posterior-mesal view. D: right telopodite, anterior-lateral view.

FIGURE 7. A: Thyropygus demangei, living male. B: Thyropygus enghoffi, living male. C: Thyropygus casjeekeli, living male. D: Thyropygus quadricuspis, living male. E: Thyropygus richardhoffmani, living male.