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Tuesday, May 9th, 2023
| Time | Event | ||||
| 2:11p | [Mollusca • 2023] Chamberlainia somsakpanhai • Discovery of A New Endangered Freshwater Mussel Species in the Genus Chamberlainia Simpson, 1900 (Bivalvia: Unionidae) from Mekong Basin
Abstract Chamberlainia somsakpanhai sp. nov., the largest freshwater bivalve (Unionidae) in the Mekong Basin, is described using morphological characters and molecular analysis. The new species differs from its congeners by having an ovate shell outline and obtuse and distinct sub-biangulate posterior margin. A multi-locus phylogenetic tree (mitochondrial COI and 16S, and nuclear 28S genes) recognized the new species along with other two members of genus, namely C. hainesiana and C. duclerci. Average genetic divergence between the new species and its congeners is 13.8–14.1% by an uncorrected COI p-distance. Keywords: conservation, endangered, pearl mussel, endemic, Thailand, Indochina
Chamberlainia somsakpanhai sp. nov. Bangon Kongim, Chirasak Sutcharit and Ekgachai Jeratthitikul. 2023. Discovery of A New Endangered Freshwater Mussel Species in the Genus Chamberlainia Simpson, 1900 (Bivalvia: Unionidae) from Mekong Basin. Tropical Natural History. Supplement 7;242-250. | ||||
| 2:11p | [Diplopoda • 2023] Thyropygus panhai & T. somsaki • Morphological and DNA Sequence Data of Two New Millipede Species of the Thyropygus induratus Subgroup (Spirostreptida: Harpagophoridae)
Abstract The common cylindrical millipede genus Thyropygus (family Harpagophoridae) comprises four informal species groups, one of which is the T. allevatus group. This group is characterized by two synapomorphic gonopodal characters: (1) gonopods with tibial and femoral spines and (2) the tibial spine is very long and recurved proximad towards the femoral spine. The T. allevatus group is further divided into four subgroups: (1) T. allevatus subgroup, (2) T. opinatus subgroup, (3) T. induratus subgroup, and (4) T. cuisinieri subgroup. Based on gonopodal characters and COI barcoding, two new species of the T. induratus subgroup are described from Loei Province, Thailand, viz. T. panhai sp. nov. and T. somsaki sp. nov. The small uncate subterminal lobe (a hook-like process) at the basal part of the palette of the telopodite is the synapomorphy that assigns these two new species to the T. induratus subgroup. The two species are morphologically also well-differentiated from each other. In contrast, the COI data neither provide strong support for their placement in the T. induratus subgroup, nor provide strong support for their species level differentiation, since their interspecific COI divergence of 7% is at the borderline between the intraspecific divergences in T. induratus, T. uncinatus and T. resimus (5–6%, but with values of up to 12%) and the mean interspecific divergence within the T. induratus subgroup (12%; range: 7–15%). Hence, the taxonomic interpretation of T. panhai sp. nov. and T. somsaki sp. nov. as separate species within the T. induratus subgroup is, for the time being, almost entirely based on morphology. Keywords: COI, gonopod, Thailand
Piyatida Pimvichai, Henrik Enghoff and Thierry Backeljau. 2023. Morphological and DNA Sequence Data of Two New Millipede Species of the Thyropygus induratus Subgroup (Diplopoda: Spirostreptida: Harpagophoridae). Tropical Natural History. Supplement 7;107-122. | ||||
| 2:11p | [Diplopoda • 2023] Tylopus bokorensis & T. panhai • Uncovering Endemism in High Montane Forests: Two New Species of Millipede Genus Tylopus Jeekel, 1968 (Polydesmida: Paradoxosomatidae) from Cambodia and Laos
Abstract Two new species of the predominantly Indochinese to southern Chinese millipedes belonging to the genus Tylopus Jeekel, 1968 are described: Tylopus bokorensis sp. nov. from southern Cambodia, and T. panhai sp. nov. from southern Laos. These species can be clearly discriminated from congeners by the shape of processes on postfemoral part of the gonopod in combination with some distinct somatic characters. Tylopus bokorensis sp. nov. is the first in this genus to be found in Cambodia. Both species inhabit montane habitats more than 1,000 m above mean sea level, and we regard them as endemic to these countries. An identification key and distribution map of Tylopus occurring in Cambodia and Laos are provided. Keywords: biodiversity, endemic species, Southeast Asia, Sulciferini
 Tylopus bokorensis Srisonchai and Likhitrakarn, sp. nov. Tylopus panhai Srisonchai and Likhitrakarn, sp. nov. Ruttapon Srisonchai, Khamla Inkhavilay, Peng Bun Ngor, Chirasak Sutcharit and Natdanai Likhitrakarn. 2023. Uncovering Endemism in High Montane Forests: Two New Species of Millipede Genus Tylopus Jeekel, 1968 (Diplopoda: Polydesmida: Paradoxosomatidae) from Cambodia and Laos. Tropical Natural History. Supplement 7;151-164 |
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