In this study, we describe a new dancing semislug from a limestone hill area in northeastern Thai... more In this study, we describe a new dancing semislug from a limestone hill area in northeastern Thailand. Cryptosemelus nigersp. nov. differs from the three recognized congener species from western and southern Thailand, due to differences in their body and shell lobes coloration, appearance of penial caecum, shape and surface texture of penis and epiphallus, and radula formula and morphology.
In this correspondence, we present a summary of taxonomic names of freshwater Mollusca introduced... more In this correspondence, we present a summary of taxonomic names of freshwater Mollusca introduced by Dr. Nguyen N. Thach, an enthusiastic and productive malacologist from Vietnam. We show that this researcher described one new genus and 12 new nominal species of freshwater molluscs from Southeast Asia. Two of these nominal species, Sinanodonta hunganhi Thach, 2016 and Lanceolaria bogani Thach, 2016 (Bivalvia: Unionidae), were already considered junior synonyms of S. jourdyi (Morlet, 1886) and L. fruhstorferi (Dautzenberg, 1900), respectively (Do et al. 2018; Đặng and Hố 2019). Here, we propose one more synonym for the invasive Golden Apple Snail as follows: Pomacea canaliculata (Lamarck, 1822) [=Pomacea thachi Huber in Thach, 2020 syn. nov.] (Gastropoda: Ampullariidae). Furthermore, we establish the formal synonymy for the following taxa: Taia Annandale, 1918 [=Boganmargarya Thach, 2018 syn. nov.]; Taia shanensis (Kobelt, 1909) [=Boganmargarya huberi Thach, 2018 syn. nov.] (Gastropo...
The snorkel snail genus Rhiostoma Benson, 1860 is comprised of terrestrial cyclophorid snails wit... more The snorkel snail genus Rhiostoma Benson, 1860 is comprised of terrestrial cyclophorid snails with wide-ranging species diversity and radiation in Southeast Asia. The typical characters of the genus are a depressed shell, a detached and descending portion of the last whorl with a distinctive peristomal breathing device attached, and a calcareous cup-shaped operculum. Herein, we have revised the systematics of extant species based on shell morphology combined with COI barcoding. From these thirty recognised species, twelve are described as new to science: R. ? amarapuraensesp. nov., R. anceyisp. nov., R. breviocollarsp. nov., R. ebenozosterasp. nov., R. cheliopegmasp. nov., R. furfurosumsp. nov., R. gnomus, sp. nov., R. lannaensesp. nov., R. laoensesp. nov., R. platymorphasp. nov., R. rhothonotaphrosasp. nov., and R. tigrinasp. nov. All conchological characters are provided via illustrations of type specimens and living snails, and descriptions of the shells and radulae. Phylogenetic...
Fig. 2.Aenigmatoconcha clivicola, new species, in natural habitat. A, living snail; B, foraging b... more Fig. 2.Aenigmatoconcha clivicola, new species, in natural habitat. A, living snail; B, foraging behavior. Photographs: Kitti Tanmuangpak.
Fig. 3. Species distribution models of five Amphidromus subspecies. Darker colors represent highe... more Fig. 3. Species distribution models of five Amphidromus subspecies. Darker colors represent higher probabilities of suitable habitat. Upper and lower rows are probabilities of suitable habitat in years 2000 and 2050, respectively. A and F are models of A. (A.) atricallosus atricallosus. B and G are models of A. (A.) atricallosus leucoxanthus. C and H are models of A. (A.) givenchyi. D and I are models of A. (A.) inversus annamiticus. E and J are models of A. (A.) schomburgki dextrochlorus.
<i>Landouria chloritoides</i> sp. nov. urn:lsid:zoobank.org:act: 740CA614-D17B-47A3-A... more <i>Landouria chloritoides</i> sp. nov. urn:lsid:zoobank.org:act: 740CA614-D17B-47A3-A719-7DFC7D2CE2D5 Figs 3D, 4D, 5D, 6J–L; Tables 1–4 <i>Landouria</i> sp.1 – Ounchareon 2015: 29–32, 44–50, 54–56, 59, 61, figs 4.2c, 4.3c, 4.4. 4.5i–l, 5.5, 5.7. <i>Landouria</i> sp.2 – Buddharaksa 2016: 37–38, 41–42, figs 4.19, 4.20, 5.1, 5.2. <i>Landouria</i> sp.4 – Yingkhamhang 2016: 25–26, 39–41, 43–45, 49–52, figs 4.7, 4.8, 4.21d, 4.22d, 5.3a, 5.4a. Diagnosis Shell shape similar to that of the genus <i>Chloritis</i> Beck, 1837 (Camaenidae), but with last whorl stout and usually slightly angular, peripheral keel blunt, suture deep, aperture oval and oblique. Flagellum small ovate, penis very large and stout compared to vagina; vagina and free oviduct short (Fig. 5D). Radula with lanceolate teeth. Etymology The specific epithet ' <i>chloritoides</i> ' refers to the conchological similarity between the shell of the new species and that of the camaenid genus <i>Chloritis</i>. Type material <b>Holotype</b> THAILAND • shell (SH = 12.0 mm, SW = 19.0 mm, AH = 7.7 mm, AW = 7.3 mm, UW = 3.9 mm); Khon Kaen Province, Chum Phae District, Wat Thep Udom Wanaram; 16°45′29″ N, 101°57′55.03″ E; alt. 406 m; 9 Jun. 2017; B. Nahok, S. Tumpeesuwan and C. Tumpeesuwan leg.; NHMSU-00029. (Fig. 3D) <b>Paratypes</b> THAILAND • 8 shells, 14 living specs; same collection data as for holotype; GenBank No. MN449404 and MZ435749; NHMSU-00030. Other material examined THAILAND • 4 shells, 8 living specs; North East, Khon Kaen Province, Chum Phae District, Pu Lup Cave; 16°49′49.78″ N, 101°59′9.97″ E; alt. 336 m; NHMSU-00031. Description SHELL (Fig. 3D, Table 1). Dextral, somewhat depressed, relatively large-sized. Whorls 6½, suture deep, apex obtuse, and moderately depressed, with low conical spire. Body whorl rounded, slightly keeled, red-brown in living specimens (Fig. 4D), empty shells are paler (Fig. 3D). Umbilicus very deep and wide. Aperture almost circular, with slightly thickened and weakly expanded lip. GENITAL SYSTEM (n = 3) (Fig. 5D, Table 4). Penis [...]
Fig. 2. Bayesian majority-rule consensus tree summarizing the phylogenetic relationships of speci... more Fig. 2. Bayesian majority-rule consensus tree summarizing the phylogenetic relationships of species of Landouria Godwin-Austen, 1918 based on concatenated COI and 16S sequences. Numbers at nodes indicate branch support based on posterior probability (BI) / bootstrapping (ML) / bootstrapping (NJ). # indicates branches that received <50% ML, NJ bootstrap support. Scale bar = 0.5 substitutions/site.
Currently, the parasitic and endosymbiontic fauna of Corbicula clams remain poorly studied throug... more Currently, the parasitic and endosymbiontic fauna of Corbicula clams remain poorly studied throughout their range. Here, using samples from the Mekong basin, we describe two Symbiocloeon species new to science: Symbiocloeon corbiculinus sp. nov. and Symbiocloeon laoensis sp. nov. Our results and a review of available published data indicate that freshwater bivalve-associated mayflies are narrow host specialists, being associated with one or a few closely related species of freshwater bivalves. The bivalve-associated mayfly larvae have several specific morphological traits compared with free-living species, which include a reduction of integument chitinization and a significant reduction of the surface structures on segments. An increase in area of the respiratory surface of larval tergalia was also recorded. The possible positive and negative effects of mayflies on the clam hosts are discussed. This study is an example of the many possible hidden associations between aquatic species...
Fig. 2. Pearsonia lamphunensis, new species. A, Type locality habitat in dolomitic limestone hill... more Fig. 2. Pearsonia lamphunensis, new species. A, Type locality habitat in dolomitic limestone hill, Lamphun Province; B, Aestivating living snail in natural habitat. Paratype (NHMSU-0007); C, Female partially retracted with the operculum (op) showing; D, vaginal groove (vg) near right tentacle visible.
Fig. 5. Aenigmatoconcha sumonthai, new species, genital system of paratype (NHMSU-0016). Abbrevia... more Fig. 5. Aenigmatoconcha sumonthai, new species, genital system of paratype (NHMSU-0016). Abbreviations: ag = albumen gland, hd = hermaphroditic duct, ut = uterus, pro = prostate gland, vd = vas deferens, ep = epiphallus, erc = epiphallic retractor caecum, p = penis, gs = gametolytic sac, v = vagina, fo = free oviduct, at = atrium.
Tram Chim is a remnant wetland of the plain of reeds that drained prior to reunification. Tram Ch... more Tram Chim is a remnant wetland of the plain of reeds that drained prior to reunification. Tram Chim was most well known for being home to the Eastern Sarus Crane (Grus antigone sharpii) and many other water birds. One of the most essential things here is how to control the water levels effectively. Keeping the water too long and the water levels too high can destroy the ecosystem in Tram Chim while drying up the water and making the area too dried cause fire problems. The first objective was to analyze the hydrology of Tram Chim through a water budget and by assessing the variability and connectivity. The second objective was to survey the types of soils present and understand the processes involved. We found the water velocity at Tram Chim was close to zero. The pH values at Tram Chim indicate that water levels at unit A4 have kept too dry for too long, causing acid soils to oxidize, creating acid water when the wet season occurs. Due to this problem, many managers at Tram Chim att...
This dataset contains the digitized treatments in Plazi based on the original journal article Tan... more This dataset contains the digitized treatments in Plazi based on the original journal article Tanmuangpak, Kitti, Dumrongrojwattana, Pongrat, Tumpeesuwan, Chanidaporn, Tumpeesuwan, Sakboworn (2015): Sinoennea loeiensis, a new species of diapherid microsnail (Pulmonata: Streptaxoidea: Diapheridae) from Phu Pha Lom Limestone Hill, Loei Province, Northeastern Thailand. Raffles Bulletin of Zoology 63: 293-300, DOI: http://doi.org/10.5281/zenodo.4502341
In this study, we describe a new dancing semislug from a limestone hill area in northeastern Thai... more In this study, we describe a new dancing semislug from a limestone hill area in northeastern Thailand. Cryptosemelus nigersp. nov. differs from the three recognized congener species from western and southern Thailand, due to differences in their body and shell lobes coloration, appearance of penial caecum, shape and surface texture of penis and epiphallus, and radula formula and morphology.
In this correspondence, we present a summary of taxonomic names of freshwater Mollusca introduced... more In this correspondence, we present a summary of taxonomic names of freshwater Mollusca introduced by Dr. Nguyen N. Thach, an enthusiastic and productive malacologist from Vietnam. We show that this researcher described one new genus and 12 new nominal species of freshwater molluscs from Southeast Asia. Two of these nominal species, Sinanodonta hunganhi Thach, 2016 and Lanceolaria bogani Thach, 2016 (Bivalvia: Unionidae), were already considered junior synonyms of S. jourdyi (Morlet, 1886) and L. fruhstorferi (Dautzenberg, 1900), respectively (Do et al. 2018; Đặng and Hố 2019). Here, we propose one more synonym for the invasive Golden Apple Snail as follows: Pomacea canaliculata (Lamarck, 1822) [=Pomacea thachi Huber in Thach, 2020 syn. nov.] (Gastropoda: Ampullariidae). Furthermore, we establish the formal synonymy for the following taxa: Taia Annandale, 1918 [=Boganmargarya Thach, 2018 syn. nov.]; Taia shanensis (Kobelt, 1909) [=Boganmargarya huberi Thach, 2018 syn. nov.] (Gastropo...
The snorkel snail genus Rhiostoma Benson, 1860 is comprised of terrestrial cyclophorid snails wit... more The snorkel snail genus Rhiostoma Benson, 1860 is comprised of terrestrial cyclophorid snails with wide-ranging species diversity and radiation in Southeast Asia. The typical characters of the genus are a depressed shell, a detached and descending portion of the last whorl with a distinctive peristomal breathing device attached, and a calcareous cup-shaped operculum. Herein, we have revised the systematics of extant species based on shell morphology combined with COI barcoding. From these thirty recognised species, twelve are described as new to science: R. ? amarapuraensesp. nov., R. anceyisp. nov., R. breviocollarsp. nov., R. ebenozosterasp. nov., R. cheliopegmasp. nov., R. furfurosumsp. nov., R. gnomus, sp. nov., R. lannaensesp. nov., R. laoensesp. nov., R. platymorphasp. nov., R. rhothonotaphrosasp. nov., and R. tigrinasp. nov. All conchological characters are provided via illustrations of type specimens and living snails, and descriptions of the shells and radulae. Phylogenetic...
Fig. 2.Aenigmatoconcha clivicola, new species, in natural habitat. A, living snail; B, foraging b... more Fig. 2.Aenigmatoconcha clivicola, new species, in natural habitat. A, living snail; B, foraging behavior. Photographs: Kitti Tanmuangpak.
Fig. 3. Species distribution models of five Amphidromus subspecies. Darker colors represent highe... more Fig. 3. Species distribution models of five Amphidromus subspecies. Darker colors represent higher probabilities of suitable habitat. Upper and lower rows are probabilities of suitable habitat in years 2000 and 2050, respectively. A and F are models of A. (A.) atricallosus atricallosus. B and G are models of A. (A.) atricallosus leucoxanthus. C and H are models of A. (A.) givenchyi. D and I are models of A. (A.) inversus annamiticus. E and J are models of A. (A.) schomburgki dextrochlorus.
<i>Landouria chloritoides</i> sp. nov. urn:lsid:zoobank.org:act: 740CA614-D17B-47A3-A... more <i>Landouria chloritoides</i> sp. nov. urn:lsid:zoobank.org:act: 740CA614-D17B-47A3-A719-7DFC7D2CE2D5 Figs 3D, 4D, 5D, 6J–L; Tables 1–4 <i>Landouria</i> sp.1 – Ounchareon 2015: 29–32, 44–50, 54–56, 59, 61, figs 4.2c, 4.3c, 4.4. 4.5i–l, 5.5, 5.7. <i>Landouria</i> sp.2 – Buddharaksa 2016: 37–38, 41–42, figs 4.19, 4.20, 5.1, 5.2. <i>Landouria</i> sp.4 – Yingkhamhang 2016: 25–26, 39–41, 43–45, 49–52, figs 4.7, 4.8, 4.21d, 4.22d, 5.3a, 5.4a. Diagnosis Shell shape similar to that of the genus <i>Chloritis</i> Beck, 1837 (Camaenidae), but with last whorl stout and usually slightly angular, peripheral keel blunt, suture deep, aperture oval and oblique. Flagellum small ovate, penis very large and stout compared to vagina; vagina and free oviduct short (Fig. 5D). Radula with lanceolate teeth. Etymology The specific epithet ' <i>chloritoides</i> ' refers to the conchological similarity between the shell of the new species and that of the camaenid genus <i>Chloritis</i>. Type material <b>Holotype</b> THAILAND • shell (SH = 12.0 mm, SW = 19.0 mm, AH = 7.7 mm, AW = 7.3 mm, UW = 3.9 mm); Khon Kaen Province, Chum Phae District, Wat Thep Udom Wanaram; 16°45′29″ N, 101°57′55.03″ E; alt. 406 m; 9 Jun. 2017; B. Nahok, S. Tumpeesuwan and C. Tumpeesuwan leg.; NHMSU-00029. (Fig. 3D) <b>Paratypes</b> THAILAND • 8 shells, 14 living specs; same collection data as for holotype; GenBank No. MN449404 and MZ435749; NHMSU-00030. Other material examined THAILAND • 4 shells, 8 living specs; North East, Khon Kaen Province, Chum Phae District, Pu Lup Cave; 16°49′49.78″ N, 101°59′9.97″ E; alt. 336 m; NHMSU-00031. Description SHELL (Fig. 3D, Table 1). Dextral, somewhat depressed, relatively large-sized. Whorls 6½, suture deep, apex obtuse, and moderately depressed, with low conical spire. Body whorl rounded, slightly keeled, red-brown in living specimens (Fig. 4D), empty shells are paler (Fig. 3D). Umbilicus very deep and wide. Aperture almost circular, with slightly thickened and weakly expanded lip. GENITAL SYSTEM (n = 3) (Fig. 5D, Table 4). Penis [...]
Fig. 2. Bayesian majority-rule consensus tree summarizing the phylogenetic relationships of speci... more Fig. 2. Bayesian majority-rule consensus tree summarizing the phylogenetic relationships of species of Landouria Godwin-Austen, 1918 based on concatenated COI and 16S sequences. Numbers at nodes indicate branch support based on posterior probability (BI) / bootstrapping (ML) / bootstrapping (NJ). # indicates branches that received <50% ML, NJ bootstrap support. Scale bar = 0.5 substitutions/site.
Currently, the parasitic and endosymbiontic fauna of Corbicula clams remain poorly studied throug... more Currently, the parasitic and endosymbiontic fauna of Corbicula clams remain poorly studied throughout their range. Here, using samples from the Mekong basin, we describe two Symbiocloeon species new to science: Symbiocloeon corbiculinus sp. nov. and Symbiocloeon laoensis sp. nov. Our results and a review of available published data indicate that freshwater bivalve-associated mayflies are narrow host specialists, being associated with one or a few closely related species of freshwater bivalves. The bivalve-associated mayfly larvae have several specific morphological traits compared with free-living species, which include a reduction of integument chitinization and a significant reduction of the surface structures on segments. An increase in area of the respiratory surface of larval tergalia was also recorded. The possible positive and negative effects of mayflies on the clam hosts are discussed. This study is an example of the many possible hidden associations between aquatic species...
Fig. 2. Pearsonia lamphunensis, new species. A, Type locality habitat in dolomitic limestone hill... more Fig. 2. Pearsonia lamphunensis, new species. A, Type locality habitat in dolomitic limestone hill, Lamphun Province; B, Aestivating living snail in natural habitat. Paratype (NHMSU-0007); C, Female partially retracted with the operculum (op) showing; D, vaginal groove (vg) near right tentacle visible.
Fig. 5. Aenigmatoconcha sumonthai, new species, genital system of paratype (NHMSU-0016). Abbrevia... more Fig. 5. Aenigmatoconcha sumonthai, new species, genital system of paratype (NHMSU-0016). Abbreviations: ag = albumen gland, hd = hermaphroditic duct, ut = uterus, pro = prostate gland, vd = vas deferens, ep = epiphallus, erc = epiphallic retractor caecum, p = penis, gs = gametolytic sac, v = vagina, fo = free oviduct, at = atrium.
Tram Chim is a remnant wetland of the plain of reeds that drained prior to reunification. Tram Ch... more Tram Chim is a remnant wetland of the plain of reeds that drained prior to reunification. Tram Chim was most well known for being home to the Eastern Sarus Crane (Grus antigone sharpii) and many other water birds. One of the most essential things here is how to control the water levels effectively. Keeping the water too long and the water levels too high can destroy the ecosystem in Tram Chim while drying up the water and making the area too dried cause fire problems. The first objective was to analyze the hydrology of Tram Chim through a water budget and by assessing the variability and connectivity. The second objective was to survey the types of soils present and understand the processes involved. We found the water velocity at Tram Chim was close to zero. The pH values at Tram Chim indicate that water levels at unit A4 have kept too dry for too long, causing acid soils to oxidize, creating acid water when the wet season occurs. Due to this problem, many managers at Tram Chim att...
This dataset contains the digitized treatments in Plazi based on the original journal article Tan... more This dataset contains the digitized treatments in Plazi based on the original journal article Tanmuangpak, Kitti, Dumrongrojwattana, Pongrat, Tumpeesuwan, Chanidaporn, Tumpeesuwan, Sakboworn (2015): Sinoennea loeiensis, a new species of diapherid microsnail (Pulmonata: Streptaxoidea: Diapheridae) from Phu Pha Lom Limestone Hill, Loei Province, Northeastern Thailand. Raffles Bulletin of Zoology 63: 293-300, DOI: http://doi.org/10.5281/zenodo.4502341
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Papers by Sakboworn Tumpeesuwan