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Saturday, September 28th, 2024
| Time | Event | ||||||
| 2:18p | [Ichthyology • 2024] Lefua nishimurai • Integrative Taxonomy revealed A New Species of Lefua (Cypriniformes: Nemacheilidae) from Fukui Prefecture, central Japan
Abstract Eight-barbel loaches belonging to the genus Lefua have diverged into seven species in freshwaters of East Asia. Recent studies have discovered a new population in the Kuzuryu River drainage system of Fukui Prefecture, central Japan. Based on the results of the genetic analyses and morphological comparisons, we describe this population as a new species, Lefua nishimurai sp. nov. Body width, interorbital width, orbit diameter, preanal length, snout length, and the newly examined head width greatly contributed to the discrimination between L. torrentis, L. tokaiensis and L. nishimurai sp. nov. The new species can be distinguished from other congeners by combining the following characteristics: 1) eyes positioned dorsally on the head; 2) a narrow conspicuous longitudinal mark between the base of the outer rostral barbel and the eye; 3) small dark spots on the body, dorsal, and caudal fins; 4) a small dorsal fin and eye diameter; and 5) black spots above and below the base of the caudal fin. Based on the phylogenetic relationships of the genus, L. nishimurai sp. nov. is estimated to have diverged early from its common ancestor in central Japan. Understanding the natural history of this new species and implementing conservation measures are crucial because of its narrow, fragmented distribution and presence in vulnerable habitats. Key Words: endangered species, freshwater fish, inland water, nemacheilid loach, nuclear phylogeny, species richness
Lefua nishimurai Katayama, sp. nov. New Standard Japanese name: Reihoku-nagare-hotoke-dojyô Diagnosis: Lefua nishimurai sp. nov. can distinguished from all other species of Lefua by combing following features: absence of rhomboid or triangular dark blotches on middle of caudal fin base; absence of black longitudinal stripe on both body sides in mature males; absence of dusky cross bars on dorsal area of body; absence of dusky bar beside dorsal fin base; eyes located dorsally on head; narrow conspicuous longitudinal mark between base of outer rostral barbel and eye; small dorsal fin; small orbit diameter (6.3–11.2% of head length); small value of interorbital width relative to body width (28.1–39.4%); dark spots dorsally and ventrally on caudal fin base; small dark brown spots from snout to caudal peduncle; small dark spots on dorsal and caudal fins (approximately same size as eyes). Etymology: The specific name is dedicated to Toshiaki Nishimura, who first morphologically distinguished this new species.
Yuta Katayama and Naoto Sawada. 2024. Integrative Taxonomy revealed A New Species of Lefua (Teleostei, Nemacheilidae) from Fukui Prefecture, Japan. Evolutionary Systematics. 8(2): 247-260. DOI: doi.org/10.3897/evolsyst.8.131002 | ||||||
| 2:28p | [Botany • 2024] Sarcolobus busbanianus & S. flavus (Apocynaceae: Asclepiadoideae: Marsdenieae) • Phylogenetic Positions of Thai Members of Gymnema, Gymnemopsis and Sarcolobus, and Two New Sarcolobus Species uncovered by Morpho-molecular Evidence
Abstract The present study assesses the phylogenetic position of certain Thai members of Gymnema, Gymnemopsis, and Sarcolobus in relation to other known Marsdenieae species. Fifteen accessions newly sequenced from Thailand were added to the dataset of the homologous sequences of 125 accessions of Marsdenieae downloaded from GenBank. In our molecular phylogeny, almost all the delimited major clades and their relationships are largely congruent with those revealed in previous studies. The monophyly of Gymnema (including the former Jasminanthes species) and that of Sarcolobus, as presently circumscribed, are confirmed. The new accessions of these two genera from Thailand are well grouped with the members of their respective genera. Our analyses provide the first molecular evidence for recognition of Gymnemopsis, a small Asian genus that has never been included in the previous phylogenetic studies, as a distinct genus. All elements of Gymnemopsis are retrieved as a well-supported monophyletic group that is strongly supported as sister to Lygisma, another small Asian genus that most closely resembles it in growth habit, color of latex, indumentum on plant parts, corona structure and follicle traits. Combined molecular phylogenetic, morphological and ecological data also support recognition of two new Sarcolobus species from Thailand, Sarcolobus busbanianus sp. nov. and S. flavus sp. nov. Similarities and differences between these new species and their close relative, S. carinatus, are discussed. In addition, this study also reveals the first record for Thailand of Gymnema lacei. Keys to the species of Gymnemopsis (for all members of the genus), Gymnema and Sarcolobus (for Thai members of these genera) are provided. Keywords: CpDNA, ITS, Mainland Southeast Asia, Marsdenia, Molecular phylogeny, Morphological taxonomy
Sarcolobus busbanianus A.Kidyoo & Kidyoo, sp. nov. Etymology This species was named in honour of Assoc. Prof. Busban Na Songkhla, a senior instructor in the Department of Botany, Faculty of Science, Chulalongkorn University, who has made important contributions to plant taxonomic knowledge in Thailand. Sarcolobus flavus A.Kidyoo & Kidyoo, sp. nov. Etymology The specific epithet ‘flavus’ refers to the bright yellow color of its flowers. Manit Kidyoo, Aroonrat Kidyoo and Doyle McKey. 2024. Phylogenetic Positions of Thai Members of Gymnema, Gymnemopsis and Sarcolobus (Apocynaceae, Asclepiadoideae, Marsdenieae), and Two New Sarcolobus Species uncovered by Morpho-molecular Evidence. Journal of Plant Research. DOI: doi.org/10.1007/s10265-024-01562-z | ||||||
| 2:29p | [Botany • 2024] Begonia bijantiae (Begoniaceae, sect. Diploclinium) • A New Species from Arunachal Pradesh, northeast India and notes on Begonia ovatifolia
Abstract Repeated expeditions conducted in Arunachal Pradesh resulted in the discovery of a unique Begonia, Begonia bijantiae D.Borah, Taram & M.Hughes, belonging to Begonia sect. Diploclinium. This species is described here based on collections made in Hunli, Lower Dibang Valley District of Arunachal Pradesh. Additionally, a poorly known species, Begonia ovatifolia is illustrated with first-ever published photographs, accompanied by an expanded description based on a collection from West Kameng district of the state. Keywords: Begonia, Eastern Himalaya, Northeast India, taxonomy, new species   Begonia bijantiae D.Borah, Taram & M.Hughes  Dipankar Borah, Momang Taram, Niku Das and Mark Hughes. 2024. Begonia bijantiae, A New Species of Begonia from Arunachal Pradesh, northeast India and notes on Begonia ovatifolia. Nordic Journal of Botany. DOI: doi.org/10.1111/njb.04493  |
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