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Wednesday, September 10th, 2025
| Time | Event | ||||||
| 5:26a | [Botany • 2025] Goniothalamus obovatus (Annonaceae) • A New Species from southern Thailand
Abstract Goniothalamus obovatus Chaowasku & Damth., a new species of Annonaceae from southern Thailand is described and illustrated. It is morphologically most similar to G. banii endemic to Vietnam, but can be distinguished from it by possessing terete (vs ± angular) branches, a subcordate to cordate (vs rounded) leaf base, shorter inner petals, an inner petal apex that is ± acute (vs long-acuminate), a lower ratio of inner petal to outer petal length, fewer stamens per flower, a staminal connective apex that is ± apiculate (vs rounded), fewer carpels per flower and densely hairy (vs glabrous) ovaries. The conservation status of the new species is provisionally assessed as Data Deficient. Keyword: Annoninae, Goniothalamus, Goniothalamus banii, new species, Satun, taxonomy, Thailand  
Goniothalamus obovatus Chaowasku & Damth., sp. nov. Diagnosis: The new species morphologically most similar to G. banii B.H.Quang, R.K.Choudhary & V.T.Chinh endemic to Vietnam (Quang et al., 2016) mainly in leaf, sepal and outer petal shape, as well as number of ovules per ovary, but distinguishable from it by having terete (vs ± angular) branches, a subcordate to cordate (vs rounded) leaf base, shorter inner petals, an inner petal apex that is ± acute (vs long-acuminate), a lower ratio of inner petal to outer petal length, fewer stamens per flower, a staminal connective apex that is ± apiculate (vs rounded), fewer carpels per flower and densely hairy (vs glabrous) ovaries (Table 1). Etymology: The specific epithet refers to the obovate
leaves of this species. Anissara Damthongdee, Pimjan Narintarangkul Na Ayutthaya, Kithisak Chanthamrong, Setthikij Ruangritthidech, Chattida Wiya and Tanawat Chaowasku. 2025. Goniothalamus obovatus (Annonaceae), A New Species from southern Thailand. Taiwania. 70(4); 631-634. DOI: 10.6165/tai.2025.70.631 [04 September 2025] | ||||||
| 1:40p | [Botany • 2025] Primulina longanica (Gesneriaceae) • A New Species from a limestone area of Guangxi, China
Abstract Primulina longanica F.Wen & W.C.Chou, a new species of Gesneriaceae endemic to Guangxi, China, is described and illustrated. The new species is morphologically similar to P. yangshuoensis F.Wen & Y.G.Wei, but differs in several key characteristics, including the presence of stolons, indumentum of petiole, peduncle, filament, ovary, and style, bract shape, and corolla length. The species is currently known only from its type locality, in Long’an County, Guangxi, where it grows on limestone cliffs in a subtropical monsoon climate area. Due to its limited distribution and over-collection for ornamental purposes, P. longanica is provisionally assessed as Critically Endangered (CR) according to the IUCN Red List Categories and Criteria. Keyword: Flora of Guangxi, New taxon, Primulina yangshuoensis, Taxonomy
Wen-Qing Ma, Li-Li Shen, Wei-Chuen Chou, Tao-Ran Chen and Fang Wen. 2025. Primulina longanica sp. nov. (Gesneriaceae) from a limestone area of Guangxi, China. Taiwania. 70(4); 639-645. DOI: 10.6165/tai.2025.70.639 [08 September 2025] | ||||||
| 2:13p | [Ichthyology • 2025] Oreonectes guidongensis • A New Species from eastern Guangxi within the Oreonectes polystigmus complex (Cypriniformes: Nemacheilidae) by integrating morphological and genetic evidence
Abstract We describe Oreonectes guidongensis sp. nov., a new species collected from Hezhou City, Guangxi Zhuang Autonomous Region, China. Morphologically, it is distinguished from all congeners by the following combination of characters: six branched pelvic-fin rays; seven branched dorsal-fin rays; tip of pelvic fin not reaching the anus; a well-developed posterior chamber of the air bladder; 14–16 branched caudal-fin rays; 10 inner gill rakers on the first gill arch; and a distance between the posterior base of the pectoral fin and the anterior base of the pelvic fin of 18.8–27.9% of standard length. Phylogenetic analysis based on the mitochondrial cytochrome b gene supports the distinctiveness of this species, revealing genetic distances of 5.4–8.5% from its congeners. The discovery of Oreonectes guidongensis sp. nov. underscores the need to re-evaluate O. polystigmus as a potential species complex to better understand the genus’s biodiversity. Key Words: Cryptic species, morphology, taxonomy, phylogeny
Oreonectes guidongensis Luo, Yu, Liao & Zhou, sp. nov. Etymology. The species name “guidongensis” refers to its distribution in Guangxi (广西), also known as Gui (桂), specifically indicating that the species is found in the eastern region of Guangxi, China. The suggested English name for this species is the Guidong Hilly Loach, and its Chinese name is Guì Dōng Lǐng Qiū (桂东岭鳅). Diagnosis. Comparative data between new species and all nine known species within the genus Oreonectes are provided in Table 4. Oreonectes guidongensis sp. nov. can be distinguished from O. platycephalus and O. zhangi by the well-developed posterior chamber of air bladder (vs. reduced), from O. damingshanensis, O. guananensis, and O. luochengensis by six branched plevic-fin rays (vs. 7 or 7–8), from O. guilinensis and O. yuedongensis by seven branched dorsal-fin rays (vs. 6), from O. andongensis 10 inner gill rakers on the first gill arch (vs. 11–12), and from O. polystigmus by the tip of pelvic fin not reaching the anus (vs. reaching the anus), distance between the posterior base of the pectoral fin and the anterior base of the pelvic fin is 18.8–27.9% of standard length (18.8–27.9% HL vs. 27.9–34.1%), and five supratemporal pores (vs. 3) (Figs 4, 5). Mei Liao, Jing Yu, Tao Luo, Chang-Ting Lan, Jia-Jun Zhou, Ning Xiao and Jiang Zhou. 2025. Description of A New Species from eastern Guangxi within the Oreonectes polystigmus complex (Cypriniformes, Nemacheilidae) by integrating morphological and genetic evidence. Zoosystematics and Evolution. 101(4): 1763-1774. DOI: doi.org/10.3897/zse.101.160089 |
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