Revision of Schizopygopsis chengi Fang 1936 (Cypriniformes: Cyprinidae), with a description of a new subspecies

Zootaxa, Journal Year: 2025, Volume and Issue: 5590(4), P. 481 - 506

Published: Feb. 24, 2025

The species status of Schizopygopsis chengi, which is defined as a subspecies malacanthus, under debate. In the present study, comprehensive morphological and molecular analyses were performed on S. its closest relatives malacanthus other fishes. results showed that chengi did not form sister lineage to with differences in unbranched rays dorsal fin. evidence indicated was valid separated from malacanthus. By examining specimens Marke River, Keke Duoke River Baoxing populations characteristics mouth inferior, transverse oral fissure, relative long predorsal length than geographic populations. monophyly population strongly supported by mitochondrial sequence datasets. Based evidence, specimen considered newly identified named duokeheensis.

Language: Английский

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Sinocyclocheilus xingrenensis (Cypriniformes, Cyprinidae), a new underground fish from Guizhou Province, Southeastern China

Zoosystematics and Evolution, Journal Year: 2025, Volume and Issue: 101(2), P. 419 - 436

Published: Feb. 24, 2025

This study describes a new species, Sinocyclocheilus xingrenensis sp. nov. , collected from cave near Xingren City, Guizhou Province, China. Morphologically, the species can be distinguished 80 currently assigned to genus by combination of following characteristics: absence horn-like structures and indistinct elevation at head-dorsal junction; body scaleless, with irregular black markings scattered above lateral line; tip pectoral fin not reaching pelvic origin; anus; line complete curved, pores 65–77; maxillary barbel anterior margin operculum; six rakers on first gill arch. Phylogenetic trees constructed based mitochondrial genes indicate that represents an independent evolutionary lineage relatively large genetic differences 2.8–9.0% for Cyt b 2.7–8.5% ND4.

Language: Английский

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A new species of Sinocyclocheilus (Cypriniformes, Cyprinidae) from the Beipan-Jiang in Guizhou, China

ZooKeys, Journal Year: 2025, Volume and Issue: 1238, P. 99 - 114

Published: May 13, 2025

Sinocyclocheiluszhenningensissp. nov. from the Dabang-He of Beipan-Jiang Basin in Zhenning County, Guizhou Province, China, is described based on morphological and molecular evidence. The new species can be distinguished morphologically all congeners this genus by: (1) normal eyes (5.8%-8.2% SL), presence pigmentation, with a humpback no horn structure; (2) pelvic fin rays ii-8, dorsal-fin iii-8, stiff stout last unbranched ray; (3) body depth (26.5%-30.1% SL) covered irregular black spots, scaled, but scales buried beneath skin; (4) lateral line complete, slightly curved ventrally, 42-47 pored scales; (5) pectoral short, not reaching anterior base fin. Based mitochondrial cytochrome b (Cytb) gene phylogenetic tree, S.zhenningensis sp. strongly supported as sister to S.cyphotergous-S.multipunctatus subclade. minimum genetic distance between Sinocyclocheiluszhenningensis its congeneric 3.8%.

Language: Английский

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Description of a new troglobitic Sinocyclocheilus (Pisces, Cyprinidae) species from the upper Yangtze River Basin in Guizhou, South China

Zoosystematics and Evolution, Journal Year: 2024, Volume and Issue: 100(2), P. 515 - 529

Published: May 14, 2024

Sinocyclocheilus guiyang , a new troglobitic species from subterranean tributary of the upper Yangtze Basin in Guiyang City, Guizhou Province, China is described present study. The distinguishable its congeneric by combination following characters: tip maxillary barbel reaching to posterior edge orbit; forehead horn absent; eye absent (or highly reduced) and pectoral fins not significantly extending beyond base pelvic fin. Molecular evidence, based on mitochondrial cytochrome b (cyt ) gene, further supports validity also reveals close relationship with S. cyphotergous multipunctatus punctatus sanxiaensis. In addition, faces high risk extinction, underscoring urgency for habitat protection measures within limited range.

Language: Английский

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Sinocyclocheilus xiejiahuai (Cypriniformes, Cyprinidae), a new cave fish with extremely small population size from western Guizhou, China

ZooKeys, Journal Year: 2024, Volume and Issue: 1214, P. 119 - 141

Published: Oct. 3, 2024

This study describes a new species, Sinocyclocheilus xiejiahuai sp. nov ., discovered within cave located in Hongguo Town, Panzhou City, Guizhou Province, southwestern China, with the type locality Nanpanjiang River basin. Phylogenetic trees reconstructed based on mitochondrial genes show that species represents an independent evolutionary lineage large genetic differences, 1.9%–13.8% Cyt b , from congeners. Morphologically, this can be differentiated 79 currently classified under genus by several characteristics: absence of horn-like structures and indistinct elevation at head-dorsal junction, irregular black markings body lateral scaleless, eyes large, eye diameter 13% head length, dorsal-fin rays, iii, 6½, last unbranched ray strong, serrations along posterior margin, pectoral-fin i, 13, anal-fin 5, pelvic-fin 7, line pores 74, gill rakers well developed, nine first arch, pectoral fins short, tip not reaching to origin. The number has been increased 80 since description species.

Language: Английский

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Research advances in diversity and conservation science of freshwater fish in China

Journal of Fish Biology, Journal Year: 2024, Volume and Issue: 104(2), P. 343 - 344

Published: Feb. 1, 2024

In China, as elsewhere, freshwater fishes are facing considerable threats due to climate change and anthropogenic activities, including habitat modification, water pollution, over-fishing, non-native fish introductions (Best, 2019; Feio et al., 2023). As a result, the taxonomic, genetic, functional diversities of in China have been negatively impacted. To fulfill China's Biodiversity Conservation Strategy Action Plan (2011–2030), it is important comprehensive understanding aquatic ecosystems especially with regard threatened species protected areas. This essential inform management strategies mitigate impacts on critical fauna protect conserve endemic native species. special issue includes two papers dealing diversity at national regional scale, four regarding new taxa or records fishes, five studies about life history general biology focused technologies fisheries conservation. The third Red List assessment Chinese was conducted recently results published by Zhang Cao (2021); checklist updated but limited case no recommendations for conservation fishes. al. (2024) provided an overview their status based work (2021), they highlighted challenges attempts using suggestions improve ecosystems, thereby Functional biodiversity impact exotic local rarely evaluated thoroughly riverine scale. Lin study schemed mechanistic model reveal Minjiang River, largest river southeastern suggested that altered community significantly if accounted 2% total ecosystem. About 1591 were recorded up until end 2020, 20 described annually (Cao 2024). However, both numbers must be underestimate, rare upstream areas rivers most remote. describing records, taxa, phylogeny (Guo, Cao, (2024); Hu 2024; Li Luo Guo, Leptobotia spp. upper Qiantang-Jiang River where very much underestimated. Morphological molecular approaches used describe cave species, Sinocyclocheilus xingyiensis southwest part (Luo 2024), confirm record Schizothorax richardsonii southern slope Central Himalayas surveys (Li quaternary climatic oscillation, conjunction ecological traits lineage diversification time, shaped contemporary phylogenetic patterns stone loaches Himalayas. Five this focus ecotoxicology China. Life-history Japanese eels Anguilla japonica remain poorly understood. Shuai 6-year study, expanding knowledge life-history preferences Pearl implications eel habitat. Qin reported interpopulation ontogenetic trophic niche shifts mangrove predator Acentrogobius viridipunctatus role plasticity dynamic ecosystems. environmental biological condition Chang-Jiang great concern Yimer studied commercially Coilia brachygnathus Lake Honghu found had short span, early sexual maturity, relatively fast growth rate, which resources lakes situated middle lower reaches River. He investigated key critically endangered Ptychidio jordani, not known previously strategy policy development. Chu, safe concentrations common biocides, copper, zinc, methylene blue treat disease such Brachymystax tsinlingensis, benefited from resource protection restoration measures. New develop sustainable effective strategies. Shen developed automatic image-processing programme automatically track count technique fuses K-nearest neighbor background subtraction DeepSort target tracking, could replace time-consuming semi-automatic efficiency imaging sonar data processing. negative effect dam construction, Song Xie substratum roughening swimming capacity, oxygen consumption, behavior wangchiachii, indicated performance improved presence rough energetic costs fish.

Language: Английский

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Skin transcriptomic correlates of cave-dwelling Sinocyclocheilus cavefish

Frontiers in Ecology and Evolution, Journal Year: 2023, Volume and Issue: 11

Published: Oct. 25, 2023

Introduction With 78 species, Sinocyclocheilus cavefish constitute the largest radiation in world. They exhibit remarkable morphological diversity across three habitat types: surface (surface morphs, normal-eyed, variably colored), exclusively-cave-dwelling (stygobitic eyeless, depigmented), and intermediate between cave (stygophilic micro-eyed, partially depigmented). Distinctive traits of include variations eye skin conditions associated with their habitat, despite role sensing environmental changes, its correlates are less understood, compared to well-studied conditions. Methods Here, we analyzed correlation morphology utilizing transcriptomics-based methods. We generated RNA-sequencing data for nine species integrated those existing from five additional species. These 14 represent primary clades major habitats these cavefish. Result identified 7,374 orthologous genes transcriptome data. Using a comparative transcriptomics approach, 1,348 differentially expressed (DEGs) were morphotypes. GO KEGG enrichment analyses suggested that mainly involved energy metabolism, immunity oxidative stress-related functions. Genes related immune, apoptotic, necrotic functions through positive selection analysis genes. The maximum likelihood phylogenetic tree, based on 1,369, single-copy was largely concordant currently established RAD-seq mt-DNA phylogenies. Species higher dependence present lighter coloration, fewer dark blotches, diminished scale coverage. also found differences gene expression effects may have contributed degradation color scales. Discussion Our study highlights significance shaping pigmentation variation, while offering insights into molecular mechanisms driving habitat-specific adaptations . findings underscore transcriptional variation adapting diverse environments contribute future studies evolution ecology

Language: Английский

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Habitat correlates of cave-dwelling: A radiation-scale analysis of skin traits and comparative transcriptomics of theSinocyclocheiluscavefish

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2023, Volume and Issue: unknown

Published: July 17, 2023

ABSTRACT With 78 species, Sinocyclocheilus cavefish constitute the largest radiation in world. They exhibit remarkable morphological diversity across three habitat types: surface (Surface morphs, Normal-eyed, variably colored), exclusively-cave-dwelling (Stygobitic Eyeless, depigmented), and intermediate between cave (Stygophilic Micro-eyed, partially depigmented). Distinctive traits of include variations eye skin conditions associated with their habitat, despite role sensing environmental changes, its correlates are less understood, compared to well-studied conditions. Here, we analyzed correlation morphology utilizing transcriptomics-based methods. We generated RNA-sequencing data for nine species integrated those existing from five additional species. These 14 represent primary clades major habitats these cavefish. Data on color scale were 7374 orthologous genes identified. Using a comparative transcriptomics approach, identified 1,348 differentially expressed (DEGs) morphotypes. GO KEGG enrichment analyses suggest that have evolved different strategies energy metabolism, immunity, oxidative stress habitats. also found 329 positive selection (PSGs) mainly involved apoptosis, necrosis, indicating potential adaptations The maximum likelihood phylogenetic tree, based 1369 single-copy was largely concordant currently established RAD-seq mt-DNA phylogenies, but few exceptions. Species higher dependence present lighter coloration, fewer dark blotches, diminished coverage. PCA cluster analysis suggested cave-dwelling characterized by absence black similar expression patterns, convergence adaptation. Variations tyrosine metabolism may explain pigmentation differences among diverse Our study highlights significance shaping variation, while offering insights into molecular mechanisms driving habitat-specific . findings underscore transcriptional variation adapting environments contribute future studies evolution ecology

Language: Английский

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