A new cavefish species, Sinocyclocheilus brevibarbatus (Teleostei: Cypriniformes: Cyprinidae), from Guangxi, China

Zhao, Yahui; Lan, Jia-Hu; Zhang, Chunguang

doi:10.1007/978-90-481-3458-8_28

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The upper part of this formation, from which the fossil fruits investigated here were collected, is mainly comprised of bluish gray clayey mudstone, interspersed with a few coal seams and thin sandstones. Its geological age is considered to be the late Oligocene based on mammal fossils including Anthracotherium changlingensis Zhao, Anthracokeryx kwangsiensis Qiu, Heothema sp., and Tragulidae (Zhao, ; Quan et al, ).…”

Section: Methodsmentioning

confidence: 99%

Mummified fruits of Choerospondias nanningensis sp. nov. (Anacardiaceae) from the upper Oligocene of a low latitude site in East Asia

Jin

et al. 2017

J of Sytematics Evolution

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Extant species of Choerospondias (Anacardiaceae) are mainly distributed in the tropical and subtropical areas of East Asia. However, the fossil record indicates that the genus was more widespread in the past, with Cenozoic occurrences in both Europe and Asia. We investigated the pericarp anatomy of well‐preserved mummified fossil fruits of Choerospondias from the upper part of Yongning Formation (late Oligocene) of the Nanning Basin, South China. These fruits are recognized as a new species Choerospondias nanningensis sp. nov. This is the lowest latitude fossil occurrence for the genus, and the first fossil record of this genus from its modern area of distribution (South China), indicating that Choerospondias had spread into its modern area of distribution by the Oligocene. In this study, we also investigated the pericarp anatomical structure of the one extant species of Choerospondias. We found that this genus has an endocarp morphology and anatomy typical of the Spondioideae. This is the first study focusing on the pericarp anatomy of fossil and extant species of Choerospondias simultaneously. This study provides new fossil evidence for further understanding the phylogeny of this genus, and contributes significantly to the knowledge of fruit morphology of the family Anacardiaceae.

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Section: Methodsmentioning

confidence: 99%

Mummified fruits of Choerospondias nanningensis sp. nov. (Anacardiaceae) from the upper Oligocene of a low latitude site in East Asia

Jin

et al. 2017

J of Sytematics Evolution

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“…A potential explanation for this may be that obligate subterranean fishes experience relaxed predation pressures, e.g. from birds [22,56], compared to surface-dwelling fishes. However, a few dorsal neuromasts may be necessary for navigation within caves [57].…”

Section: S G U I L I N E N S I S S J I I S G U a N Y A N G E N S I...mentioning

confidence: 99%

Sensory evolution in a cavefish radiation: patterns of neuromast distribution and associated behaviour inSinocyclocheilus(Cypriniformes: Cyprinidae)

et al. 2022

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The genus Sinocyclocheilus , comprising a large radiation of freshwater cavefishes, are well known for their presence of regressive features (e.g. variable eye reduction). Fewer constructive features are known, such as the expansion of the lateral line system (LLS), which is involved in detecting water movements. The precise relationship between LLS expansion and cave adaptation is not well understood. Here, we examine morphology and LLS-mediated behaviour in Sinocyclocheilus species characterized by broad variation in eye size, habitat and geographical distribution. Using live-staining techniques and automated behavioural analyses, we examined 26 Sinocyclocheilus species and quantified neuromast organ number, density and asymmetry within a phylogenetic context. We then examined how these morphological features may relate to wall-following, an established cave-associated behaviour mediated by the lateral line. We show that most species demonstrated laterality (i.e. asymmetry) in neuromast organs on the head, often biased to the right. We also found that wall-following behaviour was distinctive, particularly among eyeless species. Patterns of variation in LLS appear to correlate with the degree of eye loss, as well as geographical distribution. This work reveals that constructive LLS evolution is convergent across distant cavefish taxa and may mediate asymmetric behavioural features that enable survival in stark subterranean microenvironments.

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“…Species such as the Somalian desert cavefish Phreatichthys andruzzii have been isolated in subterranean environments over millions of years and lack epigean descendants or closely related surface species 6,7 . Others, like the Mexican cave tetra Astyanax mexicanus and fish of the genus Sinocyclocheilus in China have repeatedly colonized subterranean systems, with some cave populations being of more recent origin [8][9][10][11] . Few cave fish species are known in temperate regions [12][13][14] , one of these being the Aach cave loach, representing the first, and currently only known, cave fish in Europe.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic plasticity and genetic differentiation drive troglomorphic character development in European cave loach

Behrmann‐Godel

Roch

Boehm

et al. 2023

Preprint

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Using a cross-fostering experiment, we provide evidence for the contribution of both genetic differentiation and phenotypic plasticity to troglomorphic character development in the recently discovered cave form ofBarbatula barbatula, an evolutionarily young lineage and first cavefish described in Europe, the northernmost record. We established reproducing populations of cave- and surface-dwelling loaches to produce cave, surface, and hybrid offspring and reared the F1 fish in a common garden setting in total darkness (DD) to simulate cave conditions as well as under the natural photoperiod (DL). We observed significant differences in the occurrence and extent of typical troglomorphic target characters among the offspring groups. Regardless of rearing conditions, cave fish exhibited smaller eyes, lighter body coloration, longer barbels, and larger olfactory epithelium than seen in surface fish. Hybrids in both rearing conditions generally showed an intermediate level of these traits. Surface and hybrid DD fish differed from the DL groups, resembling the cave fish phenotype in several traits, including eye size and body pigmentation. In contrast, cave and hybrid DL fish groups resembled surface fish phenotypes. Results confirmed that troglomorphic traits arise from heritable genetic differentiation of cave from surface forms and that phenotypic plasticity contributes to the process of adaptation to novel light conditions.

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A new cavefish species, Sinocyclocheilus brevibarbatus (Teleostei: Cypriniformes: Cyprinidae), from Guangxi, China

Cited by 3 publications

References 3 publications

Mummified fruits of Choerospondias nanningensis sp. nov. (Anacardiaceae) from the upper Oligocene of a low latitude site in East Asia

Mummified fruits of Choerospondias nanningensis sp. nov. (Anacardiaceae) from the upper Oligocene of a low latitude site in East Asia

Sensory evolution in a cavefish radiation: patterns of neuromast distribution and associated behaviour inSinocyclocheilus(Cypriniformes: Cyprinidae)

Phenotypic plasticity and genetic differentiation drive troglomorphic character development in European cave loach

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