Interspecies and intraspecific variability in the trilobites
            <i>Duyunaspis</i>
            and
            <i>Balangia</i>
            from the Cambrian Series 2 (Stage 4) of Jianhe, South China

Chen, Zhengpeng; Zhao, Yuanlong; Yang, Xing; Esteve, Jorge; Liu, Xiong; Chen, Shengguang; Ren, Feng

doi:10.18261/let.55.4.5

Cited by 3 publications

(6 citation statements)

References 25 publications

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“…balangensis and D . duyunensis have been confirmed as two separate species ( Qian, 1961 ; Zhou et al, 1977 ; Peng, 2020 ; Chen et al, 2022 ), and thus both of them meet the requirements in (1) and (3). If B .…”

Section: Discussionmentioning

confidence: 96%

“…6 ). The presence or absence of the glabellar furrow is one of the main differences between Balangia and Duyunaspis according geometric morphometrics ( Chen et al, 2022 ). The glabellar furrows of B .…”

Section: Discussionmentioning

confidence: 99%

“…balangensis and D . duyunensis ( Chen et al, 2022 ) implies that the time, D . duyunensis diverged from B .…”

Section: Discussionmentioning

confidence: 99%

“…The oryctocephalid trilobites Balangia and Duyunaspis are currently found only on the Jiangnan Slope Belt of South China ( Qian, 1961 ; Zhou et al, 1977 ; Zhang et al, 1980 ; Yuan, Zhao & Li, 2001 ; Yuan et al, 2002 ; McNamara, Yu & Zhou, 2006 ; Lei & Peng, 2014 ; Lei, 2016 ; Dai et al, 2017 ; Peng et al, 2017 ; Chen et al, 2018 ; Peng, 2020 ; Chen et al, 2022 ). B .…”

Section: Methodsmentioning

confidence: 99%

“…jianheensis occurs in siliciclastic rocks from the Tsinghsutung Formation ( Fig. 1 ) in eastern Guizhou ( Chen et al, 2018 ; Chen et al, 2022 ). Both the Balang Formation (eastern Guizhou, southern Guizhou and western Hunan) and the Tsinghsutung Formation (eastern Guizhou) are thought to represent deep-water slope deposits ( Peng, 2018 ).…”

Section: Methodsmentioning

confidence: 99%

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Life cycle evolution in the trilobitesBalangiaandDuyunaspisfrom the Cambrian Series 2 (Stage 4) of South China

Chen

Zhao

Yang

et al. 2023

PeerJ

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The evolution process can be reconstructed by tracking the changes in the dynamic characters of life cycles. A number of related trilobites from the Cambrian of South China provide additional information for the study of trilobite evolutionary patterns, which has been hampered by previous incomplete fossil record though. Here, Balangia and Duyunaspis represent related Cambrian oryctocephalid trilobites from South China, are comprehensively discussed over the ontogeny, and the results show that, from B. balangensis via D. duyunensis to D. jianheensis, their exoskeletal morphology shows a directional evolution. Based on the direction of evolutionary changes in the development of Balangia and Duyunaspis, we speculate that Duyunaspis likely evolved from Balangia instead of Balangia evolved from Duyunaspis, as was previously assumed. This inference is also supported by the phylogenetic tree. This research provides not only a better understanding of the mechanisms of evolution in trilobites, but also new insights for the relationship between developmental evolutionary changes and phylogeny in trilobites.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

“…balangensis and D . duyunensis ( Chen et al, 2022 ) implies that the time, D . duyunensis diverged from B .…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Life cycle evolution in the trilobitesBalangiaandDuyunaspisfrom the Cambrian Series 2 (Stage 4) of South China

Chen

Zhao

Yang

et al. 2023

PeerJ

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Unveiling the ventral morphology of a rare early Cambrian great appendage arthropod from the Chengjiang biota of China

Schmidt,

Hou,

Mai

et al. 2024

BMC Biol

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Background The early Cambrian arthropod clade Megacheira, also referred to as great appendage arthropods, comprised a group of diminutive and elongated predators during the early Palaeozoic era, around 518 million years ago. In addition to those identified in the mid-Cambrian Burgess Shale biota, numerous species are documented in the renowned 518-million-year-old Chengjiang biota of South China. Notably, one species, Tanglangia longicaudata, has remained inadequately understood due to limited available material and technological constraints. In this study, we, for the first time, examined eight fossil specimens (six individuals) utilizing state-of-the-art μCT and computer-based 3D rendering techniques to unveil the hitherto hidden ventral and appendicular morphology of this species. Results We have identified a set of slender endopodites gradually narrowing distally, along with a leaf-shaped exopodite adorned with fringed setae along its margins, and a small putative exite attached to the basipodite. Our techniques have further revealed the presence of four pairs of biramous appendages in the head, aligning with the recently reported six-segmented head in other early euarthropods. Additionally, we have discerned two peduncle elements for the great appendage. These findings underscore that, despite the morphological diversity observed in early euarthropods, there exists similarity in appendicular morphology across various groups. In addition, we critically examine the existing literature on this taxon, disentangling previous mislabelings, mentions, descriptions, and, most importantly, illustrations. Conclusions The μCT-based investigation of fossil material of Tanglangia longicaudata, a distinctive early Cambrian euarthropod from the renowned Chengjiang biota, enhances our comprehensive understanding of the evolutionary morphology of the Megacheira. Its overall morphological features, including large cup-shaped eyes, raptorial great appendages, and a remarkably elongated telson, suggest its potential ecological role as a crepuscular predator and adept swimmer in turbid waters.

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Variation of the Tegmen and Cercus in Sinopodisma rostellocerca (Orthoptera: Acrididae: Melanoplinae) with Proposal of a New Synonym

Qiu,

Yan,

Wang

et al. 2024

Insects

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Intraspecific variation is ubiquitous from individual traits to population level and plays an important role in a variety of fields. However, it is often ignored by systematists and comparative evolutionary biologists. In view of the limited knowledge of intraspecific variation, morphology-based identification has hindered the recognition of species borders and led to a great number of problems in the field of taxonomy and systematics. In this study, the intraspecific variation of the tegmen and cercus in Sinopodisma rostellocerca was examined, the variation patterns were summarized and the relationship between S. rostellocerca and S. hengshanica was discussed. The results showed that the intraspecific variation in the tegmen and male cercus was mainly manifested in the length and shape of the apical margin and dorso- and ventro-apical angles; this substantial variation occurred not only among intrapopulation individuals but also between the different sides of the same individuals, and all types of variation in S. hengshanica fell into the range of variation in S. rostellocerca, leading to the disappearance of the boundary between the two species. Therefore, S. hengshanica was herein considered as a new junior synonym of S. rostellocerca.

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Interspecies and intraspecific variability in the trilobites Duyunaspis and Balangia from the Cambrian Series 2 (Stage 4) of Jianhe, South China

Cited by 3 publications

References 25 publications

Life cycle evolution in the trilobitesBalangiaandDuyunaspisfrom the Cambrian Series 2 (Stage 4) of South China

Life cycle evolution in the trilobitesBalangiaandDuyunaspisfrom the Cambrian Series 2 (Stage 4) of South China

Unveiling the ventral morphology of a rare early Cambrian great appendage arthropod from the Chengjiang biota of China

Variation of the Tegmen and Cercus in Sinopodisma rostellocerca (Orthoptera: Acrididae: Melanoplinae) with Proposal of a New Synonym

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