Morphological and Molecular Data Reveal Two New Cryptic Spider Species of the Pholcus yichengicus Species Group (Araneae, Pholcidae) from Central China

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  Morphological and Molecular Data Reveal Two New Cryptic Spider Species of the Pholcus yichengicus Species Group (Araneae, Pholcidae) from Central China  Abstract Two new cryptic species from central China, belonging to the Pholcus yichengicus species group, were identified using an integrative approach combining morphological and three molecular species delimitation methods, and incorporating data from five related previously described species. These two new species are named Pholcus chengkou sp. nov. and P. yanan sp. nov. DNA barcodes were generated for the two new species to calculate p-distances and K2P distances, thus confirming their identities alongside the five previously described species. Additionally, revised diagnoses for the five previously described species and a distribution map encompassing all the species discussed are provided. Yan, Mei-Chen, and Zhi-Yuan Yao. 2026. "Morphological and Molecular Data Reveal Two New Cryptic Spider Species of the Pholcus y...

Comparative Analysis of Mitochondrial Genome from Phormictopus cancerides (Arachnida: Theraphosidae) with Phylogenetic Implications

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Comparative Analysis of Mitochondrial Genome from Phormictopus cancerides (Arachnida: Theraphosidae) with Phylogenetic Implications

Abstract

Tarantulas represent a highly diverse taxonomic group and play a crucial role in ecosystems. To gain a deeper understanding of the evolutionary relationships within the family Theraphosidae, in this study, we characterized the mitochondrial genome (mitogenome) of Phormictopus cancerides for the first time. The mitogenome is a typical circular double-stranded molecule, with a size of 13,776 bp. P. cancerides exhibited an A/T nucleotide preference (61.9–68.5% A + T content), with their rRNAs and tRNAs showing higher values than PCGs and the CR. The genes and the gene order were consistent with other Theraphosidae mitogenomes. The mitogenome was compacted and showed a bias for A/T. Ka/Ks analyses showed that the ND3 gene had the highest evolutionary rate, while the COX1 gene displayed a relatively slower evolution. Our phylogenetic analysis based on mitogenomes showed the subfamily Theraphosinae is closely related to the subfamily Harpactirinae and the subfamily Selenocosmiinae. Our results could contribute to the study of relationships within the family Theraphosidae and lay the foundation for further studies on tarantulas.

Chen, Hongjian, Wei Xu, Hongyi Liu, Yiwen Yang, and Ming Gao. 2025. "Comparative Analysis of Mitochondrial Genome from Phormictopus cancerides (Arachnida: Theraphosidae) with Phylogenetic Implications" Current Issues in Molecular Biology 47, no. 6: 448. https://doi.org/10.3390/cimb47060448