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Keywords = heptageniid species

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12 pages, 6018 KiB  
Article
The Real Characters of Heptagenia ngi Hsu (1936) from China Representing a New Genus (Ephemeroptera: Heptageniidae)
by Dewen Gong, Wei Zhang and Changfa Zhou
Diversity 2022, 14(12), 1027; https://doi.org/10.3390/d14121027 - 24 Nov 2022
Viewed by 2123
Abstract
A very common and early named mayfly species from China, Heptagenia ngi Hsu, 1936, has no exact descriptions of its imago nor nymph, so its generic status is not clear. Based on detailed re-descriptions and pictures of all its stages from fresh materials, [...] Read more.
A very common and early named mayfly species from China, Heptagenia ngi Hsu, 1936, has no exact descriptions of its imago nor nymph, so its generic status is not clear. Based on detailed re-descriptions and pictures of all its stages from fresh materials, it is transferred into a new genus Maculogenia Zhou, gen. nov. Its nymph has conspicuous pale-dark colored body, slightly concave posterior margin of head, scattered simple setae on ventral maxillae, spines and very fine hair-like setae on caudal filaments. Similarly, its imago also has remarkable dark stripes and dots on the pale body, small median titillators and short first segment of foretarsi, apically expanded penes without any spines. It is similar to the genera Electrogena, Thamnodontus, and Parafronurus but they can be differentiated easily by above selected key structures. Full article
(This article belongs to the Special Issue Freshwater Zoobenthos Biodiversity, Evolution and Ecology)
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15 pages, 8855 KiB  
Article
Comparative Mitogenomic Analysis of Heptageniid Mayflies (Insecta: Ephemeroptera): Conserved Intergenic Spacer and tRNA Gene Duplication
by Ran Li, Zhiming Lei, Wenjuan Li, Wei Zhang and Changfa Zhou
Insects 2021, 12(2), 170; https://doi.org/10.3390/insects12020170 - 16 Feb 2021
Cited by 17 | Viewed by 3165
Abstract
Large intergenic spacers and tRNA gene duplications have been reported in several insect groups, although little is known about mitogenomes of mayflies. Here, we determined complete mitogenomes of ten heptageniid species and systemically analyzed their mitogenomic features. Both a conserved intergenic spacer (IGS) [...] Read more.
Large intergenic spacers and tRNA gene duplications have been reported in several insect groups, although little is known about mitogenomes of mayflies. Here, we determined complete mitogenomes of ten heptageniid species and systemically analyzed their mitogenomic features. Both a conserved intergenic spacer (IGS) and trnM duplication were detected in those mitogenomes. The IGS, which was observed in heptageniids, could be further folded into a stable stem–loop structure. The tRNA gene duplication was found in almost all analyzed mitogenomes, and a unique gene block trnI-trnM-trnQ-trnM-ND2 was also discovered. Our analysis demonstrates that the heptageniid gene arrangement pattern can be explained by the tandem duplication-random loss (TDRL) model. Phylogenetic analyses using both Bayesian inference (BI) and maximum likelihood (ML) methods based on the nucleotide and amino acid sequence data recovered the genus Epeorus as monophyletic with strong support. Our results provide a better understanding of mitogenomic evolution in Heptageniidae, as well as novel molecular markers for species identification of mayflies. Full article
(This article belongs to the Section Insect Molecular Biology and Genomics)
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