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Issue: Vol. 3 No. 1: March 2026
Type: Review
Published: 2026-03-30
DOI: 10.11646/mesozoic.3.1.1
Page range: 1-43
Abstract views: 23
PDF downloaded: 8

Looks can be deceiving: convergent hair tufts mask a new lineage of Cretaceous mites

State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
Bioeconomy Science Institute, Manaaki Whenua – Landcare Research Group, Private Bag 92170, Auckland, New Zealand; School of Biological Sciences, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing College, University of Chinese Academy of Sciences, Nanjing 211135, China
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
Cretaceous mites convergent evolution Acarohystricidae burmese amber Parasitengona

Abstract

The similar morphological traits produced by convergent evolution represent a primary source of taxonomic confusion. The porcupine-like mites from mid-Cretaceous Burmese amber, which can be readily recognized by four tufts of extremely long setae on their backs, have recently been reported by several researchers as members of the family Chyzeriidae Womersley, 1954. However, detailed morphological examination of newly discovered specimens reveals that these similarities are superficial. Some important higher-level taxonomic characters (e.g., retractable gnathosoma, needle-like chelicerae, and two pairs of genital acetabula) of these extinct mites are not clearly presented in reported specimens, obscuring their true phylogenetic position. Here we demonstrate that the hair tufts in these Cretaceous mites represent a case of convergent evolution and that the fossils belong to a previously unrecognized lineage. We revisit 62 new fossils of this group using various imaging technologies, including stereomicroscopy, fluorescence microscopy, and laser confocal scanning microscopy, and we also examined three slide-mounted specimens from three extant families: Chyzeriidae Womersley, 1954, Smarididae Kramer, 1878, and Calyptostomatidae Oudemans, 1923, were also examined for morphological comparison. Newly discovered morphological evidence supports the establishment of a new family Acarohystricidae fam. nov. to accommodate these extinct Cretaceous mites, which is placed in its own superfamily—Acarohystricoidea superfam. nov.—distantly related to the extant Chyzeriidae. A new genus and species, Acarohystrix magnifica gen. et sp. nov., is erected and the genera Punkochyzeria Kolesnikov, Turbanov & Vorontsov, 2025 and Cretachyzeria Liu, Fan & Ren, 2025 are transferred to this new family. Additionally, a new species, Punkochyzeria obtusa sp. nov., is described and P. khoyi Kolesnikov, Turbanov & Vorontsov, 2025 is proposed as a junior synonym of P. makolae Kolesnikov, Turbanov & Vorontsov, 2025. A revised diagnosis of Punkochyzeria is provided. Furthermore, phylogenetic analyses based on a limited set of morphological characters provide preliminary evidence for a sister-group relationship between Acarohystricidae fam. nov. and the extant family Calyptostomatidae Oudemans, 1923 within Erythraeina, justifying the establishment of Acarohystricoidea superfam. nov. We also include the ontogenetic and sexually dimorphic character states within the new family.

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