Chaerilobuthus Lourenco and Beigel 2011
Creators: name: Xuan, Qiang
name: Prendini, Lorenzo
name: Engel, Michael S.
name: Cai, Chenyang
name: Huang, Diying
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Scorpiones
Chaerilobuthidae
Chaerilobuthus

description: Genus Chaerilobuthus Lourenço and Beigel, 2011
(Figs 4–39)
Chaerilobuthus Lourenço and Beigel, 2011: 635–639, figs 1–11. Type species: Chaerilobuthus complexus Lourenço and Beigel, 2011: 635–639, figs 1–11.
Chaeriloiurus Lourenço, 2020: 34–50, figs 13–22, synon. nov. Type species: Chaeriloiurus brigittemuellerae Lourenço, 2020: 34–50, figs 13–22 [= Chaerilobuthus brigittemuellerae (Lourenço and Velten, 2020), comb. nov.].
Serratochaerilobuthus Lourenço, 2024: 1–6. figs 1–12, synon. nov. Type species: Serratochaerilobuthus schmidti Lourenço, 2024: 1–6. figs 1–12 [= Chaerilobuthus schmidti (Lourenço and Velten, 2024), comb. nov.].
Diagnosis: The species of Chaerilobuthus share many characters with the extant family Pseudochactidae, notably: sternum pentagonal (Figs 12B, 15B, 20E, 23B, 26B, 28B, 33B, 34D, 37F); cheliceral moveable finger basal teeth absent; moveable finger ventral surface with serrula (Figs 6C, 12G, 18F, 23C, 29B, 34B, 37B); median denticle rows of pedipalp chela fingers comprising oblique subrows (Figs 13C, 15E, 29F, 33C); pedipalps with Type D trichobothrial pattern, β configuration; trichobothrium d 2 situated on femur dorsal surface, angle formed by d 1, d 3, and d 4 opening toward prolateral surface (Figs 7, 10, 13, 16, 21, 24, 26, 31, 35, 38); legs with prolateral and retrolateral pedal spurs present, legs III and IV with tibial spurs absent (Figs 6I–L, 7F–I, 12K, L, 15G, 18C, 20J, K, 23J, K, 29G–J, 33C, D, G, H, K, 34I–L, 37D), and telotarsi each with two rows of ventrosubmedian spinules (Figs 6J–L, 9G, I, 23J, K, 29H, J); metasomal segment V with paired ventrosubmedian carinae (Figs 5F, 9N, 20L, 33I, J, 35I); telson without subaculear tubercle (Figs 5F, 9N, 14B, 18G, 19B, 33I, J, 37I).
The extinct genus may be distinguished from other pseudochactid scorpions by the following combination of characters: carapace anterior margin sublinear, anterolateral margins entire, posterolateral margins angular, slanting, posteromedian margin slightly recurved (Figs 6A, 9A, 12A, 15A, 20B, 23A, 26A, 28A, 34A, 37A); carapace circumocular sutures absent (Figs 6A, 9A, 12A, 15A, 20B, 23A, 26A, 28A, 34A, 37A); median ocelli absent and one pair of large posterolateral major lateral ocelli present (Figs 6A, 9A, 12A, 15A, 18D, 20A, B, 23A, 26A, 28A, 29A, 33A, 34A, C, 37A, C); pedipalp femoral trichobothria d 3 and d 4 situated closer to midpoint of segment (Figs 7A, 10, 13A, 16, 24A, 26D, 31, 35C, J) and d 3 – d 4 axis directed slightly away from retrodorsal carina rather than parallel to it (β configuration) (Figs 7A, 10, 13A, 16, 24A, 26D, 31, 35C, J); pectines with low tooth counts (five to eight teeth) (Figs 6D, 12B, 15D, 18I, 20G, 23F, 26B, 29C, 33B, 34G, 37H).
Additionally, two new characters, considered diagnostic for Chaerilobuthus, are shared with the extant pseudochactid, Qianxie solegladi (Tang, 2022: 7, 11, figs 10 43–46): leg I maxillary lobes (coxapophyses) anterior margins with serrula (Fig. 38); leg basitarsi with pair of spinule rows distally (Figs 6I–L, 9F–I, 12H, L, 15G, 18C, 20J, K, 23K, 29G–J, 33G, H, 34I–L).
Included species: Chaerilobuthus birmanicus Lourenço, 2015; Chaerilobuthus brandti Lourenço, 2022; Chaerilobuthus brigittemuellerae (Lourenço and Velten, 2020), comb. nov.; Chaerilobuthus bruckschi Lourenço, 2015; Chaerilobuthus complexus Lourenço and Beigel, 2011; Chaerilobuthus enigmaticus Lourenço, 2015; Chaerilobuthus gigantosternum Lourenço, 2016; Chaerilobuthus hansgeorgmuelleri Lourenço, 2019; Chaerilobuthus knodelorum Lourenço, 2018; Chaerilobuthus longiaculeus Lourenço, 2013; Chaerilobuthus meggeri Lourenço, 2021; Chaerilobuthus petersi Lourenço, 2024; Chaerilobuthus schmidti (Lourenço and Velten, 2024), comb. nov.; Chaerilobuthus schwarzi Lourenço, 2015; Chaerilobuthus serratus Lourenço, 2016; Chaerilobuthus staxi Lourenço, 2024.
Remarks: Results of morphological phylogenetic analysis justify the transfer of Chaerilobuthidae to Pseudochactidae, as Chaerilobuthinae, stat. nov.; the following new synonyms: Chaeriloiurus Lourenço, 2020 = Chaerilobuthus Lourenço, 2016, synon. nov., and Serratochaerilobuthus Lourenço, 2024 = Chaerilobuthus Lourenço, 2016, synon. nov.; and the following new combinations: Chaerilobuthus brigittemuellerae (Lourenço and Velten, 2020), comb. nov. and Chaerilobuthus schmidti (Lourenço and Velten, 2024), comb. nov ..
description: Published as part of Xuan, Qiang, Prendini, Lorenzo, Engel, Michael S., Cai, Chenyang & Huang, Diying, 2025, Extinct scorpion family Chaerilobuthidae from Mid-Cretaceous Burmese amber reinterpreted as subfamily of extant family Pseudochactidae (Chelicerata: Scorpiones), pp. 1-60 in Zoological Journal of the Linnean Society 203 (1) on pages 3-5, DOI: 10.1093/zoolinnean/zlae169, http://zenodo.org/record/14831464