DOI: 10.3897/asp.83.e171454

Authors: Josemária Silva de França, Bruno Cavalcante Bellini, Nerivânia Nunes Godeiro, Nikolas Gioia Cipola

Abstract: Rhynchocyrtus Mendonça and Fernandes, 2007 is a monotypic genus of Entomobryidae, endemic to Brazil. Its placement within the Lepidocyrtinae and its systematic affinities with other members of the subfamily, especially with the subgenera of Lepidocyrtus Bourlet, 1839, have never been tested before. Here, we described the morphology and mitogenome of a new species of Rhynchocyrtus from the northeastern Brazilian Atlantic Forest (Rhynchocyrtus cleideae sp. nov. holotype female deposited in CC/UFRN: Brazil, Rio Grande do Norte State, Natal municipality), depicting for the first time the dorsal trunk chaetal pattern, homology and body pseudopores distribution for the genus. The new species description provided further data which we used to update the genus diagnosis, following the current standards used for other Entomobryidae. We also evaluated the phylogenetic placement of the genus within Lepidocyrtinae, testing its affinities with different subgenera of Lepidocyrtus. Our results point to Rhynchocyrtus as an ingroup of Neotropical Setogaster Salmon, 1951 subgenus, and not related to Cinctocyrtus Yoshii and Suhardjono, 1989 as previously suspected. Setogaster is likely a paraphyletic taxon, suggesting that some features currently used to separate Lepidocyrtus subgenera do not hold phylogenetic signal, and should be reevaluated. We discuss the problematic systematics of Lepidocyrtinae and reinforce the usefulness of some alternative morphological traits to better define its subgroups, based on the current knowledge of the group.

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DOI: 10.3897/asp.82.e114038

Authors: Adrian Smolis, Nataliya Kuznetsova, Grzegorz Paśnik

Abstract: With 54 described species, Endonura is one of the most species-rich genera of the Neanurinae. The taxon is characterised by the presence of 0–2 ocelli, separate tubercles Di and De with the non-crossed type of chaetotaxy on the head, and two or three tubercles on the fifth abdominal tergite. Four new species from the Crimea and the Caucasian region have been described based on adult specimens: Endonura armeniaca sp. nov., E. cochlearifera sp. nov., E. crimica sp. nov., and E. duplex sp. nov. A phylogenetic analysis of the genus Endonura using 70 characters of adult external morphology is presented. Two methods were chosen to examine different approaches to the reconstruction of evolutionary relationships: Maximum Parsimony (MP) and Bayesian Inference (BI). Besides supporting Endonura monophyly both analyses failed to resolve any of the deeper relationships within the genus. All known species within the genus are grouped into two main clades, A and D. Both of these clades have members distributed throughout Europe, the Caucasus and the western part of Central Asia. Endonura crimica sp. nov. can be considered as an intermediate between these two clades.

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DOI: 10.3897/asp.81.e104522

Authors: Clément Schneider, Cyrille A. D’Haese

Abstract: Mackenziella psocoides Hammer, 1953 (Collembola: Mackenziellidae) is a widespread but uncommon springtail. Its unusual body shape (ovoid, with partial coalescence of abdominal segments) has puzzled the specialists for a long time, until the discovery of males allowed to relate the species to a family of globular springtails, the Sminthurididae. Yet, the precise phylogenetic position of M. psocoides, and hence of the Mackenziellidae, remained ambiguous. In this work, we report a new locality for M. psocoides in Germany. We provide the first DNA sequences (nuclear ribosomal DNA operon) for the species, as well as the first images using scanning electron microscopy. We investigate its phylogenetic position based on the molecular data and specify details on its morphology. Our results show that M. psocoides is nested inside of Sminthurididae, as the sister group of Sphaeridia Linnaniemi, 1912. Consequently, Mackenziellidae syn. nov. is here synonymized with Sminthurididae. We include Mackenziella and Sphaeridia in the Sphaeridiainae subfam. nov., a replacement name for Sphaeridiinae Richard, 1968 that is a junior homonym of Sphaeridiinae Latreille, 1802 (Coleoptera: Hydrophilidae). Corresponding to its phylogenetic position within Sminthurididae, the evolutionary origin of M. psocoides is younger than previously thought (79 mya +/- 35 my). The lineage accumulated an unusual amount of body modifications involving, among others, the loss of the globular body shape. This rapid rate of evolution is, to our knowledge, unique in springtails. It shows that globular body shape is not an evolutionary dead-end, and the secondary acquisition of a linear body shape and recovery of longitudinal flexibility is still possible.

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