Contributions to the Taxonomy of Arlesminthurus Bretfeld and Calvatomina Yosii (Collembola, Symphypleona, Appendiciphora), with the Description of New Species from Northeastern Brazil

Abstract

<italic>Arlesminthurus</italic> Bretfeld is a small genus of Neotropical Bourletiellidae, with only four described species so far. <italic>Calvatomina</italic> Yosii is a widespread taxon of Dicyrtomidae, with most species known from the tropics. Here, we describe two new species from northeastern Brazil: <italic>Arlesminthurus caatinguensis</italic> sp. nov. and <italic>Calvatomina gladiata</italic> sp. nov. We also provide a detailed chaetotaxic study for <italic>Arlesminthurus</italic> for the first time, with updated diagnoses and identification keys for the Neotropical species of both genera and notes on their morphology. <italic>Arlesminthurus caatinguensis</italic> sp. nov. resembles <italic>A. aueti</italic> Arl&#xE9; in body color pattern, male head and dental chaetotaxy. The discovery of one bothriotrichum-like sens on the large abdomen of the new species needs to be investigated as a possible generic diagnostic feature, but we suggest that this structure is homologous to the S-sens seen in at least four Bourletiellinae genera, and they are likely related to each other. <italic>Calvatomina gladiata</italic> sp. nov. belongs to the <italic>rufescens</italic>-group and resembles <italic>C. rufescens</italic> Reuter and <italic>C. guyanensis</italic> Nayrolles and Betsch in some aspects of the head, dental and abdominal chaetotaxy. These descriptions represent the first record of <italic>Arlesminthurus</italic> from Caatinga and the first nominal species of <italic>Calvatomina</italic> from Brazil.