TL;DR: A new acanthopid lineage based on male and female specimens from the Brazilian Amazon is described and some aspects of sexual dimorphism in Metacanthops fuscum are highlighted in relation to their dimorphic cryptic strategies, where males resemble a dry leaf and females a lichenous twig.
Abstract: Praying mantises (Mantodea) are distinct for their rich diversity of cryptic adaptations. Among the many strategies, dry-leaf mimicry have evolved multiple times in unrelated lineages from different zoogeographic regions, among them the Neotropical Acanthopidae. Here we describe Metacanthops fuscum n. gen. et n. sp. based on male and female specimens from the Brazilian Amazon. The recognition of this new acanthopid lineage revealed that Acanthops amazonica Beier, 1930 (currently assigned to Metilia Stal) is a member of Metacanthops and thus we transfer this species, now referable to as Metacanthops amazonica (Beier, 1930) n. comb., redescribe the holotype, and provide new data on its distribution in Brazil and French Guiana. Metacanthops is closely related to Metilia, from which its number of forefemoral posteroventral spines, head and compound eye shape, pronotal configuration, wings features, and the entirely brown habitus of males, can distinguish it. We highlight some aspects of sexual dimorphism in Metacanthops fuscum in relation to their dimorphic cryptic strategies, where males resemble a dry leaf and females a lichenous twig. We additionally establish five recently published names under genus Metilia as nomina nuda.
TL;DR: A cladistic analysis revealed the monophyly of the genus with two major clades, one containing falcataria + parafalcata + royi + centralis and the other containing the remaining species.
Abstract: The species of the genus Acanthops Serville 1831 are revised. Seventeen valid species are recognized, and A. royi sp.n., A. centralis sp.n., A. occidentalis sp.n., A. onorei sp.n., A. elegans sp.n., and A. parafalcata sp.n. are described. The species A. contorta Gerstaecker, A. fuscifolia Olivier and A. erosa Serville previously treated as synonyms of A. falcataria (Goeze) are returned to species status; A. sinuata is treated as synonym for A. fuscifolia; A. amazonica is included in the genus Metilia. Keys to males and females are provided. A cladistic analysis, using 19 morphology characters, revealed the monophyly of the genus with two major clades, one containing falcata + parafalcata + royi + centralis and the other containing the remaining species. Finally, a biogeographic analysis is made.
TL;DR: The long-neglected Chilean harvestman species Pachylus crassus (Roewer, 1943) (Gonyleptidae, pachylinae) is redescribed and illustrated from the types and additional material as mentioned in this paper.
Abstract: The long-neglected Chilean harvestman species Pachylus crassus (Roewer, 1943) (Gonyleptidae, Pachylinae) is redescribed and illustrated from the types and additional material. A lectotype is designated from the original syntype series. Until now P. crassus was only known from its brief original description. Moreover, its generic affiliation remained obscure for decades, as it was successively placed in different genera until it was determined to be a member of Pachylus C.L. Koch, 1839. Aside some taxonomic remarks on the genus, it is here proposed to exclude from Pachylus one doubtful nominal species, Pachylus acanthops (Gervais, 1849), and to consider it a species inquirenda. A thorough comparison of P. crassus with its presumed close relative, P. quinamavidensis Munoz, 1969, is provided. New records for both species and a map with all known localities of the genus are also given.
TL;DR: A new species of Miracanthops Roy, 2004 from Tambopata, Peru is described and based on the characters of the male, Acanthops occidentalis Lombardo & Ippollito 2004 is transferred to Miracantops as M. Occidentalis n.
Abstract: A new species of Miracanthops Roy, 2004 from Tambopata, Peru is described: Miracanthops eseejja n. sp. The diagnosis of the genus Miracanthops is also completed, with the description of the male, which was previously unknown. Based on the characters of the male, Acanthops occidentalis Lombardo & Ippollito 2004 is transferred to Miracanthops as M. occidentalis (Lombardo & Ippollito 2004) n. comb.