Guimaraesiella Eichler 1949

Guimaraesiella Eichler, 1949

Nirmus Nitzsch, 1818: 291 (in partim).

Degeeriella Neumann, 1906: 60 (in partim).

Brueelia Kéler, 1936: 257 (in partim).

Guimaraesiella Eichler, 1949: 11.

Xobugirado Eichler 1949: 13.

Allobrueelia Eichler, 1951: 36 (in partim).

Allobrueelia Eichler, 1952: 74 (near-verbatim redescription).

Allonirmus Złotorzycka, 1964: 263.

Nitzschnirmus Mey & Barker, 2014: 101.

Callaenirmus Mey, 2017: 92.

Philemoniellus Mey, 2017: 145.

Type species: Docophorus subalbicans Piaget, 1885: 6 [= Docophorus papuanus Giebel, 1879: 475]. By original designation.

Remarks. The genus Guimaraesiella is divided into four subgenera: Gu. (Guimaraesiella) Eichler, 1949, Gu. (Mohoaticus) Mey, 2017, Gu. (Cicchinella) Gustafsson et al., 2019a, and Gu. (Dicrurobates) Gustafsson & Bush, 2020. However, many species are either too poorly described to be placed in either of these subgenera, or represent groups that are so different from these four subgenera that they may warrant the erection of further subgenera within Guimaraesiella.

Among the taxa described here, Guimaraesiella sphagmotica new species and Guimaraesiella nouankaoensis new species belong in the subgenus Gu. (Guimaraesiella), based on the following characters: female subgenital plate without cross-piece (Figs 89–90); gonopore terminal (Figs 96, 99); mesosomal lobes not protruding (Fig. 96, 99); distal thickening of mesosome interrupted medianly (Figs 95, 98); dorsal preantennal suture not transversally continuous median to ads (Figs 87–88). Gustafsson et al. (2019a) also included the absence of aps on the male abdominal segment IV as a character for Gu. (Guimaraesiella), but these setae are present in at least Guimaraesiella flavala (Najer & Sychra [in Najer et al.], 2012) and in Guimaraesiella menuraelyrae (Coinde, 1859), which also has three post-spiracular setae on tergopleurite IV in males; hence, absence of aps is not a good character for defining Gu. (Guimaraesiella).

Both Guimaraesiella sphagmotica and Gu. nouankaoensis are also part of the “core group” of Gu. (Guimaraesiella), as defined by Gustafsson et al. (2019b), based primarily on following characters: mesosome without distal rugose nodi or area and ventral sclerite with a single anterior extension (Figs 96, 99); dorsal preantennal suture not transversally continuous median to ads and dorsal anterior plate thus continuous with roof of head posteriorly (Figs 87–88). Most species in the “core group” have head shapes similar to the type species (see Gustafsson & Bush 2017; Gustafsson et al. 2019b), with the lateral margins of the preantennal head either clearly concave, or at most straight. The head shape of the two species of “core” Guimaraesiella described here differ from most other described species in this “core” group, suggesting that Gu. nouankaoensis and Gu. sphagmotica may be closely related.