Genus

Unihamus Luo & Wang in Luo et al. 2025. Type species: Periplaneta elegans Hanitsch, 1927, by original designation.

Generic diagnosis.

Body medium-sized. Sexual dimorphism weak: female broader than male; tegmina and wings of female shorter than male, but all surpassing tip of abdomen. Male. Antennae longer than body. Pronotum subelliptical, widest point posterior to midpoint. Posterior margin of metanotum mesally produced. Tegmina ScP slightly thickened. Front femur of type A 2. Pulvilli present; claws symmetrical and unspecialized; arolium medium-sized. Hind metatarsus longer than or equal to remaining tarsomeres combined; metatarsi with two rows of spinules ventrally; each side of pulvillus with one spinule. First abdominal tergite with visible, setose gland. Middle part of hind margin of supra-anal plate and subgenital plate concave inwards. L 3 unciform and not bifurcated. L 4 C with process near basal right margin. Distal part of R 1 G with two spines. R 2 large and complex. Anterior margin of R 3 triangular. Female. Outer margin of posterior lobes of valvifer II merged with laterosternite IX.

The simple antenna of Unihamus differ from that of Thyrsocera Burmeister, 1838, which has the antenna plumose or with plumose portions in males and moniliform in females.

This macropterous genus can be readily distinguished from the apterous and micropterous blattid genera (i. e. Afrostylopyga Anisyutkin, 2014, Apterisca Princis, 1963, Brinckella Princis, 1963, Henicotyle Rehn & Hebard, 1927, Macrostylopyga Anisyutkin et al., 2013, Miostylopyga Princis, 1966, and Neostylopyga Shelford, 1911). The weak sexual dimorphism (macroptery of males and females) in Unihamus differs from distinct sexual dimorphism in other genera:

Macropterous male and apterous female; i. e. Deropeltis Burmeister, 1838, Archiblatta Snellen van Vollenhoven, 1862, and Catara Walker, 1868);

Macropterous male and micropterous female; i. e. Blatta Linnaeus, 1758, Planiblatta Luo & Wang, 2023, Pseudoderopeltis Krauss, 1890);

Macropterous male and brachypterous female; i. e. Arcicaulis Luo & Wang, 2025, Bundoksia Lucañas, 2021, Cartoblatta Shelford, 1910, Tenumembrana Luo & Wang, 2025, some Periplaneta Burmeister, 1838, Protagonista Shelford, 1908, Scabinopsis Bey-Bienko, 1969, and Vittiblatta Luo & Wang, 2023).

The hind metatarsus of Unihamus is longer than or equal to the remaining tarsal segments combined, which differs from Atemeleta Brunner von Wattenwyl, 1893, Eumethana Princis, 1951, and Scabinopsis.

The first abdominal tergite has a visible, setose gland in Unihamus. Setose glands are absent in Blatta, Cartoblatta, Homalosilpha Stål, 1874, Periplaneta s. s., and Valaraukar Lucañas, 2025.

Species of Unihamus in which L 3 is not bifurcated can be distinguished from other genera with a bifurcated L 3. These genera are Archiblatta, Arcicaulis, Blatta, Bundoksia, Catara, Crescispina Luo & Wang, 2025, Deropeltis, Dorylaea Stål, 1877, Eroblatta Shelford, 1910, Hobbitoblatta Lucañas, 2023, Homalosilpha, Nazgultaure Lucañas, 2023, Tenumembrana, Valaraukar, Validiblatta Luo & Wang, 2025, and Vittiblatta.

Key to males of known species of Unihamus