Stenobrimus Redtenbacher, 1906

Stenobrimus Redtenbacher, 1906 View in CoL

Differentiation. – This genus is well recognized among Obriminae by a number of characters, why Hennemann et al. (2016: 17) placed it in a generic group on its own, the Stenobrimus -group. It can be differentiated from all other genera of Obriminae by the very slender body and legs, distinctive body armature, which includes simple paired posterior mesonotal and metanotal spines, lack of any composite spines or armature and presence of a distinct spine at the posterolateral angle of abdominal terga II-VI, very long and filiform antennae, which have the median antennomeres in particular extremely elongated, wholly unarmed tibiae, as well as the short ovipositor of ♀ in which the epiproct is shorter than the anal segment and the apex of the subgenital plate multi-dentate ( Fig. 45G). The slender body,body supination,morphology of the antennae and multi-dentate apex of the subgenital plate are unique within the Obriminae . Moreover,the eggmorphologyreadilycharacterizes Stenobrimus . The eggs have the capsule fairly short with the polar-area conically evaginated, posterolateral expansions of the micropylar very long and surrounding most of the capsule surface and the operculum inserted in the capsule at an angle of almost 45°. While a conically evaginated polar-area is also seenin the eggsof Sungaya . and the genus Obrimus Stål, 1875 , the displaced operculum is unique within the entire subfamily Obriminae . The conically elevated back of the vertex and lack of invaginations on the metasternum is only shared with Aretaon Redtenbacher,1906 , Trachyaretaon Rehn & Rehn,1939 and Sungaya Zompro, 1996 , which suggests close relation to these three genera (Hennemann et al., 2016: 17).

Remarks. – Notes on the distribution and a key to the species of Stenobrimus were presented by Lit (2010), who first recorded the genus from the island of Mindanao and hypothesized that what may appear to be a disjunct distribution pattern rather reflects the still limited material available rather than events that could be associated with discontinuous distributions and relictual species.An updated key was provided by Eusebio, Lit & Lucañas (2023). The numerous – A. Habitus dorsal view (N-Luzon, Ifuago Province, Mayoyao) [FH 1347-7]. – B. Habitus dorsolateral view (N-Luzon, Ifuago Province, Mayoyao) [FH 1347-7]. – C. Terminalia in dorsal view (N-Luzon, Mountain Province, Bay Yo) [FH 1347-1]. – D. Terminalia in ventral view (N-Luzon, Mountain Province, Bay Yo) [FH 1347-1]. – E. Mesosternum (N-Luzon, Ifuago Province, Mayoyao) [FH 1347-7].

citations of Stenobrimus may be referred to in the Phasmida Species File (http:// Phasmida .SpeciesFile.org).

Distribution. – Philippines, endemic. So far recorded only from the islands of Luzon, Catanduanes, Mindanao and Polillo.

Species included

1. Stenobrimus bolivari Redtenbacher, 1906: 37 , pl. 1: 1.

Distribution: Luzon & Catanduanes.

2. Stenobrimus lumad Lit & Eusebio, 2010: 4 , figs.

Distribution: Mindanao.

3. Stenobrimus pilipinus Eusebio, Lit & Lucañas, 2023: 785 , figs. 1, 5.

Distribution: Mindanao.

4. Obrimus tagalog Rehn & Rehn, 1939: 418 , fig. 5, pl. 31: 11, 38:46.

Distribution: Polillo.