Microcoryphia

Song, Zhi-Shun, Mendes, Luis F. & Huang, Fu-Sheng, 2012, A Review Of Microcoryphia Fauna From Vietnam, With New Subgenus, New Species Of Machilontus Silvestri (Machiloidea: Meinertellidae), And New Data For Sexual Dimorphism In The Order, Raffles Bulletin of Zoology 60 (2), pp. 313-327 : 314

Key to the genera and subgenera of Microcoryphia from Vietnam

1. Abdominal sternites II–VII well developed; article II of maxillary palps in males without a dorsal distal hook-like process; penis longer than half of length of coxites IX; parameres present at least on abdominal segment IX ...................... 2 ( Machilidae )

– Abdominal sternites II–VII small; article II of maxillary palps in males usually with a dorsal distal hook-like process; penis usually no longer than half of length of coxites IX; parameres absent ......................................................... 3 ( Meinertellidae )

2. Flagellum of antennae without scales, but present on scapus and pedicel; lateral ocelli shoe-shaped, subinferior to eyes, more or less close each other; mandible with four distinct teeth in incisor portion; parameres annulated, restricted to abdominal segment IX; male genitalia covered by coxites IX; ovipositor tertiary type; two pairs of eversible vesicles on abdominal segments II–VI ........................................... Pedetontus (s. str.) Silvestri

– ... External morphology mostly similar to Pedetontus (s. str.), but two pairs of eversible vesicles on abdominal segments II–V ................................................. Pedetontus (Verhoeffilis) Paclt

3. Coxal stylet absent on legs; tarsi with three articles; thorax somewhat humpbacked, especially mesothorax very developed ............................................... Machilellus Silvestri

– Coxal stylet present on hind legs; tarsi with two articles; thorax normal .................................................................................... 4

4. Eyes longer than wide, with ratio of length to width over 1.2; dorsal process of article II of male maxillary palps with a well separated cylindrical base ........................................................ ................................... Machilontus (Megalopsobius) Silvestri

– Eyes wider than long; dorsal process of article II of male maxillary palps without a cylindrical base ........................... 5

5. Sexual dimorphism of non-genital portions relatively scarce; male frons slightly convex, antennal scapus typical and smooth; article III of maxillary palps normal, nearly as long as article II; article II of labial palps normal, without process on apex ................................................... Machilontus (s. str.) Silvestri