Centuriarus, Robillard, 2011

Robillard, Tony, 2011, Centuriarus n. gen., a new genus of Eneopterinae crickets from Papua (Insecta, Orthoptera, Grylloidea), Zoosystema 33 (1), pp. 49-60: 52-53

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http://doi.org/ 10.5252/z2011n1a2

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n. gen.

Genus Centuriarus   n. gen.

TYPE SPECIES. — Piestodactylus centurio Brunner von Wattenwyl, 1898   , here designated.

ETYMOLOGY. — Genus named after the type species.

DIAGNOSIS. — Among Eneopterinae   and Lebinthini   genera, Centuriarus   n. gen. is characterized by its large size and a mix of characters otherwise found in Cardiodactylus Saussure, 1878   , Lebinthus   and Agnotecous Saussure, 1878   . It is more slender in shape than Lebinthus   and Agnotecous   but resembles these genera by microptery in both sexes (FW short and hind wings absent), with similar inward curve of male CuA as in Lebinthus   . Despite microptery, male and female FW venations are more elaborate than in Lebinthus   and Agnotecous   , with a more differentiate mirror in males. Legs are long and fastigium is narrow as in Cardiodactylus   , but eyes are smaller than in Lebinthus   and Agnotecous   . Male genitalia are characterized by the absence of a median process, which is always present in Cardiodactylus   and in most Agnotecous   species (except a few species in yahoue species group), but is lacking in most Lebinthus   species; pseudepiphallic parameres are bilobate and oriented perpendicularly to genitalia main axis. Contrary to all other Lebinthini   species, the ovipositor in Centuriarus   n. gen. is not denticulate on apex dorsal edge.


Genus characterized by its large size even for the Lebinthini   tribe ( Fig. 1 View FIG ) and more slender shape than Lebinthus   and Agnotecous   . Eyes little prominent ( Fig. 2 View FIG ), smaller than in other Lebinthini   genera; fastigium as long as wide, slightly widened apically, not separated from vertex by a transverse depression nor furrowed longitudinally. Ocelli large, bulbous. Face higher than wide. Dorsal disk of pronotum slightly wider than long, its anterior margin indented, its posterior margin straight ( Fig. 1 View FIG ). Legs long. Fore tibiae with 2 tympana; inner tympanum covered by a sclerotised expansion ( Fig. 3A View FIG ), its membrane visible along a small longitudinal slit only; outer tympanum ellipsoidal, transversally plicate ( Fig. 3B View FIG ). Fore tibiae with 2 inner and 1 outer apical spurs. Tibiae II with 2 inner and 2 outer spurs.Hindfemora filiform at apex. Hindtibiae serrulated on their whole length, furrowed longitudinally on their dorsal side and with 4 pairs of subapical spurs and 3 pairs of apical spurs; inner spurs long and curved, outer spurs short and straight. Tarsomeres III-1 with 2 dorso-apical spines and a row of spines on outer dorsal edge; no lateral outer spine. FWs short, not reaching abdomen midlength; hindwings absent. Cerci long and thin, longer than hind femora.


Metanotal glands absent. Stridulum complete ( Fig. 4 View FIG ): harp wide; mirror not rounded but differentiated from other cells of D alignment; d2 cell undifferentiated; stridulatory file with teeth both on the transverse and longitudinal parts of 1A; bump near 1A basis carrying extra stridulatory teeth ( Fig. 5 View FIG ). CuP absent but claval fold visible along CuA. Diagonal faint, on top of a fold. CuA curved inward around the median fold, short and located on dorsum as in Lebinthus   and Agnotecous   . Apical field short but involving 3 cell alignments posterior to the mirror (alignments E-G). FW lateral field: R with several bifurcations in its posterior third; intermedian area dark brown. Subgenital plate clog-shaped, twice as long as sternite; inner side of subgenital plate with paired subapical swellings.

Male genitalia. ( Fig. 6 View FIG ) Pseudepiphallus triangular, basal margin straight, posterior apex with paired membranous lophi, setose, and without a median process as in most other Lebinthini   species. Rami straight, parallel and short. Ventral pseudepiphallic plate narrow and elongate.Pseudepiphallic parameres well sclerotised, with a dorsal lobe, a basal ventral lobe oriented anteriorly, and 2 distal ventral lobes parallel and perpendicular to the main genitalia axis. Ectophallic apodemes parallel and long. Ectophallic arc well sclerotised, straight. Ectophallic fold short, with a spatula-like sclerotisation. Lateral ectophallic expansions oriented anteriorly. Endophallic sclerite comprising a short median sclerotisation and 2 lateral arms, very long anteriorly, exceeding pseudepiphallic sclerite. Endophallic apodeme narrow, crest-like.


FWs ( Fig. 7A View FIG ) slightly overlapping, yellow brown, dorsal field with 7 strong longitudinal veins, 1A very strong and bifurcated at midlength; lateral field with 4 longitudinal veins, R without bifurcations. Ovipositor apex laterally flattened, lanceolate and smooth dorsally ( Fig. 7B View FIG ).

Female genitalia ( Fig. 7 View FIG C-E). Copulatory papilla more similar in general shape to that of Cardiodactylus   than to Lebinthus   or Agnotecous   ; ovoid, with a basal sclerotised ring and ventral reliefs.