Gabusibius, Hugel & Desutter-Grandcolas, 2021

Hugel, Sylvain & Desutter-Grandcolas, Laure, 2021, New intertidal crickets from Comoros and Mascarene islands (Orthoptera Trigonidiidae: Nemobiinae: Burcini), Zootaxa 4995 (1), pp. 1-26 : 10-11

publication ID	https://doi.org/ 10.11646/zootaxa.4995.1.1
publication LSID	lsid:zoobank.org:pub:35135437-CE87-4D3F-AEA4-9821A6AFDFCC
persistent identifier	https://treatment.plazi.org/id/03DE879D-2E65-FF93-FF70-FC08522F9A17
treatment provided by	Plazi
scientific name	Gabusibius
status	gen. nov.

Treatment

Genus Gabusibius View in CoL n. gen.

( Figs. 25–70 View FIGURES 25–32 View FIGURES 33–41 View FIGURES 42–48 View FIGURES 49–56 View FIGURES 57–61 View FIGURES 62–70 ; 73–77 View FIGURES 71–76 View FIGURE 77 )

Type species. Gabusibius mosi n. gen., n. sp, here designated.

Species included. G. ndzilu n. gen. n. sp.; G. mosi n. gen. n. sp.; G. dzindzanu n. gen. n. sp. . Speonemobius litoreus Vannini & Chelazzi, 1978 is tentatively placed in the genus Gabusibius n. gen. n. comb..

Distribution. South Western Indian Ocean, Comoros, possibly Somalia.

Diagnosis. Gabusibius n. gen. is s uperficially similar to Burcus Gorochov, 1986 , to Paraburcus Gorochov, 2018 , and to Malakapobius n. gen. It is characterized by the following characters. TIII with 2 sai ( Figs. 25, 29 View FIGURES 25–32 ; unlike Neoburcus Gorochov, 2018 which has 3 sai). Male winged ( Figs. 25 View FIGURES 25–32 , 33 View FIGURES 33–41 , 49 View FIGURES 49–56 , 57 View FIGURES 57–61 ; unlike Taiwanemobius Yang & Chang, 1996 ); with distinct stridulum ( Figs. 31 View FIGURES 25–32 , 40 View FIGURES 33–41 , 55 View FIGURES 49–56 , 60 View FIGURES 57–61 ; unlike Paranemobius Saussure, 1877 ); wings oval, truncated ( Fig. 25 View FIGURES 25–32 , 33 View FIGURES 33–41 , 49 View FIGURES 49–56 , 58 View FIGURES 57–61 ; unlike Burcus with relatively long FW); without mirror ( Figs. 31 View FIGURES 25–32 , 40 View FIGURES 33–41 , 55 View FIGURES 49–56 , 60 View FIGURES 57–61 ; unlike Speonemobius Chopard, 1924 with full mirror); with relatively long diagonal vein (unlike Paraburcus with short diagonal vein). Male SGP with only one apical lobe ( Figs. 30 View FIGURES 25–32 , 39 View FIGURES 33–41 , 54 View FIGURES 49–56 ; unlike Malakapobius n. gen. with trilobated SGP, Figs. 6 View FIGURES 1–8 , 15 View FIGURES 12–18 ), median lobe small, membranous. Male genitalia ( Figs. 62–70 View FIGURES 62–70 : pseudepiphallus dorsal magin not curved or weakly curved upwards (unlike Paraburcus with epiphallus curved downwards, and unlike Malakapobius n. gen, Burcus, Neoburcus , with pseudepiphallus curved upwards); distal part of pseudepiphallus broad in side view (unlike Malakapobius n. gen. with very narrow apex in side view); apex without rounded contiguous distal lobes (unlike Malakapobius n. gen.); without apical lateral extensions forming large apical concavity visible dorsally (unlike Burcus ). Epi-ectophallic invagination extending more anteriorly than rami insertion (unlike Malakapobius n. gen. with short epi-ectophallic invagination not exceeding rami insertion); rami very wide in side view (unlike all other genera except Malakapobius n. gen.).

Description. Including characters shared by other Burcini . Burcini of average size. General coloration typical for Burcini , from dark grey to light yellowish, with numerous black patterns. Head, pronotum and femora with long black bristles ( Figs. 25 View FIGURES 25–32 , 33 View FIGURES 33–41 , 49 View FIGURES 49–56 , 58 View FIGURES 57–61 ).

Head ( Figs. 25 View FIGURES 25–32 , 33 View FIGURES 33–41 , 49 View FIGURES 49–56 , 58 View FIGURES 57–61 ). Not wider than pronotum. Eyes moderately protruding, not flattened on head dorsum ( Fig 1–3 View FIGURES 1–8 ). Ocelli small; lateral ocelli rounded, well distinct; median ocellus less distinct, localized dorsally to fatigium tip; distance between lateral ocelli similar to distance between one lateral ocellus and median ocellus. Fastigium between antennae not wider that scapes; scapes wider than high (front view); palpi short, article length: 5>3>4; article 5 apex strongly widened.

Thorax ( Figs. 25–26 View FIGURES 25–32 , 33–34 View FIGURES 33–41 , 49–50 View FIGURES 49–56 , 57–58 View FIGURES 57–61 ). Pronotum wider than long, 0.61–0.72 times as long as wide; DD sides subparallel, DD slightly narrower anteriorly, slightly enlarged before mid-length; DD anterior margin strait or weakly rounded; DD posterior margin weakly rounded; DD longitudinal median furrow imprinted anteriorly; DD anterior transverse furrow distinct on the sides; LL shallow, higher anteriorly, less high posteriorly.

Legs ( Figs. 25, 29 View FIGURES 25–32 , 36, 38 View FIGURES 33–41 , 52, 53 View FIGURES 49–56 ). Legs of average size for Burcini , not elongated. TI with long oval outer tympanum; without inner tympanum. TI and TII with 2 ventral apical spurs of same length. FIII not particularly widened nor narrow: ca. 2.8–3.9 times as long as wide. TIII apical spurs typical of burcini : 3 ao, 2 ai; relative length of apical spurs: ao2>ao3>ao1, ai2>ai1. TIII with 3 outer and 2 inner subapical spurs; relative length of subapical spurs: sao1>sao2>sao3, sai1>sai2. Hind tarsi long, particularly hind basitarsi. Hind basitarsi without dorsal serration (as usual in Nemobiini, see Desutter-Grandcolas et al. submit.); with 3 apical spurs: 2 dorsal apical spurs, the inner very small; 1 inner ventral apical spur longer than the dorsal outer one.

Wings. FW ( Figs. 73–76 View FIGURES 71–76 ) present in males, absent in females. HW absent in both sexes.

Coloration. Head ( Figs. 25–27 View FIGURES 25–32 ; 33–35 View FIGURES 33–41 ; 49–51 View FIGURES 49–56 ; 57–59 View FIGURES 57–61 ). Antennae dark, unbanded. Face with more or less extended black patterns below the eyes converging to clypeus; semicircular area below antennae with black pattern more or less extended; face black patterns surrounding a light yellow area, more or less extended and pointing upwards; mandibles of variable color; scapus usually light yellow, antennae dark, not banded; palpi light yellow; genae light; tip of fastigium black dorsally; area dorsal to antennae with dark patch of variable extent; occiput of variable color, from light yellow to dark. Thorax ( Figs. 25–26 View FIGURES 25–32 , 33–34 View FIGURES 33–41 , 49–50 View FIGURES 49–56 , 57–58 View FIGURES 57–61 ). Pronotum DD from light yellow to grey, with black or dark lateral spots near anterior margin; with two small posterior black spots near midline; LL dark or black, anterior ventral margin sometimes lighter. Abdomen dark with light yellow spots. Legs ( Figs. 28–29 View FIGURES 25–32 ; 36–38 View FIGURES 33–41 ; 52–53 View FIGURES 49–56 ; 57 View FIGURES 57–61 ). Light yellow with dark bandings; FIII lateral field with dark basis, with 3 transverse dark bandings, the distal one on the knee; TIII dark.

Male. Wings. FW ( Figs. 31 View FIGURES 25–32 , 40 View FIGURES 33–41 , 55 View FIGURES 49–56 , 60 View FIGURES 57–61 ) oval in shape, truncated apically. Stridulatory apparatus well developed, with relatively long diagonal vein; with well distinct chords, not particularly long for Burcini ; without mirror: FW distal part with reticulation. Subgenital plate. Apex with only a median membranous lobe ( Figs. 30 View FIGURES 25–32 , 39 View FIGURES 33–41 , 54 View FIGURES 49–56 ). Genitalia ( Figs. 62–70 View FIGURES 62–70 ). Pseudepiphallus wide in dorsal view and side view, elongated, not particularly curved upwards (side view); apex without rounded contiguous distal lobes; without apical lateral extensions; without large apical concavity visible dorsally. Apodemes absent. Epi-ectophallic invagination extending more anteriorly than rami insertion. Rami very wide (side view), truncated anteriorly.

Female. No trace of wings ( Figs. 74, 76 View FIGURES 71–76 ). Subgenital plate ( Figs. 32 View FIGURES 25–32 , 41 View FIGURES 33–41 , 56 View FIGURES 49–56 , 61 View FIGURES 57–61 ) trapezoidal. Ovipositor weakly up curved; weakly enlarged apically ( Figs. 32 View FIGURES 25–32 , 41 View FIGURES 33–41 , 56 View FIGURES 49–56 , 61 View FIGURES 57–61 ). Genitalia. Copulatory papilla not examined.

Calling song. Only known from the type species G. mosi n. gen. n. sp. and from G.? litoreus (Vannini & Chelazzi) n. gen. n. comb. Male call is made of short verses of relatively constant amplitude and lasting less than 0.2 seconds ( Figs. 42–48 View FIGURES 42–48 ).

Remark on coloration. The only species observed on volcanic shingle beaches ( Gabusibius ndzilu n. gen. n. sp.) is very dark as is its habitat, whereas species living on coral shores are lighter. It is not clear whether color corresponds to an inherited trait and a stable character allowing to distinguish species, or whether color is flexible and directly depending on the environment where juveniles have grown. Nevertheless, Gabusibius mosi n. gen. n. sp. known from various localities and numerous specimens displays conspicuous variation in the extent of the black patterns indicating that color is quite a variable character.