Amborotragus, Clarke, 2013
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publication ID |
https://doi.org/ 10.1590/S0031-10492013002800001 |
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persistent identifier |
https://treatment.plazi.org/id/03B5879C-7816-D633-E171-F9AEFB89FC56 |
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treatment provided by |
Felipe |
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scientific name |
Amborotragus |
| status |
gen. nov. |
Amborotragus View in CoL gen. nov.
Fig. 6A, 6B View FIGURES 4‑6 , 11C View FIGURES 7‑12
Type species: Amborotragus vestigiepimeron sp. nov., here designated.
Diagnosis: Sexually dimorphic (including surface of pronotum), and dichromatic. Forebody distinctly shorter than abdomen. Maxillary galea very long and narrow. Antennae subfiliform. Pronotum bisulcate in male. Mesosternal process little differentiated (golf tee-shaped). Mesepimeron almost vestigial. Elytra subulate, rather short and dehiscent, and densely punctured (and lacking vitreous panels). Front and middle legs subequal, hind leg almost twice length of middle leg; metatarsomere I slightly longer than II + III, about 1.5 longer in female.
Amborotragus is similar to some species presently in the genus Odontocera , but cannot be included in this genus for lack of vitreous panels; and as far as is known, the golf tee-shaped mesosternal process, only occurs in one species of this genus, Odontocera scabricollis Melzer, 1934 , which may not belong in Odontocera (mesosternal process lobed), nor qualifies (elytra vitreous, genitalia different) for inclusion in Amborotragus .
Amborotragus is also, somewhat, similar to some species of Eclipta Bates, 1873 , but the type-species, Eclipta flavicollis (Bates, 1873) , differs from Amborotragus in many ways, the most demonstrative being the pronotum (subglobose, and densely micropunctate), elytra (rather wide, and subcuneate), and metatarsus I very long (longer than II-V united).
The establishment of Amborotragus gen. nov. would seem to be justified, if not for its very narrow mesoepimeron (which has not been examined in many species of Rhinotragini ), for the reasons outlined above.
Description of genus: Sexually dimorphic and dichromatic; small (7.20-10.30 mm); body subcylindrical, narrow in male, slightly broader in female; forebody shorter than abdomen in male (equally long in female); elytra moderately short, flat and dehiscent, apex truncate (subtruncate in female); antennae moderately short (shorter in female), legs long.
Head with eyes narrower than pronotum; Rostrum moderately short in males (width/length 2.8), longer in females; frontal suture distinct in both sexes. Mentum-submentum separated from neck by transverse declivity. Mandibles acute at apex (blunter in female). Palps short, apical palpomere subcylindrical, truncate at apex (sides and apex more rounded in female). Eyes finely faceted; large in male, smaller in female; inferior lobes not obliquely placed in either sex (distal margin lying on frons, proximal margin transverse); almost contiguous in male; well separated in females. Antennal tubercles weak and rounded at apex, the distance between them twice width of scape.
Antennae subfiliform, not long (not passing apex of elytra); not serrate in male (apical segments weakly serrate in female); pedicel and antennomeres III-V finely setose (but scape lacking setae); in both sexes filiform basally, somewhat crassate apically (including antennomere XI). Antennal formula sexually dimorphic (in female antennomeres V-X incrementally shorter); in male: scape subcylindrical, distinctly shorter than antennomere III; III the longest; IV, VI and VII equal, shorter than V, slightly longer than XI; V the second longest, only slightly shorter than III; VIII and XI equal, slightly longer than IX and X; XI ending with short acuminate cone. Prothorax sexually dimorphic; subcylindral in male (as in female, but thick pubescence at sides gives it a vase-shaped appearance); elongate; sides widest and slightly protuberant at middle, straight to front margin, slightly sinuate to hind margin. Pronotum convex, surface uneven for basal two-thirds: in male with single, broad, prominent callus to either side of midline, each callus separated from midline by distinct, longitudinal sulcus; midline wide (but not as wide, nor as prominent as paired calli), and restricted to basal half; in female callus at midline absent, and paired pronotal calli rounded and shorter (limited to basal half of pronotum). Prosternum transversely, broadly and feebly depressed (abruptly declivous with front margin), posteriorly subplanar with its process; the latter weakly arced to apex, with sides slightly raised; base moderately long and narrow (about 0.1 mm), widening to large apical triangle (the middle of latter depressed in male, strongly depressed in female). Coxal cavities closed at sides and just closed behind. Mesosternal declivity deep, but not abrupt (in female abrupt and deep). Mesosternal process golf-tee shaped, moderately narrow (about 0.13 mm), about one quarter width of coxal cavity (in female wider (0.2 mm), about one third width of coxal cavity), apical margin slightly excavate, leaving apical angles acute; coxal cavity widely open to mesepimeron; the latter characteristic, very narrow (about 0.05 mm at its widest), almost vestigial. Scutellum partially hidden by pubescence, but appears to be very small in size, narrow and trapezoidal. Elytra in male narrow across humeri (just exposing sides of mesosternum and metepisternum), in female slightly wider (hiding sides of mesosterna); reaching base of urosternite III; moderately convex for basal sixth, otherwise flattened; humeri somewhat prominent and rounded, not projecting; humero-apical costa traceable from behind humeri, well marked towards pre-apex (in female restricted to apical half); sides of elytra strongly arced (moderately strongly converging to apical third and equally strongly diverging to apex); suture dehiscent from basal third, strongly for apical third; apical third of each elytron slightly widening to pre apex, apex truncate. Metasternum tumid, mesocoxae lying well below level of metasternum; sides moderately rounded, apical margin oblique; metasternal suture almost entire, from slightly behind base of metasternal process to hind edge of metasternum, and deep posteriorly. Metepisternum moderately large and broad (especially broad in female), subrectangular, moderately acuminate to apex. Abdomen in male convex, narrow, and cylindrical; broadest at base of urosternite I and apex of IV (but II, III and V only slightly narrower); urosternites II and III equal in length, moderately elongate, longer than IV (quadrate) and V (transverse); sides of individual urosternites straight; surface of V almost wholly occupied by large, round, tumid area based on centre (the sides rounded and slightly raised, the centre flat); apical margin truncate. Female abdomen fusiform; widest at urosternites I and base of II; III very slightly narrower; only I and V slightly elongate, II-IV almost quadrate; V flat, apical margin subacuminate. Abdominal process planar to abdomen; rather short (0.25 mm), broad and triangular; apex weakly acuminate, not deeply inserted between metacoxae (especially in female). Apical tergite in male convex and cylindrical, slightly constrict- ed before apex, and apical margin weakly rounded; in female rather flat, conical, not constricted before apex; and apical margin weakly subacuminate. Legs similar in both sexes (slightly shorter in female); moderately slender and long; ratio of length from front to hind leg 1.0:1.2-1.3:2.3-2.4. Length of body/length of hind leg 1.1. Pedunculate-clavate; claves fusiform (when viewed from above) and subacuminate at apex; pro- and mesofemoral claves wide (when viewed from the side) and strongly flattened laterally; metafemoral clave subcylindrical. Meso- and metafemoral peduncles narrow and flattened; those of metafemora about as long as claves. Tibiae slightly shorter than femora and bisinuate. Protibia narrow for basal third, abruptly widening, and subparallel to apex; apex truncate, toothed, and excised laterally. Metatibia shorter than metafemora; cylindrical; gradually widening to apex; and rather sparsely setose. Tarsi moderately robust; only metatarsomere I distinctly elongate, II and III as wide as, or wider than apex of tibiae (with II trapezoidal, and III quadrate and deeply lobed, the lobes hardly divergent); metatarsal setae rather short and sparse; metatarsomere I subcylindrical, distinctly longer than II + III.
Male genitalia (11C): Tegmen similar to some species of Odontocera , weakly sclerotised, moderately small. Lateral lobes divergent; long (0.80 mm), slightly widening from middle towards apex, the latter subacuminate and finely setose (sides glabrous). Basal piece moderately long, V-shaped. Median lobe moderately sclerotised; arced; in lateral aspect narrow and acuminate; in dorsal aspect moderately broad, narrowing towards apex, apex with small acuminate tip.
Surface ornamentation: Body (except abdomen) almost entirely pubescent and closely punctured (the punctures simple or alveolate). Above: densely punctured; alveolate on head and pronotum, non-alveolate and beveled on base of elytra; dense recumbent pubescence on frons; and in female pronotal disc surround- ed by broad, scalloped ring of recumbent, yellow pubescence. Below: meso- and metasterna micropunctate with scattered, larger punctures, and dense recumbent pubescence; dense (less so in female), long, erect pubescence on mentum-submentum and prosternum, suberect on metasterna. Abdomen sparsely punctured and pubescent, with dense arc of recumbent pubescence laterally in female.
Etymology: Combination of Amboro (Amboró National Park, where the species comes from, and tragus from (Rhino)tragini; gender masculine.
| VI |
Mykotektet, National Veterinary Institute |
| V |
Royal British Columbia Museum - Herbarium |
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