Atenizus apicalis, Dalens & Touroult, 2014

Dalens, Pierre-Henri & Touroult, Julien, 2014, New taxa and new records of Oemini Lacordaire, 1868 and Ectenessini Martins, 1998 from French Guiana (Coleoptera, Cerambycidae, Cerambycinae), Insecta Mundi 2014 (359), pp. 1-12 : 4-6

Atenizus apicalis sp. nov.

( Figures 4–5 )

Type material. Holotype male, French Guiana, Rémire-Montjoly , Cabassou (n°358 IRD collection, light trap), XI.1978, Nicolas Degallier leg. ( MNHN) . Paratypes (33) - all material obtained with emergence chambers otherwise stated: French Guiana, Saint-Laurent-du-Maroni ( Crique Margot ), male, 10. II.2007, Pierre-Henri Dalens leg. ( PHDC); (Espérance, light trap) , male, IX.2008, Thibaut Rosant leg. ( TRC) ; Macouria , (Matiti ZA Wayabo), female, 20.XII.2007, Jean-Louis Giuglaris leg. ( JLGC) ; 2 males, 23.XII.2007, Jean-Louis Giuglaris leg. ( JLGC) ; 2 females, 9.I.2008, Jean-Louis Giuglaris leg. ( JLGC) ; 2 males, 3 females, 10.I.2008, Jean-Louis Giuglaris leg. ( JLGC) ; Montsinéry , (Galion, RD 06, pk 3), male, 08. II.2010, SEAG leg. ( PHDC) ; Roura (Montagne des Chevaux), female, 28. III.2008, SEAG leg. ( PHDC); ( FIT) , female, 31. V.2009, SEAG leg. ( PHDC); (Gemlight ®) , female, 11. II.2013, SEAG leg. ( PHDC) ; female, 6.IV.2013, SEAG leg. ( PHDC); (Gemlight ®) , female, 22-V-2013, SEAG leg. ( JTC); (Lumivie ®) , female, 10.VIII.2013, SEAG leg. ( PHDC); (Lumivie ®) , female, 16.XI.2013, SEAG leg. ( PHDC); (Lumivie ®) , female, 23.XI.2013, SEAG leg. ( PHDC); (Lumivie ®) , female, 14.XII.2013, SEAG leg. ( PHDC); (Lumivie ®) , couple, 28.XII.2013, SEAG leg. ( PHDC); (Lumivie ®) male, 15. II.2014, SEAG leg. ( PHDC) ; Matoury (Mont Grand Matoury, FIT), couple, 5.XI.2011, Stéphane Brûlé leg. ( PHDC) ; Rémire-Montjoly (Chemin Vidal, beating), female, 18.XI.1982, Gérard Tavakilian leg. ( IRD) ; male, 19-VII-2007, Pierre-Henri Dalens leg. ( PHDC); (Cabassou) , male, II.1979, Pierre Charles-Dominique leg. ( IRD) ; Régina (Bélizon forest trail), female, 20. VI.2007, Jean-Louis Giuglaris leg. ( JLGC) ; couple, 25. VI.2007, Jean-Louis Giuglaris leg. ( JLGC) ; Camopi (Légion Etrangère), male, 6.IX.2008, P.-H. Dalens leg. ( PHDC) .

Diagnosis. The species resembles Atenizus taunayi Melzer, 1920 in Martins’ key (1997) because of the color pattern. However, it differs by the much shorter body (ratio elytra/pronotum of 3.8 vs. 4.4-4.8 according to Martins for A. taunayi ) and by the relative length of antennomere III (ratio III/II near 3.0 for A. taunayi , 2.3 for A. apicalis sp. nov.).

Description, male ( Fig. 4 ). General aspect relatively robust, elytra 3.8 times longer than pronotum. Integument testaceous; head and prothorax castaneus; antennomeres II and III totally black, IV with apical 3/4 black, this black proportion decreasing toward antennomere XI; apical 1/6 of elytra black.

Head with sparse, coarse punctures; labial palpi shorter than maxillary; frons convex, longer than wide, glabrous except a fringe bordering lower ocular lobes; vertex with few sparse setae; coronal suture visible towards vertex, crossing median tubercle; lower ocular lobes large, upper lobes very reduced; antennae surpassing elytral apex by more than one segment, setiferous punctures on whole surface with semi-erect golden setae; scape with dorso-external scar, bilobate, each lobe with similar length; antennal formula reported to scape: I=1.0; II=0.3; III=0.9; IV=2.0; V=1.8; VI=1.7; VII=1.7; VIII=1.5; IX=1.5; X=1.4; XI=1.5. Presence of vestigial antennomere XII.

Anterior part of prothorax depressed and nearly glabrous. Prothorax 1.2 times longer than wide, laterally rounded. Pronotal disc flattened with only sparse setae; setae more abundant laterally. Absence of pro- and mesosternal process. Scutellum triangular. Mesothorax short; mesosternum bearing long golden setae. Metasternal suture visible on its posterior half. Elytra slightly expanding towards apex, 3.9 times longer than humeral width, with rounded apex; integument with dense punctures bearing semi-erect golden setae of medium length.

Ventrites with short golden setae; apex of last ventrite emarginate. Legs covered with rather long golden setae; femora flattened, profemora twice as wide as meso- and metafemora; tibiae cylindrical and straight; protibiae enlarged towards apex; protarsomeri I = II+III; mesotarsomeri I = 2 x (II+III), metatarsomeri I = 3 x (II+III).

Female ( Fig. 5 ). Sensibly larger and more robust; antennae shorter, reaching elytral apex at antennomere XI, antennomere XI shortened; thorax wider, more rounded laterally; elytra 3.7 times longer than humeral width; last ventrite truncate at apex.

Dimensions. In mm (male/female): total length, 3.8–5.9/5.2–6.8; width at humeri, 0.8–1.0/1.0–1.3

Etymology. Allusive to distinctive apical part of the elytra.

Remarks. The distribution of the records shows no particular pattern (Map 2). It is relatively well represented in the sublittoral forests of French Guiana. It has been collected all year round (Graph 1), but seems to be more abundant during the wet season and avoids the beginning of the dry season, with only one record in August, the month with the maximum abundance of longhorns in French Guiana ( Dalens and Touroult 2010).

Figures

Figures 1–7. Habitus of Oemini species from French Guiana. 1) Sphagoeme premarginata sp. nov., female holotype (IRD/MNHN). 2) Sphagoeme premarginata sp. nov., male, allotype (PHDC). 3) Sphagoeme paraensis Martins, 1977, female. 4) Atenizus apicalis sp. nov., male paratype. 5) Atenizus apicalis sp. nov., female paratype. 6) Atenizus simplex Bates, 1884, male. 7) Atenizus simplex Bates, 1884, female.