Geniates borelli Camerano, 1894 Third

Rodrigues, Sérgio Roberto, Gomes, Elias Soares, Morón, Miguel Angel & Fuhrmann, Juares, 2017, Descriptions of the Third Instar and Pupa of Geniates borelli Camerano and Anomala testaceipennis Blanchard (Coleoptera: Scarabaeidae: Rutelinae), The Coleopterists Bulletin 71 (2), pp. 375-388 : 376-380

Geniates borelli Camerano, 1894 Third instar

( Figs. 1, 2 , 5–17 )

Description. Dorsal length 43–48 mm ( Fig. 5 ). Head: Width 5.6–5.7 mm; hypognathous, light brown ( Fig. 6 ). Coronal suture distinct at posterior third. Frontal suture reaching antennae. Stemma present. A pair of dark spots present, adjacent to frontal suture. Each side with 7–10 dorsoepicranial setae adjacent to coronal suture, 8–10 ventroepicranial setae next to each stemma, 2 anteroepicranial setae between each stemma and epicranial dark spot, 3 posterofrontal setae, 1 latero-frontal seta at front angle of forehead, and 2 antero-frontal setae. Antennifer cylindrical. Antenna ( Figs. 8–9 ) with 4 antennomeres: I shorter than II and with 2 dorsal setae, II long and with 3 dorsal setae, III with a minor ventro-distal projection, IV with a dorsal spot and 2 ventral spots. Clypeus trapezoidal ( Fig. 6 ), each side with 1 anteroclypeal seta and 4 latero-clypeal setae. Labrum ( Fig. 6 ) as long as clypeus, each side with 2 laterolabral setae, 4 posterolabral setae, 1 mediolabral seta, and 2 anterolabral setae. Epipharynx as in Figs. 1, 2 , 7 . Corypha: epizygum indistinct; clithra absent. Haptomerum ( Fig. 1 ): zygum beak-like and with 3-toothed apex; heli absent; 3 denticle-like setae present on lateral marginal of zygum, 2 on the right and 1 on the left. Paria: right and left acroparia with 6–8 setae; right and left acanthoparia with 18 setae, acroparia-acanthoparia separation inconspicuous; gymnoparia distinct; welldeveloped chaetoparia with setae more robust anteromedially, 115 setae on the right side and 143 setae on the left side; plegmatia present, proplegmatia absent; laeotorma shorter than dexiotorma, epitorma narrow and depressed, pterotorma short. Pedium longer than wide. Haptolachus: crespis semicircular; nesium internum prominent; nesium externum acuminate and sharp; phoba absent; right lateral margin with 3–5 setae, left lateral margin with 12–16 setae. Right mandible ( Figs. 10–11 ): Incisor with a shallow groove distal to proximal tooth (S3). Dorsal face with 1 short and 1 long seta near S3 base; external face with 28 setae. Molar with 6 dorsal setae; brustia with 7 setae; ventral face with stridulatory area with 43 subparallel striae; ventral process well-defined; latero-proximal area with 7 setae. Left mandible ( Figs. 12–13 ): Incisor similar to that of right mandible, but with teeth more separated. External surface with 20 setae; dorsal face with 1 short and 1 long seta near S3 base. Molar with 8 dorsal setae; acia long and acute with apical setae; ventral face with stridulatory area with 42 subparallel striae; brustia with 15 setae; latero-proximal area with 7 setae; ventral process well-developed. Maxillae ( Figs. 14–15 ): Galea and lacinia separated by a suture; galea with simply pointed uncus; lacinia with 3 unci. Stipe with stridulatory area with row of 10‾12 acute denticles and truncated anterior process. Palpifer slightly shorter than palpomere I. Palp with 4 palpomeres: I with 4 setae, II with 1 seta, III with 2 setae, IV with small apical sensilla. Hypopharynx ( Fig. 16 ): Right posterior margin with 16 long, thin setae; left posterior margin without setae; asymmetrical hypopharyngeal sclerites with pronounced right process. Labium ( Fig. 16 ): Ligula with 16 short and thick setae and 10 short and thin setae; palp with 2 palpomeres: I longer and wider than II, II with apical sensilla. Thorax: Pronotum with 2 dorsal lobes. Thoracic spiracle 0.73 mm long, 0.55 mm wide; respiratory holes with irregular margin, 24 holes fit across longitudinal radius. Meso- and metanotum with 3 dorsal lobes. Anterior and medial legs slightly smaller than posterior legs. Tarsungulus with 1 distal seta and 1 medial seta. Abdomen: Spiracles I‾II 0.45 mm long and 0.45 mm wide, spiracles III–VI 0.50 mm long and 0.45 mm wide; spiracles VII‾VIII 0.64 mm long and 0.55 mm wide. Campus ( Fig. 17 ) with 4–5 thin, long setae. Barbula undifferentiated of dorsolateral setae. Raster ( Fig. 17 ): Each palidium consists of 5–8 small, wide pali; each tegilla consists of 15–20 setae, of which 0–2 are preseptulars; setae thick and straight in area near palidia and thin in external area. Anal lobe with 92–124 setae, anterior setae large and short, medial setae thin and long, posterior setae narrow and long.

Material Examined. BRAZIL: Mato Grosso do Sul, Aquidauana , laboratory rearing, 24.XI.2010, E. S. Gomes (collector), 8 larvae ( MZSP, file: 10294), 4 larvae ( UEMS) .

Remarks. Larva of G. borelli is distinguished from G. barbatus (in parentheses) by: head with 2 antero-frontal setae (0) and 2 long and 2 short lateroclypeal setae (2 long); raster with 6–7 pali (12–16).

Figures

Figs. 1–4. Epipharynx. Geniates borelli: 1) Haptomerum; 2) Lateral view (chaetoparia omitted, other setae represented by respective punctures). Anomala testaceipennis: 3) Haptomerum; 4) Lateral view (chaetoparia omitted, other setae represented by respective punctures). acp = acroparia; asa = anterior seta of acantoparia (with a plegma on its base); bzg = beak-like zygum; crp = crespis; czg = cross-bar zygum (with sensilla); ezg = epizigum (with four small distal teeth); hls = helus; ltm = laeotorma; nlc = narrow setae of left chaetoparia; nse = nesium externum; nsi = nesium internum; sap = setae of acroparia; slc = spine-like setae of left chaetoparia. Scale bars = 0.5 mm.

Fig. 5. Geniates borelli, third instar. Scale bar = 1 mm.

Figs. 6–13. Geniates borelli, third instar. 6) Head; 7) Epipharynx; 8–9) Antennomeres III–IV (dorsal and ventral views, respectively); 10–11) Right mandible (ventral and dorsal views, respectively); 12–13) Left mandible (dorsal and ventral views, respectively). Scale bars = 1 mm.

Figs. 14–17. Geniates borelli, third instar. 14–15) Maxillae, left and right, respectively, dorsal view; 16) Hypopharynx; 17) Raster. Scale bars = 1 mm.