Morphology of immature stages of Paraegidium costalimai (Coleoptera: Scarabaeidae: Orphninae) and remarks on egg-busters in Scarabaeidae first-instar larvae Author Sousa, Rafael Clayton de Jesus e Author Fuhrmann, Juares text Papéis Avulsos de Zoologia 2020 2020-03-04 60 13 1 16 http://dx.doi.org/10.11606/1807-0205/2020.60.special-issue.13 journal article 7615 10.11606/1807-0205/2020.60.special-issue.13 e659d28f-8399-4c1b-9830-d72ff6a5a024 1807-0205 4637571 Key to third instar of Orphninae known larvae 1 Epipharynx without plegmatia and corypha not prominent; lacinia with 1 or 2 unci (never with 3 tips); posterior area of ligula with thin setae; anal slit sinuate ( Aegidiini ) ................................................................2 – Epipharynx with plegmatia and corypha anteriorly prominent; lacinia with 3 unci (or 1 tridentate uncus); posterior area of ligula with stout setae, these setae are distinctly wider than anterior setae; anal slit Y-shaped ( Orphnini )...........................................................................3 2 Lacinia with 1 uncus; abdominal spiracles decreasing progressively in diameter posteriorly; metapretarsus with rounded and reduced apex ( Mexico )............................................. Aegidium cribratum Bates,1887 – Lacinia with 2 unci ( Figs. 31 -35); abdominal spiracles I-IV distinctly larger than V-VIII ( Figs. 45-52 ); metapretarsus with well-developed and acuminated apex ( Figs.38, 41 ) ( Brazil ) ......................................... .......................................... Paraegidium costalimai Vulcano et al., 1966 3 Surface of labrum without transverse carinae;stridulatory area of stipes with 14-15 acute teeth ......................................................................4 – Surface of labrum with two transverse carinae;stridulatory area of stipes with 20 acute teeth ( Hybalus ) ............................................................ 5 4 Surface of labrum not trilobate and with small tubercles irregularly distributed ( Italy )............... Chaetonyx robustus liguricus Mariani,1946 – Surface of labrum trilobate and without irregular distributed tubercles ( Madagascar )................................. Triodontus nitidulus (Guérin,1844) 5 Clypeus with two externoclypeal setae; apex of galea with 2-3 setae distinctly larger than outer setae;hypopharyngeal sclerome tridentate ( Italy )............................................................. H.benoiti Tournier,1864 – Clypeus with one externoclypeal seta;apex of galea with similar shaped setae;hypopharyngeal sclerome bidentate ( Morocco )......................... .................................................................... H. rotrouni Petrovitz,1964