Platycoelia gaujoni Ohaus, 1904

Paucar-Cabrera, Aura & Smith, Andrew B. T., 2002, Larval Descriptions For The Neotropical Genus Platycoelia (Coleoptera: Scarabaeidae: Rutelinae: Anoplognathini), The Coleopterists Bulletin 56 (3), pp. 438-445 : 440-442

Platycoelia gaujoni Ohaus , third-instar larva

Figs. 1–9

The larval description of Platycoelia gaujoni is based on 1 third-instar larva. This specimen is associated with two second-instar larvae with the following collecting data: Ecuador, Loja, Villonaco , 3,000 m, 5 September 1905, F. Ohaus. Ohaus (1908, 1909) discussed these specimens and also collected several adults during his travels in Ecuador. His species determination for these larvae was based on associated adult specimens collected in the same locality. Specimens are housed at ZMHB .

Description. Width of head capsule 5.0 mm. Cranium ( Fig. 2 ). Color of epicranium, clypeus, labrum reddish-brown; frons reddish-brown with anterior frontal angles black; mandibles reddish-brown with apex black. Surface of epicranium finely rugose, with 2 short, basal setae; 10 short to long, lateral setae; 2 moderately long, dorsoepicranial setae. Frons finely rugose basally, gradually becoming sparsely punctate apically; with 1 anterior frontal angle seta, 1 posterior frontal seta, 1 anterior frontal seta at each side. Clypeus ( Fig. 2 ). Shape subtrapezoidal. Surface rugopunctate, punctures sparse. With 2 moderately long, anterior clypeal setae; 2 moderately long, exterior clypeal setae. Labrum ( Fig. 2 ). Form subovate, symmetrical. Base with 2 short setae, disc with 3–4 moderately long setae, margin with 2–3 moderately long setae, subapex with approximately 7 moderately long setae. Epipharynx ( Fig. 3 ). Form suboval. Plegmata absent. Corypha with 4 moderately long, thick setae. Acanthoparia with 11–12 short, sickleshaped setae. Chaetoparia with approximately 31 moderately long, thick setae (left side); approximately 38 moderately long, thick setae on disc; approximately 13 short, thick setae on base (right side). Acroparia with 9 long, thick setae. Dexiotorma long, pternotorma weakly developed. Laeotorma long, shorter than desiotorma, with pternotorma well-developed. Sensory cone well-developed, equal in size to left pternotorma. Epizygum sclerotized, prominent. Haptomerum with approximately 8 heli. Mandibles. Left mandible ( Figs. 6a, 7b ). Scissorial region with 3 teeth. Dorsal surface with 9 long setae at external margin; 9 dorsomolar setae; 3–4 short, dorsoexterior setae. Molar area with 2 lobes, acia elongate. Basomolar region with 13 moderately long setae. Stridulatory area suboval, with approximately 40 ridges. Ventral process welldeveloped. Ventral-exterior region with 5–6 short, thick setae laterad of stridulatory area. Right mandible ( Figs. 6b, 7a ). Scissorial region with 3 teeth. Molar area trilobed. Dorsal surface with 10 dorsomolar setae. Calx prominent, with 6 thick setae. Ventral surface with suboval stridulatory area with approximately 40 ridges. Ventral process well-developed. Ventral-exterior region with 5–6 short, thick setae laterad of stridulatory area. Lateral surface with 8 long setae. Maxilla ( Fig. 5 ). Galea with 1 uncus; ventral surface with 5–6 short, thick setae. Palpus 4-segmented. Lacinia with 3 sharp unci, 20 moderate to long setae. Stipes with 11 short stridulatory teeth. Truncate process present. Cardo with approximately 4–5 long setae. Hypopharynx ( Fig. 4 ). Hypopharyngeal sclerome asymmetrical, right side with raised truncate process. Left lateral lobe with approximately 11 moderately long setae. Apex of glossa with 4 moderately long setae; disc of glossa with 13 unciform, thick setae mixed with 8–10 moderately long setae. Labium. Apex with approximately 8 short setae. Prementum I with 6 short, 2 long, thin setae. Prementum II with 3 short, lateral setae. Labial palpus 2-segmented. Antenna. 4 segmented. Apical segment with 1 dorsal sensory spot, 3 ventral sensory spots. Second segment 1.7 times longer than first segment. Apical segment with acute apex; third segment with elongate process at apex. Spiracles ( Fig. 8 ). Respiratory plate C-shaped, surrounding flattened bulla; distance between respiratory lobes less than diameter of bulla; plate with approximately 16 holes across diameter, holes suboval. Thoracic spiracle 0.3 mm wide, 0.4 mm high, length slightly shorter than first abdominal spiracle. Abdominal spiracles 1–8 subequal in length. Abdominal spiracles 4–8 round, slightly wider than abdominal spiracles 1–3. Dorsal body vestiture ( Fig. 1 ). First thoracic segment with 32 short to moderate, slender setae. Second thoracic segment with 22

THE COLEOPTERISTS BULLETIN 56(3), 2002 441

short to long, slender setae. Third thoracic segment with 34 short to long, slender setae. Abdominal segment I with 2 short setae mixed with 9 long, slender setae. Abdominal segment II with 40 short, thick setae mixed with 18 long setae. Abdominal segment III with 54 short, thick setae mixed with 22 long, slender setae. Abdominal segment IV with 96 short, thick setae mixed with 16 long, slender setae. Abdominal segment V with 112 short, thick setae mixed with 28 long, slender setae. Abdominal segment VI with 134 short, thick setae mixed with 10– 16 long, slender setae. Abdominal segment VII with 12 short, slender setae mixed with 44 moderate to long, slender setae. Abdominal segment VIII with 20 long, slender setae. Abdominal segment IX with 11 long, slender setae mixed with 3 short, thin setae. Abdominal segment X with approximately 90 moderate to long, slender setae mixed with 20 short, slender setae. Pleural lobes with 2–10 short to long, slender setae. Venter. First to third thoracic segments each with 18–24 moderate, slender setae; abdominal segments each with 4–22 short to moderate, slender setae. Raster. Anal slit slightly bisinuate. Dorsal anal lobe with approximately 30

442 THE COLEOPTERISTS BULLETIN 56(3), 2002

48 Palidia absent; tegilla with approximately 48 hamate setae mixed with 6 moderate to long, slen- der setae; campus with 4 moderately long, thin setae. Barbula with 9 moderate to long, slender setae at each side. Legs ( Fig. 1 ). Length 4.9–8.0 mm (legs gradually increasing in size from prothoracic to metathoracic leg). Coxae, trochanters, and femora with 36–53 moderate to long, slender setae; tibiotarsus with 12–18 moderately long setae. Tarsunguli of prothoracic, mesothoracic, metathoracic ( Fig. 9 ) legs well-developed, with 1 prebasal seta, 1 preapical seta, 4–5 distotarsal setae.

short, sparse setae mixed with 20 moderately long setae. Lower anal lobe with approximately

hamate setae; ventral anal slit area with approximately 32 short to moderate, slender setae. Remarks. Platycoelia gaujoni differs from P. lutescens by the following combination of characters: epipharynx with laeotorma shorter than dexiotorma ( Fig. 3 ) (longer than dexiotorma in P. lutescens ); mandible with three scissorial teeth ( Figs. 6a–b, 7a–b ) (two scissorial teeth in P. lutescens ); abdominal spiracles round (elongate in P. lutescens ).

Figures

Figs. 1–9. Platycoelia gaujoni third instar larva. 1) Habitus; 2) frontal view of head; 3) epipharynx; 4) labium and hypopharynx; 5) dorsal view of maxilla; 6) ventral view of a) right mandible and b) left mandible; 7) dorsal view of a) left mandible and b) right mandible; 8) thoracic spiracle; 9) tarsungulus of posterior leg.