Callistethus ruteloides Filippini , Galante

Filippini, Valentina, Galante, Eduardo & Micó, Estefanía, 2015, Description of six new species of Anomalini from Costa Rica (Coleoptera: Scarabaeidae: Rutelinae), Zootaxa 3948 (1) : -

Callistethus ruteloides Filippini, Galante , & Micó, new species

Fig. 5

Type material. Holotype: ♂ "Quebrada Segunda, P. N. Tapanti, 1250 m, Prov. Cartago, Costa Rica, G. Mora, May 1992 L-N 194000_560000 / INBIOCRI000959028" deposited in INBIO .

Paratypes (6): 1♂ "Est. Biol. Las Alturas, 1500 m, Coto Brus, Prov. Puntarenas, Costa Rica. M. Ramirez. Mar 1992 L-S 322500, 591300 / INBIOCRI000987456"; 1♀ "Tapantí ( Costa Rica) 1300 m 29-9-06 T. luz 17:00-23:00 Leg.: Micó, García, Galante / CEUA 00019649"; 1♀ "El Copal, Prov. Cartago, Costa Rica. 17/06/2007 Leg. M. Moraga / CEUA 00106211"; 1♀ " COSTA RICA. Prov. Alajuela. Upala. P.N. Volcán Tenorio. Alb. Heliconias. Send. a Laguna Danta. 900 m. 16 JUN 2007. J. D. Gutiérrez. Tp. Luz 2. L_N_299100_424000 #92208 / CEUA 00106212"; 1♀ "Q. Segunda, P.N. Tapantí, Prov. Carta, COSTA RICA. 1300 m. Set 1993. G. Mora, L N 194000_559800 #2326 / INBIOCRI001669692"; 1♀ " PANAMA - CHIRIQUI Santa Clara env. 1546 m 08°51'42,2"N; 082°44'36,5" W 17.6.- 4.7.06; V. Malý lgt. P 7 / coll. Vladislv Malý Česká Rep. Praha" Vladislv Malý ( Česká, Czech Republic), personal collection.

Holotype male description. Body shape oval. Length 17.5 mm. Width 9.8 mm.

Color. Head pale ochre with a sinuate brown macula on frons. Pronotum pale ochre with 2 lateral brown bands. Scutellum pale ochre with red margins. Elytra pale ochre with 2 transversal sinuate beige bands, 1 median and 1 apical. Pygidium and legs ochre. Venter orange-ochre.

Head large, almost 2/3 of the width of pronotum. Clypeus rectangular, with anterior angles widely curved. Clypeus ratio width/length 2.1; surface densely punctate-reticulate, convex; anterior margin straight, nearly as long as frons. Frons moderately punctate, flat. Ocular canthum long, thin, with rounded apex. Interocular ratio (interocular width/width of eye): 3.0. Antenna: ratio funiculus/club 0.6. Mandibles with apex curved ventrally, maxillae with 2nd and 3rd tooth fused together. Labium and labrum quadrilobulate.

Pronotum trapezoidal. Width 1.9 times length. Lateral margins curved. Anterior angles quadrate with blunt vertex; basal angles obtuse, blunt. Basal margin narrow, sinuate, and obliterated in the middle. Surface with fine and dense punctures.

Scutellum. Shape subtriangular, surface sparsely punctate; ratio width/length 1.6.

Elytra with striae defined by regular rows of punctures. Marginal membrane very narrow.

Pygidium strigate. In lateral view slightly convex. Triangular in shape; with short setae on disc, long setae at apical margin.

Mesosternal process long, with tapering apex in ventral view; width at base: 1.0 mm ( Fig. 25 ). Mesometasternal suture at about half the length of the process.

Abdominal sternites with 1–3 rows of setae, denser at sides, and 4–6 rows of punctures per sternite. Terminal sternite strigate, with apical margin thick and sinuate; apical membrane wide.

Legs. Protibia bidentate (Fig. 11); apical tooth long and straight; basal tooth below internal apex of protibia triangular in shape, obtuse. Metatibia slender, slightly narrower subapically. Ratio length/width 4.1. First external carina well developed. Surface rugose. Protarsomere 1 equal in length to protarsomeres 2–4, tarsomeres stout. Protarsal claws: external claw curved, internal claw bifurcate, upper branch equal in length and 2/3 the width of the lower branch, inferior margin sinuate.

Aedeagus ( Fig. 17 ): parameres with a narrow and acute apex in a lateral view, pointing downwards, flattened dorsoventrally; apical portion of ventral plate membranous. Endophallus ( Fig. 23 ) short, with patches of short and long setae in different positions. Ejaculatory duct opening frontal.

Variation. Background color from pale ochre to orange; transversal bands on elytra more or less evident. Female similar to male, antennal club shorter than in male; protibia with longer and wider apical tooth (Fig. 11); internal protarsal claw narrower with curved inferior margin; terminal sternite with slightly sinuate apex.

Body length 17.5–20.1 mm, body width 9.8–11.4 mm. Clypeus w/l: 1.9–2.1. Interocular ratio (interocular width/width of eye): 3.2–4.2. Pronotum w/l: 1.8–1.9. Scutellum w/l: 1.5–1.6. Pygidium w/l: 1.5–1.6. Metatibia w/l: 3.8–4.1. Width of mesosternal process at base: 1.0– 1.2 mm.

Diagnosis. Size large, color pale ochre with darker bands on pronotum and elytra, clypeus long, head large, pronotum short, mesosternal process long, parameres flattened dorsoventrally.

Etymology. Latinized from the name of genus Rutela and suffix -oides, for its general resemblance with species of the tribe Rutelini .

Distribution. Guanacaste and Talamanca mountain ranges, Costa Rica and northern Panama from 900–1600 m, ( Fig. 36 ).

Note. This species is tentatively placed in the genus Callistethus , as it has some distinct features not found in other Callistethus species. It could be placed in a separate genus, but the lack of known similar species would make a proper description and diagnosis of the new genus difficult. Singular characters are: long clypeus (nearly as long as frons); head large (2/3 of pronotum width); mandibles with apex curved ventrally; maxillae with second and third tooth fused together; labrum and labium quadrilobulated; pronotum short; tarsomeres short and stout; mesometasternal suture high, nearly at half the length of the mesosternal process; aedeagus with parameres flattened dorsoventrally.

Figures

FIGURES 1 – 6. Habitus. 1: Anomala aglaos (holotype). 2: A. estrella (holotype). 3: A. inbio (holotype). 4: A. pincelada (holotype). 5: Callistethus ruteloides (holotype). 6: C. yalizo (holotype). Scale = 5 mm.

FIGURES 25 – 26. Mesometasternal process in 25: Callistethus ruteloides (holotype). 26: C. yalizo (paratype, Río Grande de Orosí, Cartago, Costa Rica). Scale = 1 mm.

FIGURES 13 – 18. Shape of aedeagus, lateral view (top), dorsal view (bottom left), ventral view (bottom right). 13: Anomala aglaos (paratype, Isla Bonita, Costa Rica). 14: A. estrella (holotype). 15: A. inbio (holotype). 16: A. pincelada (holotype). 17: Callistethus ruteloides (holotype). 18: C. yalizo (Cerro Chompipe, Heredia). Scale = 1 mm.

FIGURES 23 – 24. Endophallus of 23: Callistethus ruteloides (holotype). 24: C. yalizo (holotype). Scale = 1 mm.

FIGURE 34 – 37. Distribution of 34: Anomala aglaos and A. estrella. 35: A. inbio and A. pincelada. 36: Callistethus ruteloides. 37: C. yalizo.