Oocyclus grandis, Short, A. E. Z. & Perkins, P. D., 2004

Short, A. E. Z. & Perkins, P. D., 2004, A revision of Oocyclus Sharp of Mexico and Central America (Coleoptera: Hydrophilidae), Zootaxa 783, pp. 1-45 : 11-13

Oocyclus grandis n. sp.

( Figs. 6–7 , 19 )

Type Locality. Waterfall on the Río Carmona, 2 km N. of Carmona, Guanacaste Province, Costa Rica, 30m elev.

Type Material. Holotype. Male: “ COSTA RICA: Guanacaste Prov./Nandayure; 2 km N of Carmona/ Waterfall margin; w/insecticide/ alt. 30m; 15­Jan­2003 (CR­03­06)/ A. Short, R. Roughley, W. Porras”, “ HOLOTYPE / Oocyclus / grandis / Short & Perkins” ( INBIO). Paratypes (383). COSTA RICA: Alajuela Prov., 6.1 km N. Los Lagos, on Los Lagos­Colonia Rd., 870m elev., seeps on Rio San Lorenzo, 12.i.2003, A. Short & R. Roughley leg., CR­03­04 (1 INBIO); Guanacaste Prov., Cerro Azul, road between Carmona & Bella Vista, 800m elev., 16.i.2003, waterfall/seep, A. Short, R. Roughley & W. Porras, leg. (15 AEZS, 28 INBIO); same data as type (8 AEZS, 15 INBIO); Puntarenas Prov., 1.2 km SE of Coronado, 18.vi.2003, waterfall, A. E. Z. Short leg. (1 AEZS, 6 INBIO); San Jose Prov., 19.1 km NE of Dominical on rt. 243, 18.vi.2003, waterfall & seeps, A. E. Z. Short leg. (1 INBIO). GUATEMALA: Baja Verapaz, 20 mi. S. Rabinal, 12.vi.1974, M. E. & P. D. Perkins leg. (3 USNM); Chiquimula, 4 mi. N. Quezaltepeque, 17.vi.1974, M. E. & P. D. Perkins leg. (2 USNM); Jalapa, 12 mi. NW Jalapa, 15.vi.1974, M. E. & P. D. Perkins leg. (38 USNM); Suchitepequez, 1 mi. W. Cocales, 26.vi.1974, M. E. & P. D. Perkins leg (19 USNM); HONDURAS: Comayagua, 6 mi. N. Siguatepeque, 20.vi.1974, M. E. & P. D. Perkins leg. (17 USNM); Ocotepeque, 11 mi. S. Nueva Ocotepeque, 17.vi.1974, M. E. & P. D. Perkins leg. (22 USNM); MEXICO: Jalisco, 12 mi. S. Puerto Vallarta, 21.vii.1974, M. E. & P. D. Perkins leg. (22 USNM); 5 mi. W. Plan de Barrancas, 21.vii.1954, J. MacSwain leg. (6 USNM); Nayarit, Tepic, 15.ix.1953, B. Malkin leg. (24 CAS, 19 USNM); same locality, 23.ix.1953, B. Malkin, leg. (35 CAS, 25 USNM); Oaxaca, 8 mi. S. Valle Nacional, 6.vii.1974, M. E. & P. D. Perkins leg. (75 USNM); Veracruz, Catemaco (8 km SE), El Salto Eyipantla, 30.iii. 1990, Paul J. Spangler leg. (1 USNM). Representative specimens deposited in AEZS, BMNH, CMNC, CMNH, CUIC, ESMC, FMNH, and NMW).

Diagnosis. The largest species of Oocyclus in Central America, only O. substillus is similar in size but the latter has spinose posterior pronotal apices. The long mesosternal process, which bears 6–8 distinct spines, also characterizes this species.

Size and Form. Length= 4.2–5.1mm. EL/EW=1.13. Elongate oval; moderately convex, elytra longer than wide; disc of elytra more convex transversely than longitudinally. Color. Dorsum generally black; anterolateral corners of pronotum distinctly yellow to white. Elytra with irregular patches of bronze or green iridescence. Maxillary and labial palpi yellow. Mentum and stipes brown, slightly paler than venter of head. Sternum brown to dark brown. Base of femora dark brown, gradually becoming light brown distally; tibia and tarsi light brown. Epipleura dark brown; pseudoepileura yellow. Each ventrite brown with light brown patches laterally. Head. Punctation on frons, clypeus and frons uniformly fine; punctures separated by 2–3 widths of one puncture. Antennae with scape subequal in length to segments 2–5, segment 2 subequal to segments 3–5, segments 4–5 equal in length; first two segments of club equal in size, third segment 1.5x longer and moderately compressed laterally. Maxillary palpi slightly shorter than width of labrum; segments 2 and 3 subequal in length, apical segment slightly longer. Labial palpi ¾ length of mentum; apical two segments subequal in length. Labrum without detectable systematic punctures. Clypeus with 4–5 nearly indistinct systematic punctures near each anterolateral margin. Frons with an irregular row of systematic punctures mesad of each eye bearing short recumbent setae. Mentum quadrate, anterior margin slightly convex, with scattered spare punctures of mixed size; slightly rugose anteriorly. Thorax. Dorsal punctation of pronotum and elytra extremely fine, almost obsolete. Posterolateral corners of pronotum angulate but not spinose; lateral margins of pronotum lined with a row of setiferous punctures. Pronotal systematic punctures bearing short recumbent setae, with anterior series forming an irregular row, posterior series forming a diffuse field. Sutural punctation of elytra extremely fine and irregular, not bearing setae. Elytra with six rows of setiferous punctures; first row with punctures very dense anteriorly and becoming more diffuse posteriorly, setae erect on anterior half; rows 2–4 with punctures more irregularly spaced, suberect to recumbent; row 5 irregular and diffuse; row six along lateral edge of elytra, usually recumbent. Lateral margins of elytra slightly explanate anteriorly. Prosternum carinate centrally, with two coarse spines anteromedially. Mesosternal process about 3x longer than wide, with seven coarse spines (occasionally six or eight spines); anterior margin of process before spines thin. Metasternum with elongate­oval glabrous area posteromedially, about 2x longer than wide; about 2/3 width of metasternum. Procoxae pubescent and bearing a number of distinct spines, slightly smaller than those of prosternum. Protibia with 13–15 spines on dorsal face. Protarsal segments 1–4 small, subequal in length; segment 5 as long as segments 1–4; protarsal claws of males slightly enlarged. Hind femora glabrous. Abdomen. Ventrites with dense, uniform pubescence, usually suberect to recumbent; longest setae shorter to subequal in length to longest setae around margin of metasternal glabrous area. Fifth exposed ventrite entire. Aedeagus ( Fig. 19 ) with both dorsal and ventral sides curved; ventral side moderately broader than dorsal side; tips curved inward. Tip of median lobe bifid, not reaching apex of parameres. Basal piece slightly narrowed, evenly and broadly rounded.

Distribution. México, Guatemala, Honduras, Costa Rica.

Etymology. Grandis , L. refers to the large size of this species.

Figures

FIGURE 6. Oocyclus grandis n. sp. holotype. Dorsal and lateral habitus.

FIGURE 7. Oocyclus grandis n. sp. holotype. Ventral habitus.

FIGURES 16 – 19. Oocyclus aedeagi, dorsal views. Scale bars = 0.2 mm. – 16. O. brevicornis Sharp (specimen from Guatemala). – 17. O. catarata n. sp. (holotype). – 18. O. funestus n. sp. (holotype). – 19. O. grandis n. sp. (holotype).