Oocyclus ornatus, 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 : 16-18

Oocyclus ornatus n. sp.

( Figs. 11 , 23 )

Type Locality. 9.3 km after private gate, Tapantí National Park, Cartago Province, Costa Rica.

Type Material. Holotype. Male. “ COSTA RICA: Cartago Prov./ Tapanti Nat. Park; 7.I.2004 / 9.3 km after gate; AS­04­006/ A. E. Z. Short & D. J. Lebbin”, “ HOLOTYPE / Oocyclus / ornatus / Short & Perkins” ( INBIO). Paratypes (6). COSTA RICA: Cartago Prov., same data as type — (1 AEZS); Tapantí N. P., 1.5 km after gate, 1620m elev., 8.i.2004, rock seep, A. E. Z. Short & D. J. Lebbin leg., AS­04­011 (1 AEZS, 1 INBIO, 1 MCZ, 1 USNM); Tapantí N. P., 3.6 km after gate, 1600m elev., 8.i.2004, pools, A. E. Z. Short & D. J. Lebbin leg., AS­04­014 (1 INBIO).

Differential Diagnosis. Elytra with 10–12 bright blue iridescent maculae, without distinct rows of punctures. Mentum dark brown, similar in color as the venter of the head. Setae on Mesosternum hairlike. Superficially similar to O. maculatus which also may have distinct blue maculae, but that species has spines on the mesosternum and is less convex in lateral view.

Description. Size and Form. Total Length= 2.5–2.8mm. EL/EW=1.11. Oval, moderately convex. Elytra slightly longer that wide. Color. Dorsum black, with general green iridescence, which is more distinct on head and pronotum. Each elytron with 10–12 circular iridescent blue spots. Maxillary palpi yellow, with tip of apical segment slightly darkened. Labial palpi yellow. Mentum and stipes dark brown to black, same color as venter of head. Anterolateral corners of pronotum with pale spot. Sternum and ventrites dark brown to black. Legs yellow, with femora slightly darkened basally and along anterior edge. Epipleura and pseudoepipleura yellow to light brown. Head. Punctation on frons, clypeus and labrum moderately fine; distance between punctures 1– 2 x width of one puncture. Scape subequal in length as segments 2–5, segment 2 subequal or longer in length than segments 3–5, segments 3 and 4 subequal in length; three club segments nearly subequal in length. Maxillary palpi ¾ width of labrum; segments 2 and 3 subequal with apical segment slightly longer. Labial palpi subequal to length of mentum; apical two segments subequal in length. Labrum with 3–4 setiferous systematic punctures centrally. Clypeus without detectable systematic punctures. Frons with irregular row of systematic punctures mesad of each eye. Mentum quadrate, anterior margin slightly convex and with small indentation anteromedially; anterior half with field of large punctures bearing long setae. Thorax. Dorsal punctation of pronotum moderately fine, slightly more impressed on elytra; uniform in size; distance between punctures 2– 3 x width of one puncture. Posterolateral corners of pronotum rounded. Lateral margin of pronotum with row of short setiferous punctures; anterior and posterior series of setiferous systematic punctures almost undetectable; largely obscured by general punctation; setae recumbent. Rows of punctures on elytra indistinct and not generally detectable from surrounding punctation; several punctures bearing short recumbent seta. Lateral margin of elytra with row of setiferous punctures, denser in posterior half. Prosternum carinate medially, with two long setae anteromedially; setae longer than narrowest width of prosternum. Mesosternal process about as long as wide; with 3–5 hair­like setae near apex. Metasternum with oval glabrous area posteromedially, about as long as wide; slightly less than half the total length of metasternum. Procoxae densely pubescent, with a few short spines posteriorly. Protibia with 6–7 spines on dorsal face. Protarsal segments 1–4 small, subequal in length; segment 5 as long as segments 1–4. Hind femora glabrous. Abdomen. Ventrites sparsely pubescent; setae recumbent to decumbent; subequal in length to longest setae around margin of metasternal glabrous area. Area between setiferous punctures rugose on posterior half of fifth visible ventrite. Fifth exposed ventrite entire. Aedeagus ( Fig. 23 ) with ventral sides of parameres distinctly wider than dorsal sides; inner margin of dorsal sides broadly curved, tips slightly curved inwards. Tips of median lobe bifid, nearly reaching the apex of the parameres. Basal piece broad and short, much shorter than length of parameres; base narrowed and broadly rounded.

Distribution. Costa Rica.

Etymology. Ornatus , L. Named after the bright blue iridescent maculae on each elytron. Used here as a noun in apposition.

Figures

FIGURE 11. Oocyclus ornatus n. sp. holotype. Dorsal and lateral habitus.

FIGURES 20 – 23. Oocyclus aedeagi, dorsal views. Scale bars = 0.2 mm. – 20. O. maculatus Sharp (holotype). – 21. O. maculatus Sharp (specimen from Panama). – 22. O. muscus n. sp. (holotype). – 23. O. ornatus n. sp. (holotype).