Omniops hanseni, Perkins, P. D. & Short, A. E. Z., 2004

Perkins, P. D. & Short, A. E. Z., 2004, Omniops gen. n. and two new species of Hydrophilini from Papua New Guinea (Coleoptera: Hydrophilidae), Zootaxa 494, pp. 1-14 : 4-5

Omniops hanseni sp. n.

Figs. 6 , 12–17

Material Examined. Holotype female: “Neu Guinea 15.8.81 / Baliem Tal NG 6/ leg. A Schöller”. Deposited in the NMW.

Differential Diagnosis. Omniops hanseni is very distinct from O. fasciatus , recognized by the larger size (2.85 mm vs. 2.33 mm), the proportionally larger elytra (elytral length/pronotal width 1.40 vs. 1.27), the elytral color pattern ( Figs. 5, 6 ), the serial elytral punctures, the much more extensively confluent microreticulation of the head and pronotal punctation, and the anteromedial peg­like process of the metasternum ( Fig. 15 ).

Description. Size: Holotype (length/width, mm): Body 2.85/1.64; head 0.52/0.86; pronotum 0.56/1.49; elytra 2.08/1.64. Color: Dorsum of head dark brown except yellow on clypeus in front of eyes and narrowly across anterior margin, yellow area attaining level of medial margin of eye; maxillary palpi and antennae light brown to yellow; legs medium brown; pronotum dark brown except yellow border laterally, width of border slightly less than length of eye, color transition gradual; each elytron with nine dark brown longitudinal bands (including sutural band), except bands #8 and #9 very short and subcoalesced, other bands slightly wider than light brown to yellow bands separating them, bands straight and parallel over posterior two­thirds of length, in anterior one­third band #2 converging anteriorly with #3 and band #4 sharply angled medially, resulting in color pattern with four yellow maculae ( Figs. 6 , 12 ). Dorsal sculpture: Almost all of clypeus and frons dull, microreticulation of punctures completely confluent except on center of clypeus and frons where shining interpunctal surfaces form subreticulate pattern; frontoclypeal suture nonmicroreticulate, shining. Pronotal disc with microreticulation of many punctures confluent, forming vaguely L­shaped area on right side of midline, and mirror image shape on left side; very narrow, non­punctate midlongitudinal line; anteriorly non­confluent punctures separated by less than diameter of microreticulate area of each puncture; small, circular, non­punctate area on each side of midline, separated from each other by slightly more than their diameter, each area circled by punctures and with a more prominent puncture at posterior margin; laterally, from level of medial margin of eye to lateral margin of pronotum, entirely confluent microreticulation except oval area about size of eye with some shining interpunctal surfaces, area located behind angulate part of anterior pronotal margin. Venter: Metasternum with smooth, shining, peg­like process anteromedially ( Fig. 15 ); triangular area between mesocoxae flat, smooth and shining; hydrofuge pubesence longer on disc than laterally, absent from small area basomedially and narrow band basally in front of metacoxae. Fifth ventrite (slide mount) with posteromedial setae similar to that of O. fasciatus ( Fig. 11 ).

Etymology. Named after the late Michael Hansen.

Figures

FIGURES 5 – 6. Frontal habitus of holotypes. — 5. Omniops fasciatus. — 6. Omniops hanseni.

FIGURES 12 – 13. Omniops hanseni holotype. Dorsal and lateral habitus.

FIGURES 14 – 15. Omniops hanseni holotype. — 14. Ventral habitus. — 15. Pro­, meso­, and metasternum.

FIGURES 16 ­ 17. Omniops hanseni holotype. — 16. Dorsum of head. — 17. Venter of head.

FIGURES 10 – 11. Omniops fasciatus holotype. — 10. Aedeagus. — 11. Fifth ventrite.