Laetopsia hydraenoides ( Prokin, Ren & Fikáček, 2010 ) Fikáček & Prokin & Angus & Pono & Marenko & Yue & Ren & Prokop, 2012

Fikáček, Martin, Prokin, Alexander, Angus, Robert B., Pono, Alexander, Marenko, Yue, Yanli, Ren, Dong & Prokop, Jakub, 2012, Revision of Mesozoic fossils of the helophorid lineage of the superfamily Hydrophiloidea (Coleoptera: Polyphaga), Acta Entomologica Musei Nationalis Pragae 52 (1), pp. 89-127 : 96

† Laetopsia hydraenoides ( Prokin, Ren & Fikáček, 2010) comb. nov.

( Figs. 9 , 57, 61 )

Hydrophilopsia hydraenoides Prokin, Ren & Fikáček, 2010: 178 .

Type locality and age. China, Liaoning Province, Shangyuan County, Chaomidian Village, Huangbanjigou [the name of the villige was misspelled in the original descirption].Yixian Formation, Jurassic-Cretaceous boundary,Late Tithonian-Berriasian, ca. 145–140 mya ( REN et al. 2010).An alternative dating was proposed by SWISHER et al. (1999): Lower Cretaceous, Aptian, 124.6 mya (see REN et al. (2010) for discussion on various datings of Yixian formation).

Material examined (3 spec.). HOLOTYPE: CNU 2010021 (piece only). PARATYPE: CNU 2010026 (piece only).ADDI- TIONAL NON- TYPE SPECIMEN: CNU 2009089 (piece only).

Redescription. Body elongate oval, 5.3–6.1 mm long (holotype 6.1 mm). Head with protruding eyes, frontoclypeal suture Y-shaped, with grooved median portion; anterior margin of clypeus straight; labrum transverse, tightly attached to anterior margin of clypeus; setiferous granules missing. Pronotum widest in anterior third, with distinctly angulate lateral margins; surface without setiferous granules, with median longitudinal groove; pronotal flanks narrow. Elytra with striae 1–7 darkened; scutellary stria absent. Mesocoxae contiguous, metaventrite much longer than mesoventrite. Abdomen with 5 ventrites. Legs relatively long.

Note. The species may be easily distinguished from all other Laetopsia species according the distinctly angulate lateral margins of the pronotum. The additional specimen listed above is badly preserved and its assignment to the species is tentative.

Figures

Figs.9–13. Laetopsia gen. nov. 9 – L. hydraenoides (Prokin, Ren & Fikáček, 2010), holotype. 10–11 – L. mongolica (Ponomarenko, 1987) (10 – PIN 3664/1567, holotype; 11 – PIN 3664/1661). 12–13 – L. shatrovskiyi (Prokin, Ren & Fikáček, 2010) (12 – CNU 2010199; 13 – CNU 2010242, holotype). Scale bars: 2 mm (a: Figs. 9, 12–13; b: Figs. 10–11). Abbreviations: ant – antenna; sct – scutellum.

Figs. 53–62.Representatives of Laetopsia gen.nov.53–56 – L.baissensis (Ponomarenko, 1986) (53 – PIN 3064/7016; 54–55 – PIN 3064/6987, piece and counterpiece; 56 – detail of PIN 3064/6987). 57, 61 – L. hydraenoides (Prokin, Ren & Fikáček, 2010), CNU 2010021, holotype (57 – detail of head and pronotum; 61 – general view). 58–60 – L. mongolica (Ponomarenko, 1987) (58 – PIN 3664/1661, detail of head and pronotum; 59 – PIN 3664/1772; 60 – PIN 3664/1567, holotype). 62 – L. bontsaganica (Prokin, 2009), holotype. Scale bars: 1 mm.