Phaenostoma d’Orchymont, 1937

Gustafson, Grey T. & Short, Andrew E. Z., 2010, Redescription of the Neotropical water scavenger beetle genus Phaenostoma (Coleoptera: Hydrophilidae) with description of two new species, Acta Entomologica Musei Nationalis Pragae (suppl.) 50 (2), pp. 459-469 : 468

publication ID	https://doi.org/10.5281/zenodo.4468167
DOI	https://doi.org/10.5281/zenodo.4477070
persistent identifier	https://treatment.plazi.org/id/03DD87F7-0003-FF89-23F5-FC395914DF26
treatment provided by	Felipe (2021-01-26 12:23:25, last updated 2024-11-27 14:27:55)
scientific name	Phaenostoma d’Orchymont, 1937
status

Treatment

Key to the species of Phaenostoma d’Orchymont, 1937 View in CoL

1 Size greater than 2.8 mm. Elytral ground punctation not impressed in recessed ‘disc’ punctures ( Fig. 1 View Fig ). Parameres wider, nearly parallel-sided in basal ¾, slightly curved inward apically ( Figs. 2A, C, D View Fig ). ................................................................................................ 2

– Size less than 2.4 mm. Elytral ground punctation impressed in recessed ‘disc’ punctures ( Fig. 3 View Fig ). Parameres very narrow, arcuatelly bent inward from base to apex ( Fig. 2B View Fig ). ..... .............................................................................................................. P. kontax View in CoL sp. nov.

2 Size generally larger (> 3.0 mm). Aedeagus with apex of parameres strongly sinuate ( Fig. 4A View Fig ). ...................................................................................... P. posticatum ( Sharp, 1887) View in CoL

– Size generally smaller (<3.0 mm). Aedeagus with apex of parameres slightly inwardly curved ( Figs. 4 View Fig C–D). ..................................................................... P. stochasma View in CoL sp. nov.

References

d'ORCHYMONT A. 1937: Sphaeridiini bromeliadicoles nouveaux (Coleoptera: Hydrophilidae, Sphaeridiinae). Annals and Magazine of Natural History, Series 10 20: 127 - 140.

SHARP D. 1887: Insecta. Coleoptera. Vol. 1, part 2 (Haliplidae, Dytiscidae, Gyrinidae, Hydrophilidae, Heteroceridae, Parnidae, Georissidae, Cyathoceridae, Staphylinidae). In: GODMAN F. D. & SALVIN O. (eds.): Biologia Centrali-Americana. Vol. 16. Taylor and Francis, London, xv + 824 pp.

Figures

Fig. 1. Dorsal and ventral habitus of Phaenostoma posticatum (Sharp, 1887) (Costa Rica). Scale bar = 1.0 mm.

Fig. 2. Sternal process of Phaenostoma species. A – P. kontax sp. nov.; B – P. posticatum (Sharp, 1887); C – P. stochasma sp. nov.

Fig. 3. Elytron of Phaenostoma kontax sp. nov. A – entire elytron; B – enlargement of elytral surface.

Fig. 4. Aedeagi of Phaenostoma species. A – P. posticatum (Sharp, 1887) (Costa Rica); B – P. kontax sp. nov. (holotype); C – P. stochasma sp. nov. (holotype; Costa Rica); D – P. stochasma sp. nov. (paratype; Venezuela). Scale bar = 0.2 mm.