The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus Author Fikáček, Martin Department of Biological Sciences, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung 80424, Taiwan; & Department of Entomology, National Museum, Cirkusová 1740 CZ- 19300 Praha & Department of Zoology, Faculty of Science, Charles University, Viničná Author Matsumoto, Keita Department of Life Sciences, Natural History Museum, London, SW Author Perkins, Philip BD, United Kingdom; Author Prokin, Alexander Author Sazhnev, Alexey Author Litovkin, Stanislav CZ- 12844, Praha Author Jäch, Manfred A. text Acta Entomologica Musei Nationalis Pragae 2021 Acta. Ent. Mus. Natl. Pragae 2021-02-03 61 1 1 34 http://dx.doi.org/10.37520/aemnp.2021.001 journal article 10.37520/aemnp.2021.001 1804-6487 5037206 9CB2C16A-E2B7-4C17-A310-D538AA061911 Eupotemus taianus sp. nov. ( Figs 11D–F , 12G–I ) Material examined. Hඈඅඈඍඒඉൾ: J (DNA voucher MF2248) ( BMNH ): ʽCÔTE D’IVOIRE, 174m , / Taï NP, Taï Research Station / ( SRET ) / 05°50’00”N 07°20’32.0”W , / 25.III-17.IV. 2017 , MV light // Aristophanous,A., / Aristophanous, M., / Geiser, M., Moretto, P., leg., / BMNH(E) 2019-93ʼ. Differential diagnosis. Very similar to the other species of the E. carinaticollis species group from which it can Fig. 12. Habitus photographs of the species of the Eupotemus carinaticollis species group, holotypes: A–C – E. carinaticollis ( Basilewsky, 1956 ) ; D–F – E. uluguru sp. nov. ; G–I – E. taianus sp. nov. Fig. 13. Known distribution of Eupotemus species.A – species of E. limicola species group; B – species of E. carinaticollis species group. Table 4. Differences of the aedeagi of the Eupotemus carinaticollis group.

E. carinaticollis	E. uluguru sp. nov.	E. taianus sp. nov.
Median lobe proportions	Narrow	Narrow	Wide
(length to width)	(>3× longer than wide).	(>3× longer than wide).	(<3× longer than wide).
Sides of median lobe sub-	Straight to very weakly	Straight to weakly	Strongly convex.
apically	convex.	concave.
Apex of parameres in dorsal	Constricted subapically,	Not constricted, narrow	Constricted subapically,
view	widened at apex.	at apex.	widened at apex.

be reliably distinguished by the male genitalia only. The aedeagus resembles that of E. carinaticollis by the subapically constricted and apically widened parameres but differs in the wider median lobe with convex sides subapically. From E. uluguru it differs in the apically widened parameres. Description. Body 2.8 mm long and 1.5 mm wide. Dorsal surface black. Habitus and sculpture as in Figs 12G–I ; ridge on elytral interval 3 complete throughout; ridge on interval 5 interrupted posteriorly; ridge on interval 7 interrupted in posterior fourth. Elytral punctures connected by low elevated line. Aedeagus (11D–F): 0.90 mm long. Parameres ca. 2.0× longer than phallobase, indistinctly constricted at midlength, strongly constricted subapically, apex widened. Median lobe 2.5× longer than wide, narrowing from midlength to apex, sides convex subapically. Phallobase basally with narrow symmetrical manubrium. Etylomogy. The species name refers to the Taï National Park in which the only known specimen of this species was collected. Adjective. Biology. Unknown, collected at light. Distribution. Known only from the type locality in southwestern Côte d’Ivoire ( Fig. 13B ).