Ephydrolithus, Giron & Short, 2019

Amorim-Junior, Gilson P., Nascimento, Jeane M. C. & Hamada, Neusa, 2024, Ephydrolithus Girón & Short, 2019 (Coleoptera: Hydrophilidae): new species and updated distribution records from Northeast region of Brazil, Zootaxa 5443 (1), pp. 54-66 : 63-64

publication ID	https://doi.org/ 10.11646/zootaxa.5443.1.2
publication LSID	lsid:zoobank.org:pub:E8068525-83FE-4C20-8A89-B0BDAF2A47D5
DOI	https://doi.org/10.5281/zenodo.11034009
persistent identifier	https://treatment.plazi.org/id/A4401E11-FF8A-350D-CCD3-49E9E0C4FD9E
treatment provided by	Plazi
scientific name	Ephydrolithus
status

Treatment

Updated identification key to Ephydrolithus View in CoL species (adapted from Alencar et al. 2022)

1. Elytra with impressed striae (e.g., Fig. 3A View FIGURE 3 and Alencar et al. 2022: Fig. 8a)....................................... 2

- Elytra without impressed striae, but with longitudinal serial punctures or not ( Fig. 3E View FIGURE 3 )............................... 3

2. Elytra with well-defined and impressed striae along the posterior third (see Girón & Short 2019: Fig. 6A View FIGURE 6 )......... E. ogmos

- Elytra with well-defined and impressed striae, forming deep grooves, 1–5 serial punctures along the entire length, and 6–10 start in the posterior third ( Figs. 2A View FIGURE 2 , 3A View FIGURE 3 )................................................. E. jacobinensis sp. nov.

3. Elytra with well-defined serial punctures ( Fig. 2E View FIGURE 2 )........................................................... 4

- Elytra without well-defined serial punctures (e.g., Alencar et al. 2022: Fig. 8d).................................... 5

4. Apex of fifth abdominal ventrite rounded; dorsal coloration orange-brown; outer margins of parameres straight (see Alencar et al. 2022: Fig. 7c)........................................................................... E. mucugensis

- Apex of fifth abdominal ventrite truncate ( Fig. 3H View FIGURE 3 ); dorsal coloration black ( Fig. 2E View FIGURE 2 ; outer margins of parameres moderately sinuate ( Figs. 4B View FIGURE4 )..................................................................... E. dandarae sp. nov.

5. Body strongly convex; 1.8–2.3 mm in length; anterior surface of pro-and mesofemora covered by hydrofuge pubescence along basal half (see Alencar et al. 2022: Fig. 3b View FIGURE 3 )................................................................ 6

- Body moderately convex; 2.4–3.6 mm in length; anterior surface of pro-and mesofemora covered by hydrofuge pubescence along basal two thirds or more (see Alencar et al. 2022: Figs. 2b View FIGURE 2 , 5b View FIGURE 5 )............................................ 7

6. Aedeagus with median lobe 3.4× longer than wide; basal piece 0.74× the length of parameres (see Girón & Short 2019: Fig. 7I).......................................................................................... E. minor

- Aedeagus with median lobe 1.4× longer than wide; basal piece 0.45× the length of parameres (see Alencar et al. 2022: Figs. 7b)............................................................................................ E. cipo

7. Posterior elevation of mesoventrite with a pointed spine (see Alencar et al. 2022: Fig. 6e View FIGURE 6 and Girón & Short 2019: Fig. 7G)..................................................................................................... 8

- Posterior elevation of mesoventrite without a pointed spine.................................................... 9

8. Posterior elevation of the mesoventrite with smooth surface; position of maximum height of the ridge is 0.37× of its longitudinal length (antero-ventral) (see Alencar et al. 2022: Fig. 9a); basal width of the parameres is 0.52× the maximum width of the median lobe (see Alencar et al. 2022: Fig. 7e).......................................................... E. vivas

- Posterior elevation of the mesoventrite with sculptured surface; position of maximum height of the ridge is 0.55× of its longitudinal length (antero-ventral) (see Alencar et al. 2022: Fig. 9b); basal width of the parameres is 0.38× the maximum width of the median lobe (see Alencar et al. 2022: Fig. 7f)............................................ E. spiculatus

9. Posterior elevation of mesoventrite with a transverse basal ridge that extends anteriorly as a strongly raised longitudinal carina (see Alencar et al. 2022: Fig. 2e View FIGURE 2 )................................................................... E. bentoi

- Posterior elevation of mesoventrite with a transverse ridge extending anteriorly or not, if extending anteriorly, never strongly raised longitudinally (see Alencar et al. 2022: Figs. 5e View FIGURE 5 )...................................................... 10

10. Aedeagus with gonopore located near midpoint of median lobe; apical region of parameres strongly sinuate (see Alencar et al. 2022: Fig. 7d)................................................................................... E. serro

- Aedeagus with gonopore located preapically in the median lobe; apical region of parameres simply rounded or truncate (see Alencar et al. 2022: Fig. 7e)............................................................................ 11

11. Aedeagus with parameres 1.2–1.3× longer than basal piece; median lobe 2× longer than its greatest width; outer margins of median lobe at apex straight to slightly sinuate (triangular) (see Girón & Short 2019: Fig. 7E)..................... E. teli

- Aedeagus with parameres 1.5–1.6× longer than basal piece; median lobe nearly 2.5× longer than its greatest width; outer margins of median lobe at apex clearly sinuate (“pinched”) (see Girón & Short 2019: Fig. 7D)................ E. hamadae