Ephydrolithus jacobinensis, Amorim-Junior & Nascimento & Hamada, 2024

Ephydrolithus jacobinensis sp. nov.

( Fig. 2A–D View FIGURE 2 )

Type material. Holotype male deposited at INPA, labeled: “ BRAZIL, Bahia, Miguel Calmon / Cachoeira do Jajai, Parque Sete Passagens / 11º23’35.6”S 40º32’16.3”W / 950 m a.s.l. / 25.xii.2022 —seepage habitat near the waterfall, leg. Amorim-Junior, G.P. ” GoogleMaps . Paratypes (15): deposited at INPA: 6 male, 5 female: “ BRAZIL, Bahia, Jacobina / Cachoeira da Viúva / 11º09’28.3”S 40º29’54.9”W / 592 m a.s.l. / 20.xii.2022 —moss on seeping rocks near the waterfall, leg. Amorim-Junior, G.P. ”; deposited at GoogleMaps MZUSP: 1 male, 2 female, same data as holotype; 1 male: “ BRAZIL, Bahia, Miguel Calmon / Cachoeira Bico do Urubu , Parque Sete Passagens / 11º24’07”S 40º32’18.7”W / 684 m a.s.l. / 26.xii.2022 —seepage habitat near the waterfall, leg. Amorim-Junior, G.P. ” GoogleMaps .

Differential diagnosis. Ephydrolithus jacobinensis sp. nov. closely resembles Ephydrolithus ogmos Girón & Short 2019 by sharing well-defined striae. However, the new species can be easily distinguished by having striae 1–5 well-defined, punctate, each placed in a deep groove along the entire length of the elytra; punctate striae 6–10 are similar to striae 1–5 but starting at the posterior third of the elytra; in E. ogmos elytra with well-developed striae along the posterior half and reduced serial punctures. Aedeagus of E. jacobinense with parameres 0.2 × the greatest width of the median lobe, while E. ogmos has parameres 0.7 × the greatest width of the median lobe.

Description. Body length 3.3–4.0 mm (n = 16, mean = 3.93); width, 1.8–1.9 mm. Body elongate oval ( Fig. 2A View FIGURE 2 ), strongly convex ( Fig. 2B View FIGURE 2 ) in lateral view. General dorsal coloration dark reddish, except margins of pronotum and elytra slightly lighter, with reddish-brown tone; ventral coloration dark, except legs which are reddish-brown; tarsi and antennomeres 1–6 yellow, three terminal antennomeres of antennal club slightly darker than antennomeres 1–6. Posterior elevation of mesoventrite ( Fig. 3C View FIGURE 3 ) creating prominent anterior ridge with well-defined spine. Elytra with well-defined punctate striae along deep grooves ( Fig. 3A View FIGURE 3 ); striae 1–5 occurring along entire length of elytra and striae 6–10 starting at posterior third of elytra; ground punctures uniformly distributed among punctate striae. Pro-and mesofemora covered with hydrofuge pubescence along basal half; metafemora with hydrofuge pubescence along basal 2/3 of anterior margin, and with glabrous tibial grooves. Apex of fifth abdominal ventrite rounded ( Fig. 3D View FIGURE 3 ). Aedeagus ( Fig. 4A View FIGURE4 ) with basal piece 0.7 × the length of parameres; parameres nearly 0.2 × the greatest width of the median lobe, with outer margins slightly sinuate; apex of parameres rounded, obliquely directed inward, each with four apical setae; apex of median lobe triangular with a slight constriction, narrowly rounded.

Female. No visible sexual dimorphism. Genitalia ( Fig. 5B View FIGURE 5 ) with paraproct 0.4 × length of stylus; proctiger with fringes of setae on distal margin, broad at the base and tapering towards apex; medial region of the proctiger with apex truncate; paraproct with long seta inserted at apex; gonostylus with three apical setae, median seta at least 5 × longer than lateral ones.

Etymology. The specific epithet refers to Jacobina municipality ( Bahia), in the northern portion of the Chapada Diamantina, Brazil, one of the localities where the new species was collected.

Distribution ( Fig 1 View FIGURE 1 ). Northern portion of the Chapada Diamantina, Bahia state, Brazil.

Remarks ( Fig 6 View FIGURE 6 ). This species was collected in a vertical seep on a rock with moss near the riverbank.