Ephydrolithus jacobinensis Amorim-Junior & Nascimento & Hamada 2024, sp. nov.
Creators: name: Amorim-Junior, Gilson P.
name: Nascimento, Jeane M. C.
name: Hamada, Neusa
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Hydrophilidae
Ephydrolithus
Ephydrolithus jacobinensis

description: Ephydrolithus jacobinensis sp. nov.
(Fig. 2A–D)
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. ”. 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 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. ”.
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), strongly convex (Fig. 2B) 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) creating prominent anterior ridge with well-defined spine. Elytra with well-defined punctate striae along deep grooves (Fig. 3A); 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). Aedeagus (Fig. 4A) 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) 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). Northern portion of the Chapada Diamantina, Bahia state, Brazil.
Remarks (Fig 6). This species was collected in a vertical seep on a rock with moss near the riverbank.
description: Published as part of 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, pp. 54-66 in Zootaxa 5443 (1) on pages 55-59, DOI: 10.11646/zootaxa.5443.1.2, http://zenodo.org/record/10996834