A new species of cloud fish of the genus <i>Hypsolebias</i> from Northeast Brazil (Cyprinodontiformes: Rivulidae)

Ramos, Telton P. A.; Nielsen, Dalton T. B.; Abrantes, Yuri G.; Lira, Fabio Origuela de; Lustosa-Costa, Silvia Y.

doi:10.1590/1982-0224-2023-0068

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Original Article • Neotrop. ichthyol. 21 (3) • 2023 • https://doi.org/10.1590/1982-0224-2023-0068 linkcopy

A new species of cloud fish of the genus Hypsolebias from Northeast Brazil (Cyprinodontiformes: Rivulidae)

Authorship SCIMAGO INSTITUTIONS RANKINGS

A new species of cloud fish of the genus Hypsolebias is described from a temporary pool in the rio Trairi basin, Rio Grande do Norte State, Brazil. It is the first record of the genus Hypsolebias for the basin. The new speciesbelongs to the H. flammeus species-group, which is composed of the species H. alternatus, H. brunoi, H. delucai, H. fasciatus, H. longignatus, H. marginatus, H. multiradiatus, and H. flammeus. The new species differs from all other species of the group, except H. flammeus, H. multiradiatus,and H. brunoi, by male color pattern and the presence of a metallic blue sheen surrounding the black spots of females. It differs from H. flammeus, H. multiradiatus and H. brunoi by dorsal and anal fin shape (both rounded vs. pointed) and by the orientation of the reddish-brown bars on the body and anal fin of males (diagonal vs. vertical). The new species differs from its congeners of Northeast Brazil mainly by the higher number of dorsal fin rays in males and the higher number of scales in the longitudinal series.

Keywords:
Annual fishes; Caatinga; Cynolebiinae; Semiarid; Temporary pools

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Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Departamento de Biologia Animal e Vegetal, CCB, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Km 380, Cidade Universitária, 86055-900, Londrina, Paraná, Brazil, Phone +55(43)3371-5151 - Londrina - PR - Brazil
E-mail: neoichth@nupelia.uem.br

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	Holotype	Paratypes
	Male	Male	Female
Standard length (mm)	44.9	42.7–48.4	34.9–40.4
Percentage of standard length
Body depth	43.2	38.2–42.6	37.5–39.3
Caudal peduncle depth	17.3	15.8–18.2	14.9–16.0
Pre-dorsal length	44.5	40.4–43.8	52.4–57.3
Pre-pelvic length	41.1	43.1–45.0	50.5–63.6
Length of dorsal-fin base	45.9	44.4–48.4	25.5–29.1
Length of anal-fin base	40.4	38.5–43.7	24.9–31.4
Caudal-fin length	30.2	26.3–31.9	24.4–28.7
Pectoral-fin length	23.3	20.8–21.6	20.1–21.7
Pelvic-fin length	7.3	8.3–9.7	9.0–10.6
Head length	29.4	27.2–29.5	23.3–30.1
Percentage of head length
Head depth	111.2	85.1–107.4	98.8–130.7
Head width	59.7	60.0–66.7	60.7–76.9
Snout length	20.1	21.7–22.3	23.7–29.6
Lower jaw length	20.4	40.0–40.6	34.2–45.9
Eye diameter	28.0	25.1–28.1	24.3–33.1