Hypsolebias hamadryades Costa, Amorim & Mattos, 2018

Family:  Rivulidae (Rivulines), subfamily: Cynolebiinae
Max. size:  2.69 cm SL (male/unsexed); 2.37 cm SL (female)
Environment:  benthopelagic; freshwater
Distribution:  South America: Brazil.
Diagnosis:  This species can be distinguised from its congeners by the following set of characters: males lack the dark greenish grey bars on the anterior portion of the flank; males have transverse blue stripes on the unpaired fin wider than interspace. The body coloration of males can also be distinguished by a combination of the following characters: presence of transverse blue stripes in dorsal fin and one basal row of blue spots; most of the anal fins have transverse blue stripes; presence of blue bars on most portion of caudal fin; 8-10 light red bars between humeral region and the anterior part of the caudal peduncle; dorsal-fin origin anterior to anal-fin origin in males; and having 23 or 24 caudal-fin rays (Ref. 128003).
Biology:  Maximum length based on type specimen, to be replaced with a better reference (Ref. 128003).
IUCN Red List Status: Critically Endangered (CR); Date assessed: 04 January 2021 (B1ab(iii)+2ab(iii)) Ref. (130435)
Threat to humans:  harmless


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