| Summary: | Chondrichthyes are one of the oldest and most ecologically diverse groups of jawed vertebrates. Their K-selective reproductive traits make them vulnerable to overfishing. Chimaerid are also a frequent by-catch of deep-water fisheries. The Chimaeriformes order are allocated into three different families: Callorhinchidae, Rhinochimaeridae and Chimaeridae (Weigmann 2016). Furthermore, the family Chimaeridae only includes two genera: Chimaera and Hydrolagus. Recently, several new species have been described (Iglesias et al., 2022), including Chimaera opalescens from deep-sea assemblages (Luchetti et al., 2011). However, previous records of Chimaera opalescens were erroneously classified as Chimaera monstrosa (Luchetti et al., 2011; Catarino et al., 2020), due to their similar morphology (Luchetti et al., 2011).
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