Electrolana Schädel, Hyžný & Haug, 2021 (Crustacea: Isopoda: Cirolanidae), a junior synonym of Cirolana Leach, 1818 and a new species of Metacirolana Kussakin, 1978 from Cretaceous amber of Myanmar

Abstract

Electrolana madelinae Schädel, Hyžny & Haug, 2021 was described from two excellently preserved isopod specimens from ca. 40-million-year-old amber from Myanmar. Appraisal of the two specimens and their comparison to extant genera and species of Cirolanidae show that the genus Electrolana Schädel, Hyžny & Haug, 2021 is a junior synonym of Cirolana Leach, 1818, and that the holotype and paratype represent two distinct species. The holotype is placed in the combination Cirolana madelinae (Schädel, Hyžny & Haug, 2021) comb. nov., and the paratype, a species of Metacirolana Kussakin, 1979, is here diagnosed and named Metacirolana jimlowryi sp. nov. Brunnaega roeperi Polz, 2005 is transferred to Cirolana roeperi (Polz, 2005) comb. nov. Taxonomy Cymothoida Wägele, 1989Remarks. At subordinal level, following Brandt & Poore (2003), the apomorphic states of the anterolateral and ventral attachment of the uropodal peduncle, which articulates ventro-laterally, and the ventrally flat pleotelson unambiguously identifies the suborder as Cymothoida. The plesiomorphic state of five free (unfused) pleonites is a further consistent character, with occasional fusions of pleonites in some Cirolanidae, notably the highly derived cave-dwelling genera (