Further description ofCatops nathaniPerkovsky 2001 from Late Eocene Baltic amber (Coleoptera: Leiodidae: Cholevinae: Cholevini) using phase contrast synchrotron X-ray microtomography

Description of the male of fossil <i>Calomicrus eocenicus</i> Bukejs et Bezděk (Coleoptera: Chrysomelidae: Galerucinae) from Eocene Baltic amber using X-ray microtomography

“…X-ray microtomography data obtained from lab-based machines or synchrotron beamlines have allowed sex determination in fossils without visibly exposed genitalia. The optically hidden, internal genitalia have been successfully studied in fossil species of Carabidae (Schmidt et al, 2016(Schmidt et al, , 2019Schmidt and Michalik, 2017), Latridiidae (Reike et al, 2017), Leiodidae (Perreau and Tafforeau, 2011;Perreau, 2012;Perreau and Perkovsky, 2014), Merophysiidae (Reike et al, 2020), Mycetophagidae (Alekseev et al, 2020b), Tenebrionidae (Nabozhenko et al, 2020), and other coleopteran families. To date, the sexual dimorphism that has been discovered in Eocene Baltic amber beetles can be characterized as "evolutionarily stable" and limited to characters known in present-day relatives: no new sexually dimorphic characters have been discovered in Eocene fossils.…”

Morfologia pretarsal, anatomia cefálica, e a evolução de Cholevinae (Coleoptera: Leiodidae)

“…Among leiodids, there are only some cases where these structures are illustrated (e.g. Leschen, 2000;Moldovan et al, 2007;, and frequently not in detail (as in Wheeler, 1979;Roubik & Wheeler, 1982;Peck, 1998;Peck & Cook, 2011;Perreau & Perkovsky, 2015 [of an amber fossil]). As these and other studies indicate, the variation of MTS offers a chance to explore a remarkable diversity of attachment structures within a single beetle family.…”