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

Abstract

Abstract. A male representative of the extinct species Calomicrus eocenicus Bukejs et Bezděk, 2014 (Chrysomelidae: Galerucinae) is found and described for the first time from Eocene Baltic amber using X-ray microtomography. The aedeagus is well preserved within the body cavity of the specimen, and it is illustrated in detail. This fossil species exhibits distinct sexual dimorphism: the male has a smaller total body size, as well as a copula-adapted modification in abdominal ventrite 5 (apical margin deeply trilobed, with round medial fovea present); meanwhile the female is larger in body size and has a simple abdominal ventrite 5 (without fovea, non-incised and widely rounded apically). Similar sexually dimorphic characters are typical for extant members of the tribe Luperini, and this report is the first time that they are described in an Eocene species. The known sexually dimorphic characters present in Coleoptera within Eocene Baltic amber are briefly discussed.

A second fossil species of the enigmatic rove beetle genusCharhyphusin Eocene Baltic amber, with implications on the morphology of the female genitalia (Coleoptera: Staphylinidae: Phloeocharinae)

“…2018, 2020; Bukejs et al . 2020a, b; Shavrin & Kairišs 2020, 2021; Alekseev et al . 2021; Perreau et al .…”

“…2020; Kypke & Solodovnikov 2020; Shavrin & Yamamoto 2020) and in removing certain extra body parts from reconstructions (e.g., Perreau & Tafforeau 2011; Bukejs et al . 2020a, b). Our attempt to visualise the holotype of † Charhyphus serratus sp.…”

Rayos X y resonancia magnética en la entomología: principios y aplicaciones

“…Otra metodología que permite estudiar la anatomía y morfología del cuerpo completo o secciones de interés de los insectos es la reconstrucción digital de modelos en 3D, la cual facilita el estudio en diversas áreas de la entomología como en sistemática, taxonomía, estudios del desarrollo ontogénico, análisis funcionales y procesos evolutivos (Triplehorn y Johnson, 2005;Betz et al, 2007;Büsse et al, 2015;Büsse et al, 2016;Ijiri et al, 2018;Bukejs et al, 2020).…”

“…La µCT de alta resolución permite reconstruir modelos en 3D de estructuras externas e internas (Büsse et al, 2016). Este tipo de imagenología es de gran apoyo para esquematizar y mejorar la comprensión del desarrollo y anatomía de los insectos (Bukejs et al, 2020). Büsse et al (2015) estudiaron la musculatura torácica de dos especies de Epiophlebia.…”

The First Ptilodactyla Illiger, 1807 (Coleoptera: Dryopoidea: Ptilodactylidae) Described from Eocene Baltic Amber

“…These techniques were recently successfully applied in a number of paleontological studies dealing with various animal taxa, including both vertebrates [11,12] and invertebrates [13][14][15]. Regarding Coleoptera (beetles), the micro-CT was used in some studies focused on the Burmese amber [10,16], but it is especially successful in reconstructing the morphology of specimens from Baltic amber (including genitalia and fine morphology of specimens with body length under 1 mm) [17][18][19][20].…”