Baltistena sergeli ( Ermisch, 1943 ) Batelka & Rosová & Prokop, 2023

Batelka, Jan, Rosová, Kateřina & Prokop, Jakub, 2023, Diversity and morphology of Eocene and Oligocene Mordellidae (Coleoptera), Acta Entomologica Musei Nationalis Pragae 63 (2), pp. 451-478 : 459

Baltistena sergeli ( Ermisch, 1943) comb. nov.

( Figs 5F–J )

Glipostena sergeli Ermisch, 1943: 65 . Holotype: J, Baltic amber.

Type material examined. HOLOTYPE: ( SDEI):, [two white labels with double black frames glued on left and right side of microscope slide, the other labels glued on top of them] ‘ Glipostena [hw] / Sergeli sp. n. [hw] / det. Ermisch 1942 [p; white label] // Ermisch (Type) [hw; double framed white label on the left side of microscope slide] // TYPE [p; in black frame, red label] // SDEI Müncheberg / SDEI-Amb-000647 [p; yellowish label] / coll. Dr.Sergel / ded. Novemb. 1942 [hw; double framed, white label on the right side of the microscope slide]’.

Comments on identification. Terminal palomere of maxillary palpus is malleiform (bean-like in shape), i.e., of type C sensu FRANCISCOLO (1957a), versus equilateral triangular in extant species of Glipostena Ermisch, 1941 , i.e., of type B ( FRANCISCOLO (1957a). Comb formula 7//5/3/2/0 and length and orientation of all combs are very different from those in extant species: combs of G. sergeli are too short, more transverse and more abundant on metatibia and the first three metatarsomeres (for details see under Rovnostena ponomarenkoi ( Odnosum & Perkovsky, 2009)) . To distinguish it from other Eocene Mordellistenini see the key below.

Because of the uncertain generic identity of this species, it is transferred here into Baltistena new collective group.

Figures

Figs 5. A–J – Mordellistenini, Baltic amber. A–E – Baltistena soror (Ermisch, 1941), type: A – habitus. B – middle leg. C – posterior pronotal margin. D, E – head and thorax. F–J – Baltistena sergeli (Ermisch, 1943), holotype: F – habitus; G, H – hind legs; I – maxillary palpomeres IV (black arrows); J – protarsus. Scale bars: A, F, I – 0.5 mm, B – 0.05 mm; C, J – 0.2 mm; D, E, G, H – 0.3 mm.