Lymexylopsis, Kirejtshuk, 2025

Genus Lymexylopsis gen nov.

Type species Raractocetus balticus Yamamoto, 2019 ; Eocene Baltic amber.

Diagnosis. The list of the diagnostic characters of this new genus is given in the comparison of the genus Eoractocetus gen. nov. (see above).

Notes. This new genus seems to be rather closely related to Cretoquadratus , Eoractocetinus gen. nov., Eoractocetus gen. nov. and Paratractocerus differering from all of them in the subquadrate scutellum and metacoxal subcontiguous parts comprising about half of entire metacoxal length (last character is not applicable for Cretoquadratus ). Besides, it differs from:

— Cretoquadratus in the pronotum with more or less widely arcuate sides and widely rounded anterior and posterior angles;

— Eoractocetinus gen. nov. in the not compressed antennomeres, pronotum with more or less arcuate sides, metacoxae slightly obliquely declined to apices, abdominal ventrite 1 between metacoxal apices and its posterior edge shorter than each of ventrites 2–4;

— Eoractocetus gen. nov. in the longer postocular portion of epicranium, pronotum with more expressed tips of anterior angles and not projecting posterior ones, also with anterior edge not strongly anteriorly and not covered the head base, moderately long prosternum;

— Paratractocerus in the presence of palporgan.

Etymology. The name of this new genus is formed from the combination of the generic name Lymexylon and Greek “ ΟΨΙϚ ” meaning “resembling a (specified) thing”. Gender feminine.

Composition. In addition to the type species, the second congener is Raractocetus sverlilo Nazarenko, Perkovsky et Yamamoto in Yamamoto et al., 2022; Eocene Rovno amber; distinct from the type species at least in structure of prothorax, antennae and pubescence. Li et al. (2022) erroneously placed it into the genus Cretoquadratus (see above). The two considered species of the genus should get the following combination: Lymexylopsis baltica ( Yamamoto, 2019) , comb. nov. and Lymexylopsis sverlilo (Nazarenko, Perkovsky et Yamamoto, 2021) , comb. nov.