Dr. Hiroyuki Yoshitomi lady beetle (Yassibum yoshitomii) from mid-Cretaceous Kachin amber

NEWS - Coccinelloid beetles have a rare fossil record from the Mesozoic, but researchers describe and illustrate an unusual fossil, Yassibum yoshitomii, from mid-Cretaceous Kachin amber. The new genus and species stand out within the Coccinelloidea because of the notched prophemorea and the presence of antennal grooves on the elytral epipleura.

Yassibum is characterized by an oval body, 10-segmented antennae, with a 3-segmented club. Labrum with a strongly emarginate apex. Pronotal disc with a narrow and deep basolateral sulcus. Procoxa prominent.

Elytral epipleura broad at base, basally with antennal grooves extending posterolaterally. Mesocoxa cavity broadly closed laterally. Mesoventrite and metaventrite without opening near anterior margin. Metanepisterna hidden. Profemora with prominent incisions on outer side. Tarsi simple, 4-4-4.

The species name is gender-neutral. The species is named after coleopterist Dr. Hiroyuki Yoshitomi. The main characteristics are an oval body, slightly convex dorsal side, about 1.3 mm long, 0.9 mm wide and a slightly silty surface.

Original research

Li Y, Tomaszewska W, Arriaga-Varela E, Huang D, Cai C. 2024. An unusual Cretaceous beetle with affinity to Anamorphidae (Coleoptera: Coccinelloidea). PeerJ 12:e18008, DOI:10.7717/peerj.18008

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