Archaeocerus uenoi Perreau, 2019

Perreau, Michel, 2019, Archaeocerus uenoi n. gen. n. sp. (Coleoptera Leiodidae Catopocerinae) from Albian / Cenomanian age amber of Myanmar, Zootaxa 4638 (4), pp. 595-600 : 596

publication ID

publication LSID


persistent identifier

treatment provided by


scientific name

Archaeocerus uenoi Perreau

n. sp.

Archaeocerus uenoi Perreau , n. sp.

Holotype presumably male: Myanmar, upper cretaceous amber deposit of the Hukawng valley , deposited in coll. M. Perreau.

Description. Length: 1.20 mm. Body elongate ( Figs. 1, 2 View FIGURES 1–3 ), flattened ( Fig. 3 View FIGURES 1–3 ), dark brown, the antennae, legs and mouthparts light brown.

Head without occipital carina. Antennal insertions concealed in dorsal view. Antennae with 11 antennomeres, the 8th significantly narrower than the 7th and the 9 th; the 7th, 9th and 10th without teeth ( Fig. 5 View FIGURES 4–8 ). Gular sutures widely distant. The observation of the presence or absence of a stem on the epistomal suture is not possible on the studied specimen.

Pronotum transverse, approximately 1.4 times as wide as long, widest very close to the base, with sides regularly arcuate and convergent anteriorly ( Fig. 1 View FIGURES 1–3 ). Surface shiny, with tiny punctures and a fine microreticulation, without transverse strigae, but with a longitudinal median impression ( Fig. 1 View FIGURES 1–3 ). Lateral margins with a distinct gutter ( Fig. 1 View FIGURES 1–3 ).

Elytra approximately 1.4 times as long as wide together, parallel in the two basal thirds of their length, then regularly rounded at apex. A single parasutural longitudinal stria. Punctures transversely aligned in oblique strigae and associated with short setae ( Fig. 1 View FIGURES 1–3 ). Surface shiny, with no visible microreticulation. Marginal gutter fairly wide ( Fig. 1 View FIGURES 1–3 ).

Flight wings present and probably functional, with nervation (veins) present near the base, reduced on the apical half, with numerous microtrichia and with ciliate margins, ( Figs. 7, 8 View FIGURES 4–8 ).

Ventral structures. Anterior part of the prosternal surface elongated in front of the procoxae ( Fig. 2 View FIGURES 1–3 ). Mesoventrum with a sharp and uninterrupted longitudinal median carina, the metaventrum not carinate, but with a wide and deep medial depression ( Fig. 2 View FIGURES 1–3 ). Metaventrite and first abdominal ventrite without setose paired impressions (the white spots visible on the ventral surface on Fig. 2 View FIGURES 1–3 are air bubbles, not setose impressions, they do not contain setae). Metacoxae clearly separate.

Legs. Tarsal formula 5-4-4. Protarsi imperceptibly dilated, with tenent setae of two kinds on the ventral face: some very long and straight, the others shorter, curved and slightly dilated at the apex ( Fig. 6 View FIGURES 4–8 ). Mesotarsi and metatarsi undilated ( Fig. 4 View FIGURES 4–8 ) and without tenent setae. Last protarsomere as long as the four preceding ones taken together, last meso and metatarsomeres as long as the three preceding ones taken together. Protibiae thickened in the basal half, then bearing an area lined with a dense bunch of setae on the inner margin of the apical half, in some way similar to the protibial antenna cleaner of the some Carabidae ( Fig. 6 View FIGURES 4–8 ). Outer side of protibiae spineless, outer side of meso and metatibiae with strong spines ( Fig. 4 View FIGURES 4–8 ).

Etymology. The name of the genus is built from the greek "Arkhaĩos": old and "cerus" from the last part of the name of the subfamily (possibly from Greek, meaning “horn”, despite Motschulsky (1870) gave no information on the origins of his generic name and there is no "horn" structure suggesting such a root). The species is dedicated to Teruhisa Ueno who provided to us the specimen.