Hukawngichthyurus ditaddeoi, Fanti & Müller, 2022

Fanti, Fabrizio & Müller, Patrick, 2022, Fossil Cantharidae from the Cretaceous Burmese (Kachin) amber of the Patrick Müller collection, and taxonomic information, Baltic Journal of Coleopterology 22 (2), pp. 331-380 : 342-343

Hukawngichthyurus ditaddeoi sp. nov.

( Fig. 6 )

Holotype. Probable female, adult specimen in a Burmese (Kachin) amber piece: Catalog number SNSB­BSPG 2021 XII 17 in the Bayerische Staatssammlung für Paläontologie und Geologie (ex Müller’s collection number: BUB 4326 ).

Type locality. Myanmar: Kachin state, Myitkyina District, Hukawng Valley.

Type horizon. Lowermost Cenomanian (98.79 ± 0.62 Ma), mid­Cretaceous.

Differential diagnosis. The relatively small body size, the pronotum irregular with a convex draft, and the last urites in a kind of “fish tail” make this new species belong to the genus Hukawngichthyurus . The new species is distinguishable from other Hukawngichthyurus by its longer pronotum and elytra.

Description. Adult, alate, robust. Probable female, for the wide abdomen. Entirely brown with darker elytra. Body length: 4.9 mm.

Head elongated, convex in the anterior part and almost flat posteriorly, slightly restricted behind the eyes, surface finely punctated. Eyes large and prominent, subelliptical, inserted laterally to the head. Rostrum elongated and robust. Mandibles falciform. Maxillary palps 4­ segmented, last palpomere securiform with rounded apex. Labial palps 3­ segmented, last palpomere stout and slightly securiform.Antennae 11­ segmented, short, filiform with the central antennomeres enlarged, reaching almost the half of elytra, insertion of the antennae close to the eyes and in their lower part; scape robust, elongated, club­shaped; antennomere II very short, moniliform­triangular; antennomere III moniliform­globular, slightly irregular; antennomeres IV– Velongated, robust; antennomeresVI–X filiform, less sturdier than previous ones; antennomere XI filiform, rounded at apex; all antennomeres with not erected and very short setae. Pronotum elongated, slightly narrower than head, anterior margin slightly undulated, posterior margin strongly undulated and slightly bordered, sides straight, surface irregular with a central convex draft. Scutellum triangular. Elytra wider than pronotum, parallel­sided, rounded at apex, rather elongated and revealing the last two abdominal segments, surface without punctation, equipped with few little and thin striae. Metathoracic wings transparent, folded, very long, surpassing the elytra and the last tergites. Metasternum large, stout, sub­quadrate; sternites wide, transverse. Last urite with two asymmetrical apical lobes in a kind of fish tail, one of which is curved and very long with the base slightly enlarged and the center thinner and newly enlarged at apex, while the other one is very short and sturdier. Legs robust, long, with pubescence; coxae elongated and robust; trochanters slightly elongated, globular­shaped with apex rounded; femora robust and slightly curved, sturdier and longer than tibiae; tibiae cylindrical, thin, without spurs at apex. Tarsal formula 5­ 5­ 5; first tarsomere elongated, about 1.2 times longer than second; second tarsomere thin at base and enlarged apically; third tarsomere triangular and shorter than second; fourth tarsomere bilobed with the lobes very long and wide; fifth tarsomere elongated with wider sides; claws simple without denticles or lobes.

Etymology. Named in honor of Vincenzo Di Taddeo (Avigliana, Italy), dear friend of the first author.

Syninclusions. Air bubbles (few), detritus (many botanical remains).

Remarks. Piece of clear amber that measures 13x12x 3 mm. The inclusion is complete except for the missing right metathoracic leg. Furthermore, the right antenna is preserved until the eighth antennomere.

Figures

Fig. 6. Hukawngichthyurus ditaddeoi sp. nov. in Burmese amber. A: Holotype, ventro­lateral view; B: Holotype, dorso­lateral view.