Sanaungulus myanmaricus, 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 : 358-359

Sanaungulus myanmaricus sp. nov.

( Fig. 15 )

Holotype. Probable male, adult specimen in a Burmese (Kachin) amber piece: Catalog number SNHM­ 6009 in the Staatliches Naturhistorisches Museum Braunschweig (ex Müller’s collection number: BUB4166 ).

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

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

Differential diagnosis. Sanaungulus myanmaricus sp. nov. is characterized by a very elongated pronotum with the surface slightly undulate, a feature present only in Sanaungulus nilsi sp. nov. and Sanaungulus kachinensis sp. nov. S. nilsi has a pronotum more concave in the middle and more bordered at the margins (especially at the posterior margin), while S. kachinensis has a pronotum that is shorter and with a transversal incision.

Description. Adult, winged, slender. Probable male, defined on the basis of slender abdomen and long antennae. Body length 3.2 mm. Entirely brown.

Head transverse, constricted (triangular­shaped) behind the eyes, equipped with pubescence and punctation. Eyes prominent, large, roundish, inserted in the upper and lateral part of the head. Mandibles elongated, falciform. Maxillary palps 4­ segmented with the last palpomere securiform. Labial palps 3­ segmented, with the last palpomere elongated and strongly securiform.Antennae 11­ segmented, pectinate, surpassing half of elytra and reaching half of abdomen, antennal insertion in the eyes proximity; scape slender, elongated, slightly enlarged apically; antennomere II short, swollen apically; antennomere III elongated, filiform, about 1.8 times longer than second; antennomere IV longer and stouter than previous one; antennomeres V–IX extremely long, each equipped near the base with a long antennal process which is very long and rounded apically; antennomere X shorter than previous ones, equipped with an antennal process shorter than others and slightly squadrate at the base; antennomere XI short and robust, with rounded apex; all the antennomeres pubescent. Pronotum very elongated, narrower than head, anterior margin undulate, posterior margin extend backward in the middle and slightly bordered, sides straight and bordered, corners obtuse, pronotum disc irregular with small concavity and drafts. Scutellum triangular­shaped. Elytra short which reveals various abdominal segments, at humeri wider than pronotum, posteriorly parallel­sided and slightly dehiscent apically, rounded apexes, surface pubescent. Metathoracic wings transparent, slightly longer than elytra. Sternum elongated, sternites transverse, last abdominal segment wide and with rounded apex. Legs thin, extremely long, pubescent; coxae massive; trochanters elongated, with rounded apex; femora almost straight, cylindrical, slightly sturdier than tibiae; tibiae, thin, cylindrical, extremely long, with a spur near the apex, pro­ and mesotibiae shorter than pro­ and mesofemora, metatibiae as long as metafemora. Tarsal formula 5­ 5­ 5; first tarsomere long, about 2.0 times longer than second; third tarsomere short, triangular­shaped; fourth strongly bilobed; fifth tarsomere extremely elongated, thin, flat and curved; claws simple, long, pointed, without denticle at the base.

Etymology. Derived from the toponym Myanmar (nation where the amber mines are located).

Syninclusions. Air bubbles, detritus, stellate hairs, an unidentified insect.

Remarks. Piece of clear, golden amber that measures 18x11x 4 mm. The inclusion is complete but well visible only laterally (one side).

Figures

Fig. 15. Sanaungulus myanmaricus sp. nov. in Burmese amber. Holotype, lateral view.