Difference between revisions of "Omma forte"
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Ordo: Coleoptera
Familia: Ommatidae
Genus: Omma
Name
Omma forte Li & Cai sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Material examined
Holotype, NIGP176634.
Etymology
The specific name is from the Latin ‘fortis’, meaning strong, referring to the robust appearance of the species.
Locality and horizon
Amber mine located near Noije Bum Village, Tanai Township, Myitkyina District, Kachin State, Myanmar; unnamed horizon, mid-Cretaceous, Upper Albian to Lower Cenomanian.
Description
Body comparatively wide, about 9.3 mm long and 3.8 mm wide, tuberculate, with thin setae and scales.
Head (Fig. 3A, C) prognathous, seemingly wider than long. Neck region constricted, broad. Compound eyes comparatively large, protuberant. Antennal insertions located at anterior corners of head, separated by more than three diameters of antennomere 1. Subantennal grooves absent. Frontoclypeal suture absent. Labrum (Fig. 4A) transverse, with dentate anterior margin. Antenna (Fig. 3A) long, extending beyond base of prothorax when posteriorly directed, 11-segmented and filiform. Mandibles (Fig. 4B) tridentate with vertically aligned teeth. Maxillary and labial palps short, not reaching the level of the eyes when extending posteriorly (Figs 3C, 4C); apical maxillary and labial palpomeres probably expanded and securiform. Pronotal disc (Fig. 3B) widest in the anterior third, slight narrowing posteriorly; anterior corners rounded; lateral edges with distinct tooth-like tubercles (dentate) (Fig. 4D). Scutellar shield (Fig. 4E) subtrapozoidal, wider posteriorly. Elytra (Figs 2, 3E, F) with ten rows of window punctures; lateral edges with distinct tooth-like tubercles (dentate); surface with ribbed slender scales (Fig. 4G); punctures in the ninth row distinctly transverse; interspace between eighth and ninth puncture rows thickened (Fig. 2). Metaventrite narrowed anteriorly; discrimen present; metakatepisternal suture well developed (Fig. 4H). Metacoxae (Fig. 4H) strongly transverse with subconical mesal projections, contiguous, extending laterally to meet elytra, with weak coxal plates.
Hind wings (Fig. 3G, H) well developed. CuA forked; CuA1 fused with MP3+4; CuA3+4 fused with CuP+AA3; wedge cell present.
Legs long and slender. Tibiae with at least one well-developed spur. Tarsi long and slender; metatarsus especially long; metatarsomere 1 about as long as metatibia (Fig. 3D). Pretarsal claws simple.
Abdomen with five coplanar ventrites, separated by distinct grooves (Fig. 4I).
Remarks
The new species can be confidently assigned to Omma. The length of maxillary and labial palps is a key diagnostic character separating Beutelius from Omma (Escalona et al. 2020[1]). Omma forte sp. nov. has short maxillary and labial palps, not reaching the level of the eyes, which is in accordance with Omma. The hind wing venation (especially the branching pattern of CuA) is another important character differentiating the two genera. In most beetle fossils preserved in amber, the hind wings are hidden by the elytra, and are thus not available for taxonomic purpose. Fortunately, the hind wings are partly exposed in the holotype of O. forte. In O. forte, the posterior branch of CuA (CuA3+4) is fused with CuP+AA3, closing the wedge cell, and the anterior branch of CuA (CuA1) is fused with MP3+4 (Fig. 3G), which matches perfectly with the venation of Omma stanleyi (fig. 64 in Escalona et al. 2020[1]; fig. 4B in Lawrence et al. 2021[2]), while the CuA of Beutelius is unforked (figs 67–68 in Escalona et al. 2020[1]) or with an incomplete anterior branch only (fig. 4A in Lawrence et al. 2021[2]).
Original Description
- Li, Y; Huang, D; Cai, C; 2021: New species of Omma Newman from mid-Cretaceous Burmese amber (Coleoptera, Archostemata, Ommatidae) Deutsche Entomologische Zeitschrift, 68(2): 341-348. doi
Images
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Other References
- ↑ 1.0 1.1 1.2 Escalona H, Lawrence J, Ślipiński A (2020) The extant species of the genus Omma Newman and description of Beutelius gen. nov. (Coleoptera: Archostemata: Ommatidae: Ommatinae).Zootaxa4728: 547–574. https://doi.org/10.11646/zootaxa.4728.4.11
- ↑ 2.0 2.1 Lawrence J, Zhou Y, Lemann C, Sinclair B, Ślipiński A (2021) The Hind Wing of Coleoptera (Insecta): Morphology nomenclature and phylogenetic significance. Part 1. General discussion and Archostemata–Elateroidea.Annales Zoologici71: 421–606. https://doi.org/10.3161/00034541ANZ2021.71.3.001
