Polycentropodidae Ulmer, 1903
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publication ID |
https://doi.org/ 10.15298/rusentj.31.2.13 |
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persistent identifier |
https://treatment.plazi.org/id/03E087C0-FFA4-7775-FCC5-FADC929979C8 |
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treatment provided by |
Felipe |
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scientific name |
Polycentropodidae Ulmer, 1903 |
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Family Polycentropodidae Ulmer, 1903 View in CoL Genus Archaeopolycentra
Botosaneanu et Wichard 1983
Archaeopolycentra longesilentia
Melnitsky et Ivanov, sp.n.
Figs 2 – 4 View Figs 2–3 View Fig .
MATERIAL. Holotype: ♂. PIN 3426 View Materials /223. Russia, Krasnoyarskiy Krai , Western Taymyr , right bank of the Nizhnyaya Agapa river , Taymyr amber, Dolgan formation, Cenomanian. The whole body with male genitalia, parts of legs and head; wings are poorly preserved.
DESCRIPTION. Body length 3.3 mm. Legs, head and its appendages yellowish. Thorax and abdomen brown. The head with long light hairs. Eyes large. The third segment of labial palp long, more than twice as long as any previous segment. This segment has numerous long thick-walled gustatory trichoid sensilla. Similar sensilla are present in lesser numbers also on the last (5th) segment of maxillary palps. The second segment of the maxillary palps has numerous strong setae. Medial warts of pronotum elongated.
Male genitalia. Projections of the segment X shorter than aedeagus, with two flat blades and a long spike between them at the apex. Four strong setae are visible on a thin flat blade of right projection of the segment X. Inferior appendages are long with strongly curved and expanded apex and a few short setae along ventral margin and on
COMPARISON. The new species differs from other species of the genus Archaeopolycentra in the shape of inferior appendages and projections of the segment X. The inferior appendages of the new species are not divided into two branches, with an expanded apex. Projections of the segment X have two lobes and one spine at the apex contrary to other species of the genus having smaller curved apical structures.
REMARKS. Aedeagus and processes of aedeagus shifted to the right because of overall deformation of the specimen. We include this new species into the genus Archaeopolycentra because of similarity of male genital structures to other species of this genus. Other findings might clarify its taxonomic position by characters of the wing venation. Previously, the authors noted that numerous thick-walled gustatory trichoid sensilla are often found on the terminal segments of the maxillary and labial palps in Trichoptera [Ivanov et. al., 2018]. These sensilla are rarely visible on fossils. These structures in Archaeopolycentra longesilentia sp.n. provide a basis for further comparative studies of extant and fossil species to investigate the evolution of sensilla.
internal surface. Subdivision on gonocoxite and gonostyle is not clearly visible; it is not unlikely that the damaged right gonopod (inferior appendage) was broken along the faint hinge of the two parts of inferior appendages. Aedeagus sclerotized, elongate with several small processes at apex. There are two black sclerotized fragments below the aedeagus.
ETYMOLOGY. From Latin longe (far) and silentium (silence).
Acknowledgements. This work has been supported by the grants the Russian Science Foundation, RSF № 22-24- 00259. We are grateful to colleagues in the Paleontological Institute of Russian Academy of Sciences (Moscow) for amber collecting and the treatment of amber.
Competing interests. The authors declare no competing interests.
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