Burmochlus gen. nov., the first Cretaceous member of the Archaeochlus cluster (Diptera: Chironomidae: Podonominae)

Wojciech Giłka , Marta Zakrzewska , Eugenyi A. Makarchenko

Abstract

A fossil genus, Burmochlus gen. nov., with a species B. madmaxi sp. nov. (Diptera, Chironomidae, Podonominae) is described from mid-Cretaceous amber of northern Myanmar (~100 Ma). The adult male of the new species/genus displays an interesting wing structure with a trace of the vein R2+3 (or R3 alone), the character unique in the subfamily Podonominae. The wing squama with a process bearing a bunch of setae, the wing membrane covered with bi- or trifid spinulae-like microtrichia, the gonostylus with a collar-like ring and a pear-shaped distal part, the robust anal point and the extensive superior volsella are also characters defined as exclusive for Burmochlus. The antenna, thorax and several hypopygium structures found in male Burmochlus clearly resemble those known from Archaeochlus Brundin, here defined as the closest relative, as well as from Afrochlus Freeman and Austrochlus Cranston – both previously referenced to or derived from Archaeochlus, hence being postulated as close or sister taxa. In a view of several hypotheses on the time of divergence of the Podonominae and other related subfamilies, this is the oldest fossil record of a true Podonominae chironomid based on definition of male characters, and dated back to the “mid-Cretaceous”. Along with Furcobuchonomyia Baranov, Góral et Ross (Buchonomyiinae) and Myanmaro Giłka, Makarchenko, Pankowski et Zakrzewska (Orthocladiinae), Burmochlus is the third genus described from Burmese amber, and the first known Podonominae chironomid described from this deposit.
Author Wojciech Giłka (FB / DIZP)
Wojciech Giłka,,
- Department of Invertebrate Zoology and Parasitology
, Marta Zakrzewska (FB / DIZP)
Marta Zakrzewska,,
- Department of Invertebrate Zoology and Parasitology
, Eugenyi A. Makarchenko
Eugenyi A. Makarchenko,,
-
Journal seriesCretaceous Research, ISSN 0195-6671, e-ISSN 1095-998X, (N/A 70 pkt)
Issue year2020
Vol106
Pages1-8
Publication size in sheets0.5
Article number104261
Keywords in EnglishDiptera, Chironomidae, Podonominae, systematics, Mesozoic, Burmite, Myanmar
ASJC Classification1911 Palaeontology
DOIDOI:10.1016/j.cretres.2019.104261
Languageen angielski
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 28-01-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.183; WoS Impact Factor: 2018 = 2.12 (2) - 2018=2.167 (5)
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