New Cretaceous records and the diversification of crown-group ants (Hymenoptera: Formicidae)

Abstract : The knowledge on Cretaceous ants has significantly improved within the last decade, thanks to increasing discoveries from insect- rich amber deposits. Yet, the vast majority of fossils found preserved in Cretaceous deposits belongs to extinct, stem-group ants such as the Sphecomyrminae and Brownimeciinae. To date, only nine species in eight genera have been attributed to crown-group ants. Among these, however, Burmomyrma rossi Dlussky, 1996 should be excluded from Formicidae and transferred to Falsiformicidae (Chrysidoidea). Also, the placement of three species from Campanian Canadian amber is still debatable: Canapone dentata Dlussky, 1999, originally placed in Ponerinae and later transferred to Ectatomminae; Eotapinoma macalpini Dlussky, 1999 in Dolichoderinae; and Cananeuretus occidentalis Engel & Grimaldi, 2005 in Aneuretinae. The three species were each based on a unique specimen that was only partial or partly visible, two of which have been lost, and their precise affinity remains enigmatic. Similarly, imprint fossils from the Turonian of Botswana, that were tentatively placed in Ponerinae (Afropone oculata and A. orapa Dlussky, Brothers & Rasnitsyn, 2004) and Myrmicinae (Afromyrma petrosa Dlussky, Brothers & Rasnitsyn, 2004), were based on poorly preserved specimens and assignment to these subfamilies has been questioned. Finally, only two of the nine described species are definitely assignable to extant subfamilies: Kyromyrma neffi Grimaldi & Agosti, 2000, a Formicinae from Turonian Raritan amber; and Chronomyrmex medicinehatensis McKellar, Glasier & Engel, 2013, a Dolichoderinae from Canadian amber. Here I present six new morphotypes from Burmese amber that are assignable to crown ants: a Ponerinae, a Formicinae, and a Dolichoderinae in early Cenomanian amber from Northern Myanmar (‘Kachin amber’); and a Ponerine and two Dolichoderinae in late Campanian amber from Central Myanmar (‘Tilin amber’). These records greatly expand the known diversity of Cretaceous crown ants, and shed a new light on the origin and early diversification of extant ant subfamilies prior to their great Cenozoic expansion. (PDF) New Cretaceous records and the diversification of crown-group ants (Hymenoptera: Formicidae). Available from: https://www.researchgate.net/publication/332622719_New_Cretaceous_records_and_the_diversification_of_crown-group_ants_Hymenoptera_Formicidae [accessed May 21 2019].
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Conference papers
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Submitted on : Tuesday, May 21, 2019 - 2:57:51 PM
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Vincent Perrichot. New Cretaceous records and the diversification of crown-group ants (Hymenoptera: Formicidae). 8th International Congress on Fossil Insects, Arthropods & Amber, Apr 2019, Saint Domingue, Dominica. ⟨insu-02135667⟩

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