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Zookeys. 2019 Dec 10;898:1-26. doi: 10.3897/zookeys.898.47118. eCollection 2019.

Revision of fossil Metretopodidae (Insecta, Ephemeroptera) in Baltic amber - Part 4: Description of two new species of Siphloplecton Clemens, 1915, with notes on the new S. jaegeri species group and with key to fossil male adults of Siphloplecton.

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Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branišovská 31, 37005 České Budějovice, Czech Republic Biology Centre of the Czech Academy of Sciences České Budějovice Czech Republic.
Department of Invertebrate Zoology and Hydrobiology, University of Łódź, Banacha 12/16, 90237, Łódź, Poland University of Łódź Łódź Poland.
Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, 10115, Berlin, Germany Museum für Naturkunde Berlin Germany.
Department of Entomology, Stuttgart State Museum of Natural History, Rosenstein 1, 70191, Stuttgart, Germany Stuttgart State Museum of Natural History Stuttgart Germany.


The Siphloplecton jaegeri species group is established here for three extinct species, namely for the earlier described Siphloplecton jaegeri Demoulin, 1968, and for two new species from Eocene Baltic amber, Siphloplecton landolti sp. nov. and Siphloplecton studemannae sp. nov. Based on the well-preserved specimens of these species, a diagnosis is provided for the newly established species group. Representatives of the S. jaegeri species group are characterized by the presence of large, medially contiguous eyes, stout pointed setae along the outer margin of the foretibia, three intercalaries in the cubital field of the forewing, and elongated penis lobes, which are apically triangular or rounded, medially contiguous, and with a V-shaped cleft apically. Further new specimens of the S. jaegeri species group are documented that cannot be attributed to species level due to their poor preservation. Finally, a key to male adults of fossil species of Siphloplecton is given.


Siphlonuroidea ; Eocene; Fossil insects; mayflies; new species; species group

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