Eur. J. Entomol. 101 (1): 145-151, 2004 | DOI: 10.14411/eje.2004.019
A new Upper Cretaceous species of Chresmoda from Lebanon - a latest representative of Chresmodidae (Insecta: Polyneoptera inc. sed.): first record of homeotic mutations in the fossil record of insects
- 1 Laboratoire d'Entomologie and CNRS UMR 8569, Muséum National d'Histoire Naturelle, 45 Rue Buffon, F-75005 Paris, France; e-mail: anel@mnhn.fr
- 2 Lebanese University, Faculty of Science II, , Biology Department, Fanar - Matn - B.P. 26110217, and Saint-Joseph University, Campus of Sciences and Technology, Mar Roukos (Mkalles), B.P. 11-1514 Beirut, Lebanon; e-mail: azar@mnhn.fr
- 3 Departament d'Estratigrafia, Paleontologia i Geociencies Marines, Facultat de Geologia, Universitat de Barcelona, E-08071, Barcelona, Spain; e-mail: xdelclos@geo.ub.es
- 4 Saint-Joseph University, B.P 165507, Beyrouth, Lebanon; e-mail: maked@cyberia.net.lb
The most recent representative of the semi-aquatic insect family Chresmodidae is described from the Lebanese Cenomanian marine lithographic limestone. Its highly specialized legs, with a high number of tarsomeres, never observed in other orders of insects, were probably adapted for water surface skating. We hypothesize the occurrence of a unique, extraordinary "antenna" mutation affecting the distal part of the legs of the Chresmodidae, maybe homeotic or affecting some genes that participate in the leg development and segmentation. The Chresmodidae had a serrate ovipositor adapted to endophytic egg laying in floating or aquatic plants. They were probably predaceous on nektonic small animals. As the Chresmodidae and the aquatic water skaters of the bug families Veliidae and Gerridae were contemporaneous during at least the Lower Cretaceous, these insects probably did not cause the extinction of this curious group.
Keywords: Insecta, Polyneoptera, Chresmodidae, Cenomanian, Lebanon, systematic palaeontology, Palaeoecology, leg morphology, pleustonic life
Received: March 28, 2003; Revised: July 25, 2003; Accepted: October 8, 2003; Published: March 25, 2004 Show citation
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