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First fossil of Cylindrostethinae (Heteroptera: Gerromorpha: Gerridae) in the Paleocene of Menat, France

Viktor Hartung, Romain Garrouste, Jean-Marc Pouillon, and André Nel

Plain Language Abstract

Even if they are rather frequent in the Cenozoic, the gerrids are not well known in the Mesozoic and the Paleocene. Here we describe the second oldest representative of this family of water bugs and the first fossil record of the small modern subfamily Cylindrostethinae. This group is living under warm environments, confirming similar paleoclimate for the ancient lake of Menat (Centre of France).

Resumen en Español

Primer fósil conocido de Cylindrostethinae (Heteroptera: Gerromorpha: Gerridae) en el Paleoceno de Menat, Francia

Se describe Cylindrostethus gaudanti sp. nov., el primer representante fósil de la subfamilia de gérridos Cylindrostethinae, hallado en el Paleoceno de Menat (centro de Francia). Muestra una apariencia morfológica muy moderna, y sus caracteres están lo suficientemente bien conservados como para permitir la identificación específica dentro del género Cylindrostethus. Su presencia en el Paleógeno de Europa sugiere que esta subfamilia es muy antigua, de acuerdo con su distribución disruptiva actual en los trópicos. Los Cylindrostethinae actuales están restringidos a los bosques lluviosos tropicales, en concordancia con el paleoambiente deducido para el antiguo lago Menat que sería similar. Se describe para la nueva especie un posible rasgo de dimorfismo sexual en la longitud de los fémures anteriores.

Palabras clave: Insecta, gérrido, nueva especie, primer registro fósil

Traducción: Enrique Peñalver (Sociedad Española de Paleontología)

Résumé en Français

Premier fossile connu de Cylindrostethinae (Heteroptera: Gerromorpha: Gerridae) dans le Paléocène de Menat, France

Nous décrivons Cylindrostethus gaudanti sp. nov., premier représentant fossile de la sous-famille de Gerridae Cylindrostethinae, découvert dans le Paléocène de Menat (centre de la France). Il présente une apparence morphologique très moderne, ses caractères étant suffisamment bien conservés pour permettre une attribution dans le genre Cylindrostethus. Sa présence dans le Paléogène d'Europe suggère que cette sous-famille est très ancienne, en accord avec sa distribution disruptive dans la zone intertropicale moderne. Les Cylindrostethinae actuels se rencontrent dans les forêts alluviales tropicales, ce qui concorde avec le paléomilieu déduit pour l'ancien lac de Menat. Nous décrivons pour la nouvelle espèce un dimorphisme sexuel possible dans la longueur des fémurs antérieurs.

Mots-clés : Insecta; punaise d'eau, nouvelle espèce, premier fossile connu

Translator: Authors

Deutsche Zusammenfassung

Der erste fossile Nachweis der Cylindrostethinae (Heteroptera: Gerromorpha: Gerridae) aus dem Paläozän von Menat, Frankreich

Cylindrostethus gaudanti sp. nov., der erste fossile Vertreter der Gerridae-Unterfamilie Cylindrostethinae, wird beschrieben aus dem Paläozän von Menat (Zentralfrankreich). Der Habitus ist sehr modern und Merkmale sind gut erhalten, sodass die neue Art der Gattung Cylindrostethus zugeordnet werden kann. Das Vorkommen im Paläogen von Europa legt hohes Alter der Unterfamilie nahe, was gut zu ihrer modernen disjunkten tropikopolitischen Verbreitung passt. Moderne Cylindrostethinae sind auf tropische Regenwälder beschränkt, im Einklang mit ähnlicher Paläoumwelt in dem See von Menat. Variable Länge der Vorderfemora wird beschrieben als wahrscheinliches sexual dimorphes Merkmal der neuen Art.
Schlüsselwörter: Insecta; Wasserläufer; neue Art; erster fossiler Nachweis

Translator: Author

Arabic

Translator: Ashraf M.T. Elewa

 

 

hartungViktor Hartung. Staatliches Museum für Naturkunde Karslruhe, Erbprinzenstrasse 13; D-76133 Karlsruhe, Germany. This email address is being protected from spambots. You need JavaScript enabled to view it.

Viktor Hartung, born 19.05.1980 in Taganrog, Russian Federation; studied biology at the Southern Federal University (Rostov-on-Don, Russian federation) and Humboldt University (Berlin, Germany) with focus on zoology, genetics and paleontology. At the moment completing the PhD in biology at the Humboldt University and working as a trainee at the Natural History Museum in Karlsruhe, Germany.

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garrousteRomain Garrouste. Institut de Systématique, Évolution, Biodiversité, ISYEB - UMR 7205 - CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France. This email address is being protected from spambots. You need JavaScript enabled to view it.

Romain Garrouste. Dr. at the MNHN, Paris. Evolutionary biologist, ecologist and taxonomist, RG is entomologist and palaeoentomologist, involved in several research programs including biodiversity exploration and fossil prospecting in France, Arctic (Svalbard), Neotropics (mainly French Guyana), Madagascar, Pacific (Clipperton and New-Caledonia, Australia), inventor and co-inventor of new fossil outcrops in France, Svalbard, Madagascar and New-Caledonia, and science imaging expert.

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pouillonJean-Marc Pouillon. 179 rue des Plattieres, F-38300 Nivolas Vermelle, France. This email address is being protected from spambots. You need JavaScript enabled to view it.

Jean-Marc Pouillon, Geologist(Nancy /France, President of Rhinopolis Association. 13 years Prospector for COGEMA for research of uranium deposit under sedimentary cover in Morvan area and in Permian South of France (Detroit of Rodez Permian basin). 2 years like Director technic for an Granit Company in Corrèze. 2 years like Responsible for extraction of feldspathic sandstone for glass industry for Harwane group. Sales manager for an international Diamant tools company from 23 years.

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nelAndré Nel. Institut de Systématique, Évolution, Biodiversité, ISYEB - UMR 7205 - CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France. This email address is being protected from spambots. You need JavaScript enabled to view it. Corresponding author

André Nel, Dr, Pr. At the MNHN, Paris. Specialist in fossil insects. Ca. 550 publications since 1983.

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FIGURE 1. Habitus (1), left fore tarsus (2), and right fore tarsus (3) of Cylindrostethus gaudanti sp. nov. holotype,

MNHN.F.A53794 (male). Arrows indicate tarsomeres. Scale bars equal 10 mm (1) and 1 mm (2, 3).

figure1

FIGURE 2. Habitus (1) and apex of abdomen (2) of Cylindrostethus gaudanti sp. nov. Allotype, MNHN.F.A53795 (female). Scale bars equal 10 mm (1) and 0.5 mm (2).

figure2

FIGURE 3. Head with rostrum (arrow) and antennae (1) and thorax (arrow: pronotum) (2) of Cylindrostethus gaudanti sp. nov. 1, MNHN.F.A53798 (paratype) and 2, MNHN.F.A53800 (paratype). Scale bars equal 2 mm.

figure3

FIGURE 4. Apex of mid tibia (arrow) (1) and male terminalia (2) of Cylindrostethus gaudanti sp. nov. 1, MNHN.F.A53795 (allotype, female); and 2, MNHN.F.A53799 (paratype, male). Scale bars equal 1 mm (1) and 0.5 mm (2).

figure4

FIGURE 5. Thoraxes of Cylindrostethus gaudanti sp. nov. 1, MNHN.F.A53797 (paratype); and 2, MNHN.F.A53798 (paratype). Abbreviations: is, primary intersegmental suture between meso- and metathorax; TIII, metathorax. Scale bars equal 2 mm.

figure5

FIGURE 6. Reconstruction of Cylindrostethus gaudanti sp. nov. 1, body of MNT-06-880B (paratype); and 2, thorax of MNHN.F.A53797 (paratype). Abbreviations: is, primary intersegmental suture; pn, mesopostnodal margin; TI, pronota; TII, mesonota; TIII, metanota. Scale bars equal 5 mm (1) and 2 mm (2).

 

 

TABLE 1. Measurements (in mm) of the specimens examined in this study. Blank cells show lacking body parts. In paired extremities, if both counterparts were present, still only the best preserved one of them was measured. Except for the body length, indicated dimensions correspond to the lengths.

Specimen Body length Body width 1st antennal segment length Fore femur length Fore tibia length Fore tarsus length Middle femur length Middle tibia length Hind femur length Hind tibia length Genitali
length
Male                      
A53794 14.5 2.5   5.0 4.4 1.1 13.3 9.7 8.0   ca. 0.9
A53799 15.7 3.3   5.0     12.7   11.7    
A53796 15.0 3.2 6.0 5.0 4.7   15.4        
A53800 18.0 3.2 5.0 5.2 5.1   12.4   10.3 11.0  
Female                      
A53795 17.0 3.4   4.0 4.5 1.0 12.8 11.0 12.0 11.0 1.3
A53798 16.0 2.7 4.6 4.5 5.3   11.0   12.8   1.5
A53797 15.8 3.1                 1.1