Pseudodrobna Natator N. Comb., a New Link Between Crustacean Faunas from the Jurassic of Germany and Cretaceous of Lebanon
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Geodiversitas 43 (8): 209-218. https://doi.org/10.5252/geodiversitas2021v43a8. http://geodiversitas.com/43/8 ABSTRACT Dendrobranchiate shrimps are abundant in Fossil-Lagerstätten (where fossils are exceptionally pre- served). Despite their preservation, classifying them can be challenging as most diagnostic characters are based upon extant species. Penaeus natator Glaessner, 1945 (Late Cretaceous, Lebanon, Sahel Alma), is one of those cases in which the systematic assignment of the species can be difficult. It was assigned by “default” to Penaeus Fabricius, 1798, before being moved to Metapenaeopsis Bouvier, 1905. The recent description of Pseudodrobna kenngotti Winkler, 2017 (Late Jurassic, Germany, Schernfeld, KEY WORDS a Solnhofen-type Fossil-Lagerstätte) shows that Penaeus natator should be assigned to Pseudodrobna Decapoda, Winkler, 2017. This attests once again the similarity in composition of crustacean faunas between Late Dendrobranchiata, Fossil-Lagerstätten, Jurassic Solnhofen-type Fossil-Lagerstätten and the Late Cretaceous Fossil-Lagerstätten of Lebanon. Tithonian, We also discuss the palaeoecological significance of bilobed eyes, which occur in three species from Santonian, the Late Cretaceous of Sahel Alma: Pseudodrobna natator n. comb., Palaeobenthonectes arambourgi palaeobiology, bilobed eyes, (Roger, 1946) and Palaeobenthesicymus libanensis (Brocchi, 1875). These eyes seem to have evolved new combination. convergently due to the deep-water and dim-light palaeoenvironment of these three shrimp species. GEODIVERSITAS • 2021 • 43 (8) © Publications scientifiques du Muséum national d’Histoire naturelle, Paris. www.geodiversitas.com 209 Audo D. et al. RÉSUMÉ Pseudodrobna natator n. comb., un nouveau point commun entre les faunes de crustacés du Jurassique d’Allemagne et du Crétacé du Liban. Les crevettes dendrobranchiates sont abondantes dans les gisements à conservation exceptionnelle. Malgré leur préservation, les classer reste difficile car la plupart des caractères diagnostiques de ce groupe ont été définis sur des espèces actuelles. Penaeus natator Glaessner, 1945 est l’un de ces cas difficiles. Cette espèce a été assignée «par défaut » à Penaeus Fabricius, 1798, avant d’être assignée à Metapenaeopsis Bouvier, 1905. La description de Pseudodrobna kenngotti Winkler, 2017 (Jurassique supérieur, Allemagne, Schernfeld, un gisement à conservation exceptionnelle de type Solnhofen) suggère MOTS CLÉS que Penaeus natator pourrait être assignée à Pseudodrobna Winkler, 2017. C’est un point commun de Decapoda, plus entre les faunes de crustacés du Jurassique supérieur des gisements de type Solnhofen et ceux du Dendrobranchiata, Fossil-Lagerstätten, Crétacé supérieur du Liban. Nous abordons ici également l’intérêt paléoécologique de la découverte Tithonien, d’yeux bilobés, présents chez trois espèces du Crétacé supérieur de Sahel Alma : Pseudodrobna natator Santonien, n. comb., Palaeobenthonectes arambourgi (Roger, 1946) et Palaeobenthesicymus libanensis (Brocchi, paléobiologie, yeux bilobés, 1875). Ces yeux semblent être le produit d’une convergence évolutive liée au milieu de vie profond combinaison nouvelle. et peu lumineux de ces trois espèces de crevettes. INTRODUCTION Brandenburg, Germany) and Roger Frattigiani private collec- tion (Laichingen, Baden-Württemberg, Germany). Dendrobranchiate shrimps are a major group in modern Specimens were documented with various photographic marine and brackish-water environments, where they are often techniques allowing an increase in contrast and revealing abundant and can be ecologically (Tavares & Martin 2010) details difficult to see with naked eye: cross-polarized macro- and economically important (Pérez Farfante & Kensley 1997). photography (specimens from MNHN; see Bengtson 2000 – In the fossil record, they are generally rare, except in outcrops see Fig. 1D), UV-yellow autofluorescence macrophotography with exceptional preservation (Fossil-Lagerstätten) where they (specimens from Schernfeld – figured – and MNHN – not can readily preserve. Such are the cases of the Late Jurassic figured, with a faint autofluorescence; seeHaug et al. 2011, Solnhofen-type outcrops of Germany (e.g., Solnhofen, Eichstätt, Tischlinger 2015 and Charbonnier et al. 2017 – see Fig. 1I-J) Zandt, Nusplingen, Wattendorf: Winkler 2012, Schweigert et and simple macrophotography in diffuse light (all specimens, al. 2016) and Late Cretaceous Fossil-Lagerstätten of Lebanon only this technique in the case of NHMUK specimens). (Hadjoula, Hakel, En Nammoura, Sahel Alma: Garassino 1994, Charbonnier et al. 2017). Despite being separated by over 50 million years and being placed on either side of the SYSTEMATIC PALAEONTOLOGY Tethys Ocean, these Lagerstätten have some similarities in their crustacean faunas (Garassino 1994, Charbonnier et al. 2017). EUCARIDA Calman, 1904 The present research reinvestigates Penaeus natator Glaess- DECAPODA Latreille, 1802 ner, 1945 (Figs 1A-H; 2A) from the Santonian of Sahel Alma DENDROBRANCHIATA Bate, 1888 (Lebanon), comparing it to Pseudodrobna kenngotti Winkler, Superfamily PENAEOIDEA Rafinesque, 1815 2017 (Fig. 1I-J) from the Tithonian of Schernfeld (Germany), Family PENAEIDAE Rafinesque, 1815 and highlighting the phylogenetic affinities of both species Genus Pseudodrobna Winkler, 2017 and their implications. TYPE SPECIES. — Pseudodrobna kenngotti Winkler, 2017, by monotypy. INCLUDED SPECIES. — Pseudodrobna kenngotti, Pseudodrobna natator MATERIAL AND METHODS (Glaessner, 1945) n. comb. This study is based upon a total of 16 specimens: nine speci- mens of Penaeus natator Glaessner, 1945; four specimens of Pseudodrobna natator