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A Chimera-Like Fossil Crustacean Interpreted As Decapoda, Stomatopoda, Amphipoda and Finally Isopoda Paula G. Pa

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A Chimera-Like Fossil Crustacean Interpreted As Decapoda, Stomatopoda, Amphipoda and Finally Isopoda Paula G. Pa Rivista Italiana di Paleontologia e Stratigrafia (Research in Paleontology and Stratigraphy) vol. 127(2): 211-229. July 2021 THE LONG TRAIL: A CHIMERA-LIKE FOSSIL CRUSTACEAN INTERPRETED AS DECAPODA, STOMATOPODA, AMPHIPODA AND FINALLY ISOPODA PAULA G. PAZINATO1,*, CAROLIN HAUG1,2, ROSEMARIE ROHN3, KAREN ADAMI- RODRIGUES4, RENATO PIRANI GHILARDI5, MAX CARDOSO LANGER6 & JOACHIM T. HAUG1,2 1*Corresponding author. Department Biologie II, LMU München, Biozentrum, Großhaderner Str. 2, 82152 Planegg-Martinsried, Germany. 2GeoBio-Center der LMU München, Richard-Wagner-Str. 10, 80333 München, Germany. 3Geosciences Institute, UNESP, Av. 24 A 1515, 13506-900, São Paulo, Brazil. 4UFPel, Praça Domingos Rodrigues 02, 96010-440 Pelotas, Brazil. 5Sciences Faculty, UNESP, Av. Eng. Luiz Edmundo Carrijo Coube 14-01, 17033360 Bauru, Brazil. 6FLCCL, USP, Av. Bandeirantes 3900, 14040901, Ribeirão Preto, Brazil. E-mail: [email protected]; [email protected]; [email protected]; [email protected]; ghi- [email protected]; [email protected]; [email protected] To cite this article: Pazinato P.G., Haug C., Rohn R., Adami-Rodrigues K., Pirani Ghilardi R., Cardoso Langer M. & Haug J.T. (2021) - The long trail: a chimera-like fossil crustacean interpreted as Decapoda, Stomatopoda, Amphipoda and finally Isopoda. Riv. It. Paleontol. Strat., 127(2): 211-229. Keywords: Peracarida; Isopoda; Permian; Paraná Basin; morphometric analysis; convergent evolution. Abstract. The process of interpreting and evaluating a fossil is a difficult task. Isopoda is a species-rich group of peracarid eumalacostracans which represent quite a challenge when found as fossils, independent of whether we are working with fragmentary or more complete specimens. Here we describe a new fossil species of crustacean, Platuropodus odysseus n. gen. n. sp., from the Irati Formation, Permian of Paraná Basin, Brazil. After misinterpreta- tions, the fossil taxon is recognised here as a representative of Isopoda. The new species presents characters found in Phreatoicidea, Asellota and Oniscidea in a unique combination for the fossil and extant record, such as two pairs of sub-chelate anterior trunk appendages, a short region after the anus and flat uropods. This chimera-like morphology and a morphometric analysis of the sub-chelae indicate convergent evolution in the early diversification of Isopoda. The morphological diversification present in the Palaeozoic and Mesozoic ossilf record of Eumalacostraca indicate a “push of the past” effect in different ingroups of Peracarida. INTRODUCTION Yet, fossils are still the best clues that we have to comprehend the history of life. Interpreting a fossil taxon is challenging, and In groups such as Euarthropoda (sensu Maas even harder is to make sense of them in the light & Waloszek 2001), which holds enormous morpho- of evolution. There are many famous cases of mis- logical and ecological diversity within animals, the interpretation of fossils in the history of science misinterpretation of a fossil can lead to the misinter- (Whittington & Briggs 1985; Davidson 2002; Starr pretation of how several lineages evolved. In such et al. 2016; Foth & Rauhut 2017, among others). circumstances, morphologically diverse ingroups Such cases affect and misguide our understanding (where an ingroup is a group of species whose of evolution and estimations on diversity in the past. monophyly is established or hypothesised) represent quite a challenge, especially when dealing with frag- mented specimens. Among crustaceans, malacostra- Received: November 17, 2020; accepted: February 18, 2021 cans, erroneously dubbed “higher crustaceans” (e.g., 212 Pazinato P.G., Haug C., Rohn R., Adami-Rodrigues K., Pirani Ghilardi R., Cardoso Langer M. & Haug J.T. Abzhanov & Kaufman 2000; Berezina & Petryas- and mountain lakes. They have limited swimming hev 2012; Štrus et al. 2019), have a rather rich fossil skills and preferably crawl on the substrate (Wilson record. Two groups, Isopoda and Amphipoda, are & Keable 2001). particularly species-rich and form-diverse, each in- Asellotans are small isopodans, in which the cluding about one fourth of all formally described pleon segments 3–6 are usually conjoined to the extant malacostracan species (Lowry & Myers 2017; telson. Also, pleopods are sexually dimorphic, spe- Boyko et al. 2020; Horton et al. 2020). cialized for mating. Most asellotans are marine, but Amphipoda includes aquatic mostly ben- some live in freshwater (Dreyer & Wägele 2002). thic species (Bellan-Santini 2015; Lowry & Myers Scutocoxifera includes all the remaining represent- 2017). Representatives of this group have a later- atives of Isopoda. In this group, the proximal ele- ally compressed body and are differentiated from ment (coxa) of the anterior seven trunk segments is other representatives of Eumalacostraca by a spe- largely immobilised. It is furthermore strongly flat- cialized pleon (posterior six segments of the body) tened (“coxal plates”), and so strongly continuous to (Bellan-Santini 2015). In most representatives of the body sclerites that it is often only recognisable as Eumalacostraca, the anterior five pleon segments a separate structure by a thin suture line apparent on carry appendages (pleopods) that are sub-similar, the tergite (Dreyer & Wägele 2002). whereas the appendages of segment six are differ- The fossil record of Isopoda includes late Pal- entiated and therefore received another name, uro- aeozoic representatives of Phreatoicidea and Scuto- pod (Kutschera et al. 2012). coxifera (Schädel et al. 2020), and Triassic Asellota In representatives of Amphipoda, the ap- (Selden et al. 2016). As for many groups of Euar- pendages of the anterior three segments differ- thropoda, fossils of Isopoda are often difficult to entiated from those of the posterior three. The recognize, as they frequently lack preserved distinct appendages of the posterior three segments are apomorphies. similar to one another and (unfortunately) also We present here a new fossil species from the termed uropods (Lowry & Myers 2013). The old- Permian (Cisuralian) of Brazil. The new fossil tax- est fossil record of Amphipoda is from the Low- on has a unique mixture of characters, so far un- er Cretaceous (Jarzembowski et al. 2020), but the known in any fossil or extant species, that are found group became more common from the Eocene in different ingroups of Eumalacostraca, particular- onwards (Coleman & Myers 2000; Jażdżewski & ly Phreatoicidea and, to some extent, Amphipoda, Kupryjanowicz 2010). characterising a chimera-type morphology, in the Isopoda includes aquatic and terrestrial spe- sense of the Greek mythical creature composed of cies, such as the commonly known “pill bugs”. Ex- body parts of other animals. We discuss the possible tant representatives of Isopoda comprise two dis- phylogenetic affinities of the new taxon, the pos - tinct sister groups, Phreatoicidea and its unnamed sible cases of morphological convergence, and the sister-group that includes Asellota and Scutocoxif- “push of the past” effect present in Isopoda. era. This arrangement is supported by morpholog- ic (Wägele 1989; Brusca & Wilson 1991) and mo- MATERIAL AND METHODS lecular phylogenies (Dreyer & Wägele 2002). Phreatoicidea is often considered to be the Examined material oldest lineage of Isopoda (Wilson & Keable 2001) The material presented here is housed at the Palaeontology and Stratigraphy Museum “Prof. Dr. Paulo Milton Barbosa Landim” but of course, its sister lineage, which includes at the Geology Department, Universidade Estadual Paulista “Júlio the remaining representatives of Isopoda (Wäge- de Mesquita Filho” (UNESP), Rio Claro, SP, Brazil, catalogued as le 1989; Brusca & Wilson 1991; Wilson & Keable URC. AC. 196. This series contains 19 rock slabs with 14 specimens 2001), must be of the same age. With about 90 preserved, five of which have a counterpart. An additional part and counterpart specimen used in the description (LPRP/USP 0003 A,B) extant formally described species, they are mainly is deposited in the Palaeontology Collection of the Faculdade de Fi- found in Australia and New Zealand. Yet, some spe- losofia, Ciências e Letras de Ribeirão Preto, University of São Paulo cies also occur in South Africa (Gouws 2008) and (FFCLRP/USP), Ribeirão Preto, SP, Brazil. India (Wilson & Reddy 2011). Phreatoicideans live The material figured here (Fig. 1) comprises almost all of the fossil specimens of this kind recovered from the above-mentioned on the surface vegetation or buried in sediments of collections, with only a few additional samples in the Palaeontol- freshwater environments, such as streams, ponds, ogy Collection of FFCLRP/USP. Some specimens of the species A chimera-like fossil crustacean 213 Fig. 1 - Overview of the specimens of the new species of eumalacostracan crustacean described in this work. All specimens to the same scale, except the isolated leg element, R. Background filled with virtual matrix. described here were collected by the authors (PGP, MCL, and RR), Provenance of the material others were already deposited in the collections, resulting from decades All fossil material used in this research comes from a sin- of collection efforts by several researchers. These fossil specimens are gle outcrop, along a secondary farm road about 3 km south-west quite rare, especially compared with the occurrence of other eumal- of the urban area of Rio Claro, São Paulo State, south-eastern Bra- acostracan found in the same
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