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The Importance of Lithographic Limestones for Revealing Ontogenies in Fossil Crustaceans

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The Importance of Lithographic Limestones for Revealing Ontogenies in Fossil Crustaceans Swiss J Geosci (2011) 104 (Suppl 1):S85–S98 DOI 10.1007/s00015-010-0033-1 The importance of lithographic limestones for revealing ontogenies in fossil crustaceans Joachim T. Haug • Carolin Haug • Dieter Waloszek • Gu¨nter Schweigert Received: 20 August 2009 / Accepted: 18 August 2010 / Published online: 6 October 2010 Ó Swiss Geological Society 2010 Abstract Developmental biology has become a major Lebanon have also yielded malacostracan larvae and issue for understanding the evolution of Arthropoda. juvenile specimens. We present a summary of the occur- While usually only the ontogenies of extant species are rences of crustacean fossils providing developmental studied, developmental information of fossil arthropods information and a demonstration of the potential of the may exhibit developmental patterns not present in living lithographic limestones in this context. The importance of ones. Crustacea possess, basically, a more gradual developmental data for understanding crustacean evolu- development than, for example, pterygote insects and tion is also highlighted. would, therefore, be appropriate candidates for the study of fossil ontogenies. Remarkably, famous fossil deposits Keywords Larvae Á Phyllosoma Á like the Devonian Rhynie Chert or the Early Palaeozoic Solnhofen Lithographic Limestones Á ‘Orsten’-type deposits do not comprise the generally Ontogenetic development Á Phylogeny Á Evolution macroscopic malacostracan Crustacea (although most probably adult malacostracan fossils have already been found in the Cambrian). By contrast, the Late Jurassic Evolution and development Solnhofen Lithographic Limestones of southern Germany provide thousands of specimens (although only few mor- In recent years, evolutionary developmental biology has photypes) that can be identified as malacostracan larvae, become a major contributor for the reconstruction of together with juvenile specimens differing in certain evolutionary scenarios, particulary in arthropods (e.g., morphological aspects from their conspecific adults. More Schram and Koenemann 2001, 2004; Damen 2007; Prpic recent investigations with up-to-date imaging methodol- 2008). Developmental information on fossil arthropods ogy on additional malacostracan crustacean larvae yielded can contribute to arthropod evo-devo issues as well as also reconstructible developmental sequences of species data on extant species (e.g., Schram and Koenemann from the Solnhofen deposits. The very similar fossil 2001; Olesen 2007), although it has, up to now, only deposits of the Cretaceous lithographic limestones of rarely been taken into account. Here we do not aim to discuss how these data can be technically incorporated into such comparisons (for this issue the reader is directed to Walossek 1993; Schram and Koenemann 2001; 2004; Editorial handling: Christian A. Meyer & Daniel Marty. Olesen 2007). We want to present a survey on which types of fossil preservation are detailed enough to con- J. T. Haug (&) Á C. Haug Á D. Waloszek Biosystematic Documentation, University of Ulm, tribute developmental data of fossils of the arthropod Helmholtzstr. 20, 89081 Ulm, Germany taxon Crustacea for reconstructing the phylogeny and e-mail: [email protected] evolution of this taxon. Our main focus is here on fossils from lithographic limestones, together with the presenta- G. Schweigert Staatliches Museum fu¨r Naturkunde Stuttgart, tion of hitherto unpublished specimens that demonstrate Rosenstein 1, 70191 Stuttgart, Germany the potential of these fossil deposits. S86 J. T. Haug et al. Contributions of 4-dimensional data and later carefully reconstruct the character evolution (e.g., Ramsko¨ld 1988; Guilbert et al. 2008; Haug et al. 2010a). Ontogenetic data contribute in various ways to phyloge- Additionally, developmental data indirectly contribute netic analyses and to the reconstruction of evolutionary to the evaluation of homology hypotheses. Similar mor- scenarios. One aspect is that they allow the evaluation of phogenetic pathways of possible homologous structures the taxonomic validity of a species. In the past, larval support a homology hypothesis (but compare Nielsen and stages of various taxa have been mistaken as separate Martinez 2003 for this issue). But it is important not to species. Common examples are the larvae of decapod overemphasise this argument for homology, as dissimilar crustaceans, e.g. the so-called ‘zoe¨a’ and ‘megalopa’, both morphogeneses do not necessarily exclude homology. of which were originally described as separate genera Early developmental patterns may change although the (Bosc 1802; Leach 1814) and only later recognised as final appearance of the structure remains the same. Scholtz larvae of already known species (for a detailed discussion (2005) has argued for the evolutionary independence of all see Gurney 1942). developmental stages, so that earlier stages might differ but Solving such an issue for a fossil species is a more lead to similar later stages, as it has already been empha- difficult task than for a living one, because it is not possible sized by de Beer (1958) and renewed by modern just to breed an unknown larval or juvenile specimen to an evolutionary developmental biology (e.g., Damen 2007). identifiable adult stage. Nevertheless, it is important to keep in mind when dealing with fossils that differences in Developmental data from fossil arthropods morphology may not be simply due to the presence of two different species, but rather may indicate the presence of As for other character complexes, fossils can exhibit onto- different ontogenetic stages of the same species. Consid- genetic character conditions that are not expressed in extant ering this has led to a reduction of the number of species in animals. This is especially important for the reconstruction several animal taxa—for example in such prominent of ground patterns and for the understanding of the early groups such as the dinosaurs (e.g., Dodson 1996; Horner evolution of a group. Developmental data of fossils have and Goodwin 2009). Including supposedly separate species been successfully used in various non-arthropod taxa (e.g., into a phylogenetic analysis that may be juvenile (or larval) Sevastopulo 2005;Nu¨tzel et al. 2006; Schoch and Fro¨bisch specimens of another species, which is also included in the 2006; Bandel 2007; Sumrall and Wray 2007). For fossil same analysis, might cause artefacts. Before running a arthropods, dorsal hard parts of trilobites or ostracod shields phylogenetic analysis it is, therefore, important to evaluate have mainly been used for ontogenetic studies (e.g., Gramm the taxonomic validity of the considered species. 1973; Schweitzer et al. 1986; Smith 2000; Hughes et al. Another aspect is that including ontogenetic stages into 2006 and references therein). Ontogenetic stages of trilo- phylogenetic analyses facilitates the use of additional bites have been recognised since the work of Barrande character sets. These can be ‘structural characters’ (sensu (1887). Trilobites and ostracods possess an enormous Hickman 1999), i.e., features that are only present in cer- advantage for reconstructing the ontogenetic sequence: tain stages, or ‘process characters’ (sensu Hickman 1999), their development is gradual with distinct developmental which add a significant set of data, as it becomes possible instars. not only to include presence or absence of a special The reconstruction of the sequence, i.e., the unequivocal structure, but also timing of appearance, either relative to assignment of non-adult stages to certain species is more other structures or relative to the developmental stage. problematic in many other arthropod groups, e.g., in A general difficulty of a phylogenetic analysis solely pterygote insects. There the reconstruction is additionally including adults is the assumption that these stages corre- complicated by the lack of comparable data from extant spond to one another (discussion of this issue for species. The knowledge of the ontogeny of extant insect arthropods in Minelli et al. 2006). But ‘heterochrony’, the species is, in fact, mainly limited to adults or late nymphal change of developmental timing, may be one of the driving stages, pupae and late larval stages. As some insects have forces of evolution and can be found in many textbooks several dozens of larval stages, and subsequent larval (examples from common textbooks: Futuyma 1998; Free- stages may differ significantly from each other, there exists man and Herron 2004). In many cases the adult stage of only little knowledge of most of the developmental one species does not correspond to the adult stage of sequences of insects (e.g., Klausnitzer 1991). Nevertheless, another species, but to an earlier developmental stage (e.g., there are rare examples demonstrating that fossil non-adult in case of neoteny, one example from arthropods in stages of insects contributed significantly to the under- Mjo¨berg 1925). For identifying such heterochronic chan- standing of the evolution of certain sub-groups in providing ges, especially with the correct polarisation, it is necessary developmental patterns not expressed in extant represen- to include developmental data into a phylogenetic analysis tatives (e.g., Vrsˇansky´ 2008). The situation is different for Ontogenies of fossil crustaceans in lithographic limestones S87 the basically more gradually developing Crustacea, and The ‘Orsten’ literature on developmental sequences of extant species is available for many different groups (‘Journal of Crustacean A
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