01840nas a2200217   4500008004100000022001400041245005200055210004500107260001600152300001000168490000800178520121400186653001801400653001601418653002801434653001501462653001301477100002401490700001401514856009401528       2022                        eng d  a1755-691000aOn the morphospace of eurypterine sea scorpions0 amorphospace of eurypterine sea scorpions  cSep-09-2021  a1 - 60 v1133 a<p>Eurypterids (sea scorpions) are a group of extinct, marine euchelicerates that have an extensive Palaeozoic record. Despite lacking a biomineralised exoskeleton, eurypterids are abundantly preserved within select deposits. These collections make statistical analyses comparing the morphology of different genera possible. However, eurypterid shape has not yet been documented with modern geometric morphometric tools. Here, we summarise the previous statistical assessments of eurypterid morphology and expand this research by presenting landmark and semi-landmark analyses of 115 eurypterid specimens within the suborder Eurypterina. We illustrate that lateral compound eye morphology and position drives specimen placement in morphospace and separates proposed apex predators from more generalist forms. Additionally, evidence for size clusters in Eurypterus that may reflect ontogeny is uncovered. We highlight the use of geometric morphometric analyses in supporting the naming of new taxa and demonstrate that these shape data represent a novel means of understanding inter-generic ontogenetic trajectories and uncovering developmental changes within the diverse euarthropod group.<br />
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10aEuchelicerata10aEurypterida10ageometric morphometrics10amorphology10aontogeny1 aBicknell, R., D. C.1 aAmati, L.  uhttps://www.cambridge.org/core/services/aop-cambridge-core/content/view/S175569102100030X