En los últimos años, el estudio de malformaciones en trilobites ha suscitado interés numerosos paleontólogos, habiéndose realizado incluso algún trabajo sintesis sobre este tema. la Península Ibérica se han registrado hasta presente cuatro casos estas y únicamente uno ellos, Placoparia (Coplacoparia) borni Hammann, recoge síntesis más completo tema, que sido por Owen 1985. presentan tres españo...

Abstract Sexual reproduction represents a fundamental aspect of animal biology, but the diversity reproductive strategies among early Paleozoic metazoans remains obscure. Direct evidence comes from exceptionally preserved egg masses in Cambrian and Ordovician euarthropods such as waptiids trilobites, anatomical or behavioral adaptations for mating these taxa are all unknown. We demonstrate pres...

Abstract The Devonian was a time of drastic environmental change that shaped the morphology trilobites. This study aims to investigate their morphological evolution and show influence some abiotic biotic factors (bathymetry, feeding habits visual abilities) on shape. A dataset compiled shape three structures (cephalon as whole, central part cephalon, pygidium) trilobites from North Africa, usin...

This paper presents a phylogenetic analysis of the ‘‘Fallotaspidoidea,’’ a determination of the biogeographic origins of the eutrilobites, and an evaluation of the timing of the Cambrian radiation based on biogeographic evidence. Phylogenetic analysis incorporated 29 exoskeletal characters and 16 ingroup taxa. In the single most parsimonious tree the genus Fallotaspidella Repina, 1961, is the s...

Trilobites inhabited all environments of Paleozoic seas, ranging from estuaries to continental slopes, and were globally distributed. Although their functional morphology phylogenetic relations are established by well-preserved body fossils, the behavior trilobites has received less attention. Three well-known trace fossils interpreted be produced trilobitomorphs when preserved in rocks, Rusoph...

The aim of this study is to bridge a gap in the existence of Trilobites in the marine Permian successions of Iran by exploring a stratigraphic section of the Permian in Jamal Formation (Dizlu section).  Based on comprehensive field studies and laboratory investigations three Trilobite specimens were identified in the study area including Pseudophillipsia (Carniphillipsia) dizluensis sp. nov., P...