Taking a Look at Horseshoe Crabs

1795 Words Feb 26th, 2018 7 Pages
The horseshoe crab is part of the arthropods, which include organisms such as spiders and scorpions. The horseshoe crab is made up of the prosoma, which is the head, opisthosoma, which represents the central part of the body and the telson, which is the tail. The tail is harmless and is only used to help the crab flip itself over if it’s turned over on the wrong side. Horseshoe crabs have been researched numerous times. Findings include their, ancestry, survival, morphological changes (if any) and phylogenetic research among the different variations of horseshoe crabs.
Studies have found information on ancestral species of current horseshoe crabs. Xiphosurids, which are very old fossils that were not easily found; however, they were compared in body structure of current time horseshoe crabs and showed that there was hardly any change in the body structure. The body plan of a xiphosurid is described as having large crescent like shield in the anterior portion of its body resembling an invertibrate with lateral compound eyes. Xiphosurids are also classified as having opisthosomal tergites built into a thoracetron and having a long styliform telson (Rudkin et al. 2008).
Ancestry of xiphosurid has so far been researched as a group of rare Middle-Late Palaeozoic fossil arthropods, which are in the group of…

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