In detail, describe an INVERTEBRATE (no backbone animals) anatomical structure, organ or organ system in a single species or group of related species. You are allowed to compare the structure across various species in a larger group such as a genus, family or order. Your paper must discuss the function of the structure and the importance of the structure to the evolution of the species (or higher taxa). What is the significance of the structure/organ to the survival of the individual animal? Your paper must address the evolution of the structure as it is known or hypothesized to have evolved (if known). You may include any related information you see fit from the molecular to ecological levels including relationships such as symbiosis if it is relevant to the topic (this is not required, only if it is important to your particular paper topic).
The paper may NOT be on a vertebrate animal. That is, you CANNOT write the paper about a structure in any fish, amphibian, reptile, bird or mammal. This is NOT simply a general summary review of an invertebrate animal, read the above carefully – it is focused on a key structure
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