<Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (June 2013) (Learn how and when to remove this template message) </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Obelia </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> Scientific classification </Th> </Tr> <Tr> <Td> Kingdom: </Td> <Td> Animalia </Td> </Tr> <Tr> <Td> Phylum: </Td> <Td> Cnidaria </Td> </Tr> <Tr> <Td> Class: </Td> <Td> Hydrozoa </Td> </Tr> <Tr> <Td> Order: </Td> <Td> Leptomedusae </Td> </Tr> <Tr> <Td> Family: </Td> <Td> Campanulariidae </Td> </Tr> <Tr> <Td> Genus: </Td> <Td> Obelia Peron and Lesueur, 1810 </Td> </Tr> <Tr> <Th_colspan="2"> Species </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Obelia dichotoma </Li> <Li> Obelia geniculata </Li> <Li> Obelia longissima </Li> <Li> Obelia bidentata </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Obelia </Th> </Tr> <Tr> <Th_colspan="2"> Scientific classification </Th> </Tr>

What are the structural differences between obelia and jellyfish