A character is a inherited trait of an organism. They have a hollow nerve cord that ends in a brain. The chorion is the hard, protective, outer part of an insect egg. The members of a clade are related to each other. They show the distribution and origins of shared characteristics.
Cladograms are testable hypotheses of phylogenetic relationships.
Claspers hold onto the female's abdomen during mating. In classification, a class is a group of related or similar organisms. A class contains one or more orders. A group of similar classes forms a phylum. The classification of organisms helps in the their study.