[4] Their young develop within the body of their mother, and emerge as juveniles.

[3][4] They are capable of producing an ink-like substance, which they release if disturbed.

[4] H. globulosus has a distinct head, round body, and long tentacles.

[4] The body is translucent but the internal organs are bright orange or yellow in colour.

[3] H. globulosus is found in the eastern Indo-Pacific Ocean, but its range is strongly influenced by currents.