Which type of large intestine worm was primarily studied by Ivan Mackerie?
Mongolian death worm The Mongolian death worm (Mongolian: олгой-хорхой , olgoi-khorkhoi, "large intestine worm") is a creature
Pale green eel The pale green eel ("Heteroconger digueti"), also known as the pale garden eel or the Cortez garden eel, is an eel in the family Congridae (conger/garden eels). It was described by Jacques Pellegrin in 1923, originally under the genus "Taenioconger". It is a nonmigratory marine, deepwater-dwelling eel which is known from the eastern central Pacific Ocean, including the Gulf of California and Mexico. It dwells at a depth of 230 to and inhabits sandy sediments near reefs in large colonies. Males can reach a maximum total length of 63 cm .