The Jellyman Can

My name is Dhugal Lindsay and I am an Australian scientist from Queensland living and working in Japan. I work for the Japan Agency for Marine-Earth Science and Technology

I recently had the opportunity to lead a water column survey

The animal in this image is a jelly called Colobonema sericeum. It belongs to a group of jellies called the hydrozoans

The jelly in the second image is one of the main targets we have been searching for during our surveys off the east coast of Australia. It is known as the dinner plate jelly and goes by the scientific name of Solmissus incisa. There seem to be several undescribed species of Solmissus masquerading under the name Solmissus incisa and we are currently trying to sort out their taxonomy. Solmissus is a type of hydrozoan jelly belonging to the group Narcomedusae (Latin for sleepy snake-haired monster). Narcomedusae mostly eat other gelatinous critters. Their long, thick tentacles extend outwards from mid-way up the bell, instead of being attached to the rim of the bell, like in most other jellies. Narcomedusae hold their tentacles in front of them when they swim so that the stinging cells on the tentacles come in contact with their prey before the prey can sense the movement of the swimming jelly.

Narcomedusae also seem to be parasitic in the early stages of their lives. Some species are known to develop inside of a fully grown adult, rather than developing free in the water column. In at least one Solmissus species the eggs hatch and the larvae develop within brooding pouches in the stomach of the adult. The bright white spots flanking the base of the tentacles in the animal in the above image probably have larvae developing in them.

Every dive we make in the midwater yields new discoveries so I cannot wait to do our next dive further north off Cape York!

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