Tiaropsidium kelseyi

Taxon-Order: 
Hydrozoa: Leptothecatae

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Distribution: 
Pacific Ocean.
Habitat: 
90-180 m depth
Size: 
Up to 50 mm bell diameter, as adults.
Useful Facts or Characters: 

The umbrella is about 3 times as broad as high. The manubrium is small, short, with thin walls and slightly frilled lips. It has 8 marginal tentacles. The umbrella is colorless, transparent along with the manubrium, canals, and gonads; tentacles have a slight yellow color.

References: 

Torrey, H.B. (1909) The Leptomedusae of the San Diego Region. University of California Publications in Zoology 6: 11-31.