Crossota

Thuesen, Erik V., 2003, Crossota millsae (Cnidaria: Trachymedusae: Rhopalonematidae), a new species of viviparous hydromedusa from the deep sea off California and Hawaii, Zootaxa 309, pp. 1-12 : 5

Key to the species of Crossota in the Pacific Ocean

1 Gonads nearer ring canal than manubrium; umbrella colourless ...................... C. alba

­ Gonads located nearer manubrium than ring canal, umbrella pigmented ................... 2

2 Gonads located approximately halfway between base of manubrium and mid­point of radial canal, umbrella with burnt­tangerine pigment .................................... C. millsae

­ Gonads near base of manubrium ................................................................................. 3

3 With 200­250 tentacles in one row; umbrella deep reddish brown ...... C. rufobrunnea

­ With 600 or more tentacles, apparently in several rows; umbrella pale brown ............. ....................................................................................................................... C. brunnea