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Are you seeing an eye spot that looks like a target when it is agitated? The bright orange on the funnel makes me think of vulgaris but the original images still have me thinking hummelincki. Does it sleep most of the night? I have observed that O. hummelincki needs its beauty sleep at night whether or not it is out during the day where O. vulgaris varies it hunting time and can be seen out often at night.
He is in my classroom, so I don't see him at night. He is quite active during the day. I have yet to see a blue spot like my last hummelincki had, so I was leaning toward vulgaris, but he doesn't have the same amount of webbing of most vulgaris' that I've seen.
LOL, I was going to say the underside looks very hummelincki but in the video the arms and mantle look more vulgaris. Hummelincki arms are sort of stubby and almost form a triangle. This one (does he/she have a name?) seems to have longer arms and a longer, less "chunky" mantle. I have often thought O. hummelincki cannot fit through as small of a hole as an equal sized O. briareus because their mantle seems much thicker and more muscular. This is very evident when they are preserved.
I am glad you are getting across to the kids that there is much left to be discovered and hopefully that each discovery we do make brings new questions to be answered.