Photos: Denizens of the Deep

Updated 10:56 PM ET, Tue January 15, 2013

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Precuthona are a very small nudibranch variety (less than two in. in length) and live in the shallow waters of the tidal zone to 100 ft deep. <a href="http://science.time.com/2013/01/15/denizens-of-the-deep-alexander-semenovs-pictures-of-undersea-creatures/" target="_blank">See the complete gallery on TIME.com.</a>

Denizens of the Deep – Precuthona are a very small nudibranch variety (less than two in. in length) and live in the shallow waters of the tidal zone to 100 ft deep. See the complete gallery on TIME.com.

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Photos: Denizens of the Deep

Denizens of the Deep – The Phyllodoce Citrina is avery active polychaeta that averaging nine in. in length

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Clione Limacina, or Sea Angel, is an excellent swimmer and dangerous predator, feeding exclusively on another pteropod mollusk , the Sea Butterfly. It is found for only a few weeks in the White Sea before disappearing for the remainder of the year.

Photos: Denizens of the Deep

Denizens of the Deep – Clione Limacina, or Sea Angel, is an excellent swimmer and dangerous predator, feeding exclusively on another pteropod mollusk , the Sea Butterfly. It is found for only a few weeks in the White Sea before disappearing for the remainder of the year.

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This image of a Alitta Virens' head displays its four eyes, antennae and sensory papillae. However, unseen are two sharp jaws that take up one-third of the 15 in. body length.

Photos: Denizens of the Deep

Denizens of the Deep – This image of a Alitta Virens' head displays its four eyes, antennae and sensory papillae. However, unseen are two sharp jaws that take up one-third of the 15 in. body length.

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