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I’m currently working on a secret paleo-recreation project and was wondering whether Eurypterids (sea scorpions), specifically of the suborder Eurypterina, had 360 degrees of eyesight (like modern flies) due to compound eyes? If not, then could they move their eyes independently of one another? Or in other words, could sea scorpions move their eyes to look in two different directions at once?

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Eurypterids, like many other arthropods, perceived visual senses through a combination of ocelli (simple eyes) and compound eyes. These are quite different from vertebrate eyes and do not move in the way that our eyes move. It would be difficult to even speculate as to how they would perceive their visual surroundings in terms of how we perceive things, since they would do so through 2 different sensory apparatuses, and their eyes are so very different from the morphology of vertebrate eyes. 


Here is what the Treatise on Invertebrate Paleontology, Part P, Arhropoda 2, Chelicerata, page P24 has to say about subclass Eurypterida:


"The prosoma is moderately convex, with
a subquadratic, subtriangular to semicircular
outline. A pair of median ocelli,
which may be mounted on a node (Fig.
19,3d; 21,la; 29,3a), is generally situated on
the highest part of the prosoma.
The lateral compound eyes have a marginal
to subcentral or anterior position. The
eyes vary considerably in size and shape.
The large eyes of the Pterygotidae (Fig.
19,2; 22, 1a,2a,3a) have an elliptical outline.
In most eurypterids, the eyes are kidneyshaped,
and in some strongly curved (Stylonuracea,
Fig. 27,1,2b,3a,4a,6b,7b), with
the more or less steep visual surface facing
outward and forward. Small eyes are found
in Mixopterus (Fig. 25A). The visual surface
is composed of numerous closely set
pits representing the individual facets, visible
in Pterygotus (Fig. 19,2) and some
species of Hughmilleria."

Edited by Crusty_Crab
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