Spirontocaris arcuata

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Rathbun's bladed shrimp:
Rathbun's bladed shrimp (Spirontocaris arcuata): Rathbun's bladed shrimp is a common low intertidal and shallow subtidal species. These are commonly found in rocky habitats with small cobble and shell substrates. Like all members of the genus Spirontocaris, this species has two supraorbital spines and a relatively deep and prominent rostrum. This species is similar in appearance and habitat to the Spirontocaris ochotensis. The easiest way to seperate the two species is by looking at the rostrum. The rostrum of S. arcuata extends forward-most below the midrib of the rostrum. Also, the dorsal spines on the carapace of S. arcuata extend back past the halfway point of the carapace, rather than just to the middle as in S. ochotensis






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