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. Both the antennules (first antennae) and the antennal scale have prominent setae which together make the animal look like it has a thick moustache from a distance. Note also the long second antennae, visible on the left side of the animal (top), which extends forward, has a sharp bend, and has a long flagellum extending back. Photo of preserved specimen.
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The long antennal flagellum is lined along one side with a double row of curved setae which arch outwards and then curve toward one another like the ribs of a vacuum cleaner hose. Shorter, enervated setae are found in the middle of the circle formed by the long setae. Together, this structure forms a lateral-line like detector of near-field sound or vibrations.
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As can be seen in this dorsal view of a preserved specimen, the curving vertical grooves on the carapace cross the mid-dorsal ridge but are not interrupted by it.
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Most of this species' body is transparent, with small red chromatophore spots. The internal thoracic organs are opaque red or black. The organs of Pesta (not readily visible in this photo) are ventral to the dark thoracic organs. Note the tiny rostrum (the small red dorsal bump behind the eyes). The long second antennae trail out to the right of this photo. Swimming is almost exclusively by the pleopods. Photo by Dave Cowles For an .mpg video of this species swimming in a swim tunnel, click Here (8 megabytes). Note in the video (and in the image at the top of this page, which was taken from the video), that the animal turns downward when exposed to the light of the camera. This is because it is a vertical migrator.
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The same grooves plus other carinae can be seen here in this side view of the carapace
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Eusergestes similis can be distinguished from Sergia tenuiremis by the small, acute, upward-pointed rostrum and by the presence of a supraorbital and a hepatic spine. This photo is of a preserved individual.
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The distinctive rostrum has a dorsal spine, a line of forward-pointing setae, and an anterior spine.
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The epimera of abdominal segment 2 does not overlap those of segments 1 and 3, showing this species is not a Caridean shrimp. Photo from a preserved specimen
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The telson is shorter than the uropods. It ends with only one pair of stout median spines, (with a row of setae between them)
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The telson is shorter than the uropods, and both telson and uropods are fringed with setae. Photo from a preserved specimen
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Bentheogennema burkenroadi, bathypelagic 100 mi off Point Conception, CA (Photo by: Dave Cowles, Sept 1995)
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Eusergestes similis, captured off Point Conception, CA May 1996. Photographed live swimming in a swim tunnel. Total length approximately 6 cm. (Photo by: Dave Cowles, May 1996)
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This closeup of the side of the carapace shows the dendrobranchiate (branching like a feather) gills underneath. This gill pattern is characteristic of dendrobranchiate decapods such as Penaeids but is not seen in true shrimp or in crabs.
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Expert review, taxon ID uncertain based on photo; definitely not benthesicymus
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