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Closeup of Paracrangon echinata head showing the spiny rostrum. Photo by Dave Cowles, July 2005
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Most crangonids have a very stubby rostrum, seen here as the small "horn" between the eyes for Crangon alaskensis
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A dorsal view shows that there are plenty of stiff spines sticking out to the sides, as well. Photo by Dave Cowles, July 2005
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As with all Crangonids, the first pereopod of Crangon alaskensis is subchelate and the carpus of the second pereopod (visible just above the chela) is simple rather than multiarticulated.
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The chelae of this species are subchelate. This is the right chela. Length about 2 mm. Photo by Dave Cowles, July 2005
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The dactyl of the 5th pereopod is not broad and flattened.
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This species has many tiny greenish eggs, which it carries on the pleopods under the abdomen as visible in this ventral photo.
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The carapace is smooth and has one median spine a short distance behind the eyes, as can be seen silhouetted in this view from the right side.
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Paracrangon echinata captured at 100 m depth in San Juan Channel. The arched posture with spines exposed is a typical defense "cataleptic" posture. Length about 6 cm. (Photo by: Dave Cowles July 1997)
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The 5th segment of the abdomen (left full segment in this photo) has no spines on the posterolateral margin (right edge of segment), and the 6th segment (middle of photo) has no longitudinal dorsal ridge. The uropods and telson are to the right.
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In this underside (ventral) view of the head the subchelate first pereopods can be clearly seen. In this dorsal view of the head the small rostrum and the single median spine behind it can be seen. The arrangement of the eyestalks can also be clearly seen.
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The ventral side of abdominal segment 6 has a median groove, visible as the light-colored area in this photo.
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The antennal scale of the second antennae, being held out by my finger in this photo, is more than twice as long as wide and the spine on the end (left side of scale) is longer than the flatter lamella (right side of end of scale)
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The upper posterolateral margin of abdominal segment 5 has no spines, as seen in this dorsal view. Anterior is to the right, and segment 6 is to the left.
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A view of the whole, live animal ffom which the parts above were photographed. Photo by Dave Cowles, July 2005
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Abdominal segment 6 has a dorsal median groove (sulcus) but no median ridge. Anterior is to the right and the tailfan is to the left.
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(Crangon alaskensis from 100 m depth, San Juan Channel, WA. About 5 cm long. (Photo by: Dave Cowles, July 2000)
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The ventral sides of abdominal segments 5 (right) and 6 (left) are both smooth and clear, with no median groove (sulcus). This view is an oblique view of the right pleura and the ventral side from the right side of the shrimp. The base of leg 5 can be seen at the right.
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Adult female Neocrangon communis from 308 m depth near the southwest coast of Kamchatka (Photo by: Andrey Gontchar )
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The feathery exopods of the pleopods are typically held out to the side. They are used for swimming and likely also for burrowing.
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This individual was carrying a large batch of white eggs.
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Crangon alba captured in Padilla Bay tide flats (Photos by: Dave Cowles, July 2008)
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Crangon alba captured in Padilla Bay tide flats (Photos by: Dave Cowles, July 2008)
