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|MacroTaxon 1: Found at Lambir Hills National Park, caught in a simple bottle trap in a rocky, deeper part of the Latak Stream (part of Sg. Liam) in a “glide” area near a small waterfall. Assumed to have been scavenging at night. The species is notable for the very prominent bumps/spikes on its long, enlarged fore-claws. It also has three spaced-out rostrum spines at the base, and the rostrum itself forms a crease with the carapace above the eye. In general these seem more aggressive though that might just be due to the fact that I was only able to conclusively identify dominant males.|
at Lambir Hills
National Park, caught in simple bottle traps in rocky,
shallow “riffle” and “glide” parts of the Latak Stream (part of Sg.
Assumed to have been scavenging at night. Note that MacroTaxon 2 has a
ratio compared to MacroTaxon 1, as less claw spikes (but still
bumpy), claws that end in more pointy, curved tips, and only two
spines at the base instead of three. It seemed like the most common
species at Lambir, if it is true that shrimp coloration varies due to
their diet and not genetics. Examples of two different-colored
MacroTaxon 2 shrimp are pictured. Both have the same features as
described for MacroTaxon 2.
A living specimen of this species (of a redder tinge) was also found in a very small, isolated “stagnant” pool near the bottom of a short waterfall along Latak Stream, which it shared with a clawless female (assumed). When disturbed it would raise its claws as the female hid behind or underneath it. Typical behavior of MacroTaxon 2? I don’t know. But it was kinda cute.
|MacroTaxon 3: Found at Lambir Hills National Park, caught in a simple bottle trap in a rocky, shallow part of the Latak Stream (part of Sg. Liam). Assumed to have been scavenging in the afternoon. Although it is probably still not fully developed because of its transparent body and thin exoskeleton, this was definitely a different species because of its different claw shape, lack of claw bumps/spines, and different number of static tail spines. The rostrum on this one is not very pronounced and there were no spaced-out rostrum spines (though there were teeth/ridges). Suspected juveniles of this species (shown) were found in many of the “stagnant” branching streams throughout the forest at Lambir, though I could only assume they were of the same species by the general claw shape (for all I know they could be yet another species). Really not much is known about its behavior.|
|Coral Banded Shrimp (Stenopus hispidus): Picture courtesy of Greg. It was found about 5 meters underwater off of Gaya Island by Min-Sheng, by the dropoff. It was very shy and seemed to stay in this one crevice created by shelf coral and rock throughout our stay at Gaya Island. These shrimp also supposedly clean fishes and other animals, but since I was unable to stay so deep underwater (it resided at about 5-7m deep) for a good amount of time I couldn’t observe this behavior myself. Note how the most prominent claws aren’t its front limbs, and it has two other pairs of limbs before the largest limbs come out.|
courtesy of Greg.
No one was
able to get a really good picture of the Goby Shrimp, and my
own underwater pictures came out blurry, but I derived their
characteristics from sketches and notes I made from quick glimpses of
while waiting very patiently near goby holes in the fore-reef at Gaya
Island. This particular picture (bit of a stretch…but look closely)
has arrows showing the shrimp antennae
resting on the goby, and part of its claw. It looked much
but smaller, darker, and with a more mottled pattern. I suspect it
might be Alpheus bidens,
since appeared to have no rostrum, but I can’t find a picture of one to
compare it with.
Again, I was mostly only able to get characteristics of their patterning and claws, which were asymmetrical (indicating that it is Alpheidae), and note that it had either a very reduced or absent rostrum.
These shrimp, which belong to the family Alpheidae with other asymmetrically-clawed shrimp, practice mutualistic behavior with the Goby fish; they have very bad eyesight and rely on the Goby fish to warn them of danger using a distinctive tail movement, and in return the Goby fish stay in the holes dug out by the Goby Shrimp.