Sally Light Foot Crab
This crab was chosen for many of
the reasons that the shrimp was chosen: it eats algae and it does
not grow to be too large. This species is also known as the
Nimble Spray Crab or Urchin Crab.
Sally is a scamperer, almost
like a spider on amphetamines. He (this one happens to be a male)
can graze for a while,
but then instantaneously be 3-4 body widths to one side or the
other. When you consider where his eyes are, it is amazing
that he can move at all, let alone at blinding speeds.
Given the convex nature of the rock surfaces, there is no way he
can see where his legs are about to go. I guess he feels
his way so rapidly that I can't see it. Maybe a video
camera and bright lights will reveal something when I get bored
with the new corals.
Here you can see the
yellow bands on the legs which result in his feet being
"light". You can also see the whiteish-blue
"grin" under (above, in this picture) his eyes.
His light foot is very prominent here.
A great closeup
of the Sally as he investigates the long tentacled Pacific
Anemone. The detail around the eyes is especially
good. Also notice the bristles on the legs. The
mottled carapace is not such good camaflage on the rocks of the
While trying to
climb the glass, you can see his entire configuration from
below. Notice the light semi-circle around his face.
When viewed from the side, sometimes the only thing I can
see from a distance is this bright blueish "grin".
Sally dances with himself in the mirror of the tank's glass.
"grin" is clear here, as are his front feet and
eyes. You can barely see a whisper of an
"eyebrow" above and inside the left eye. He has
a pair of small antennae which whip around constantly, flickering
almost like windshield wipers (but too short to reach the
eyes). Function unknown.
He blends into
the rocks very well: it can be difficult to find him.
There is one
part of the tank which is not glass. It is the
"overflow" area and is made of black plastic. It
contains a series of small slots to allow the water to exit the
tank to the pump and filters. Here Sally has gripped the
slots and is feeding on the algae. The result is a striking
silouhette. You may be able to barely make out the slots on
algae off of a snail (under his right front long leg) while
apparantly unimpressed by the Atlantic Anenome's tentacles.