The same species as yesterdays image. Today I show the entire caterpillar in close-up. So it is a good occasion to tell something about the caterpillar-anatomy:
Most caterpillars have tubular, segmented bodies. They have three pairs of true legs on the three thoracic segments (In this image the uppermost 3 legs). You also can see here four pairs of prolegs on the middle segments of the abdomen, and a single pair of prolegs on the last abdominal segment. There are ten abdominal segments.
Like all insects, caterpillars breathe through a series of small openings along the sides of their thorax and abdomen called spiracles. These branch into the body cavity into a network of tracheae. You can see these spiracles as little ovals in the middle of the black strikes on the side of every segment.
Caterpillars do not have good vision. They have a series of six tiny eyelets or 'stemmata' on each side of the lower portion of their head. These can probably form well focused, but poorly resolved images. Caterpillars move their heads from side to side probably as a means of judging distance of objects, particularly plants. They rely on their short antennae to help them locate food. The eyelets can be seen in the image in the black spot on the head.
Image: Lille (BE) - 21/07/2010
© Johan Dierckx
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