| 1 | Butterflies and shrimps and other animals with jointedlegs belong to Arthropoda. | |
| 2 | Arboviral infections are most common in the summer, when arthropod vectors are abundant . | |
| 3 | This distinguishes them from mollusks and arthropods , in which this first opening becomes the animal's mouth . | |
| 4 | By contrast, only half of the genera of molluscs (the real ones) and arthropods disappeared. | |
| 5 | Here's a tunicate, also called a sea squirt, which is in Chordata, anda crab, in Arthropoda. |
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