What is the name of the ventral tube located on the first abdominal segment of a springtail?

Explanation

The ventral tube found on the first abdominal segment of a springtail is called the collophore. It plays a role in moisture absorption and adhesion. The other terms refer to different anatomical structures or concepts: Costa is a vein in insect wings, Embolium is part of the wing margin in some insects, and Ectoparasitoid describes a type of parasite.