BIOL 1604 Lecture Notes - Lecture 12: Osmoregulation, Cryptobiosis, Tardigrade

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26 Feb 2017
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Other Ecdysozoans
Phylum Onycophora
Velvet worms” , “walking worms”
Triploblastic bilateral coelomates
Segmented (but external segmentation is suppressed)
Soft cuticle that contains chitin and proteins
Several molts (ecdysis). Cuticle molted in patches
Head with flexible antennae
14-43 pairs of lobelike legs each ending with a flexible pad and two claws
2 eyes
70 species
0.5-15 cm long
Rainforest and other tropical leafy habitats
All current species are terrestrial
Respiration
o Tracheal system that connects with pores scattered all over their body
Excretion
o Nephridia (one pair per segment)
Circulation
o Open circulatory system with tubular heart
Reproduction
o Dioecious
o Internal and external fertilization
o Viviparous (placental attachment between mother and young),
ovoviviparous, and oviparous
o Males can be smaller than females
o Direct development (no larva)
Feeding
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