Modern sea star larva resemble some primitive vertebrae larvae. This similarity may suggest that primitive share a common ancestor with sea stars.
What are primitive vertebrae larvae?
- A scientist refers to something as "primitive" if it has undergone the least evolution since the first vertebrates.
- They lack paired pectoral (shoulder) and pelvic (hip) fins in addition to missing jaws.
- Even in lampreys, their notochord remains throughout their entire existence and is never entirely replaced by a backbone. They don't have scales.
- Hagfish are thought to be the most basic vertebrate known, living or extinct, as they lack both jaws and vertebrae.
- The invertebrate class most closely related to vertebrates is the tunicates.
- Ascidians, sometimes known as sea stars, are the most prevalent subgroup of tunicates. Ascidians are immobile, sessile creatures with bodies resembling vases.
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