Both lancelets and tunicates are marine chordates. The former is motile, and the latter is sessile. Tunicates have a special shell or tunica. Here, let's look at the differences between Lancelets and Tunicates.

Lancelets are tiny, fish-shaped organisms with pointed ends. On the other hand, tunicates are small with the barrel-shaped body. Lancelet’s body has myomeric segmentation, i.e., it contains blocks of sequentially arranged skeletal tissues.

2024年11月23日 · Urochordata (tunicates) and Cephalochordata (lancelets) are invertebrates because they lack a backone. Larval tunicates (Urochordata) posses all four structures that classify chordates, but adult tunicates retain only pharyngeal slits.

2019年12月4日 · Lancelets and tunicates are the two groups of invertebrates found in the phylum Chordata. Generally, they possess four distinctive features of chordates at some point during their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.

2022年4月15日 · Both lancelets and tunicates are chordates; these filter feeders are the only invertebrates within the phylum Chordata which consists of animals with flexible rods that support their backs. Lancelets belong to the subphylum Cephalochordata while tunicates belong to the subphylum Urochordata

Lancelets and tunicates are both marine invertebrates belonging to the phylum Chordata, but they differ in several aspects. Lancelets, also known as amphioxus, are small, fish-like animals that retain many primitive chordate characteristics throughout their lives.

Tunicates (subphylum Urochordata) and lancelets (subphylum Cephalochordata) are the only invertebrate groups within the phylum Chordata. Figure 3.97 shows some invertebrate representatives of the phylum Chordata.

Lancelets. There are only about 25 living species of lancelets. They inhabit the ocean floor where the water is shallow. Lancelet larvae are free-swimming. The adults can swim but spend most of their time buried in the sand. Like tunicates, lancelets are filter feeders.

2006年2月23日 · Tunicates or urochordates (appendicularians, salps and sea squirts), cephalochordates (lancelets) and vertebrates (including lamprey and hagfish) constitute the three extant groups of chordate...

In summary, lancelets are motile, fish-like chordates with a segmented body, while tunicates are sessile, barrel-shaped organisms lacking segmentation. They both belong to the phylum Chordata but have distinct differences in their structure and lifestyle.