BIOLOGICAL CLASSIFICATION
KINGDOM ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -A modern human-one species of mammal-is a familiar example of a chordate. However, we share this phylum with two groups of invertebrates as well. Tunicates (subphylum Urochordata) and lancelets (subphylum Cephalochordata) are the only invertebrate groups within the phylum Chordata.
Detailed explanation-2: -Like tunicates, they are suspension feeders. The lancelet, like all cephalochordates, has a head. Adult lancelets retain the four key features of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
Detailed explanation-3: -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.
Detailed explanation-4: -Summary – Lancelets vs Tunicates They belong to separate subphyla. In this regard, lancelets belong to the subphylum Cephalochordata while tunicates belong to the subphylum Urochordata. They are exclusively marine. Tunicates are sessile while lancelets are not sessile and resemble fish.