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Which of the following is NOT an animal of Phylum Chordate?
Earthworm
Frog
Rabbit
Snake
Earthworm
Earthworm belongs to the Phylum Annelida, not Chordata. Chordates are defined by the presence of a notochord, a dorsal hollow nerve cord, and pharyngeal gill slits at some stage of their life cycle.
Earthworm belongs to the Phylum Annelida, not Chordata. Chordates are defined by the presence of a notochord, a dorsal hollow nerve cord, and pharyngeal gill slits at some stage of their life cycle.
Think of Chordata like a club that requires a 'membership card' (the notochord). An earthworm doesn't have this card, so it is an 'Annelid' instead.
PHRNS: Pharyngeal slits, Hollow nerve cord, Retro-anal tail, Notochord, Segmented muscles.
Classification in the Animal Kingdom is based on body symmetry, germ layers, and the presence of a notochord. Phylum Chordata specifically requires the presence of a notochord, whereas Phylum Annelida is characterized by metameric segmentation and a coelomate body structure without a notochord.
Chordates possess a notochord at some life stage.
Earthworms belong to Phylum Annelida, characterized by segments called metameres.
Frog, Rabbit, and Snake are all vertebrates, a subphylum of Chordata.
Vertebrata is the largest subphylum of Chordata.
Biological research on regeneration
Taxonomy and evolutionary studies
| Feature | Earthworm | Frog/Rabbit/Snake |
|---|---|---|
Presence of Notochord | Absent (Annelida) | Present (Chordata) |
Earthworms respire through their skin (cutaneous respiration).
Option B (Frog) is an Amphibian, Option C (Rabbit) is a Mammal, and Option D (Snake) is a Reptile. All are Chordates.
A is correct — Earthworm belongs to Phylum Annelida and lacks the diagnostic features of Chordata, specifically the notochord.
Always remember the 'Big 3' defining features of Chordates: Notochord, Dorsal hollow nerve cord, and Pharyngeal slits, as these are the most common focus areas for exams.
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