| जंतु | आकारिकीय लक्षण |
| $(i)$ मगरमच्छ | $4$-कोष्ठीय हृदय |
| $(ii)$ सी अर्चिन | पैरापोडिया |
| $(iii)$ ओबेलिया | मेटाजेनेसिस |
| $(iv)$ लीमर | थीकोडॉन्ट |
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