Okay, the user wants me to translate "early vertebrate" into Spanish. Let me check the rules again. The first rule says to translate all content into Spanish. The second rule states that if the content is already in Spanish, leave it as is. The third rule is to provide only the translation without any explanations.
So, "early vertebrate" is in English. I need to translate it. The correct Spanish translation for "early vertebrate" would be "vertebrado primitivo". Let me make sure there's no existing Spanish content here. Since the original is in English, I should translate it. No explanations, just the result. Alright, that's straightforward.
vertebrado primitivo
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