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| Placodermi |
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Order:
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Fossil_range: Early/Mid - Late |
The Antiarchi ("Opposite anus") were the 2nd most successful order of known, after the . The order's name was coined by , who, when examining some fossils that he thought were armored related to , mistakenly thought that the eye-hole was the mouth, and that the opening for the anal siphon was on the other side of the body, as opposed to having both oral and anal siphons together at one end.
The front portions of their bodies were heavily armored, to the point of literally resembling a box with eyes, with the sometimes scaled, sometimes naked rear portions often becoming , particularly with later forms. The pair of were modified into a pair of -like, or -like limbs. In primitive forms, such as , the limbs were thick and short, while in advanced forms, such as , the limbs were long and had elbow-like joints. The function of the limbs are still not perfectly understood, but, most hypothesize that they helped their owners pull themselves across the substrate, as well as allow their owners to bury themselves into the substrate.
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Review of Antiarcha at Palaeos
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-- 21:13, 24 September 2006 (PDT)