Arthropods arose suddenly (Talk.Origins)

Claim CC220:


 * Arthropods arose suddenly in the fossil record. There are no transitionals leading up to them.

Source: No source given.

CreationWiki response:

All three so-called transitional types seem to be arthropods, two of which have a single mosaic trait. So thank you Talk.Origins for proving this claim 100% correct.
 * A comparison of Anomalocari and arthropods; particularly millipedes; strongly suggest that Anomalocaris should be classified as an Arthropod. Most likely Anomalocaris was simply an aquatic Arthropod. Their lobopod legs are a mosaic trait, but nothing objectively transitional.
 * A comparison of Opabinia and arthropods strongly suggest that Opabinia should be classified as an Arthropod. Most likely Opabinia was simply an aquatic Arthropod. Their lobopod legs are a mosaic trait, but nothing objectively transitional.
 * Spriggina had more than just a trilobite's head shield but the same basic body structure. The main difference seems to be that Spriggina had a longer body. Most likely Spriggina were just long trilobites.
 * Reference: Vendian Animals: Spriggina