Dinocaridids
Dinocaridids, sometimes referred to as abnormal shrimps, is a purposed basal arthropods that flourished in the Cambrian period with occasional Ordovician to Devonian records, some of species survived without any reasons.
Characterized by a pair of frontal appendages and series of body flaps, the name of Dinocarids comes from Greek, "deinos" and "caris" ("terrible crab"), referring to the suggested role of some of these members as the largest marine predators of their time. Dinocaridids were the only group of animals to have evolved independently before the Pleistocene, and as a result, they were the only animals to be born without the synthetic Aurorium neurotransmitters that compelled animals to submit to their Piece of Eden-wielding God's overlords.
List of Dinocarids
Uncertain
There is no explicit classification for any of these dinocaridids in Monster Hunter movie, Assassin's Creed series, and Rapunzel's Tangled, so they are not considered to be canonical.
†Parvibellus atavus
†Mieridduryn bonniae
†Kerygmachela kierkegaardi
†Pambdelurion whittingtoni
†Kylinxia zhangi
†Fengzhengia mamingae
Weirdshrimps (Radiodonta)
The Radiodonta is an extinct order of stem-group arthropods that was successful worldwide during the Cambrian period. They may be referred to as radiodonts, radiodontans, radiodontids, anomalocarids, anomalocaridids, or weirdshrimps, although the last two originally refer to the family Anomalocarididae, which previously included all species of this order but is now restricted to only a few species. Radiodonts are distinguished by their distinctive frontal appendages, which are morphologically diverse and used for a variety of functions. Radiodonts included the earliest large predators known, but they also included sediment sifters and filter feeders.
†Anomalocaris gigantea
†Anomalocaris whiteavesi
†Anomalocaris cranbrookensis
†Anomalocaris daleyae
†Lenisicaris lupata
†Houcaris saron
†Houcaris magnabasis
Nosemouths (Opabiniidae)
The Opabiniidae is an extinct family of marine stem-arthropods. Its type and best-known genus is Opabinia. It also contains Utaurora. Opabiniids closely resemble radiodonts, but their frontal appendages were basally fused into a proboscis. Opabiniids also distinguishable from radiodonts by setal blades covering at least part of the body flaps and serrated caudal rami.
†Opabinia regalis
†Utaurora comosa
?†Myoscolex ateles