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Other unnamed Anomalocaris species are known from China and the United States. [3] Like other radiodonts, Anomalocaris had swimming flaps running along its body, large compound eyes, and a single pair of segmented, frontal appendages, which in Anomalocaris were used to grasp prey.
Anomalocaris was a mainly soft-bodied swimming predator which was gigantic for its time (up to 70 cm = 2¼ feet long; some later species were 3 times as long); the soft, segmented body had a pair of broad fin-like flaps along each side, except that the last 3 segments had a pair of fans arranged in a V shape.
The first known radiodont specimens were collected from the trilobite beds of Mount Stephen by Richard G. McConnell of the Geological Survey of Canada in 1886 [2] or 1888. [81] These specimens were named Anomalocaris canadensis in 1892 by GSC paleontologist Joseph Whiteaves. [81]
There were more than 13,000 lenses in the largest eyes, which were over 3 cm in diameter. The individual lenses were large, with some exceeding 335 μm in diameter, which was possibly an adaptation to seeing in low-light waters. [2] The oral cone was triradial with three large plates, with the plates being studded with numerous tubercules. [1]
At first, scientists thought large swimming arthropods, like the Anomalocaris seen in one of the same rock fossils preserving Burgessomedusa, were the main predators.
Laminacaris size diagram. The large frontal appendage is the most prominent and distinctive feature in Cambrian arthropods. [3] [4] The largest frontal appendage of Laminacaris (YKLP 13338) is around 28 cm (11 in) long, which would have belonged to an individual between 53.2–78.4 cm (20.9–30.9 in) long, based on proportion of Innovatiocaris (which is once treated as "Anomalocaris" saron). [5]
Sebecids were terrestrial crocodiles, meaning they lived and hunted on land. Essentially, Barinasuchus was a land-dwelling predator that was the height of a man, weighed over 3,000 lbs, and was 25 ...
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