6G, H, 12E-H DeMott, 1987, p. 71, pl. Description: Family Odontopleuridae. There are strong axial furrows that are well defined over half the length of the pygidium which continue through the thorax and end on the cephalon as sigmoid curves (curving in then out). The free cheeks are small, sutures reaching the anterior margin at points just posterior to the eyes. The first lateral furrows are straight; the occipital furrow is of moderate depth, the anterior slope is the steeper and shorter. 1, fig. 2; Hall, 1847, p. 238, pl. This is probably due to its very small size and low concentrations, requiring a significant area to be searched to be successful.

64, fig. 38, 49; Emmons, 1842, p. 390, fig. Ecology: The long hypostome of H. striatulus prevented enrollment, but did provide some protection for the ventral surface. Due to the exoskeleton structure, these animals are flexible, mobile, and also well protected. 2, fig. The thorax has 13 segments. 9.4; Whiteley et al., 2002, p. 128, pl. Considered an index fossil if the Sugar River Limestone of the Trenton Group by some authors but is not uniformly distributed. Delo, 1940, p. 110, pl. The eyes of Diacanthaspis are situated near the back of the cheeks and closer to the axis of the cephalon. (credit a: modification of work by Ryan Wilson based on original work by John Henry Comstock; credit b: modification of work by Angel Schatz). An arthropod is an invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages. The pleurae are flat for about one-third of their width, the outer portion being evenly deflected. Hugo Gómez Cerón. 11a, 11b, 12; Evitt and Whittington, 1953, p. 49, pl. 132. The posterior of the cephalon exhibits a long genal spine on either side. 85. 61; Wilson, 1947, p. 43, pl. On the thorax there is a distinct row of 4 or 5 pustules in the interpleural furrow. In order to grow, the arthropod must shed the exoskeleton during a process called ecdysis (“to strip off”); this is a cumbersome method of growth.

Ceraurus pleurexanthemus is a common and widely distributed trilobite of Middle Ordovician, Trenton age rocks in central New York. Phylum Arthropoda. 1, figs. Arthropods include the Hexapoda (insects), the Crustacea (lobsters, crabs, and shrimp), the Chelicerata (the spiders and scorpions), and the Myriapoda (the centipedes and millipedes). 27, no description; Buckland, 1837, p. 73, pl. Proetid Brett et al., 1999, p. 301, fig. Hall, 1847, pl.

The cephalon of Calyptaulax callicephalus is almost twice as wide as it is long and it comes to a blunt point in front. There is also a pair of coarse tubercles aligned on each cheek. The general form is subovate, convex. Copyright © 2020 The President and Fellows of Harvard College.



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