Notable sports deaths in 2016. A look at those athletes, coaches and sports personalities we lost in 2016. Keion Carpenter. Keion Carpenter, a former NFL player and Virginia Tech defensive back and special teams standout died Thursday, Dec. 29, 2016 in Miami, the school announced. He was 39 and the cause of death is unknown.
Members of the phylum Chordata are bilaterally symmetric, deuterostome coelomates, and the vertebrate chordates display segmentation. Hemichordata, which includes the acorn worms, has been presented as a fourth chordate subphylum, but it now is usually treated as a separate phylum. It, along with the phylum Echinodermata, which includes starfish, sea urchins, sea cucumbers and their kin, are the chordates' closest relatives.
However, in addition to the subphylum Vertebrata, the phylum Chordata also contains two subphylums of invertebrates: Urochordata and Cephalochordata. Members of these groups also possess the four distinctive features of chordates at some point during their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.