"Telosentis" is a genus of acanthocephalans. The acanthocephalans "Acanthocephaloides propinquus" are most numerous. The cobia is frequently parasitized by nematodes, trematodes, cestodes, copepods, and acanthocephalans. The killdeer is parasitized by acanthocephalans, cestodes, nematodes, and trematodes. Parasites of millipedes include nematodes, phaeomyiid flies, and acanthocephalans. Parasites of Atlantic cod include copepods, digeneans, monogeneans, acanthocephalans, cestodes, nematodes, myxozoans, and protozoans. Acanthocephalans lack a mouth or alimentary canal. There are several morphological characteristics that distinguish acanthocephalans from other phyla of parasitic worms. However, most other acanthocephalans have infective larvae that more closely resemble underdeveloped adult worms. In acanthocephalans, adult males have cement glands in their posterior ends. In some recent treatments, rotifers are placed with acanthocephalans in a larger clade called Syndermata. Acanthocephalans do not have digestive tracts and absorb nutrients through the tegument, the external layer.