Zoogeography of the echiuran fauna of the East Pacific Ocean (Phylum: Echiura) Author Biseswar, Ramlall text Zootaxa 2012 3479 69 76 journal article 44404 10.5281/zenodo.282351 b91f67d2-9672-4546-bc03-a70a0c4422fe 1175-5326 282351 D097E1C5-37F3-45F7-8022-3C063B2A667D Subfamily Thalassematinae Description. Rings of setae around the posterior or anal region of the trunk lacking. Proboscis long and truncate. Post-pharyngeal diaphragm absent. Genus Anelassorhynchus Annandale, 1922 Description. Posterior setae absent. Longitudinal and inner oblique layers of muscle not grouped into bands or fascicles. Gonostomal lips elongate and spirally coiled.