Eibye-Jacobsen (2001). "Are the supportive structures of the tardigrade pharynx homologous throughout the entire group?". Journal of Zoological Systematics and Evolutionary Research. 39: 1. doi:10.1046/j.1439-0469.2001.00140.x.
Elzinga, R. J. (1998). "Microspines in the alimentary canal of arthropoda, onychophora, annelida". International Journal of Insect Morphology and Embryology. 27 (4): 341. doi:10.1016/S0020-7322(98)00027-0.
Morse, M. Patricia (1981). "Meiopriapulus fijiensis n. gen., n. sp.: An Interstitial Priapulid from Coarse Sand in Fiji". Transactions of the American Microscopical Society. 100 (3): 239. doi:10.2307/3225549. JSTOR3225549.
jstor.org
Morse, M. Patricia (1981). "Meiopriapulus fijiensis n. gen., n. sp.: An Interstitial Priapulid from Coarse Sand in Fiji". Transactions of the American Microscopical Society. 100 (3): 239. doi:10.2307/3225549. JSTOR3225549.