1. Adrianov, A.V., Mayorova, A.S., and Malakhov, V.V., Embryonic development of the peanut worm Themiste pyroides (Sipuncula: Sipunculoidea) from the Sea of Japan, Invertebr. Reprod. Dev., 2008, vol. 52, no. 3, pp. 143–151.
2. Agassiz, A., Tornaria, the young stage of Balanoglossus,Am. Nat., vol. 6, pp. 636–637.
3. Aleshin, V.V. and Petrov, N.B., Molecular evidence of regression in the evolution of metazoans, Zh. Obshch. Biol., 2002, vol. 63, no. 3, pp. 195–208.
4. Anderson, D.T., Embryology and Phylogeny of Annelids and Arthropods, Int. Ser. Monogr. Pure Appl. Biol.: Zool., Oxford: Pergamon Press, 1973, no. 50.
5. Arendt, D., Hox genes and body segmentation, Science, 2018, vol. 361, pp. 1310–1311.