Budd, G. E.; Jensen, S. (May 2000). "A critical reappraisal of the fossil record of the bilaterian phyla". Biological Reviews of the Cambridge Philosophical Society. 75 (2): 253–95. doi:10.1111/j.1469-185X.1999.tb00046.x. PMID10881389. S2CID39772232.
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Dunn, C. W.; Hejnol, A.; Matus, D. Q.; Pang, K.; Browne, W. E.; Smith, S. A.; Seaver, E.; Rouse, G. W.; Obst, M. (10 April 2008). "Broad Phylogenomic Sampling Improves Resolution of the Animal Tree of Life". Nature. 452 (7188): 745–749. Bibcode:2008Natur.452..745D. doi:10.1038/nature06614. PMID18322464. S2CID4397099.
Shirley, Thomas C.; Storch, Volker (1999). "Halicryptus higginsi n.sp. (Priapulida): A Giant New Species from Barrow, Alaska". Invertebrate Biology. 118 (4): 404–413. doi:10.2307/3227009. JSTOR3227009.
Higgins, Robert P.; Storch, Volker (January 1991). "Evidence for Direct Development in Meiopriapulus fijiensis (Priapulida)". Transactions of the American Microscopical Society. 110 (1): 37–46. doi:10.2307/3226738. JSTOR3226738.
nih.gov
pubmed.ncbi.nlm.nih.gov
Budd, G. E.; Jensen, S. (May 2000). "A critical reappraisal of the fossil record of the bilaterian phyla". Biological Reviews of the Cambridge Philosophical Society. 75 (2): 253–95. doi:10.1111/j.1469-185X.1999.tb00046.x. PMID10881389. S2CID39772232.
Dunn, C. W.; Hejnol, A.; Matus, D. Q.; Pang, K.; Browne, W. E.; Smith, S. A.; Seaver, E.; Rouse, G. W.; Obst, M. (10 April 2008). "Broad Phylogenomic Sampling Improves Resolution of the Animal Tree of Life". Nature. 452 (7188): 745–749. Bibcode:2008Natur.452..745D. doi:10.1038/nature06614. PMID18322464. S2CID4397099.
Budd, G. E.; Jensen, S. (May 2000). "A critical reappraisal of the fossil record of the bilaterian phyla". Biological Reviews of the Cambridge Philosophical Society. 75 (2): 253–95. doi:10.1111/j.1469-185X.1999.tb00046.x. PMID10881389. S2CID39772232.
Oeschger, R.; Janssen, H. H. (September 1991). "Histological studies on Halicryptus spinulosus (Priapulida) with regard to environmental hydrogen sulfide resistance". Hydrobiologia. 222: 1–12. doi:10.1007/BF00017494. S2CID31342308.
Dunn, C. W.; Hejnol, A.; Matus, D. Q.; Pang, K.; Browne, W. E.; Smith, S. A.; Seaver, E.; Rouse, G. W.; Obst, M. (10 April 2008). "Broad Phylogenomic Sampling Improves Resolution of the Animal Tree of Life". Nature. 452 (7188): 745–749. Bibcode:2008Natur.452..745D. doi:10.1038/nature06614. PMID18322464. S2CID4397099.