Jon Norenburg

Article

• Curini-Galletti, Marco, Stocchino, Giacinta A., and Norenburg, Jon L. 2019. "New species of Duplominona Karling, 1966 and Pseudominona Karling, 1978 (Platyhelminthes: Proseriata) from the Caribbean." Zootaxa 4657 (1):127–147. https://doi.org/10.11646/zootaxa.4657.1.5
• Zattara, Eduardo E., Fernández-Álvarez, Fernando A., Hiebert, Terra C., Bely, Alexandra E., and Norenburg, Jon L. 2019. "A phylum-wide survey reveals multiple independent gains of head regeneration in Nemertea." Proceedings of the Royal Society B: Biological Sciences 286 (1898):https://doi.org/10.1098/rspb.2018.2524
• Leasi, Francesca, Sevigny, Joseph L., Laflamme, Eric M., Artois, Tom, Curini-Galletti, Marco, de, Jesus Navarrete, Di Domenico, Maikon, Goetz, Freya, Hall, Jeffrey A., Hochberg, Rick, Jörger, Katharina M., Jondelius, Ulf, Todaro, M. A., Wirshing, Herman H., Norenburg, Jon L., and Thomas, W. K. 2018. "Biodiversity estimates and ecological interpretations of meiofaunal communities are biased by the taxonomic approach." Communications Biology 1:112. https://doi.org/10.1038/s42003-018-0119-2
• Mendes, Cecili B., Norenburg, Jon L., Solferini, Vera N., and Andrade, Sónia C. S. 2018. "Hidden diversity: Phylogeography of genus Ototyphlonemertes Diesing, 1863 (Ototyphlonemertidae: Hoplonemertea) reveals cryptic species and high diversity in Chilean populations." PloS One 13 (4):1–22. https://doi.org/10.1371/journal.pone.0195833
• Scarpa, Fabio, Cossu, Piero, Delogu, Valentina, Lai, Tiziana, Sanna, Daria, Leasi, Francesca, Norenburg, Jon L., Curini-Galletti, Marco, and Casu, Marco. 2017. "Molecular support for morphology-based family-rank taxa: The contrasting cases of two families of Proseriata (Platyhelminthes)." Zoologica Scripta 46 (6):753–766. https://doi.org/10.1111/zsc.12251
• Ament-Velásquez, S. L., Figuet, E., Ballenghien, M., Zattara, Eduardo E., Norenburg, Jon L., Fernández-Álvarez, F. A., Bierne, J., Bierne, N., and Galtier, N. 2016. "Population genomics of sexual and asexual lineages in fissiparous ribbon worms (Lineus, Nemertea): hybridization, polyploidy and the Meselson effect." Molecular ecology 25 (14):3356–3369. https://doi.org/10.1111/mec.13717
• Leasi, Francesca, da Silva Andrade, Sonia C., and Norenburg, Jon L. 2016. "At least some meiofaunal species are not everywhere. Indication of geographic, ecological and geological barriers affecting the dispersion of species of Ototyphlonemertes (Nemertea, Hoplonemertea)." Molecular Ecology 25:1381–1397. https://doi.org/10.1111/mec.13568
• Leasi, Francesca, Gaynus, Camille, Mahardini, Angka, Moore, Tiara N., Norenburg, Jon L., and Barber, Paul H. 2016. "Spatial and ecologic distribution of neglected microinvertebrate communities across endangered ecosystems: meiofauna in Bali (Indonesia)." Marine Ecology-an Evolutionary Perspective 37 (5):970–987. https://doi.org/10.1111/maec.12305
• Mendes, Cecili B., Matthews-Cascon, Helena, and Norenburg, Jon L. 2016. "New records of ribbon worms (Nemertea) from Ceará, Northeast Brazil." Zootaxa 4061 (2):146–156. https://doi.org/10.11646/zootaxa.4061.2.4
• Scarpa, Fabio, Cossu, Piero, Sanna, Daria, Lai, Tiziana, Norenburg, Jon L., Curini-Galletti, Marco, and Casu, Marco. 2015. "An 18S and 28S-based clock calibration for marine Proseriata (Platyhelminthes)." Journal of experimental marine biology and ecology 463:22–31. https://doi.org/10.1016/j.jembe.2014.10.020

• Andrade, Sonia C. S., Montenegro, Horácio, Strand, Malin, Schwartz, Megan, Kajihara, Hiroshi, Norenburg, Jon L., Turbeville, James M., Sundberg, Per, and Giribet, Gonzalo. 2014. "A transcriptomic approach to ribbon worm systematics (Nemertea): resolving the Pilidiophora problem." Molecular biology and evolution 31 (12):3206–3215. https://doi.org/10.1093/molbev/msu253
• Chen, Haixia, Sun, Shichun, Norenburg, Jon L., and Sundberg, Per. 2014. "Mutation and selection cause codon usage and bias in mitochondrial genomes of ribbon worms." PLoS One 9 (1):1–11. https://doi.org/10.1371/journal.pone.0085631
• Fonseca, Gustavo, Norenburg, Jon L., and Domenico, Maikon Di. 2014. "Editorial: diversity of marine meiofauna on the coast of Brazil." Marine Biodiversity 1–4. https://doi.org/10.1007/s12526-014-0261-0
• Gonzalez-Cueto, Jaime, Quiroga, Sigmer, and Norenburg, Jon L. 2014. "A shore-based preliminary survey of marine ribbon worms (Nemertea) from the Caribbean coast of Colombia." Zookeys (439): 83–108. https://doi.org/10.3897/zookeys.439.5965
• Leasi, Francesca and Norenburg, Jon L. 2014. "The Necessity of DNA Taxonomy to Reveal Cryptic Diversity and Spatial Distribution of Meiofauna, with a Focus on Nemertea." PLoS ONE 9 (8):1–15. https://doi.org/10.1371/journal.pone.0104385
• Kajihara, Hiroshi, Sun, Shi-Chun, Chernyshev, Alexei V., Chen, Hai-Xia, Ito, Katsutoshi, Asakawa, Manabu, Maslakova, Svetlana A., Norenburg, Jon L., Strand, Malin, Sundberg, Per, and Iwata, Fumio. 2013. "Taxonomic Identity of a Tetrodotoxin-Accumulating Ribbon-worm Cephalothrix simula (Nemertea: Palaeonemertea): A Species Artificially Introduced from the Pacific to Europe." Zoological Science 30 (11):985–997. https://doi.org/10.2108/zsj.30.985
• Martínez, Alejandro, Di Domenico, Maikon, Jörger, Katharina, Norenburg, Jon L., and Worsaae, Katrine. 2013. "Description of three new species of Protodrilus (Annelida, Protodrilidae) from Central America." Marine Biology Research 9 (7):676–691. https://doi.org/10.1080/17451000.2013.765574
• Andrade, Sónia C. S., Strand, Malin, Schwartz, Megan, Chen, Haixia, Kajihara, Hiroshi, von Döhren, Jörn, Sun, Shichun, Junoy, Juan, Thiel, Martin, Norenburg, Jon L., Turbeville, James M., Giribet, Gonzalo, and Sundberg, Per. 2012. "Disentangling ribbon worm relationships: multi‐locus analysis supports traditional classification of the phylum Nemertea." Cladistics 28 (2):141–159. https://doi.org/10.1111/j.1096-0031.2011.00376.x
• Appeltans, Ward, Ahyong, Shane T, Anderson, Gary, Angel, Martin V, Artois, Tom, Bailly, Nicolas, Bamber, Roger, Barber, Anthony, Bartsch, Ilse, Berta, Annalisa, Blazewicz-Paszkowycz, Magdalena, Bock, Phil, Boxshall, Geoff, Boyko, Christopher B, Brandão, Simone Nunes, Bray, Rod A, Bruce, Niel L, Cairns, Stephen D., Chan, Tin-Yam, Cheng, Lanna, Collins, Allen Gilbert, Cribb, Thomas, Curini-Galletti, Marco, Dahdouh-Guebas, Farid, Davie, Peter J F. et al. 2012. "The Magnitude of Global Marine Species Diversity." Current Biology 22 (23):2189–2202. https://doi.org/10.1016/j.cub.2012.09.036
• Chen, Hai-Xia, Sun, Shi-Chun, Sundberg, Per, Ren, Wei-Cheng, and Norenburg, Jon L. 2012. "A comparative study of nemertean complete mitochondrial genomes, including two new ones for Nectonemertes cf. mirabilis and Zygeupolia rubens, may elucidate the fundamental pattern for the phylum Nemertea." BMC Genomics 13 (1):139–139. https://doi.org/10.1186/1471-2164-13-139
• Jörger, Katharina,M., Norenburg, Jon L., Wilson, Nerida G., and Schrödl, Michael. 2012. "Barcoding against a paradox? Combined molecular species delineations reveal multiple cryptic lineages in elusive meiofaunal sea slugs." BMC Evolutionary Biology 12:245. https://doi.org/10.1186/1471-2148-12-245
• Andrade, Sónia C. S., Norenburg, Jon L., and Solferini, Vera N. 2011. "Worms without borders: genetic diversity patterns in four Brazilian Ototyphlonemertes species (Nemertea, Hoplonemertea)." Marine Biology 158 (9):2109–2124. https://doi.org/10.1007/s00227-011-1718-3
• Tulchinsky, Alexander Y., Norenburg, Jon L., and Turbeville, James M. 2011. "Phylogeography of the marine interstitial nemertean Ototyphlonemertes parmula (Nemertea, Hoplonemertea) reveals cryptic diversity and high dispersal potential." Marine Biology 159 (3):661–674. https://doi.org/10.1007/s00227-011-1844-y
• Chen, Haixia, Strand, Malin, Norenburg, Jon L., Sun, Shichun, Kajihara, Hiroshi, Chernyshev, Alexey V., Maslakova, Svetlana A., and Sundberg, Per. 2010. "Statistical Parsimony Networks and Species Assemblages in Cephalotrichid Nemerteans (Nemertea)." PLoS ONE 5 (9):e12885. https://doi.org/10.1371/journal.pone.0012885
• Mahon, Andrew R., Thornhill, Daniel J., Norenburg, Jon L., and Halanych, Kenneth M. 2010. "DNA uncovers Antarctic nemertean biodiversity and exposes a decades-old cold case of asymmetric inventory." Polar Biology 33 (2):193–202. https://doi.org/10.1007/s00300-009-0696-0
• Chen, Hai-Xia, Sundberg, Per, Norenburg, Jon L., and Sun, Shi-Chun. 2009. "The complete mitochondrial genome of Cephalothrix simula (Iwata) (Nemertea: Palaeonemertea)." Gene 442 (1-2):8–17. https://doi.org/10.1016/j.gene.2009.04.015
• Collins, Allen Gilbert, Bentlage, Bastian, Lindner, Alberto, Lindsay, Dhugal, Haddock, Steven H. D., Jarms, Gerhard, Norenburg, Jon L., Jankowski, Thomas, and Cartwright, Paulyn. 2008. "Phylogenetics of Trachylina (Cnidaria: Hydrozoa) with new insights on the evolution of some problematical taxa." Journal of the Marine Biological Association of the United Kingdom 88:1673–1685.
• Maslakova, S. A. and Norenburg, Jon L. 2008. "Revision of the smiling worms, genera Prosadenoporus Burger, 1890 and Pantinonemertes Moore and Gibson, 1981 and description of a new species Prosadenoporus floridensis sp nov (Prosorhochmidae; Hoplonemertea; Nemertea) from Florida and Belize." Journal of Natural History 42 (25-26):1689–1727. https://doi.org/10.1080/00222930802130286
• Maslakova, S. A. and Norenburg, Jon L. 2008. "Revision of the smiling worms, genus Prosorhochmus Keferstein, 1862, and description of a new species, Prosorhochmus belizeanus sp nov (Prosorhochmidae, Hoplonemertea, Nemertea) from Florida and Belize." Journal of Natural History 42 (17-20):1219–1260. https://doi.org/10.1080/00222930801995747
• Thornhill, Daniel J., Mahon, Andrew R., Norenburg, Jon L., and Halanych, Kenneth M. 2008. "Open-ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus (Nemertea: Lineidae)." Molecular ecology 17 (23):5104–5117. https://doi.org/10.1111/j.1365-294X.2008.03970.x
• Dmitrieva, Natalia I., Ferraris, Joan D., Norenburg, Jon L., and Burg, Maurice B. 2006. "The saltiness of the sea breaks DNA in marine invertebrates: possible implications for animal evolution." Cell Cycle 5 (12):1320–1323. https://doi.org/10.4161/cc.5.12.2867
• Kirk, Ritger, Rebecca and Norenburg, Jon L. 2006. "Tubulanus riceae new species (Nemertea: Anopla: Palaeonemertea: Tubulanidae), from South Florida, Belize and Panama." Journal of Natural History 40 (15):931–942. https://doi.org/10.1080/00222930600833867
• Ritger, Rebecca Kirk and Norenburg, Jon L. 2006. "Tubulanus Riceae New Species (Nemertea: Anopla: Palaeonemertea: Tubulanidae), From South Florida, Belize and Panamá." Journal of Natural History (15-16): 931–942. https://doi.org/10.1080/00222930600833867
• Santos, C., Bueno, L. S., and Norenburg, Jon L. 2006. "Infestation by Carcinonemertes divae (Nemertea: Carcinonemertidae) in Libinia spinosa (Decapoda: Pisidae) from Sao Sebastiao Island, SP, Brazil." Journal of Natural History 40 (15-16):999–1005. https://doi.org/10.1080/00222930600834105
• Santos, C., Norenburg, Jon L., and Bueno, L. S. 2006. "Three new species of Carcinonemertes (Nemertea, Carcinonemertidae) from the southeastern coast of Brazil." Journal of Natural History 40 (15-16):915–930. https://doi.org/10.1080/00222930600833842
• Collin, Rachel, Diaz, Maria Cristina, Norenburg, Jon L., Rocha, R. M., Sanchez, Juan A., Schulz, A., Schwartz, Megan L., and Valdes, A. 2005. "Photographic Identification Guide to Some Common Marine Invertebrates of Bocas Del Toro, Panamá." Caribbean Journal of Science 41 (3):638–707.
• Maslakova, S. A., Norenburg, Jon L., Thiel, Martin, and Vásquez, N. 2005. "Redescription of Amphiporus nelsoni Sanchez 1973 (Nemertea: Hoplonemertea: Amphiporidae) with a change of its taxonomic status." Proceedings of the Biological Society of Washington 118 (3):483–496.
• Schwartz, Megan L. and Norenburg, Jon L. 2005. "Three New Species of Micrura (Nemertea: Heteronemertea) and a New Type of Heteronemertean Larva From the Caribbean Sea." Caribbean Journal of Science 41 (3):528–543.
• Maslakova, S. A., Martindale, M. Q., and Norenburg, Jon L. 2004. "Fundamental properties of the spiralian developmental program are displayed by the basal nemertean Carinoma tremaphoros (Palaeonemertea, Nemertea)." Developmental biology 267:342–360.
• Maslakova, S. A., Martindale, M. Q., and Norenburg, Jon L. 2004. "Vestigial prototroch in a basal nemertean, Carinoma tremaphoros (Nemertea; Palaeonemertea)." Evolution & Development 6 (4):219–226.
• Thollesson, M. and Norenburg, Jon L. 2003. "Ribbon worm relationships: a phylogeny of the phylum Nemertea." Proceedings of the Royal Society B: Biological Sciences 270:407–415.
• Ivanov, V. A., Bigatti, G., Penchaszadeh, P. E., and Norenburg, Jon L. 2002. "Malacobdella arrokeana (Nemertea: Bdellonemertea), a new species of nemertean from the southwestern Atlantic Ocean entocommensal in Panopea abbreviata (Bivalvia, Heterodonta, Hiatellidae) in Argentina." Proceedings of the Biological Society of Washington 115:359–367.
• Envall, M. and Norenburg, Jon L. 2001. "Morphology and phylogenetics in mesopsammic nemerteans of the genus Ototyphlonemertes (Nemertea, Hoplonemertea, Ototyphlonemertidae)." Hydrobiologia 456:145–163.
• Maslakova, S. A. and Norenburg, Jon L. 2001. "Trochophore larva is plesiomorphic for nemerteans: evidence for prototroch in a basal nemertean Carinoma tremaphoros (Phylum Nemertea, Palaeonemertea)." American Zoologist 41 (6):289.
• Maslakova, S. A. and Norenburg, Jon L. 2001. "Phylogenetic study of pelagic nemerteans (Pelagica, Polystilifera)." Hydrobiologia 456:111–132.
• Roe, Pamela and Norenburg, Jon L. 2001. "Morphology and taxonomic distribution of a newly discovered feature, postero-lateral glands, in pelagic nemerteans." Hydrobiologia 456:133–144.
• Schwartz, M. L. and Norenburg, Jon L. 2001. "Can we infer heteronemertean phylogeny from available morphological data?." Hydrobiologia 456:165–174.
• Stricker, S. A., Smythe, T. L., Miller, L., and Norenburg, Jon L. 2001. "Comparative biology of oogenesis in nemertean worms." Acta Zoologica 82:213–230.
• Maslakova, S. A., Martindale, M. Q., and Norenburg, Jon L. 2000. "Remains of the Pilidium in Direct Developing Nemerteans?." American Zoologist 40:1119.
• Newman, L., Norenburg, Jon L., and Reed, Sherry A. 2000. "Taxonomic and biological observations on the tiger flatworm, Maritigrella crozieri (Hyman, 1939), new combination (Platyhelminthes, Polycladida, Euryleptidae) from Florida waters." Journal of Natural History 34:799–808.
• Maslakova, S. A., Malakhov, V. V., and Norenburg, Jon L. 1999. "Indirect Development in the Order Hoplonemertea (Phylum Nemertea)." American Zoologist 39:222.
• Roe, Pamela and Norenburg, Jon L. 1999. "Observations on depth distribution, diversity and abundance of pelagic nemerteans from the Pacific Ocean off California and Hawaii." Deep-Sea Research 46 (1):1201–1220.
• Schwartz, M. L. and Norenburg, Jon L. 1999. "Problems inferring coelomate protostome phylogeny from elongation factor 1 alpha sequence data." American Zoologist 39 (5):44A.
• Crandall, Frank B., Norenburg, Jon L., and Gibson, R. 1998. "Gonadogenesis, embryogenesis, and unusual oocyte origin in Notogaeanemertes folzae Riser, 1988 (Nemertea, Hoplonemertea)." Hydrobiologia 365:93–107.
• Feller, R. J., Roe, Pamela, and Norenburg, Jon L. 1998. "Dietary immunoassay of pelagic nemerteans by use of cross-reacting polyclonal antibodies: preliminary findings." Hydrobiologia 365:263–269.
• Norenburg, Jon L. and Maslakova, S. A. 1998. "Preliminary cladistic analysis of holopelagic polystiliferan nemerteans." American Zoologist 38:138A.
• Norenburg, Jon L. and Roe, Pamela. 1998. "Reproductive biology of several species of recently collected pelagic nemerteans." Hydrobiologia 365:73–91.
• Norenburg, Jon L. and Roe, Pamela. 1998. "Observations on musculature in pelagic nemerteans and on pseudostriated muscle in nemerteans." Hydrobiologia 365:109–120.
• Rogers, A. D., Thorpe, J. P., Gibson, R., and Norenburg, Jon L. 1998. "Genetic differentiation of populations of the common intertidal nemerteans Lineus ruber and Lineus viridis (Nemertea, Anopla)." Hydrobiologia 365:1–11.
• Ferraris, Joan D. and Norenburg, Jon L. 1997. "Volume and ion regulation during repeated exposure to temperature changne: Physiological divergence in Trans-Isthmain cognate pairs and latitudinally distant populations of decapod curstacea." Marine Ecology 18 (3):193–209.
• Ferraris, Joan D. and Norenburg, Jon L. 1997. "Oxygen uptake during repeated exposure to temperature change: Pysiological divergence in Panamanian cognate pairs and latitudinally distant populations of decapod Crustacea." Marine Ecology 18 (2):127–146.
• Richards, C. T., Norenburg, Jon L., and Crandall, F. C. 1997. "Phylogenetics, slime and the genus Pantinonemertes (Nemertea)." American Zoologist 37:198A.
• Norenburg, Jon L. 1996. "First record of the terrestrial species Geonemertes pelaensis (Nemertea: Hoplonemertea) in Hawaii." Bishop Museum Occasional Papers 46:21.
• Norenburg, Jon L., Rogers, A. D., Bustasmante, C., and Ferraris, Joan D. 1994. "Molecular phylogeny in species of the nemertean genus Lineus." American Zoologist 34:97A.
• Roe, Pamela and Norenburg, Jon L. 1994. "Aspects of occurence and reproductive biology of two deep sea pelagic nemerteans off California." Unpublished abstract for presentation at the Annual Meeting of the Western Society of Naturalists 000.
• Norenburg, Jon L. 1993. "Riserius pugetensis gen. n., sp. n. (Nemertina: Anopla), a new mesopsammic species, and comments on phylogenetics of some anoplan characters." Hydrobiologia 266:203–218.
• Reynolds, P. D., Morse, M. P., and Norenburg, Jon L. 1993. "Ultrastructure of the heart and pericardium of a neomeniomorph aplacophoran (solenogastre) mollusc: evidence for ultrafiltration of blood." Proceedings of the Royal Society B: Biological Sciences 254:147–152.
• Reynolds, P. D. and Norenburg, Jon L. 1993. "Ultrastructure of the heart and pericardium of an aplacophoran mollusc (Neomeniomorpha): evidence for ultrafiltration of blood." Proceedings of the Royal Society B: Biological Sciences 147–152.
• Roe, Pamela and Norenburg, Jon L. 1993. "Pelagic nemertines of the northern Pacific revisited." American Zoologist 33 (5):47A.
• Morse, M. P. and Norenburg, Jon L. 1992. "Observations on and redescription of Meiomenia arenicola Salvini-Plawen, 1985 (Mollusca: Aplacophora)." Proceedings of the Biological Society of Washington 105:674–682.
• Norenburg, Jon L., Crandall, Frank B., and White, A. 1992. "New supra-littoral hoplonemertines from Florida." American Zoologist 32:136a.
• Norenburg, Jon L. and Ferraris, Joan D. 1990. "Cytomorphology of the pedal aperture glands in Mya arenaria L." Canadian Journal of Zoology 1990:1137–1144.
• Ferraris, Joan D. and Norenburg, Jon L. 1988. "Water and solute regulation in Procephalothrix spiralis Coe and Clitellio arenarius (M_ller). III. Long-term acclimation to diluted seawaters and effect of putative neuroendocrine structures." Hydrobiologia 156:161–173.
• Norenburg, Jon L. 1988. "Phylogenesis of the phylum Nemertina." American Zoologist 28:150A.
• Norenburg, Jon L. 1988. "Remarks on marine interstitial nemertines and key to the species." Hydrobiologia 156:87–92.
• Norenburg, Jon L. 1987. "A new old, mesopsammic nemertine?." American Zoologist 27:41A.
• Norenburg, Jon L. and Barrett, J. M. 1987. "Steedman's Polyester Wax embedment for combined light and scanning electron microscopy." Journal Electron Microscopic Technics 6:35–41.
• Norenburg, Jon L. 1986. "Redescription of a brooding nemertine, Cyanophthalma obscura gen. n., comb. n. (Schultz, 1851), with observations on its biology and discussion of the species of Prostomatella and related taxa." Zoologica Scripta 15:275–293.
• Norenburg, Jon L. 1985. "Structure of the nemertine integument with consideration of its ecological and phylogenetic significance." American Zoologist 25:37–51.
• Norenburg, Jon L. 1985. "Structure of the pedal aperture glands in Mya arenaria." American Zoologist 25:110A.
• Norenburg, Jon L., Barrett, J. M., and Schmidt-Nielsen, B. 1985. "Steedman's polyester wax as a tool in correlated LM and SEM of mammalian kidney." Proceedings Southeastern Electron Microscope Society 8:11.
• Roe, Pamela and Norenburg, Jon L. 1985. "Introduction to the symposium: Comparative biology of nemertines." American Zoologist 25:3.
• Morse, M. P. and Norenburg, Jon L. 1983. "A molluscan interstitial assemblage at Fort Pierce, Florida." American Zoologist 23:931.
• Norenburg, Jon L. and Morse, M. Patricia. 1983. "Systematic implications of Euphysa ruthae n. sp. (Athecata, Corymorphidae) a psammophilic solitary hydroid with unusual morphogenesis." Transactions of the American Microscopical Society 102 (1):1–17.
• Norenburg, Jon L. 1982. "A Euphysa hydroid that has statocysts and forms buds with reversed polarity." American Zoologist 22:939.
• Norenburg, Jon L. 1981. "Interstitial nemertines and their distribution." American Zoologist 21:989.
• Norenburg, Jon L. 1980. "Comparative morphology of the nemertine integument." American Zoologist 20:751.

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