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Observations on the morphology of some North American nemertines with consequent taxonomic changes and a reassessment of the architectonics of the phylum

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Abstract

A majority of the nemertine species from the western North Atlantic were originally described from life in the nineteenth century. Many of these were established by A. E. Verrill who had ‘an eye for species’ no matter which phylum he was working with, and thus when living nemertines which he described are encountered, they can usually be recognized. The morphology of most of these species has never been reported; some may prove to be species described earlier from the eastern North Atlantic. Morphological observations on the nemertine species from the North East coast of the Pacific are inadequate and have prevented satisfactory comparison with species from Japan and eastern Russia. The morphology of some species collected in the Gulf of Maine and from Cape Cod, as well as a re-examination of some of the slides of type specimens of species from the west coast of North America, indicates that their generic placement must be re-examined. The architectonic plan of the heteronemertines postulated over 100 years ago can not be substantiated and is redescribed. Three new heteronemertean genera are described: Tenuilineus gen.n. Parvicirrus gen.n., Tarrhomyos gen.n.

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References

  1. Bierne, J., M. Tarpin & G. Vernet, 1993. A reassessment of the systematics and a proposal for the phylogeny of some cosmopolitan Lineus species (Nemertea). Hydrobiologia 266: 159–168.

  2. Brunberg, L., 1964. On the nemertean fauna of Danish waters. Ophelia 1: 77–111.

  3. Bürger, O., 1895. Die Nemertine des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. Fauna und Flora des Golfes von Neapel, 22: 1–743.

  4. Bürger, O., 1897–1907. Nemertini (Schnurwürmer). In H. G. Bronn (ed), Klassen und Ordnungen des Tierreichs. Supplement. 4: 542 pp.

  5. Bürger, O., 1904. Nemertini. Das Tierreich, 20: 1–151.

  6. Cantell, C.-E., 1975. Anatomy, taxonomy and biology of some Scandinavian heteronemertines of the genera Lineus, Micrura, and Cerebratulus. Sarsia 58: 89–122.

  7. Cantell, C.-E., 1982. The anatomy and taxonomy of Cerebratulus praealbescens sp. n. (Nemertini) from the west coast of Sweden and Norway. Sarsia 67: 11–20.

  8. Coe, W. R., 1895. On the anatomy of a species of nemertean (Cerebratulus lacteus Verrill), with remarks on certain other species. Trans. Conn. Acad. Arts Sci. 9: 479–514.

  9. Coe, W. R., 1901. Papers from the Harriman Alaska Expedition. XXI The nemerteans. Proc. Wash. Acad. Sci. 3: 1–110.

  10. Coe, W. R., 1905. Nemerteans of the west and northwest coasts of America. Bull. Mus. Comp. Zool., Harvard College. 47: 1–319.

  11. Coe, W. R., 1943. Biology of the nemerteans of the Atlantic coast of North America. Trans. Conn. Acad. Arts Sci. 35: 129–328.

  12. Correa, D. D., 1961. Nemerteans from Florida and Virgin Islands. Bull. Mar. Sci. Gulf Carribb. 11: 1–44.

  13. Friedrich, H., 1933. Morphologische Studien an Nemertinea der Kieler Bucht, I und II. Z. Wiss. Zool. 144: 496–509.

  14. Friedrich, H., 1935. Studien zur Morphologie, Systematik und Ökologie der Nemertinen der Kieler Bucht. Arch. f. naturgesch. N.F. 4: 293–375.

  15. Friedrich, H., 1960. Bemerkungen über die Gattung Micrura Ehrenberg 1831 und zur Klassifikation der Heteronemertinen nebst vorläufigen Bestimmungsschlussel. Veroff. Inst. Mceresforsch. Bremerh. 7: 48–62.

  16. Gibson, R., 1972. Nemerteans. Hutchinson, London, 224 pp.

  17. Gibson, R., 1982. Nemertea. In: Parker S. P. (ed.), Synopsis and Classification of Living Organisms. McGraw-Hill, New York: 823–846.

  18. Gibson, R., 1985. The need for a standard approach to taxonomic descriptions of nemerteans. Am. Zool. 25: 5–14.

  19. Gibson, R., 1990. The macrobenthic nemertean fauna of Hong Kong. In Morton, B.S. (ed.) Proceedings of the Second International Marine Biological Workshop: The Marine Flora and Fauna of Hong Kong and Southern China. Hong Kong Univ. Press, Hong Kong. 1: 33–212.

  20. Gibson, R. & F. B. Crandall, 1989. The genus Amphiporus Ehrenberg (Nemertea, Enopla, Monostiliferoidea) Zool. Scr. 18: 453–470.

  21. Girard, C., 1855. Nemertidae. In W. Stimpson, Synopsis of the Marine Invertebrata of Grand Manan. Smithson. Contrib. Knowl. 6: 28

  22. Gontcharoff, M., 1961. Embranchment des Nemertiens (Nemertini G. Cuvier 1817; Rhynchocoela M. Schultze 1851). In P.-P. Grassé (Dir.) Traité de Zoologie. Anatomie, Systematique, Biologic 4: 785–886

  23. Hubrecht, A. A. W., 1887. Report on the Nemertea collected by H.M. S. ‘Challenger’ during the years 1873–6. Challenger Report, Zoology, 90: 1–151.

  24. Hyman, L. H., 1951. The Invertebrates: Platyhelminthes and Rhynchocoela, The Acoelomate Bilateria. McGraw-Hill, New York. 550 pp.

  25. Iwata, F., 1958. On the development of the nemertean Micrura akkeshiensis. Embryologia 4: 103–131.

  26. Iwata, F., 1972. Axial changes in the nemertean egg and embryo during development and its phylogenetic significance. J. Zool. London 168: 521–526.

  27. Iwata, F., 1985. Foregut formation of the nemerteans and its role in nemertean systematics. Am. Zool. 25: 23–36.

  28. Iwata, F., 1993. Paralineopsis taki gen. et sp. nov., a littoral heteronemertean from Japan, provided with special proboscideal, circulatory and sensory organs of significance to nemertean systematics. Hydrobiologia 266: 185–201.

  29. Norenburg, J. L., 1985. Structure of the nemertine integument with consideration of its ecological and phylogenetic significance. Am. Zool. 25: 37–51.

  30. Norenburg, J. L., 1986. Redescription of a brooding nemertine, Cyanophthalma obscura (Schultze) gen. et comb.n., with observations on its biology and discussion of the species of Prostomatella and related taxa. Zool. Scr. 15: 275–296.

  31. Norenburg, J. 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.

  32. Oudemans, A. C., 1885. The circulatory and nephridial apparatus of the Nemertea. Q. J. Micro. Sci. Suppl. 25: 180.

  33. Pedersen, K. J. 1968. Some morphological and histochemical aspects of nemertean connective tissue. Z. Zellforsch. 90: 570–595.

  34. Pedersen, K. J., 1991. Structure and composition of basement membranes and other basal matrix systems in selected invertebrates. Acta zool., Stockh. 72: 181–201.

  35. Riser, N. W., 1987. Observations on the genux Ophelia (Polychaeta: Opheliidae) with the description of a new species. Ophelia 28: 11–29.

  36. Riser, N. W., 1989. Speciation and time-relationship of the nemertines to the acoelomate metazoan bilateria. Bull. Mar. Sci. 45: 531–538.

  37. Riser, N. W., 1990. New Zealand nemertines from kelp holdfasts: Heteronemertinea 1. Adenorhagas aurantiafrons gen.n., sp.n. N. Z. J. Zool. 17: 597–606.

  38. Riser, N. W., 1991. New Zealand nemertines from kelp holdfasts: Heteronemertinea II. Notospermus geniculatus (Delle Chiaje, 1828) n.comb. N. Z. J. Zool. 18: 427–438.

  39. Stiasny-Wynhoff, G., 1923. Die Entstehung des Kopfes bei den Nemertinen. Acta Zool. 4: 223–240.

  40. Storch, V. & K. Moritz, 1971. Zur Feinstruktur der Sinnesorgane von Lineus ruber O.F. Müller (Nemertini, Heteronemertini). Z. Zellforsch. 117: 212–225.

  41. Verrill, A. E., 1873. Report upon the invertebrate animals of Vineyard Sound and the adjacent water, with an account of the physical characters of the region. Rep. U.S. Comm. Fish & Fisheries for 1871 and 1872: 295–778.

  42. Verrill, A. E., 1874a. Brief contributions to Zoology from the Museum of Yale College. No. XXVI. Results of recent dredging expeditions on the coast of New England. Am. J. Sci. Ser. 3 7: 38–46.

  43. Verrill, A. E., 1874b. Brief contributions to Zoology from the Museum of Yale College. No. XXVIII. Results of recent dredging expeditions on the coast of New England. Am. J. Sci. Ser. 3 7: 405–414.

  44. Verrill, A. E., 1879. Notice of recent additons to the marine invertebrata of the northeastern coast of America, with descriptions of new genera and species and critical remarks on others. Proc. U.S. Nat. Mus. 79: 165–206.

  45. Verrill, A. E., 1892. The marine nemerteans of New England and adjacent waters. Trans. Conn. Acad. Arts Sci. 8: 382–456.

  46. Verrill, A. E., 1895. Supplement to the marine nemerteans and planarians of New England. Trans. Conn. Acad. Arts Sci. 9: 523–534.

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Riser, N.W. Observations on the morphology of some North American nemertines with consequent taxonomic changes and a reassessment of the architectonics of the phylum. Hydrobiologia 266, 141–157 (1993). https://doi.org/10.1007/BF00013364

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Key words

  • Nemertea
  • North America
  • taxonomy
  • Tenuilineus
  • Parvicirrus
  • Tarrhomyos