, Volume 95, Issue 1, pp 41–84 | Cite as

A new group of interstitial worms, Lobatocerebridae nov. fam. (Annelida) and its significance for metazoan phylogeny

  • R. M. Rieger


This is the first paper of a series dealing with the new interstitial, monotypic family Lobatocerebridae. The single genusLobatocerebrum is described as a turbellariomorph taxon in the annelid line of evolution. The male genital system, the protonephridial system, the body wall and the anus-hindgut system reveal the most important characteristics for the determination of its phylogenetic position. Although presently the group can not be clearly aligned with any of the classes within the Annelida, the new family is provisionally included into the Oligochaeta, until further, yet undescribed species of this group will reveal better the within-group characterconsistency. Because of the high degree of superficial similarities to the Turbellaria (acoelomate body cavity, complete ciliation, lack of signs of segmentation, special features of the foregut, arrangement of reproductive organs) this paper argues that the Lobatocerebridae may become an important example for trying to understand the origin and evolution of acoelomate flatworms from coelomate ancestors.


Developmental Biology Genital System Reproductive Organ Body Wall Phylogenetic Position 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations Used in Figures


adhesive organ


basal granule cell


basal cell granules system


basement membrane




circular muscle fibers


cyanophilous glands of male gonopore


commissure between lateral nerves






frontal gland






intercellular lacunae filled with dense matrix


lobus caudalis major


lobus caudalis minor


longitudinal muscle bands


lateral nerve chords


lobus rostralis


muscle fibers


regular mucous gland


male genital canal


mesenchymal cells


male gonopore


mouth opening


small nerve bundles


neurosecretory cell


neuroglia cell










post-buccal ganglia


post-cerebral ganglion




pharyngeal glands


longitudinal pharynx muscle




radial muscles on pharynx




sphincter system at mouth opening


first circular muscle band


second circular muscle band


U-shaped muscle band on pharynx


sphincter at oesophagus


anal sphincter


seminal receptacle




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  1. Antonius, A.: Methodischer Beitrag zur mikroskopischen Anatomie und graphischen Rekonstruktion sehr kleiner zoologischer Objekte. Mikroskopie20, 145–153 (1965)Google Scholar
  2. Ax, P.: Die Gnathostomulida, eine rätselhafte Wurmgruppe aus dem Meeressand. Abh. Akad. Wiss. Mainz Math.-Naturw. Kl.8, 1–32 (1956)Google Scholar
  3. Ax, P.: Relationships and phylogeny of the Turbellaria. In: The lower Metazoa (E.C. Dougherty, ed.), pp. 191–224. Berkeley and Los Angeles: University of California Press 1963Google Scholar
  4. Ax, P.: Die Bedeutung der interstitiellen Sandfauna für allgemeine Probleme der Systematik, Öko-logie und Biologie. Veröff. Inst. Meeresforsch. Bremerhaven2, 15–66 (1966)Google Scholar
  5. Ax, P., Dörjes, J.:Oligochoerus limnophilus nov. spec., ein kaspisches Faunenelement als erster Süßwasservertreter der Turbellaria Acoela in Flüssen Mitteleuropas. Int. Rev. Ges. Hydrobiol.51, 15–44 (1966)Google Scholar
  6. Bedini, C., Papi, J.: Fine structure of the turbellarian epidermis. In: Biology of the Turbellaria, Libbie H. Hyman Mem. (N.W. Riser, M.P. Morse, eds.). McGraw-Hill 1974Google Scholar
  7. Borkott, H.: Geschlechtliche Organisation, Fortpflanzungsverhalten und Ursachen der sexuellen Vermehrung vonStenostomum sthenum nov. spec. (Turbellaria Catenulida). Z. Morphol. Tiere67, 183–262 (1970)Google Scholar
  8. Bowen, I.D., Ryder, T.A.: The fine structure of the planarianPolycelis tennis (Ijima) III. The epidermis and external features. Protoplasma80, 381–392 (1974)Google Scholar
  9. Brandenburg, J.: Die Reusenzelle (Cyrtocyte) desDinophilus (Archiannelida). Z. Morphol. Tiere68, 83–92 (1970)Google Scholar
  10. Bullock, T.H., Horridge, G.A.: Structure and Function in the Nervous Systems of Invertebrates. Vol. 1. San Francisco: W.H. Freeman & Co. 1965Google Scholar
  11. Bunke, D.: Zur Morphologie und Systematik der Aeolosomatidae Beddard 1895 und Potamodrilidae nov. fam. (Oligochaeta). Zool. Jb. Abt. Syst. Oekol. Geogr. Tiere94, 187–368 (1967)Google Scholar
  12. Chien, P.K., Koopowitz, H.: Ultrastructure of the nerve plexus in flatworms: III The Infra-epithelial nervous system. Cell Tissue Res.176, 335–347 (1977)Google Scholar
  13. Clark, R.B.: Systematics and phylogeny: Annelida, Echiura, Sipuncula. Chem. Zool.4, 1–68 (1969)Google Scholar
  14. Coull, B.C., Ellison, R.L., Fleeger, J.W., Higgins, R.P., Hope, W.D., Hummon, W.D., Rieger, R.M., Sterrer, W.E., Thiel, H., Tietjen, J.H.: Quantitative estimates of the meiofauna from the deep sea off North Carolina. Mar. Biol.39, 233–240 (1977)Google Scholar
  15. Crawford, B.J., Chia, F.-S.: Fine structure of the mucous cell in the sea pen,Ptilosarcus guerneyi, with special emphasis on the possible role of microfilaments in the control of mucous release. Can. J. Zool.52, 1427–1432 (1974)Google Scholar
  16. Crezée, M., Tyler, S.:Hesiolicium gen. n. (Turbellaria Acoela) and observations on its ultrastructure. Zool. Scripta.5, 207–216 (1976Google Scholar
  17. Dales, R.P.: Annelids. London: Hutchinson & Co. 1963Google Scholar
  18. Doe, D.A.: Comparative ultrastructure of the pharynx simplex in Turbellaria. Ph.D. Thesis, University of North Carolina, 157 pp. 1978Google Scholar
  19. Doe, D.A., Rieger, R.M.: A new species of the genusRetronectes (Turbellaria, Catenulida) from the coast of North Carolina, U.S.A. Mikrofauna Meeresboden66, 1–10 (1977)Google Scholar
  20. Dorey, A.E.: The organization and replacement of the epidermis in acoelous turbellarian. Q. J. Microsc. Sci.106, 147–172 (1964)Google Scholar
  21. Dörjes, J.:Paratomella unichaeta nov. gen. nov. spec. Vertreter einer neuen Familie der Turbellaria Acoela mit asexueller Fortpflanzung durch Paratomie. Veröff. Inst. Meeresforsch. Bremerhaven2, 187–200 (1966)Google Scholar
  22. Dörjes, J.: Die Acoela (Turbellaria) der Deutschen Nordseeküste und ein neues System der Ordnung. Z. Zool. Syst. Evolutionsforsch.6, 56–452 (1968)Google Scholar
  23. Dörjes, J.: Monographie der Proporidae und Solenofilomorphidae (Turbellaria Acoela). Senckenbergiana52, 113–137 (1971)Google Scholar
  24. Dorsett, D.A., Hyde, R.: The epidermal gland of Nereis. Z. Zellforsch. Mikrosk. Anat.110, 219–230 (1970a)Google Scholar
  25. Dorsett, D.A., Hyde, R.: The spiral glandsof Nereis. Z. Zellforsch. Mikrosk. Anat.110, 204–218 (1970b)Google Scholar
  26. Eakin, R.M., Martin, G.G., Reed, C.T.: Evolutionary significance of fine structure of archiannelid eyes. Zoomorphologie88, 1–18 (1977)Google Scholar
  27. Engster, M.S., Brown, S.C.: Histology and ultrastructure of the tube foot epithelium in the phanerozonian starfish, Astropecten. Tissue Cell4, 503–518 (1972)Google Scholar
  28. Fauchald, K.: Polychaete phylogeny: a problem in protostome evolution. Syst. Zool.23, 493–506 (1974)Google Scholar
  29. Fauchald, K.: The polychaete worms: definitions and keys to the Orders, Families and genera. Nat. Hist. Mus. Los Angeles, Sci.28, 188 1977Google Scholar
  30. Faubel, A., Dörjes, J.:Flagellophora apelti gen. n., sp. n: A remarcable, (sic) representative of the Order Nemertodermatida (Turbellaria: Archoophora). Senckenbergiana10, 1–13 (1978)Google Scholar
  31. Franzen, A.: Phylogenetic aspects of the morphology of spermatozoa and spermiogenesis. In: Comparative Spermatology, (Baccetti, B. ed.), Rome: Accad. Nazian. Lincei 1970Google Scholar
  32. Gardiner, S.L.: Fine structure of the ciliated epidermis on the tentaclesOwenia fusiformis (Polychaeta, Oweniidae). Zoomorphologie91, 37–48 (1978)Google Scholar
  33. Gardiner, S.L.: Fine structure ofOwenia fusiformis (Polychaeta, Oweniidae) and its significance for annelid phylogeny. Ph.D. Thesis, University of North Carolina, 146 pp. 1979Google Scholar
  34. Goodrich, E.S.: The study of nephridia and genital ducts since 1895. Q. J. Microsc. Sci.86, 113–392 (1945)Google Scholar
  35. Gould, S.J.: Ontogeny and Phylogeny. 501 pp. Cambridge: Harvard University Press 1977Google Scholar
  36. Graebner, I.: Erste Befunde über die Feinstruktur der Exkretionszellen der Gnathostomulidae (Gnathostomula paradoxa, Ax 1956 undAustrognathia riedli, Starrer 1965). Mikroskopie23, 277–292 (1968)Google Scholar
  37. Grassé, P.-P.: Traité de Zoologie, Vol. 5, Paris: Masson et Cie. 1959Google Scholar
  38. Hay, E.D., Coward, S.J.: Fine Structure Studies on the planarian,Dugesia I. Nature of the ‘Neoblast’ and other cell types in noninjured worms. J. Ultrastruct. Res.50, 1–21 (1975)Google Scholar
  39. Hempelmann, F.: Erste und zweite Klasse der Vermes Polymera (Annelida): Archiannelida (UrRingelwürmer) und Polychaeta (Borstenwürmer). In: Handbuch der Zoologie, Vol. 2. (Kükenthal, W., Krumbach, T. eds.), Berlin: Walter de Gruyter and Co. 1934Google Scholar
  40. Hendelberg, J.: Comparative morphology of turbellarian spermatozoa studied by electron microscopy. Acta Zool. Fenn.154, 149–162 (1977)Google Scholar
  41. Hermans, C.O.: The systematic position of the Archiannelida. Syst. Zool.18, 85–102 (1969)Google Scholar
  42. Hess, R.T., Vena, J.A.: Fine structure of the clitellum of the annelidEnchytraeus fragmentosus. Tissue Cell6, 503–514 (1974)Google Scholar
  43. Holland, N.D., Nealson, K.H.: The fine structure of the echinoderm cuticle and the subcuticular bacteria of echinoderms. Acta Zool.59, 169–185 (1978)Google Scholar
  44. Hyman, L.H.: The Invertebrates. Vol. II. New York: McGraw-Hill 1951aGoogle Scholar
  45. Hyman, L.H.: The Invertebrates. Vol. III. New York: McGraw-Hill 1951bGoogle Scholar
  46. Hyman, L.H.: The Invertebrates. Vol. V. New York: McGraw-Hill 1959Google Scholar
  47. Ivanov, A.V.: Embryonalentwicklung der Pogonophora und ihre systematische Stellung. (The Phylogeny and Systematic position of the Pogonophora) Z. Zool. Syst. Evolutionsforsch. Suppl. 1, 10–44 (1975)Google Scholar
  48. Jägersten, G.: Evolution of the metazoan life cycle, pp. 282 New York: Academic Press 1972Google Scholar
  49. Jansson, B.-O.: The ‘Umwelt’ of the interstitial fauna. Smithson. Contrib. Zool.76, 129–140 (1971)Google Scholar
  50. Jouin, C.: Status of the knowledge of the systematics and ecology of Archiannelida. Smithson. Contrib. Zool.76, 47–56 (1971)Google Scholar
  51. Jouin, C.: Anatomical and ultrastructural study of the pharyngeal bulb ofProtodrilus (Polychaeta, Archiannelida) II. The stomodeal epithelium and its cuticle. Tissue Cell10, 289–301 (1978)Google Scholar
  52. Karling, T.G.: On the defecation apparatus in the genusArchimonocelis (Turbellaria, Monocelididae). Sarsia24, 37–44 (1966)Google Scholar
  53. Karling, T.G.: On the anatomy and affinities of the turbellarian orders. In: Biology of the Turbellaria, (N.W. Riser, M.P. Morse, eds.), Libbie H. Hyman Memorial. New York: McGraw-Hill 1974Google Scholar
  54. Knauss, E.B.: Indication of an anal pore in Gnathostomulida. Zool. Scripta8, 181–186 (1979)Google Scholar
  55. Lasserre, P.: Oligochaeta from the marine meiobenthos. Taxonomy and ecology. Smithson. Contrib. Zool,76, 71–86 (1971)Google Scholar
  56. Lasserre, P.: Clitellata. In: Reproduction of Marine Invertebrates, Vol. III. (A.C. Giese, J.S. Pearse eds.), pp. 215–275 New York: Academic Press, 1975Google Scholar
  57. Martin, G.G.: Ciliary gliding in lower invertebrates. Zoomorphologie91, 249–261 (1978)Google Scholar
  58. McIntyre, A.D.: Ecology of marine meiobenthos. Biol. Rev.44, 245–290 (1969)Google Scholar
  59. Michaelsen, W.: Dritte Klasse der Vermes Polymera (Annelida) Clitellata=Gürtelwürmer. In: Handbuch der Zoologie, Vol. 2, no. 8s, (W. Kükenthal, T. Krumbach eds.), Berlin: Walter de Gruyter and Co. 1934Google Scholar
  60. Mileikovsky, S.A.: On the systematic interrelationships within the Polychaeta and Annelida an attempt to create an integrated system based on their larval morphology. Essays on Polychaetous Annelids in Memory of Dr. Olga Hartman, Allan Hancock Fdn., pp. 503–524 (1977)Google Scholar
  61. Moraczewski, J.: Asexual reproduction and regeneration ofCatenula (Turbellaria, Archoophora). Zoomorphologie88, 65–80 (1977)Google Scholar
  62. Nørrevang, A.: On the mucous secretion from the proboscis inHaurimania kupferis (Enteropneusta). Ann. N.Y. Acad. Sci.118, 1052–1069 (1965)Google Scholar
  63. Oaks, J.A.: Ultrastructure ofLineus ruber (Rhynchocoela) epidermis. Tissue Cell10, 227–242 (1978)Google Scholar
  64. Petersen, K.J.: Studies on the nature of planarian connective tissue. Z. Zellforsch. Mikrosk. Anat.53, 569–608 (1961)Google Scholar
  65. Petersen, K.J.: Slime-secreting cells of planarians. Ann. N.Y. Acad. Sci.106, 424–442 (1963)Google Scholar
  66. Petersen, K.J.: The cellular organization ofConvoluta convolula, an acoel turbellarian. A cytological, histochemical, and fine-structural study. Z. Zellforsch. Mikrosk. Anat.64, 655–687 (1964)Google Scholar
  67. Petersen, K.J.: The Organization of the connective tissue ofDiscocelides langi (Turbellaria: Polycladida). Z. Zellforsch. Mikrosk. Anat.71, 94–117 (1966)Google Scholar
  68. Potswald, H.E.: A fine structural analysis of the epidermis and cuticle of the oligochaeteAeolosoma bengalense Stephenson. J. Morphol.135, 185–212 (1971)Google Scholar
  69. Pullen, E.W.: A histological study ofStenostomum virginianum. J. Morphol.101, 579–621 (1957)Google Scholar
  70. Reisinger, E.: Die GattungRhynchoscolex. Z. Morph. Oekol. Tiere1, 1–37 (1924)Google Scholar
  71. Reisinger, E.: Die Lösung desParergodrilus-Problems. Z. Morph. Oekol. Tiere48, 517–544 (1960)Google Scholar
  72. Reisinger, E.: Die Evolution des Orthogons der Spiralier und das Archicoelomatenproblem. Z. Zool. Syst. Evolutionsforsch.10, 1–43 (1972)Google Scholar
  73. Remane, A.: Rotatorien. In: Klassen und Ordnungen des Tier-Reiches, vol. 4, no. 2 (1–4), (H.G. Bronn, ed.), Leipzig: Akademische Verlagsgesellschaft 1929Google Scholar
  74. Remane, A.: Archiannelida. In: Die Tierwelt der Nord- und Ostsee, Vol. Vla. (G. Grimpe, E. Wagler, eds.) 1932Google Scholar
  75. Remane, A., Storch, V., Welsch, U.: Systematische Zoologie. Stuttgart: Gustav Fischer Verlag 1976Google Scholar
  76. Richards, K.S.: Epidermis and Cuticle. In: Physiology of Annelids (Mill, P.J. ed.), pp. 33–61 New York: Academic Press 1977aGoogle Scholar
  77. Richards, K.S.: Structure and function in the oligochaete epidermis (Annelida). Symp. Zool. Soc. London39, 171–193 (1977b)Google Scholar
  78. Rieger, R.M.: Fine structure of the body wall, the nervous system, and the digestive system of the Lobatocerebridae Rieger (Annelida) and remarks to the organization of the gliointerstitial systems in Annelida. J. Morphol. (1980, in press)Google Scholar
  79. Rieger, R.M.: Die Turbellarienfamilie Dolichomacrostomidae Rieger. II. Teil. Dolichomacrostominae. 1. Zoll. Jahrb. Abt. Syst. Oekol. Geogr. Tiere98, 569–703 (1971)Google Scholar
  80. Rieger, R.M., Mainitz, M.: Comparative fine structure study of the body wall in Gnathostomulida and their phylogenetic position between Platyhelminthes and Aschelminthes. Z. Zool. Syst. Evolutionsforsch.15, 9–35 (1977)Google Scholar
  81. Rieger, R.M., Rieger, G.E.: Fine structure of the pharyngeal bulb inTrilobodrilus and its phylogenetic significance within Archiannelida. Tissue Cell7, 267–279 (1975)Google Scholar
  82. Rieger, R.M., Rieger, G.E.: Fine structure of the archiannelid cuticle and remarks on the evolution of the cuticle within the Spiralia. Acta Zool.57, 53–68 (1976)Google Scholar
  83. Rieger, G.E., Rieger, R.M.: Comparative fine structure of the gastrotrich cuticle and aspects of cuticle evolution within the Aschelminthes. Z. Zool. Syst. Evolutionsforsch.15, 81–124 (1977)Google Scholar
  84. Rieger, R.M., Ruppert, E.: Resin embedments of quantitative meiofauna samples for ecological and structural studies — description and application. Mar. Biol.46, 223–235 (1978)Google Scholar
  85. Rieger, R.M., Ruppert, E., Rieger, O.E., Schoepfer-Sterrer, C.: On the fine structure of gastrotrichs with description ofChordodasys antennatus sp. n. Zool. Scripta3. 219–237 (1974)Google Scholar
  86. Rieger, R.M., Tyler, S.: A new glandular sensory organ in interstitial Macrostomida I. Ultrastructure. Mikrofauna Meeresbodens.42, 1–41 (1974)Google Scholar
  87. Rieger, R.M., Tyler, S.: The homology theorem in ultrastructural research. Am. Zool.19, 655–644 (1979)Google Scholar
  88. Ruhberg, H., Storch, V.: Über Wehrdrüsen und Wehrsekret vonPeripatopsis moseleyi (Onychophora). Zool. Anz.198, 9–19 (1977)Google Scholar
  89. Ruppert, E.: A review of metamorphosis of turbellarian larvae. In: Settlement and Metamorphosis of Marine Invertebrate Earvae, (Chia, Rice eds.), pp. 65–81, Elsevier: North-Holland Biomedical Press 1978Google Scholar
  90. Salvini-Plawen, L. v.: Zur systematischen Stellung von Soleolifera undRhodope (Gastropoda, Euthyneura). Zool. Jahrb. Syst. Abt. Oekol. Geogr. Tiere97, 285–299 (1970)Google Scholar
  91. Salvini-Plawen, L. v.: On the origin and evolution of the lower Metazoa. Z. Zool. Syst. Evolutionsforsch.16, 40–88 (1978)Google Scholar
  92. Schneider, K.C.: Lehrbuch der Vergleichenden Histologie der Tiere. Jena: Verlag Gustav Fischer 1902Google Scholar
  93. Schroeder, P.C., Hermans, C.O.: Annelida: Polychaeta. In: (A.C. Giese, J.S. Pearse eds.), Reproduction of Marine Invertebrates, Vol. III, New York: Academic Press 1975Google Scholar
  94. Slewing, R.: Probleme und neuere Erkenntnisse in der Großsystematik der Wirbellosen. Verh. Dtsch. Zool. Ges.69, 59–83 (1976)Google Scholar
  95. Steinböck, O.: Marine. Turbellaria. Zool. Faroes8, 1–26 (1931)Google Scholar
  96. Sterrer, W.: Beiträge zur Kenntnis der Gnathostomulida. I. Anatomie und Morphologie des GenusPterognathia Sterrer. Ark. Zool.22, 1–125 (1969)Google Scholar
  97. Sterrer, W., Rieger, R.: Retronectidae a new cosmopolitan marine family of Catenulida (Turbellaria). In: Biology of the Turbellaria. Eibbie H. Hyman Memorial Volume, Riser, N.W. and M.P. Morse (eds.), New York: McGraw-Hill pp. 63–92 1974Google Scholar
  98. Storch, V., Welsch, U.: The ultrastructure of epidermal mucous cells in marine invertebrates (Nemertini, Polychaeta, Prosobranchia, Opisthobranchia). Mar. Biol.13. 167–175 (1972)Google Scholar
  99. Swedmark, B.: Recherches sur la morphologie, le développment et la biologie dePsammodrilus balanoglossoides, Polychete sédentaire de la microfaune des sables. Arch. Zool. Exp. Gen.92, 141–220 (1955)Google Scholar
  100. Swedmark, B.:Psammodriloidesfauvelin. gen., n. sp. et la famille des Psammodrilidae (Polychaeta, Sedentaria). Ark. Zool.12, 55–64 (1959)Google Scholar
  101. Swedmark, B.: The interstitial fauna of marine sand. Biol. Rev.39, 1–42 (1964)Google Scholar
  102. Teuchert, G.: Die Feinstruktur des Protonephridialsystems vonTurbanella cornuta Remane, einem marinen Gastrotrich der Ordnung Macrodasyoidea. Z. Zellforsch. Mikrosk. Anat.136, 277–289 (1973)Google Scholar
  103. Teuchert, G.: Aufbau und Feinstruktur der Muskelsysteme vonTurbanella cornuta Remane (Gastrotricha, Macrodasyoidea). Mikrofauna Meeresboden39, 1–26 (1974)Google Scholar
  104. Teuchert, G.: The ultrastructure of the marine gastrotrichTurbanella cornuta Remane (Macrodasyoidea) and its functional and phylogenetical importance. Zoomorphologie88. 189–246 (1977)Google Scholar
  105. Teuchert, G.: Strukturanalyse von Bewegungsformen bei Gastrotrichen. Zool. Jahrb. Anat. Abt. Oekol. Geogr. Tiere99, 12–22 (1978)Google Scholar
  106. Tyler, S.: Comparative ultrastructure of adhesive systems in Turbellaria. Zoomorphologie84, 1–76 (1976)Google Scholar
  107. Tyler, S.: Ultrastructure and systematics: an example from turbellarian adhesive organs. Mikrofauna Meeresboden61, 271–286 (1977)Google Scholar
  108. Tyler, S., Rieger, R.M.: Ultrastructural evidence for the systematic position of the Nemertodermatida (Turbellaria). Acta Zool. Fenn.154, 194–207 (1977)Google Scholar
  109. van der Eand, J., Nørrevang, A.: The systematic position ofLamellibrachia (Annelida, Vestimentifera). Z. Zool. Syst. Evolutionsforsch., The Phylogeny and Systematic position of the Pogonophora, Suppl. 1, 86–101 (1975)Google Scholar
  110. van der Land, J., Nørrevang, A.: Structure and relationships ofLamellibrachia (Annelida, Vestimentifera). K. Dan. Vidensk. Selsk. Biol. Skr.21, 1–102 (1977)Google Scholar
  111. Welsch, U., Storch, V.: Comparative Animal Cytology and Histology, University of Washington Press, Seattle, 343 pp. 1976Google Scholar
  112. Westblad, E.: OnMeara stichopi (Bock) Westblad, a new representative of Turbellaria Archoophora. Arkiv. Zool.1, 43–57 (1949)Google Scholar
  113. Westheide, W.: Monographie der GattungenHesionides Friedrich undMicrophthalmus Mecznikow (Polychaeta, Hesionidae). Z. Morphol. Tiere61, 1–159 (1967)Google Scholar
  114. Westheide, W.: Interstitial Polychaeta (excluding Archiannelida). Smithson. Contrib. Zool.76, 57–70 (1971a)Google Scholar
  115. Westheide, W.:Apharyngtus punicus nov. gen. nov. spec, ein aberranter Archiannelide aus dem Mesopsammal der tunesischen Mittelmeerküste. Mikrofauna Meeresboden6, 1–19 (1971b)Google Scholar
  116. Westheide, W.: Ultrastructure of the genital organs in interstitial polychaetes. I. Structure, development and function of the copulatory stylets inMicrophthalmus cf.listensis. Zoomorphologie91, 101–118 (1978)Google Scholar
  117. Westheide, W., Rieger, R.M.: Cuticle ultrastructure of hesionid polychaetes (Annelida). Zoomorphologie91, 1–18 (1978)Google Scholar
  118. Wilson, R.A., Webster, L.A.: Protonephridia. Biol. Rev.49, 127–160 (1974)Google Scholar
  119. Wondrak, G.: Die Exoepithelialen Schleimdrüsenzellen vonArion empiricorum (Fér.). Z. Zellforsch. Mikrosk. Anat.76, 287–294 (1967)Google Scholar

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© Springer-Verlag 1980

Authors and Affiliations

  • R. M. Rieger
    • 1
  1. 1.Department of ZoologyUniversity of North CarolinaChapel HillUSA

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