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Comparative Parasitology 68(2) 2001 - Peru State College

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254 COMPARATIVE PARASITOLOGY, <strong>68</strong>(2), JULY <strong>2001</strong><br />

Figures 15-17. Tegument of posterior dorsal region<br />

of Lobatostoma jungwirthi. 15. Excretory pore<br />

on the dorsal cone. 16. Type of monociliate papilla<br />

in the posterior cone region. 17. Multiciliate sensory<br />

receptor in the posterior dorsal region. Scales: 15,<br />

17 = 5 (Jim; 16 = 10 fjim.<br />

the 4 types of receptors described by Rohde and<br />

Watson (1992) in the larva of L. manteri. In addition,<br />

a third kind of receptor was observed that<br />

corresponds to the marginal body complex in the<br />

adult. However, the complex formed by the marginal<br />

bodies was observed as described for the<br />

adult, though the pores of these glands are not<br />

yet developed in the posterior region of the ventral<br />

adhesive disc in the preadult.<br />

The most common receptors in the preadult<br />

Copyright © 2011, The Helminthological Society of Washington<br />

and in the adult were the intermediate length<br />

monociliate and the nonciliate dome-shaped papillae.<br />

The monociliate structures may correspond<br />

to some of the types I to V of monociliate<br />

dome-shaped papillae described for adult L.<br />

manteri (Rohde and Watson, 1989a). The nonciliate<br />

dome-shaped papillae may be homologous<br />

to those of type VI A and B found in the<br />

adult of L. manteri. Both types of receptors were<br />

abundant over the entire body, arranged in circles<br />

on the ventral adhesive disc. Longer monociliate<br />

papillae and multiciliate receptors were<br />

found exclusively in the adult. Probably more<br />

than one type of nonciliate and monociliate papillae<br />

may exist. It would be interesting to study<br />

these papillae further under transmission electron<br />

microscopy.<br />

Literature Cited<br />

Fredericksen, D. 1978. The fine structure and phylogenetic<br />

position of the cotylocidium larva of Cotylogaster<br />

occidentalis Nickerson, 1902 (Trematoda,<br />

Aspidogastrea). Journal of <strong>Parasitology</strong> 64:<br />

961-966.<br />

. 1980. Development of Cotylogaster occidentalis<br />

Nickerson, 1902 (Trematoda, Aspidogastridae)<br />

with observations on the growth of the ventral<br />

adhesive disc in Aspidogaster conchicola<br />

Baer, 1827. Journal of <strong>Parasitology</strong> 66:973-984.<br />

Halton, D. W., and R. A. W. Lyness. 1971. Ultrastructure<br />

of the tegument and associated structures<br />

of Aspidogaster conchicola (Trematoda: Aspidogastrea).<br />

Journal of <strong>Parasitology</strong> 57:1198-1210.<br />

Ip, H., and S. Desser. 1984. Transmission electron<br />

microscopy of the tegumentary sense organs of<br />

Cotylogaster occidentalis (Trematoda: Aspidogastrea).<br />

Journal of <strong>Parasitology</strong> 70:563-575.<br />

, , and I. Weller. 1982. Cotylogaster<br />

occidentalis (Trematoda, Aspidogastrea): scanning<br />

electron microscopic observations of sense organs<br />

and associated surface structures. Transactions of<br />

the American Microscopical Society 101:253-<br />

261.<br />

Kritscher, V. E. 1974. Lobatostoma jungwirthi nov.<br />

spec. (Aspidocotylea, Aspidogastridae) aus Geophagus<br />

brachiurus Cope 1894 (Pise., Cichlidae).<br />

Annalen des Naturhistorischen Museums in Wien<br />

78:381-384.<br />

Lunaschi, L. 1984. Helmintos parasites de peces de<br />

agua dulce de Argentina. II. Presencia de Lobatostoma<br />

jungwirthi Kritscher, 1974 (Trematoda:<br />

Aspidogastrea) en Cichlasoma facetum (Jenyns).<br />

Neotropica 20:187-193.<br />

Rohde, K. 1972. Sinnesrezeptoren von Lobatostoma<br />

n. sp. (Trematoda, Aspidogastrea). Die Naturwissenschaften<br />

59:1<strong>68</strong>-169.<br />

. 1994. The Aspidogastrea, especially Multicotyle<br />

purvisi Dawes, 1941. Advances in <strong>Parasitology</strong><br />

10:78-151.<br />

, and N. Watson. 1989a. Sense receptors in

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