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Comparative Parasitology 68(2) 2001 - Peru State College

Comparative Parasitology 68(2) 2001 - Peru State College

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PAOLA AND DAMBORENEA—TEGUMENT OF LOBATOSTOMA JUNGWIRTHI 253<br />

Figures 11-14. Ventral adhesive disc of adult Lobatostoma jungwirthi. 11. General view of the marginal<br />

alveoli on the marginal region at midbody level of the ventral adhesive disc. 12. Walls of the marginal<br />

alveoli showing 2 circles of dome-shaped papillae (arrow) and marginal gland pore. 13. Detail of the<br />

internal wall with almost 1 complete circle of monociliate papillae (arrows). 14. Ventral view: transverse<br />

septum with monociliate (black arrow) and nonciliate papillae (white arrow). Scales: 11 = 50 u,m; 12 =<br />

25 u,m; 13, 14 = 10 jrni.<br />

observed in the posterior third of the dorsal region<br />

of the adult of L. jungwirthi. Paired multiciliate<br />

receptor complexes with 10 short cilia<br />

were described by Rohde and Watson (1990d)<br />

to be located dorsally to the mouth cavity of<br />

larval M. purvisi, but our record is the first of a<br />

surface multiciliate receptor in aspidogastreans.<br />

However, multiciliate receptors are found in other<br />

groups of parasitic Platyhelminthes, i.e., in the<br />

taste organ of the buccal complex of Pricea tnultae<br />

Chauhan, 1945 (Monogenea, Gastrocotylidae).<br />

Rohde and Watson (1996) found these receptors<br />

concentrated in small pits. Additionally,<br />

multiciliate pit-receptors were observed in the<br />

buccal complex of Polylabroides australis (Rohde<br />

and Watson, 1995b) and in specimens of an<br />

undescribed species of Proseriata (Monocelididae:<br />

Minonidae) (Rohde and Watson, 1995a).<br />

Pores of the marginal bodies were observed<br />

on the external border between the marginal alveoli<br />

of juveniles and adults of L. jungwirthi.<br />

Kritscher (1974) found similar structures in the<br />

adult of the species. These pores were described<br />

as part of a glandular system in the adhesive disc<br />

of aspidogastrids (Rohde, 1994).<br />

Unlike the preadult, the youngest juvenile<br />

does not have oral lobules. A few less-developed<br />

alveoli were observed on the ventral adhesive<br />

disc. Two sensory receptors were found in the<br />

preadult of L. jungwirthi'. a ciliate receptor with<br />

a cilium of intermediate length, and a nonciliate<br />

dome-shaped receptor. These correspond to 2 of<br />

Copyright © 2011, The Helminthological Society of Washington

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