Argentophilic "Papillae" of Schistosoma mansoni Cercariae

Effects of cadmium and zinc toxicity on orientation behaviour of Echinoparyphium recurvatum (Digenea: Echinostomatidae) cercariae

“…The nature of metal toxicity demonstrated here may be either a reflex response to the toxic environment or a by-product of the toxic action of metals on the cercariae.In both cases, it is possible that changes in normal orientation behaviour may be associated with the selective binding of metals to areas on the tegument surface which broadly correlate with a number of sensory receptor sites, especially in the cephalic region mapped out by Grabda-Kazubska & Kiseliene (1989) using silver nitrate stain. Nevertheless, the distribution pattern of metal-binding in the present study may also reflect binding to other surface structures, in particular glandular openings in the cephalic region, excretory pores and the mouth opening, all of which can be stained with silver nitrate (Short & Cartrett 1973). How- ever, it appears that not all sensory receptors described by Grabda-Kazubska & Kiseliene (1989) selectively bind the metals.…”

Cercarial Chaetotaxy and Sex Differentiation of Schistosoma mansoni Deriving from Humans and Nectomys squamipes (Muridae: Sigmondontinae) in Brazil

“…We observed a marked absence of the 7th ventral papilla (medial segment) in the Sumidouro isolates. This fact was not recorded for any cercariae papillae of a Puerto Rican strain (Short & Cartrett 1973).…”

“…Spatial disposition of papillae -We used a combination of the methodologies as proposed by Richard (1971) and Short and Cartrett (1973) with slight modifications. The cercarial body was divided in four parts: cephalic, preacetabular, medial e post-acetabular.…”

Phenotypic plasticity in the cercarial indices of human and rodent samples ofSchistosoma mansoni(Digenea: Schistosomatidae)

“…The fine structure of the AD and AL sensory receptors of S. mansoni has been described (Nuttman, 1971;Short and Cartrett, 1973;Dorsey et al, 2002). The AID, AIID, AIIID and AIL receptors, which are characterised by a low tegumentary collar on a dome-like base with a long cilium [ Fig.…”

“…The AID, AIID, AIIID and AIL receptors, which are characterised by a low tegumentary collar on a dome-like base with a long cilium [ Fig. 4(a); Short and Cartrett, 1973;Bogéa, 2004], have been presumed to function as mechanoreceptors, and have been found mainly on the dorsal side of cercariae of other Digenean genera (Bogéa and Caira, 2001a, b, c). In contrast, the AIIL, FIG.…”