Before the pre-inverted tubule inverts, a clear transition at its junction with the capsule has been observed in both operculate (Skaer, 1973: Holstein.
Although the precise details of how the tubule is anchored to the capsule wall may differ between operculate and non-operculate nematocysts, we infer that what Holstein (1981) termed the interna is the electron-dense, thick layer we saw along the inside of the capsule only at the apical end, where it lies against the layers that can be traced completely around the capsule wall (e.g., Figs.
208) inferred holds the "capsule at the cell surface until discharge." Rather, we interpret them as functionally analogous to the fibrous collar described by West-fall (1970) in the neck region of operculate nematocysts in the hydromedusan Gonionemus vertens.
Pollen grain morphology Triporate, Oblate spheroidal, pore more or less circular, operculate
, fossulate- foveolate, and exine 2.5 [micro]m thick (Figure 3).
In his concept of the Pezizales Korf  placed those operculate
discomycetes that are fimicolous with ascocarps reduced in size and complexity, possessing non-amyloid, with smooth, hyaline ascospores in the Pyronemataceae tribe Theleboleae while Eckblad  would treat this taxon at the family level.
The reports were based on characteristic large operculate
eggs having been found in routine stool examinations conducted during schistosomiasis surveys.
(lower portion rarely tardily loculical) with a short calyptrate indehiscent operculum with osseous endocarp becoming free from membranous longer portion; annual herb; stems strigose throughout from only simple trichomes to 1.5 mm long that are hyaline, rigid, appressed, straight above base; stipules demidiate-ovate or demidiate-cordiform, broad (most 2-4 mm) W.
Variable-sized operculate snails of tropical regions of Asia and Africa.
Small to medium-sized operculate snails of tropical regions of Africa.
Medium-sized operculate snails of in tropical and subtropical regions of the Old World, with only few species reaching temperate areas in Europe and South Africa.
sinensis is transmitted by a wide range of operculate
snails, Parafossarulus manchouricus being the main one (2).