Morphology and Cyclic Activity of the Digestive Gland ofZidona dufresnei(Caenogastropoda: Volutidae)

Morphology of the digestive gland of the marine panpulmonate limpetSiphonaria lessonii: A cytological, histochemical, and ultrastructural description

“…However, such structures have not been observed in this study and the presence of calcium has not been histochemically revealed. Our observations suggest that the main function of basophilic cells is the synthesis of enzymes for extracellular digestion, as it has been reported for other gastropods (Arrighetti et al, ; Lobo‐da‐Cunha, ; Ojeda et al, ).…”

“…Likewise in other gastropods Ojeda et al, 2015), the cycle of activity of S. lessonii consists of three phases, absorption, digestion and, fragmentation phase, preceded by a resting phase. All these phases are reflected in alterations of cellular morphology and function.…”

“…In most gastropods, the epithelium of the digestive gland is composed of two well distinguishable cell types: the digestive cells, responsible for intracellular digestion, and the basophilic cells, responsible for extracellular digestion (Arrighetti et al, ; Dimitriadis & Andrews, ; Lobo‐da‐Cunha, , ). The cycle of digestive activity of mature tubules is commonly divided into three phases: absorption, digestion, and fragmentation (Arrighetti et al, ; Merdsoy & Farley, ; Nelson & Morton, ; Ojeda, Arrighetti, & Giménez, ). Despite these studies about the digestive system of mollusks, particularly gastropods, the available information for siphonarids is scarce (Murty et al, ).…”

Structural and Ultrastructural investigation on the digestive tubules of the freshwater mussel Caelatura parreyssi (Family: Unionidae) (Philippi, 1848) from the River Nile (Egypt).

“…Concerning the ultrastructure of digestive tubules of C. parreyssi, the current result showed that the digestive cells have microvilli on their free surfaces and pits at the bases of the microvilli. The ultrastructural details of cell organelles of the digestive cells were mostly similar to that of the digestive cells of other marine bivalves such as Cardium edula and Crassostrea virginica that examined by Owen (1970), John (1995) and Winstead (1998), as well as number of gastropods like, Acnatina fulica (Chaki and Misra, 2004), Adelomelon beckii (Arrighetti et al, 2015), Zidona dufresnei (Ojeda et al, 2015), Laevicau lisalta (Nathet al, 2015) and Theba pisana (De Vico et al, 2017). The presence of membrane invagination at the apical surface of the digestive cells suggests a process of pinocytosis of food particles as reported previously by Taieb (2001).…”

Ultrastructure of the scolex of Orygmatobothrium schmittii (Cestoda: Phyllobothriidea)

“…Seventeen scolices were dehydrated and embedded in paraffin and longitudinal, sagittal, and cross‐sections were cut at a thickness of 8 μm. Sections were stained with different histochemical techniques: Coomassie brilliant blue (Kiernan, ) to detect proteins/peptides, periodic acid Schiff counterstained with Carazzi's hematoxylin (Suvarna, Layton, & Bancroft, ) for neutral carbohydrates or mucopolysacharides, and Sudan black (Chandra, Rao, & Shyamasundari, ; Ojeda, Arrighetti, & Giménez, ) to detect lipids. Sections of intestines of Wistar rats HsdFcen:WI, were used as positive and negative controls for the histochemical techniques.…”