Functional anatomy of the midgut gland of Gammarus locusta (Crustacea: Amphipoda)

Abstract

A description of the midgut gland of Gammarus locusta with the aim of using this organ as a complementary tool in ecotoxicological studies was made. The hepatopancreas is composed of two pairs of blind-ending tubular structures. The thickness and length of these tubules were ∼50 μm and 5 mm, respectively, in adult males (10–12 mm length). The distal part of each tubule is characterized by non-vacuolated E-cells typically exhibiting a relatively high nuclear to cytoplasmatic ratio. The epithelium of the remaining tubules is characterized by abundant columnar R- and F-cells, both ∼40 μm long. Large vacuolated B-cells (∼60 μm length) were very common along the midgut gland but seemed to increase in number in the proximal region of each tubule. An SEM examination revealed a delicate network of muscle fibres that limits the organ.

An integrated study on Gammarus elvirae (Crustacea, Amphipoda): perspectives for toxicology of arsenic-contaminated freshwater

“…As regards the two pairs of hepatopancreatic structures of G. elvirae, the pseudostratified epithelium in each tubule was found to consist of different cell types, as previously reported for other amphipods (Correia et al 2002;Davolos et al 2010). The distal part of the hepatopancreas was characterized by cuboidal and undifferentiated cells, known as E cells, that were densely arranged around a narrow duct, with a prominent round nucleus containing nucleoli (data not shown).…”

THE EFFECT OF FEEDING Lactobacillus ON GROWTH, SURVIVAL RATE AND PROTEASE ACTIVITY OF Litopenaeus vannamei

“…It is responsible for the synthesis and secretion of digestive enzymes. It also functions during uptake nutrients, storaging of inorganic reserves and lipid and carbohydrate metabolism (Correia et al, 2002). The function of hepatopancreas is assisted by R-cell and F-cell.…”

Primer registro e histología básica del anfípodo terrestre Talitroides topitotum (Amphipoda: Talitridae), introducido en las zonas montañosas de Heredia, Costa Rica

“…La estructura del hepatopáncreas es similar a otros malacostráceos, caracterizada por la diferenciación progresiva de células desde la región distal hacia la región proximal. Los tipos celulares observados son los descritos previamente en Litopenaeus, Gammarus locusta (Linnaeus, 1758; Gammaridae) y Macarorchestia remyi (Schellenberg, 1950;Talitridae): células indiferenciadas (células E), células de almacenamiento (R), células fibrosas (F) y células secretoras (B) (Bell & Lightner, 1988;Correia et al, 2002;Davolos et al, 2010). Sin embargo, el diámetro medio de los túbulos es mayor (140µm) al reportado para adultos de G. locusta (50µm), de tamaño similar (10-12mm; Correia et al, 2002).…”

“…La histología general de la especie, a nuestro conocimiento, no ha sido reportada, aunque otros estudios han evaluado aspectos histológicos de partes bucales, sistema digestivo y hepatopáncreas de anfípodos, incluyendo la familia Talitridae (Correia, Pereira, Costa & Carrapico, 2002;Davolos, Pavesi, Accordi & De Matthaeis, 2010). Los estudios histológicos proporcionan información importante sobre las adaptaciones específicas de las especies a nuevos ambientes (Davolos et al, 2010) y permite analizar cambios morfológicos producto de exposición a tóxicos ambientales (Correia et al, 2002).…”

“…Los estudios histológicos proporcionan información importante sobre las adaptaciones específicas de las especies a nuevos ambientes (Davolos et al, 2010) y permite analizar cambios morfológicos producto de exposición a tóxicos ambientales (Correia et al, 2002). En particular, la familia Talitridae ofrece una perspectiva única para el estudio de cambios evolutivos asociados con la colonización terrestre (Johnston, Johnston & Richardson, 2004).…”