Estudo ultra-estrutural do estômago de Trichogenes longipinnis (Britski & Ortega) (Pisces, Siluriformes, Trichomicteridae)

Abstract

ABSTRACT. ULTRASTRUCTURAL STUDY OF TH E STOMACH OF TRICHOGENES LONGIPINNIS (BRITSKI & ORTEGA) (PISCES , SILURIFORMES, TRICHOMICTERlDAE). The obselVations made abo ut the stomach ofTrichogenes longipinnis (Britski & Ortega, 1983) showed a rounded organ which has in its dorsal side an accessory structure -a cul de sac -that comunicates with it. The distal part ofthis dorsal accessorypresents characteristic of an organ that exerci se respiratory functions: reduction in the thickness of the mucosa and arrangement of an intrincate continuous capilar net in dose contact with lhe superficial cells of the epilhelium. ln this portion Ihere are no glands in the lamina propria. The epithelium shows a superficial squamous cels; they are very slim, and sometimes, with the capillary endothelium form a single barrier between the organ lumen and lhe blood. Polyhedric cells are also present in this epithelium; they are located under the squamous cells, sheltered betwcen capillaries and basal cells.

Histological and ultrastructural study of the stomach of the air-breathing Ancistrus multispinnis (Siluriformes, Teleostei)

“…Such a relationship was described in the catfish Hoplosternum thoracatum (Gee and Graham 1978). Examples of fish in which the digestive tract is adapted as an additional respiratory organ include Misgurnus fossilis (Jasiñski 1973), Corydoras paleatus (Kramer and McClure 1980), H. thoracatum (Gee and Graham 1978;Huebner and Chee 1978), and Trichogenes longipinnis (Pinheiro et al 1993).…”