Alimentary canal and reproductive tract of Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae, Scolytinae)

Abstract

Neotropical Entomology 37(2): 143-151 (2008) Morfología General del Tracto Digestivo y Sistema Reproductivo de Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae, Scolytinae)RESUMEN -El estudio morfológico del tracto digestivo y el sistema reproductor de machos y hembras de Hypothenemus hampei Ferrari se describe a continuación. El tracto digestivo presenta un arreglo típico descrito para otros insectos. Ahora las diferencias morfológicas se encontraron en el buche del estomodeo, en donde se observaron estructuras espinosas y en el mesenteron se observo un número reducido de ciegos gástricos. Se evidenció por primera vez el comportamiento de la alimentación de las hembras de H. hampei, que requiere aparentemente de la ingesta del endosperma del café para poder producir huevos viables durante la oviposición. La presencia de burbujas de aire al interior del ventrículo anterior se cree que puede ser debido al hambre, más que a la respuesta al medio ambiente durante el vuelo como lo indicaban anteriores observaciones. El sistema reproductor de la hembra presenta dos ovarios y un arreglo estructural común a especímenes de la familia Curculionidae. El sistema reproductor masculino mostró una diferencia signifi cativa con respecto a otros miembros de la familia Curculionidae e incluso a otra especie de la tribu Scolytinae presentando un aedeagus esclerotizado compuesto de varios orifi cios en la porción terminal, por donde el esperma se expulsa durante el apareamiento. PALABRAS-CLAVE: Broca del café, morfología interna, comportamiento de alimentación, reproducciónABSTRACT -The alimentary canal and the reproductive tract of males and females of Hypothenemus hampei Ferrari are described. The alimentary canal of H. hampei showed the crop with several spinelike structures and the midgut with few gastric caeca. We evidenced for the fi rst time that adult females need to feed on coffee in order to produce viable eggs before and during oviposition period. The presence of air bubbles inside the anterior midgut may be due to starvation rather than the response of the environment during fl ying as previously reported. Two ovaries and the same structures and arrangements common to individuals of the Curculionidae beetles composed the female reproductive system. The male reproductive tract showed a signifi cant difference with respect to other Curculionidae and even other Scolytinae species as it showed a sclerotized aedeagus with several pore-like structures in the terminal portion where sperm is released during mating.

Nucleases as a barrier to gene silencing in the cotton boll weevil, Anthonomus grandis

“…Different insects belonging to various coleopteran families, such as Hypothenemus hampei [ 95 ], Dermestes maculatus [ 96 ], H . hampei [ 97 ] and Sitophilus zeamais [ 98 ], the anterior midgut is acidic, with a pH ranging from 4.5 to 5.0 [ 99 ]. Therefore, the pH regulates the nature and activity of the digestive enzymes in the gut lumen [ 100 ].…”

Morphology and Structural Changes in Flight Muscles of <I>Hypothenemus hampei</I> (Coleoptera: Curculionidae) Females

“…According to the position of the borer in the fruit during the infestation process (Villalba-Gault et al 1995), the borers without eggs (FFB-e) were in positions B (in pericarp of the fruit) and C (in Þrst millimeters of endosperm of fruit), and the borers with eggs (FFBϩe) were in position D (in endosperm of fruit). Only eggs found in the endosperm continue their development to larvae, pupae, and adults (Rubio et al 2008). Beetles from the fruit with more than one founding borer were not included in this study.…”

On a matter of seminal importance

“…The testes are shown in black, the bladder in dark gray, and the vas deferens and penis in lighter shades of gray. B: Diagrammatic view of the male reproductive tract of four insect species (modified from images in ). Unlike the situation in mammals, the accessory glands of the distantly‐related insects are not homologous to the same extent as are the glands in mammals, so they are all indicated in dark blue (black, testes; gray, ducts and intromittent organ).…”