As other species of Nitidulidae, adults of both sexes of Carpophilus humeralis (F.) and C. hemipterus (L.) exhibit two particular receptors in each antenna, respectively in the 10th and 11th segments. Study by light-microscope, TEM and SEM gives data as follows: i) Presence and shape of both receptors do not exhibit sex dimorphism. ii) The receptor of the 11th segment is flask-like and opens through a very small pore (nearly 10 µm in diameter) on that segment face which is oriented downwards when the insect walks; it bears a number of transversal crests along its internai walls. iii) The receptor of the 10th segment is a largely opened pit of the intersegmental face; it is deeper, partly vesicle-like, in C. humeralis. iv) Both receptors include a few basiconic sensilla of the type MPG-conoid, sensu Zacharuk (1980). v) No inlet of glandular cells was found in them. Observations show a trend to both confining of the elementary sensilla and redundance of receptors, which are difficult to rel:lte to any function, due to the lack of behavioral knowledge.
Dettagli strutturali dei chemiorecettori antennali in Carpophilus hemipterus (L.) e C.humeralis (F.) (Coleoptera, Nitidulidae)
PORCELLI, Francesco
1989-01-01
Abstract
As other species of Nitidulidae, adults of both sexes of Carpophilus humeralis (F.) and C. hemipterus (L.) exhibit two particular receptors in each antenna, respectively in the 10th and 11th segments. Study by light-microscope, TEM and SEM gives data as follows: i) Presence and shape of both receptors do not exhibit sex dimorphism. ii) The receptor of the 11th segment is flask-like and opens through a very small pore (nearly 10 µm in diameter) on that segment face which is oriented downwards when the insect walks; it bears a number of transversal crests along its internai walls. iii) The receptor of the 10th segment is a largely opened pit of the intersegmental face; it is deeper, partly vesicle-like, in C. humeralis. iv) Both receptors include a few basiconic sensilla of the type MPG-conoid, sensu Zacharuk (1980). v) No inlet of glandular cells was found in them. Observations show a trend to both confining of the elementary sensilla and redundance of receptors, which are difficult to rel:lte to any function, due to the lack of behavioral knowledge.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
