Table 1.

Main morphological and histochemical characteristics of the three types of poison glands (COM, PAR and PER)

	COM	PAR	PER
Topological distribution	Typical of dorsal warts. Present in other body regions in all species	Typical of macroglands. Exclusively in Rs e Rj, in dorsal warts and other body regions	Exclusive at the periphery of macroglands
Morphological characterization	Spherical granules with heterogeneous subunits. Syncytium with low density and many conspicuous nuclei	Elliptic and homogeneous granules, without internal subunits. Syncytium with high density and low number of nuclei	Elliptic or spherical granules, with internal subunits. Dense syncytium with conspicuous nuclei
Histochemical characterization of granules	Positive to proteins, lipids and biogenic amines	Positive to acid glycoconjugates, lipids and biogenic amines	Positive to proteins, lipids and biogenic amines