title: Armed reproductives: evolution of the frontal gland in imagoes of Termitidae.
abstract: The frontal gland of termites is a structure without any equivalent among other animals. Although this gland is well known in soldiers, it received almost no attention in other castes. Recently, we described it in imagoes of Rhinotermitidae and Serritermitidae. In order to provide a complete picture of the evolution of this gland in termite imagoes, we studied it in additional 34 species of Termitidae, representing 7 of the 8 subfamilies. The frontal gland of these species is formed by class 1 secretory cells only, and occurs in two basic shapes: epithelial with reservoir in Foraminitermitinae and Macrotermitinae, and epithelial without reservoir in all other subfamilies. The size variability of the gland is high, not only among Termitidae subfamilies, but also within subfamilies. Our data suggest that the ancestral form of the frontal gland is epithelial with reservoir, as found in Rhinotermitidae, Serritermitidae, and basal Termitidae. The reduction of the reservoir occurred at least two times and the gland was lost two times independently: in Protermes sp. and in Microtermes toumodiensis (both Macrotermitinae).
authors.affiliation: Research Team of Infochemicals, Institute of Organic Chemistry and Biochemistry, Flemingovo nám. 2, 166 10 Prague, Czech Republic.
authors.forename: Kateřina
authors.initials: K
authors.lastname: Kutalová
authors.forename: Thomas
authors.initials: T
authors.lastname: Bourguignon
authors.forename: David
authors.initials: D
authors.lastname: Sillam-Dussès
authors.forename: Robert
authors.initials: R
authors.lastname: Hanus
authors.forename: Yves
authors.initials: Y
authors.lastname: Roisin
authors.forename: Jan
authors.initials: J
authors.lastname: Sobotník
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005088:Exocrine Glands / Q000648:ultrastructure; D005260:Female; D020049:Isoptera / Q000235:genetics* / Q000648:ultrastructure*; D008297:Male; D046529:Microscopy, Electron, Transmission; D010802:Phylogeny; D011157:Population Dynamics