The 2005 ESA Annual Meeting and Exhibition
December 15-18, 2005
Ft. Lauderdale, FL

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Saturday, December 17, 2005

Occurrence of antennal glands in ants

Robert Renthal, rrenthal@utsa.edu1, Daniel Velasquez, Daniel.Velasquez@utsa.edu1, David Olmos, dolmos@utsa.edu1, and S. Bradleigh Vinson, bvinson@neo.tamu.edu2. (1) Univ. of Texas at San Antonio, Biology, 6900 N. Loop 1604 W, San Antonio, TX, (2) Texas A&M Univ, Dept. of Entomology, College Station, TX

We recently found exocrine glands in the antennae of queens and workers of Solenopsis invicta and S. geminata (Isidoro et al., Insectes Sociaux 47: 236, 2000). Antennal glands had not been previously noted in a survey of antennae from about 50 ant species (not including Solenopsis) (Hashimoto, Appl. Entomol. Zool. 25: 491, 1990). Therefore we wanted to know if antennal glands are unique to Solenopsis, or if they are found in a wider taxonomic group. Using SEM, we examined the antennae of 38 ant species. Presence of antennal glands was indicated by a characteristic circumferential ring of pores in an antennal segment of workers. Pores were found in the 9th antennal segment of all species of Solenopsis examined (S. aurea, S. clytemnestsra, S. corticalis, S. desecheoensis, S. electra, S. fugax, S. gayi, S. geminata, S. globularia litoralis, S. interrupta, S. krockowi, S. latastei, S. macdonaghi, S. molesta, S. molesta validiuscula, S. pergandei, S. picea, S. picta, S. punctaticeps, S. quinquecuspis, S. richteri, S. tennesseensis, S. texana, S. wasmannii emery, and S. xyloni). Pores were absent in the following: Monomorium minimum, M.  pharonis, Pheidole spp., Crematogaster spp.,  Linepithema humile, Forelius spp., Dorymyrmex  spp., Paratrechina spp., Campanotus spp., Ectatomma ruidum, E. tuberlatum, and Pseudomyrmex ferruginea. However, pores were found in the 12th antennal segment of Tetramorium bicarinatum workers. This was the only non-Solenopsis species examined which showed evidence for antennal glands.

Species 1: Hymenoptera Formicidae Solenopsis invicta
Species 2: Hymenoptera Formicidae Tetramorium bicarinatum
Keywords: scanning electron microscopy, exocrine glands

Poster (.pdf format, 5290.0 kb)