Los generos Martesia y Xylophaga han sido estudiados en todo el mundo, incluyendo aguas costeras y profundas, en sus aspectos reproductivos y fisiologicos (Ansell & Nair, 1967, Nair et al.
The Mechanisms of boring in Martesia striata Linne (Bivalvia: Pholadidae) and Xylophaga dorsalis Turton (Bivalvia: Xylophaginidae).
The role of wood in the diet of Xylophaga has not, however, been determined experimentally.
In this report we present evidence that bacterial endosymbionts are present in the gill tissue of two species of Xylophaga, and that these bacteria appear morphologically similar to the gill endosymbionts previously identified in shipworms.
Both Xylophaga atlantica and Xylophaga washingtona were used for TEM of the gills and light microscopy of the digestive tract.
The gross morphology of the gills of Xylophaga has been described in detail by Purchon (1941) and will be briefly summarized here.
No conspicuous internal structures, such as the sulfur granules seen in thiotrophic symbionts or the stacked internal membranes seen in methanotrophic symbionts of other bivalve families (Fisher, 1990), are observed in the symbionts of Xylophaga.