Two strains (Bergerac and Bristol) of the nematode Caenorhabditis elegans, with different temperature tolerances, were reared axenically at 23 degrees to 25 degrees C. The Bergerac strain is heat sensitive (that is, it is sterile at maturity), whereas the Bristol strain is heat resistant (that is, it matures and reproduces normally). Hybrid hermaphrodites (F(1)), produced by crossing Bristol males and Bergerac hermaphrodites, are heat tolerant. Heat sensitivity segregates as a simple Mendelian recessive in the F(2) and F(3) generations.
Nine genera, listed on pages 122–128 are recognized in the subfamily Rhabditinae Micoletzky, 1922, in place of three genera recognized by Osche (1952) in his recent revision of the genus Rhabditis Dujardin [1844] (sensu lato). Two of the genera—Pelodera Schneider, 1866 and Rhabditis (sensti stricto)—are subdivided into four and five subgenera respectively. One genus—Brevibucca Goodey, 1985—is accepted only provisionally in the Rhabditinae. The genus Neorhabditis Schuurmans Stekhoven, 1954 (syn. Pararhabditis Schuurmans Stekhoven, 1951; non Baylis and Daubney, 1926) is regarded as not belonging in the Rhabditinae
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.