This dataset contains data from: Bellamy, L., Chapman, N., Fowler, K. and Pomiankowski, A. 2013. Sexual traits are sensitive to genetic stress and predict extinction risk in the stalk-eyed fly, Diasemopsis meigenii. The data were collected by: Lawrence Bellamy, e-mail: l.bellamy@ucl.ac.uk Andrew Pomiankowski, e-mail: ucbhpom@ucl.ac.uk Kevin Fowler, e-mail: k.fowler@ucl.ac.uk The data is saved in three CSV files. Bellamy et al. File 1.csv This file was used for the analyses of a) the effect of inbreeding on morphological traits and female fecundity and b) the association of trait values with extinction. The columns are labelled: Identity: denoting fly identity, used for reference. Sex: denoting the sex of an individual fly, where M = male and F = female. Generation: denotes generation that an individual fly belongs to. Inbreeding coefficient (F): denotes the inbreeding coefficient for each fly. Line: denotes the inbred line to which each fly belongs. F of extinction: denotes the inbreeding coefficient (F) at which the line went extinct. For lines that did not go extinct, F of extinction = 1. Thorax: denotes thorax length, defined as the distance (mm) between the middle of the most anterior part of the head to the posterior edge of the thorax. Eyespan: denotes eyespan, defined as the distance (mm) between the outermost tips of the eyes. Wing: denotes wing length, defined as the distance (mm) from the anterior cross-vein to the wing margin of the right wing. Fecundity per day: denotes the average number of eggs laid by a female per day, measured over a 3 week period. Bellamy et al. File 2.csv This file was used for the analysis of the effect of crossing of inbred lines. The columns are labelled: Cross: denotes cross ID, which corresponds to 17 inbred crosses and 17 outbred crosses. Family: denotes family ID. For each cross, two separate families were set up. For each outbred cross (line i x line j), two reciprocal families were set up (one with male i x female j, the other with male j x female i). To balance this, each inbred cross (line i x line i) was also replicated. Inbreeding treatment: denotes whether an individual was an inbred or outbred fly, where I = inbred and O = outbred. Maternal line adjusted: denotes the identity of the maternal line used in the cross. Females used in the cross originated from this line. Paternal line adjusted: denotes the identity of the paternal line used in the cross. Males used in the cross originated from this line. Sex: denotes the sex of an individual fly, where M = male and F = female. Thorax: denotes thorax length, defined as above. Eyespan: denotes eyespan, defined as above. Wing: denotes wing length, defined as above. Bellamy et al. File 3.csv This file was used for the analysis of the effect of environmental stress on morphological traits. The columns are labelled: Fly ID: denoting fly identity, used for reference. Sex: denotes the sex of an individual fly, where M = male and F = female. Eyespan: denotes eyespan, defined as above. Thorax: denotes thorax length, defined as above. Wing: denotes wing length, defined as above. Mass of corn: denotes the amount of food (g) that each individual was reared on.