Faunal Turnover and Evolution in Response to Climate Change in Mollusks of the Eocene La Meseta Formation, Seymour Island, Antarctic Peninsula

Measurements are reported in millimeters and were made with digital calipers accurate to 0.02 millimeters. Locality and stratigraphic occurrence of each individual are also reported. Naticid shell-drilling data consist of outer borehole diameter, prey height, and prey width measurements, as well as a determination of lethality or sublethality for each predatory attack.

Morphometric data are reported in millimeters and were made with digital calipers accurate to 0.02 millimeters. Locality and stratigraphic occurrence of each individual are also reported. Data were collected from the bivalve Eurhomalea (197 drilled individuals) and the gastropod Polinices (104 drilled individuals, representing cannibalistic attacks).

For Eurhomalea, the type of valve (left or right) bearing the borehole is indicated, and borehole placement is binned into shell quadrants (anteriodorsal, anterioventral, posteriodorsal, posterioventral). For Polinices, borehole placement is binned into five shell sectors: 1 (= last 90 degrees of last whorl), 2 (= penultimate 90 degrees of last whorl), 3 (between 180 and 270 degrees from outer lip on last whorl), 4 (= first 90 degrees of last whorl), and 5 (= spire).

Specimens were collected by field parties directed by R. B. Aronson and D. B. Blake. This data set was made possible by National Science Foundation grants OPP-9908828 (Aronson) and OPP-9908856 (Blake).