Changes in version 1.0.0 (2026-08-30) o Initial release. A software implementation of the model described by Stevenson, Smit, and Setyawan (2026). o Includes model fitting function `fit.morph()`; plotting function `plotmorph()`; simulation functions `sim.measurements()`, `sim.morph()`, and `extract.sim.morph()`; prediction function `predictblup()`; and S3 methods `plot.lme.morph()`, `predict.lme.morph()`, `summary.lme.morph()`. o The data analysed in Stevenson, Smit, and Setyawan (2026) are available as the exported object `manta`.