Levels of expression for C.elegans, C.briggsae, C.japonica, and C.remanei genes from 4 cell stage to L1. See "Developmental  milestones punctuate gene expression in the Caenorhabditis embryo" (Levin et al, Dev Cell 2012). The study provides a picture of expression changes of all genes along the entirety of nematode embryogenesis in five nematode species from the maternal transcriptome to the first larvae and provides a global picture of gene expression levels throughout development.

For a detailed description of the developmental stages (column E to N) see Supplemental experimental procedures http://www.sciencedirect.com/science/article/pii/S1534580712001426. 

Levin M, Hashimshony T, Wagner F, Yanai I. Developmental milestones punctuate gene expression in the Caenorhabditis embryo. Dev Cell. 2012 May 15;22(5):1101-8. Epub 2012 May 3. PubMed PMID: 22560298.