1. The liverwort Marchantia polymorpha, a model for all ages<br>John L. Bowman<br>2. The wild grass Brachypodium distachyon as a developmental model system <br>Michael T. Raissig and Daniel P. Woods<br>3. The history of Salpingoeca rosetta as a model for reconstructinganimal origins <br>David S. Booth and Nicole King<br>4. Emerging models: The “development of the ctenophore Mnemiopsis leidyi and the cnidarian Nematostella vectensis as useful experimental models <br>Mark Q. Martindale<br>5. Past, present and future of Clytia hemisphaerica as a laboratory jellyfish <br>Evelyn Houliston, Lucas Leclère, Catriona Munro, Richard R. Copley, and Tsuyoshi Momose<br>6. Studying development, regeneration, stem cells, and more in the acoel Hofstenia miamia <br>Mansi Srivastava<br>7. Tardigrades and their emergence as model organisms <br>Bob Goldstein<br>8. The crustacean model Parhyale hawaiensis<br>Mathilde Paris, Carsten Wolff, Nipam H. Patel, and Michalis Averof<br>9. My road to the ants: A model clade for eco-evo-devo<br>Ehab Abouheif<br>10. Cricket: The third domesticated insect <br>Taro Mito, Yoshiyasu Ishimaru, Takahito Watanabe, Taro Nakamura, Guillem Ylla, Sumihare Noji, and Cassandra G. Extavour<br>11. Schmidtea happens: Re-establishing the planarian as a model for studying the mechanisms of regeneration<br>Phillip A. Newmark and Alejandro Sánchez Alvarado<br>12. The good, the bad, and the ugly: From planarians to parasites<br>Tania Rozario, James J. Collins III, and Phillip A. Newmark<br>13. Slipper snail tales: How Crepidula fornicata and Crepidula atrasolea became model molluscs<br>Deirdre C. Lyons and Jonathan Q. Henry<br>14. Sifting through the mud: A tale of building the annelid Capitella teleta for EvoDevo studies <br>Elaine C. Seaver<br>15. Glossiphoniid leeches as a touchstone for studies of development in clitellate annelids<br>David A. Weisblat<br>16. Journey beyond the embryo: The beauty of Pristina and naidine annelids for studying regeneration and agametic reproduction<br>Alexandra E. Bely<br>17. Streblospio benedicti: A genetic model for understanding the evolution of development and life-history <br>Christina Zakas<br>18. The arm of the starfish: The far-reaching applications of Patiria miniata as a model system in evolutionary, developmental, and regenerative biology<br>Anne Meyer and Veronica Hinman<br>19. Saccoglossus kowalevskii: Evo-devo insights from the mud <br>Jessica Gray, Jens H. Fritzenwanker, Doreen D. Cunningham, and Christopher J. Lowe<br>20. The invertebrate chordate amphioxus gives clues to vertebrate origins <br>Linda Z. Holland and Nicholas D. Holland<br>21. Big insight from the little skate: Leucoraja erinacea as a developmental model system <br>J. Andrew Gillis, Scott Bennett, Katharine E. Criswell, Jenaid Rees, Victoria A. Sleight, Christine Hirschberger, Dan Calzarette, Sarah Kerr, and Jeremy Dasen<br>22. The Axolotl's journey to the modern molecular era <br>Karen Echeverri, Jifeng Fei, and Elly M. Tanaka<br>23. A remarkable rodent: Regeneration and reproduction in spiny mice (Acomys) <br>Ashley W. Seifert and Peter Temple-Smith