Morphology caudal region (a–c). Posterior part of B. californiense showing differences in caudal fin and preanal fin chambers: (1) preanal fin chambers, (2) anus, (3) lobe dorsal fin variability.

 
 
  Part of: Campos-Dávila L, Pérez-Estrada CJ, Rodríguez-Estrella R, Morales-Bojórquez E, Brun-Murillo FG, Balart EF (2019) Seagrass Halodule wrightii as a new habitat for the amphioxus Branchiostoma californiense (Cephalochordata, Branchiostomidae) in the southern Gulf of California, Mexico. ZooKeys 873: 113-131. https://doi.org/10.3897/zookeys.873.33901