1977/04/01 by John G. Maisey · 2 citations
Earth and Planetary Sciences · Environmental Science · #Paleontology and Evolutionary Biology #Ichthyology and Marine Biology #Fish biology, ecology, and behavior
paper · doi:10.1111/j.1096-3642.1977.tb01029.x
openalex publication_date 1977/04/01 · openalex created_date 2025/10/10 · openalex updated_date 2025/11/06
Palaeospinax (Lower Jurassic) is the oldest euselachian known from articulated remains, and has certain structural similarities with ctenacanths. Euselachians may therefore have evolved from ctenacanth fishes and not from hybodonts. Nemacanthus Agassiz 1837 (Triassic), known only from finspines, is closely allied to Palaeospinax and may represent an immediate ancestor.