Viviparity and Intrauterine Feeding in a New Holocephalan Fish from the Lower Carboniferous of Montana

Science  08 Aug 1980:
Vol. 209, Issue 4457, pp. 697-699
DOI: 10.1126/science.209.4457.697


A new species of Lower Carboniferous holocephalan chondrichthyan, Delphyodontos dacriformes, is described from two fetal specimens. The well-developed slashing and piercing dentition, enlargement of the abdominal region, and fecal material indicate the probable evolution of intrauterine oophagy and viviparity in Paleozoic Chondrichthyes.