| 词条 | Delphyodontos |
| 释义 |
| fossil range = Bashkirian | name = Delphyodontos dacriformes | image = Delphyodontos_dacriformes.jpg | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Holocephali | genus = Delphyodontos | species = D. dacriformes | binomial = Delphyodontos dacriformes | binomial_authority = (Lund, 1980) }} Delphyodontos dacriformes is a prehistoric holocephalid fish from the middle Carboniferous-aged Bear Gulch Limestone Lagerstätte, during the Bashkirian Stage in Montana. The adult form is unknown, as the only fossil specimens are of aborted fetuses or recently born young.[1] Sharp teeth and fecal matter in the fossils suggests that Delphyodontos practiced intrauterine cannibalism,[1] like some modern sharks, such as sand tiger sharks. AppearanceAccording to the fossils, the recently born would have resembled tadpoles with small, but sharp beaks. Because of the evidence suggesting intrauterine cannibalism, D. dacriformes is assumed to have been carnivorous, though, besides siblings, it is unknown what other organisms they would have eaten. EtymologyThe generic name, Delphyodontos, means "womb tooth", in reference to the sharp, beak-like teeth and their possible habits of intrauterine cannibalism. The specific name, dacriformes, refers to the teardrop-shaped body. External links
References1. ^1 Lund, R. 1980. Viviparity and intrauterine feeding in a new holocephalan fish from the Lower Carboniferous of Montana. Science, 209: 697‑699. {{Taxonbar|from=Q3705156}}{{paleo-cartilaginous-fish-stub}} 6 : Holocephali|Prehistoric cartilaginous fish genera|Carboniferous cartilaginous fish|Pennsylvanian fish of North America|Fossil taxa described in 1980|Natural history of Montana |
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