Zaphlegidae

Euzaphlegidae is a family of extinct escolar-like ray-finned fish closely related to the snake mackerels. Fossils of euzaphlegids are found from earliest Eocene to Late Miocene-aged marine strata of Europe, the Caucasus Mountains, India, Iran, Turkmenistan, Italy,Bannikov, Alexandre F. (2008) "A new genus and species of putative euzaphlegid fish from the Eocene of Bolca in northern Italy (Periformes, Trichiuroidea)." Studi e Ricerche sui giacimenti Terziari di Bolca, XII Miscellanea Paleontologica 9: 99-107

/ref> and Southern California.David, Lore Rose (January 10, 1943). ''Miocene Fishes of Southern California''. Geological Society of America. pp. 104-115.

Description and taxonomy

In life, the Euzaphlegidae would have borne a superficial resemblance to mackerels or wahoo, leading some researchers to place them within the Scombridae or Cybiidae, respectively. However, X-ray analysis of the bone structure strongly suggests a relationship with the snake-mackerels, with some experts placing them within the Gempylidae.

Ecology and anatomy

The sharp teeth and mackerel-like forms strongly suggest that the euzaphlegids were predators, verified by the remains of numerous extinct deep sea smelt, ''Bathylagus'', and herring, '' Xyne grex'', found within the stomachs of several specimens of '' Thyrsocles'' and '' Euzaphleges''. Researcher Lore Rose David proposed that, because the Euzaphlegidae were comparatively less adapted to a pelagic lifestyle like the gempylids, but had slender skeletons suggesting of a deep-water lifestyle, the Euzaphlegidae lived in deep, offshore communities near the ocean floor, where they preyed on other fish. David also suggested that the Euzaphlegidae presence in Miocene California excluded the gempylids from establishing themselves there at the time, while the presence of scombrids in shallower water ecosystems prevented the Euzaphlegidae from establishing themselves in shallow water.

Taxonomy

Originally, the family Euzaphlegidae (synonym=Zaphlegidae) originally described containing only the three to four genera from Late Miocene Southern California strata. Later, the genus '' Palimphyes'', whose 10 species are found in Paleogene Tethys and Paratethys strata from the Swiss Alps, the Carpathians, Caucasus, Iran, India and Turkmenistan, was placed within Euzaphlegidae as the subfamily Dipterichthyinae (named after a junior synonym, ''Dipterichthys''). Recently, a new genus, '' Veronaphleges'', was found and described from Monte Bolca, representing one of the very few mesopelagic fish known from that lagerstätte. ''Veronaphleges'' apparently is a basal form that can not be grouped in either subfamily.

Evolution

The family originated in the eastern Tethys during the late Paleocene or early Eocene, with the first known genus being '' Palimphyes palaeocenicus'' from the earliest Eocene (formerly considered Late Paleocene)-aged Danata Formation. The family becomes widespread throughout the Tethys and Paratethys Oceans, until the Late Oligocene, when the genus ''Palimphyes'' disappears from the fossil record. Euzaphlegids would survive in deep water habitats of what is now Southern California, where they became mesopelagic predators ecologically similar to their relatives, the snake mackerels and escolars.

During the time of the Late Miocene, Southern California had a very warm, tropical climate. The transition from Late Miocene to Early Pliocene

HOME


Content is Copyleft
Website design, code, and AI is Copyrighted (c) 2014-2017 by Stephen Payne


Consider donating to Wikimedia



As an Amazon Associate I earn from qualifying purchases