Trisecphora

Trisecphora is a genus of extinct predatory ocenebrinid murexes indigenous to the Miocene coastline of what is now Maryland, North Carolina, and Virginia from the Aquitanian epoch until their extinction near the end of the Serravallian epoch. The common name for this genus and their relatives is "ecphora".

Etymology

The name "Ecphora" is Greek, meaning "bearing out." The word was originally used by Vitruvius to signify the projecture of a member or moulding of a column, and here refers to the distinctive "T-shaped" ribs that project from the shell. The prefix "tris" is added to denote how all members of the genus have three ribs.

Subdivisions

As originally proposed by Petuch in 1988, Trisecphora was presented as a precursor subgenus of Ecphora, even though a subgenus can not technically precede the genus that contains it. Later, Petuch would promote Trisecphora to the status of full genus.

List of species

T. chamnessi
T. eccentrica
T. prunicola
T. schmidti
T. tricostata
T. martini
T. scientistensis
T. bartoni
T. smithae
T. patuxentia
''T. shattucki''

Evolution

Trisecphora is one of three daughter genera of the Oligocene to Miocene ecphora Ecphorosycon, the other two being Siphoecphora, and Chesathais. Trisecphora and its sister genera diverged from Ecphorosycon during a speciation event during the Aquitanian epoch in the Chesapeake Bay. During the Langhian epoch, Trisecphora underwent its own speciation event where several species, and the first of a divergent lineage, Ecphora wardi of genus Ecphora, were produced. Species of Trisecphora coexisted with Ecphorosycon, Chesathais, and Ecphora, until the beginning of the Serravallian, when Ecphorosycon went extinct. Trisecphora, itself, would go extinct during the middle of the Serravallian when a warming event killed the last species of that genus and of Chesathais off, as well as extirpating Planecphora.