''Trigonellites'' is an extinct genus of basal

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

, known from two or three species, discovered in outcrops of the

Late Jurassic The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 163.5 ± 1.0 to 145.0 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic strata.Owen 1987. In European lithostratigraphy, the name ...

-aged

Kimmeridge Clay Formation The Kimmeridge Clay is a sedimentary deposit of fossiliferous marine clay which is of Late Jurassic to lowermost Cretaceous age and occurs in southern and eastern England and in the North Sea. This rock formation is the major source rock for North ...

Ely Ely or ELY may refer to: Places Ireland * Éile, a medieval kingdom commonly anglicised Ely * Ely Place, Dublin, a street United Kingdom * Ely, Cambridgeshire, a cathedral city in Cambridgeshire, England ** Ely Cathedral Ely Cathedral, formal ...

and

Cumnor Cumnor is a village and civil parish 3½ miles (5.6 km) west of the centre of Oxford, England. The village is about 2 miles (3.2 km) south-west of Botley and its centre is west of the A420 road to Swindon. The parish includes Cumnor ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

and possibly also an unnamed

Early Triassic The Early Triassic is the first of three epochs of the Triassic Period of the geologic timescale. It spans the time between Ma and Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic Series, which is a un ...

-aged rock formation in

Bindlach Bindlach is a municipality in the district of Bayreuth in Upper Franconia in Bavaria, Germany. The town is adjacent immediately north of the town of Bayreuth. The population count of December 2006 was 7197 inhabitants. History The name Bindlach ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. J. Prestwich. (1879). On the discovery of a species of ''

Iguanodon ''Iguanodon'' ( ; meaning 'iguana-tooth'), named in 1825, is a genus of iguanodontian dinosaur. While many species have been classified in the genus ''Iguanodon'', dating from the late Jurassic Period to the early Cretaceous Period of Asia, Eu ...

'' in the Kimmeridge Clay near Oxford; and a notice of a very fossiliferous band of the Shotover Sands. ''Geological Magazine, new series, decade'' 2 6(5):193-195 It was originally classified as a

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...

,G. A. Goldfuss. (1863). Abbildungen und Beschreibungen der Petrefacten Deutschlands und der angrenzenden Länder. Divisio Quarta: Molluscorum acephalicorum reliquiae. Muschelthiere der Vorwelt. 1.

Bivalvia Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of w ...

. ''Petrefacta Germaniae'' 4(1):1-273 but it has since been classed as an ammonite species. Only two species once placed in the genus are still considered valid today: ''T. latus'' and ''T. curvirostris'', with one dubious species, ''T. simplex'', possibly being a species of '' Lyrodon''. The genus name ''Trigonellites'' was originally proposed for some calcareous plates found in

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ...

oolitic rocks, but these have since been declassed as indeterminate ammonites as the name was never published. The name has since been used to represent two species of

(c.156-151 Ma) ammonites and one

(c.242.7 Ma) species.

References

{{reflist Fossil taxa described in 1811 Jurassic cephalopods Ammonite genera