''Trigonellites'' is an extinct genus of

basal Basal or basilar is a term meaning ''base'', ''bottom'', or ''minimum''. Science * Basal (anatomy), an anatomical term of location for features associated with the base of an organism or structure * Basal (medicine), a minimal level that is nec ...

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-aged Kimmeridge Clay Formation in

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, England and possibly also an unnamed Early Triassic-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. J. Prestwich. (1879). On the discovery of a species of '' Iguanodon'' in the Kimmeridge Clay near Oxford; and a notice of a very fossiliferous band of the

Shotover Sands Shotover is a hill and forest in Oxfordshire, England. The hill is east of Oxford. Its highest point is above sea level. Early history The toponym may be derived from the Old English , meaning "steep slope". Shotover was part of the Wychwood ...

. ''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. ''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 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 Late Jurassic (c.156-151 Ma) ammonites and one Early Triassic (c.242.7 Ma) species.

References

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