Aalenian

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The Aalenian (pronounced /ɑːˈliːniən/) is a subdivision of the Middle Jurassic epoch of the geologic timescale that extends from about 175.6 Ma to about 171.6 Ma (million years ago). It was preceded by the Toarcian era and succeeded by the Bajocian.

The stage takes its name from the town of Aalen, some 100 km east of Stuttgart in Germany. The town lies at the southwestern end of the Frankischer Jura.

Contents 1 Invertebrate Fauna 1.1 Ammonitids 1.2 Belemnites 2 Vertebrate Fauna 2.1 Thalattosuchians 3 References

[edit] Invertebrate Fauna

[edit] Ammonitids

†Ammonitids of the Aalenian
Taxa	Presence	Location	Description	Images
Abbasites Abbasites platystomus	Confirmed.[1]		The only known species in this Alaskan genus. Abbasites is believed to be ancestral to the ammonite family Otoitidae.	Life restorations of two different ammonite genera.
Ancolioceras	Confirmed.[1]
Asthenoceras	Confirmed.[1]
Bradfordia	Confirmed.[1]
Brasilia	Confirmed.[1]
Bredyia	Confirmed.[1]
Canavarella	Confirmed.[1]
Constileioceras	Confirmed.[1]
Cylioceras	Confirmed.[1]
Euaptetoceras	Confirmed.[1]
Eudmetoceras	Confirmed.[1]
Euhoploceras	Confirmed.[1]
Fontannesia	Confirmed.[1]
Graphoceras	Confirmed.[1]
Haplopleuroceras	Confirmed.[1]
Hyperlioceras	Confirmed.[1]
Leioceras	Confirmed.[1]
Ludwigia	Confirmed.[1]		Synonymous with a modern plant genus.
Malladaites	Confirmed.[1]
Padragosiceras	Confirmed.[1]
Parammatoceras	Confirmed.[1]
Planammatoceras	Confirmed.[1]
Praestrigites	Confirmed.[1]
Pseudammatoceras	Confirmed.[1]
Puchenquia	Confirmed.[1]
Reynesella	Confirmed.[1]
Sonninia	Confirmed.[1]
Spinammatoceras	Confirmed.[1]
Staufenia	Confirmed.[1]
Stephanoceras	Confirmed.[1]
Trilobiticeras	Confirmed.[1]
Tugurites	Confirmed.[1]

[edit] Belemnites

Belemnites of the Aalenian
Taxa	Presence	Location	Description	Images
Belemnopsis	Confirmed.[1]			Belemnites.
Holcobelus	Confirmed.[1]
Homaloteuthis	Confirmed.[1]
Megateuthis Megateuthis gigantea	Confirmed.[1]		This Eurasian species was the largest known Belemnite and could grow to lengths of up to 10 feet.
Paramegateuthis	Confirmed.[1]
Rhabdobelus	Confirmed.[1]
Sachsibelus	Confirmed.[1]

[edit] Vertebrate Fauna

[edit] Thalattosuchians

Thalattosuchia of the Aalenian
Taxa	Presence	Location	Description	Images
Steneosaurus

[edit] References

1. ^ ^{a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am} Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (entry on cephalopoda)". Bulletins of American Paleontology 364: p.560. http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class. 

Jurassic period
Lower/Early Jurassic	Middle Jurassic	Upper/Late Jurassic
Hettangian | Sinemurian Pliensbachian | Toarcian	Aalenian | Bajocian Bathonian | Callovian	Oxfordian | Kimmeridgian Tithonian