Genus: Atychodracon SMITH, 2015
Etymology: Greek, atychis, "unfortunate"; chosen because the holotype material of the type species was destroyed during a WWII air raid in 1940, and Greek, drakon, "dragon."

Species: megacephalus (STUTCHBURY, 1846) SMITH, 2015
Etymology: Greek, mega, "large" and Greek, kephale, "head."
= Plesiosaurus megacephalus STUTCHBURY, 1846
= Plesiosaurus megacephalus (sic) recte megacephalus STUTCHBURY, 1846, ANON, 1851
= Thaumatosaurus megacephalus (STUTCHBURY, 1846) LYDEKKER, 1889
= Eurycleidus megacephalus (STUTCHBURY, 1846) ANDREWS, 1922
= Rhomaleosaurus megacephalus (STUTCHBURY, 1846) CRUICKSHANK, 1994

Holotype: BRSMG Cb2335

Locality: Street on Fosse, Somersetshire County, England, Southern United Kingdom.

Horizon:

Biostratigraphy: Schlotheimia angulata zone?.

Age: Sinemurian Stage, Lower Lias Epoch, Early Early Jurassic.
Note: Lower Hettangian planorbis Zone of Barrow, STORRS, 1994.

Material: Skull and skeleton.
Note: Lost.

= Atychodracon megacephalus (STUTCHBURY, 1846) SMITH, 2015
Etymology

Neotype: LEICS G221.1851

Locality: Barrow upon Soar, NGR SK 57 17, Leicestershire County, England, Southern United Kingdom.

Horizon: Bottom Floor Limestone.

Biostratigraphy:

Age: Sinemurian  Stage, Lias Epoch, Early Jurassic.

Material: Skull and skeleton.

Referred material:

CRUICKSHANK, 1994

WARMS G10875: Fragmentary skeleton.

NMING F10194: Skull and fragmentary skeleton.

 

= Thaumatosaurus megacephalus (STUTCHBURY, 1846) HUENE, 1921

Locality: Baden-Wurttemberg State, Germany.

Horizon:

Biostratigraphy:

Age: Lower Lias Epoch, Early Jurassic.

Material:

INV. No. 18771: Fragmentary left ischium and vertebrae.

 

PERSSON

Locality: Kanonenberg, near Halberstadt, Saxony-Anhalt State, North Central Germany.

Horizon:

Biostratigraphy: Psilocers planorbe zone.

Age: Lower Lias Epoch, Early Early Jurassic.

Material:

Number: Not given: Skull and skeleton.

 

cf. megacephalus REIFF

Locality: Pfrondorf, Baden-Wurttemberg State, Germany.

Horizon: Psilontenkalk.

Biostratigraphy:

Age: Early Jurassic.

Material:

Tubingen Geol. Univ.-Inst: Left ischium.

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