= Tretosternon sp COOK & ROSS, 1996

Locality: Keymer Tile Works are located south of Burgess Hill (British National Grid Reference TQ 323 193), West Sussex County, England, Southern United Kingdom.

Horizon: Non-Marine Wealden, Lower Weald Clay.

Biostratigraphy:

Age: Late Hautervian Stage, Uppermost Neocomian Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material:

BMB No. 018407: Fragment of shell.

Number: Not given: Fragmentary remains.

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= Tretosternon sp ENSOM, EVANS, & MILNER, 1991

Locality: Sunnydown Farm, NGR SY 9822 7880, Dorset County, England, Southern United Kingdom.

Horizon: Purbeck Limestone Formation.

Biostratigraphy:

Age: Uppermost Tithonian Stage, Uppermost Malm Epoch, Late Jurassic.

Material:

Number: Not given:

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HORNUNG, SACHS & SCHWERMANN, 2023

Locality: Balve Locality, within a quarry north of the local center of Balve-Beckum, North Rhine-Westphalia State, Germany

Horizon:

Biostratigraphy:

Age: Barremian to Aptian Stage, Lower Gallic Subepoch, Middle Early Cretaceous Epoch, Early Cretaceous.

Material:

WMNM uncatalogued: Carapax fragment.

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= cf. Tretosternum MAZIN, BILLON-BRUYAT, POUENCH & HANTZPERGUE, 2006, POUECH, MAZIN & BILLON-BRUYAT, 2006

Locality: Gypsum quarry, Champblanc, Cherves-de-Cognac, northern Aquitanian Basin, Charente Department, France.

Horizon: Purbeckian.

Biostratigraphy:

Age: Berriasian Stage, Lower Neocomian Subepoch, Lowermost Early Cretaceous Epoch, Early Cretaceous.

Material:

CHEm03.365: Fragment of osteoderm.

Number: Not given:

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PEREZ GARCIA, 2009

= "Tretosternum" punctatum ROYO y GOMEZ 1927

Locality: Morella, Castellon de la Plana, Castellon Province, Spain.

Horizon:

Biostratigraphy:

Age: Early Cretaceous.

Material:

MNCN 59503: 53 fragments of plates.

MNCN 59517: Fragment.

Locality: El Bustar, Sierra de Alcarama, La Rioja Province, Spain.

Horizon:

Biostratigraphy:

Age: Early Cretaceous.

Material:

Number: Not given: Fragmentary plate.

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= Tretosternon sp RADLEY, 1994

Locality: Yaverland, Sandown, Isle of Wight County, England, Southern United Kingdom.

Horizon: Upper Wealden Group, Wessex Formation.

Biostratigraphy:

Age: Upper Barremian Stage, Lowermost Gallic Subepoch, Early Cretaceous Epoch, Early Cretaceous.

Material:

Number: Not given: Fragments of carapace and plasteron.

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= Helochelydra? SCHWERMANN, SCHOLLMANN, & POTT, 2018

Locality: Karst fissure fill, near the village of Balve, northern margin of the Rhenish Massif, North Rhine-Westphalia State, Germany.

Horizon:

Biostratigraphy:

Age: Barremian-Aptian Stage, Lower Gallic Subepoch, Middle Early Cretaceous Epoch, Early Cretaceous.

Material:

Number: Not given: Shell fragments.

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