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Hey! I'd like some help with some recurring Cotswold brachiopods. Great Oolite group; Middle Jurassic (Bajocian - Callovian). I've grouped them into 4 or 5 species / clades, based on their morphology. Species A - strongly ribbed, crystalline calcite. The specimen in my profile picture! (obviously not a good picture, included to show the great size range) A huge one! Predated upon: Species B: calcite, very spherical, non-ribbed but prominent growth lines Species C: almost completely spherical, unknown mineral, no ribs Species D: small, typically crushed, very flat, no ribs Species E: only a single valve found, very prominent growth lines. is either a bivalve, but it could be part of species B (more prep needed); the shape holds the exact same shape as the upper valve of the other species B items. That's all! @Tidgy's Dad, wanna have a crack? I know you've hunted here before!
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From the album: Cephalopods Worldwide
7cm. From the Callovian at Cotswold Water Park, Gloucester, England.