Dactylioceras semicelatum ammonite fossil - Whitby, North Yorkshire Jurassic Coast

Generally oval whorl section although extremely variable species (from compressed/flattened to very depressed/thick forms).  Straight (or gently convex), relatively fine, well defined, dense ribbing. Ribs run straight or slightly bent forward across the top (venter).  Maximum size ~11cm, average size ~7cm.

Actual ammonite size: 4.8cm

Age (lithology): Upper Lias; Toarcian; Tenuicostatum zone, Semicelatum subzone

Distribution: Staithes, Port Mulgrave, Runswick, Kettleness, Sandsend, Hawsker.

Occurrence: uncommon (although some destinations much more so than others)