Three-dimensionally preserved representatives of Late Jurassic Limulus darwini that can be assigned to three major size classes.
(a) compressed and incomplete prosoma (ZPAL X.1/O-B/XA 5); (b) Markedly incomplete prosoma (ZPAL X.1/O-B/XA 4); (c) slightly incomplete opisthosoma (ZPAL X.1/O-B/XA 6); (d) small, incomplete opisthosoma (ZPAL X.1/O-B/XA 7); (e), (f) Positive (rock slab with imprint) and negative (external mould) of the holotype (ZPAL X.1/O-B/XA 1), preserved as slightly compressed and juxtapositioned prosoma and opisthosoma; (g–i) least-deformed specimen (ZPAL X.1/O-B/XA 2), preserved as a near-complete, medium-sized prosoma; (j–l) flattened, complete prosoma (ZPAL X.1/O-B/XA 3), with exceptionally well-preserved right compound eye.