The one that got away…in the Mesozoic


It was a bad day for both the squid, Plesioteuthis, and the Rhamphorhynchus that was skimming over the water, trying to snag dinner. The squid got stabbed by a sharp fang, and the reptile lost a tooth and a meal. We know this because of the beautiful fossil found with a broken off tooth preserved in its mantle.

Plesioteuthis subovata from the Late Jurassic Solnhofen Archipelago. An adult specimen, 28 cm long, preserved with ink sac and duct, arm-head complex, well-preserved mantle musculatures (transverse striation) and a pterosaur tooth. (B) Close-up of the 19 mm long, slightly curved Rhamphorhynchus muensteri tooth crown under normal light. (C) Ultraviolet (UV) light reveals that the tooth apex is partially covered with now phosphatized mantle tissue.

Ouch.

Direct evidence of successful or failed predation is rare in the fossil record but essential for reconstructing extinct food webs. Here, we report the first evidence of a failed predation attempt by a pterosaur on a soft-bodied coleoid cephalopod. A perfectly preserved, fully grown soft-tissue specimen of the octobrachian coleoid Plesioteuthis subovata is associated with a tooth of the pterosaur Rhamphorhynchus muensteri from the Late Jurassic Solnhofen Archipelago. Examination under ultraviolet light reveals the pterosaur tooth is embedded in the now phosphatised cephalopod soft tissue, which makes a chance association highly improbable. According to its morphology, the tooth likely originates from the anterior to middle region of the upper or lower jaw of a large, osteologically mature individual. We propose the tooth became associated with the coleoid when the pterosaur attacked Plesioteuthis at or near the water surface. Thus, Rhamphorhynchus apparently fed on aquatic animals by grabbing prey whilst flying directly above, or floating upon (less likely), the water surface. It remains unclear whether the Plesioteuthis died from the pterosaur attack or survived for some time with the broken tooth lodged in its mantle. Sinking into oxygen depleted waters explains the exceptional soft tissue preservation.

So now we know that Pterosaurs ate soft-bodied cephalopods.

Comments

  1. kingoftown says

    Didn’t realise actual squid (rather than belemites) were around this long ago. I’ve read that they diversified in the Tertiary and evolved in deep water so especially surprised it lived close enough to the surface to be caught by a pterosaur.

  2. Callinectes says

    Does this prove that skimming was the method? I thought it was proved a while back, at least with some species, that the drag would break their necks and cause an immediate crash.

  3. lumipuna says

    The quoted text seems to suggest several possible hunting methods. I’m not sure if PZ even meant “skimming” literally.

  4. monad says

    @4: The article is actually open access. It notes skim-feeding was determined to be too costly in terms of energy, at least for Rhamphorhynchus, so they probably grabbed at things while near or on the water.

Leave a Reply