Piscocrestus argentinensis: The Crested “Fish-Eating Raptor” from Patagonia with Super-Strong Arms

Paleontologists have described Piscocrestus argentinensis, a new piscivorous theropod from the Late Cretaceous of southern Argentina that combined a striking cranial crest with extraordinarily powerful forelimbs — revealing a highly specialised fish-hunting lifestyle unlike any previously known dinosaur.

The partial skeleton, including a distinctive skull with a tall, sail-like crest and robust humerus and radius, was recovered from the Allen Formation in Río Negro Province. Dated to approximately 70 million years ago, the animal reached about 4–5 metres in length and weighed around 300 kg. Its teeth were conical and recurved, ideal for grasping slippery prey, while the mᴀssive forelimbs — stronger than those of any other theropod of similar size — suggest it could wade into shallow rivers and lakes to snatch fish with ᴅᴇᴀᴅly precision.

Published in Cretaceous Research (June 2026) by an Argentine–American team led by Matías Motta, the study shows Piscocrestus belonged to a new lineage of spinosaurid-like theropods that evolved independently in South America. The crest likely served for display or thermoregulation, while the powerful arms enabled a heron-like strike or even brief underwater pursuit.

Named “fish crest” in reference to its diet and ornamentation, Piscocrestus argentinensis highlights the incredible ecological diversity of Patagonian dinosaurs just before the asteroid impact. The holotype is now on display at the Museo Paleontológico Egidio Feruglio in Trelew.

This discovery proves that some theropods became dedicated aquatic hunters with specialised anatomy — a remarkable case of convergent evolution with modern crocodiles and herons.