Aramidae
Bird family with one living species and several fossil relatives.
The bird family Aramidae belongs to the order Gruiformes. Today, only one living species exists: the limpkin (*Aramus guarauna*). However, the fossil record contains several other members, including *Papulavis annae* from France’s Eocene, *Aramus paludigrus* from Colombia’s Middle Miocene, and *Badistornis aramus* from South Dakota’s Oligocene. A European Oligocene fossil, *Parvigrus pohli*, shows a mix of traits found in both limpkins and cranes. It was much smaller than either group and had proportions more like a rail. In the study describing this fossil, Gerald Mayr proposed that *Parvigrus pohli* resembled the ancestral species of the Grues (the group containing cranes and limpkins). He suggested that limpkins evolved their extremely long bills as a specialization for feeding on snails, while cranes developed long legs for walking and probing in open grasslands. Another fossil, *Anisolornis* from Argentina’s Miocene, was first described as a phorusrhacid but has since been placed in Aramidae, though it has also been linked to Galliformes and Psophiidae. *Gnotornis aramiellus*, from South Dakota’s Oligocene, was originally assigned to Aramidae but may actually be a heron. Two other early supposed members, *Aminornis* and *Loncornis* from Argentina’s early Oligocene, are no longer considered part of Aramidae: *Loncornis* appears to be a misidentified mammal bone, and *Aminornis* has been reclassified under Anseriformes.
- Classification
- Bird family in order Gruiformes
- Extant species
- Aramus guarauna (limpkin)
- Fossil species
- Papulavis annae, Aramus paludigrus, Badistornis aramus
- Earliest fossil epoch
- Eocene (France)
- Geographic range
- Europe, South America, North America
Lore & Background
The family Aramidae is known primarily from the living limpkin, but the fossil record includes species such as Papulavis annae from the Eocene of France, Aramus paludigrus from the Middle Miocene of Colombia, and Badistornis aramus from the Oligocene of South Dakota, USA. Another Oligocene fossil from Europe, Parvigrus pohli, was described as a mosaic of features shared by limpkins and cranes; it was much smaller than either group and more rail-like in proportions.
Reader's Guide
The significance of Aramidae lies in its position within the Gruiformes and its relationship to cranes. The fossil Parvigrus pohli, described by Gerald Mayr, was suggested to be similar to the stem species of the Grues (cranes and limpkins). Mayr proposed that limpkins evolved massively long bills as a specialization for feeding on snails, while cranes evolved long legs for walking and probing on open grasslands. Other fossils have been assigned to Aramidae with varying certainty: Anisolornis from the Miocene of Argentina was originally described as a phorusrhacid but later considered within Aramidae, though it has also been allied with Galliformes and Psophiidae. Gnotornis aramiellus from the Oligocene of South Dakota was originally placed in Aramidae but may be a heron. Two supposed early members, Aminornis and Loncornis from early Oligocene deposits in Argentina, are no longer thought to belong to Aramidae; Loncornis appears to be a misidentified mammal bone, and Aminornis was reassigned to Anseriformes. These uncertainties highlight the challenges in reconstructing the family's evolutionary history.
Did You Know?
- The only living member of Aramidae is the limpkin (Aramus guarauna).
- The fossil Parvigrus pohli from the Oligocene of Europe was described as a mosaic of features shared by limpkins and cranes.
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