Harpagofututor volsellorhinus
- 演化之聲
- Mar 18
- 2 min read
Age
Carboniferous（Serpukhovian）
324-318 Ma
Taxonomy
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Chondrenchelyiformes
Genus: Harpagofututor
Species: Harpagofututor volsellorhinus
Morphological Description
The fossil specimens of Harpagofututor volsellorhinus reach a maximum body length of approximately 17 cm. The body is elongate and eel-like in appearance. Males possess a pair of ethmoid claspers on the head.
Etymology
harpagos-: hook or grappling claw
-fututor: copulator
volsello-: forceps or pincers
-rhinus: nose
Biological Description
Harpagofututor volsellorhinus is a chondrichthyan fish from the Carboniferous Mississippian, discovered in the Bear Gulch Limestone of Montana, USA.
This species exhibits clear sexual dimorphism, with marked differences between males and females. In males, a pair of ethmoid claspers extends anteriorly from the ethmoid region of the skull. These structures are distally bifurcated and bear tooth-like projections. Their high degree of calcification suggests a rigid structure. They were likely used during mating to grasp or secure the female, preventing escape, while the denticle-like projections may have enhanced grip. These claspers may also have played a role in display during courtship, or in defense and male-male competition for mating opportunities.
Fossil evidence reveals embryos at different developmental stages preserved within female individuals, indicating that this species was a viviparous fish exhibiting superfoetation, with multiple broods developing simultaneously. This reproductive strategy also implies internal fertilization.
The dentition consists of tooth plates adapted for crushing hard prey. This suggests a durophagous feeding strategy, most likely preying on shelled organisms or small animals with hard exoskeletons. The body form is elongate and eel-like, with a continuous dorsal fin extending toward the tail. Locomotion was achieved through undulatory movements of the body in the water.
（Author: Shui-Ye You）
References
Lund R. (1982). Harpagofututor volsellorhinus new genus and species (Chondrichthyes, Chondrenchelyiformes) from the Namurian Bear Gulch Limestone, Chondrenchelys problematica Traquair (Visean), and their sexual dimorphism. Journal of Paleontology
Grogan ED and Lund R. (2011). Superfoetative viviparity in a Carboniferous chondrichthyan and reproduction in early gnathostomes. Zoological Journal of the Linnean Society.
46.9097, -110.3894
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