Remigolepis armata

Overview

Remigolepis armata is a Devonian fish with hard plates enclosing its head and front body. Behind this armored region, a scaled body and tail continue. Its combination of an armored front and flexible tail is intriguing.^[1]

Key facts

Pectoral fins are not always soft, fan-shaped structures. A pair of appendages covered in hard plates projects from the sides of the body. They reveal the unusual construction of armored fishes called antiarchs.^[1]

Time and place

It is associated with the latest Famennian of the Late Devonian, roughly 370–360 million years ago. The type specimen discussed in a 2008 study is recorded from Andreyevka in the Tula region of present-day Russia. This is one locality used to compare the distributions of ancient fishes.^[1][2]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

Large bony plates enclose the head and trunk at the front. Armored pectoral appendages lie at the sides, while smaller scales continue toward the rear. The size and arrangement of hard structures differ between the front and back of the body.^[1]

One study reconstructed a total body length of approximately 30 cm. The dorsal armor enclosing the trunk was estimated at approximately 15 cm. The tail was added using fossils of a related species, combining the hard front body and tail to reconstruct this Devonian fish.^[3]

Habitat and reproduction

How did the hard front body and flexible rear work together during swimming? The armored side appendages can be compared with the rear body axis. This invites exploration of ancient fishes with structures unlike the fins of fishes today.^[1]

Fossil discovery

The armored plates of type specimen PIN2921/301 are linked to the species name. Moloshnikov’s 2008 study compared the specimen, reconstructions, and the bodies of other antiarchs. The shape of one plate can provide clues to the entire body and its relationships.^[1]

References

1. Moloshnikov2008 — Bodies and classification of Devonian armoured fishes
2. International Commission on Stratigraphy — Geological timescale
3. Moloshnikov (2008), Devonian antiarchs (Pisces, Antiarchi) from central and southern European Russia
4. Stewart et al.2024 — The trunk skeleton of Tiktaalik
5. Shubin et al.2006 — The pectoral fin of Tiktaalik
6. University of Chicago — Tiktaalik and other Devonian fishes

Research questions

How did armored fishes arrange their head and pectoral plates differently? Comparing Remigolepis plates with those of other antiarchs reveals variation within the group. Research also investigates where separate plates fitted on the body.^[1]

Observation

Move your gaze from the head along the large trunk plates to the armored side appendages and tail. Observe the contrast between the hard front body and the scaled rear.^[1]