Organism · Ray-finned fishes
Mesturus verrucosus
Source time context (not species duration) · ≈ 201–143 Ma
Inferred life reconstruction
Mesturus verrucosus
Overview
Mesturus verrucosus is a Jurassic fish with a striking rounded tail. Preserved head and trunk bones and scales allow comparison of several body regions. Look for a profile different from that of a fish with a deeply forked tail.[1]
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Key facts
The tail also played an important role when this fish was first distinguished from other genera. Although the specimen was poorly preserved, its rounded, unforked tail was described. One small body region became the starting point for a new name.[1]
Time and place
The historical type specimen is Late Jurassic Tithonian material from the Solnhofen area around Eichstätt in present-day Bavaria, Germany. The Jurassic spanned approximately 200–140 million years ago. A 2026 study added new material to the old specimens and reexamined this fish.[1][3]
The time range describes source context, not the complete duration of this species.
Size, form and skeleton
The species description includes the head and trunk skeleton, scales covering the body, and rounded tail. The branching pattern of scale rows is also treated as a feature distinguishing it from related fishes. We can compare the broad tail outline with small, repeated scales.[1]
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Habitat and reproduction
Comparing fish fins involves examining dorsal and rear ventral fins as well as the tail. Earlier literature on the genus Mesturus described low, rounded outlines of the dorsal and anal fins. Reading such genus-level comparisons alongside species-specific tail evidence offers a way to distinguish different kinds of morphological information.[2]
Fossil discovery
In 1895, Woodward illustrated and described a better-preserved specimen of Mesturus verrucosus in detail. The 2026 reassessment also added juvenile material. Comparing a long-established name with new fossils helps investigate growth and classification.[1]
References
- Ebert2026 Mesturidae Nursall1996 from Jurassic England and Germany
- 2020 study — Comparing pycnodont fishes
- International Commission on Stratigraphy (2024) — Geological time chart
- Ebert (2026) — Reassessment of Mesturus and related fishes
- Anquetin·Joyce (2014) — Reassessment of Eurysternum
- Ferrante et al. (2022) — Comparing outlines and scales of Jurassic coelacanths
- Ebert (2026) — Reassessment of Mesturus and related fishes
- 2020 study — Comparing pycnodont fishes
- International Commission on Stratigraphy (2024) — Geological time chart
Research questions
Do all fishes once called Mesturus still belong to the same genus? A 2026 study separated some into the genera Aminiichthys and Goodichthys. Small differences in scale rows and teeth provide clues for redrawing the fish family tree.[1]
Observation
Move your gaze from the rounded tip of the tail toward the head along the rows of scales. Alternating between the broad outline and small, repeated patterns reveals different features used to compare fishes.[1]
Related organisms
Eurysternum wagleriReptiles including birdsSource time context (not species duration) · ≈ 201–143 MaA fish and a turtle from Solnhofen
Mesturus and Eurysternum can be compared through Late Jurassic material known from the Solnhofen area of present-day Germany. Looking at different fossils of a fish and a turtle broadens the story of life in this region.
Undina penicillataCoelacanthsFossil record age bounds · ≈ 152–149 MaTwo fishes in Late Jurassic strata of present-day Germany
Undina penicillata and Mesturus verrucosus are represented by Late Jurassic material from the area of present-day Germany. Compare the extension at the center of Undina’s tail with the rounded tail of Mesturus, and the scales covering both bodies. This connection explores the region’s Late Jurassic record through the outlines of different fishes.