Organism · Animals
Dinomischus isolatus
Source time context (not species duration) · ≈ 520–510 Ma
Inferred life reconstruction
Dinomischus isolatus
Overview
Dinomischus isolatus is a Cambrian organism with a cup-shaped body on a long stalk. A swollen base below connects through the stalk to the upper body. Its striking arrangement resembles a cup placed on a small column.[1]
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Key facts
A ring of rigid bracts surrounds the upper body. The stalk, cup-shaped body, and ring around its rim can each be examined separately.[1]
Time and place
The holotype of Dinomischus isolatus, USNM 198735, and a separate specimen, MCZ 1083, came from the Walcott Quarry. This locality is on Fossil Ridge in present-day British Columbia, Canada. The Cambrian as a whole spanned approximately 540–490 million years ago.[1][3][4][5]
The time range describes source context, not the complete duration of this species.
Size, form and skeleton
A long, continuous stalk rises from a swollen attachment base to connect with the cup-shaped upper body. A ring of rigid bracts surrounds the cup. The lower, middle, and upper regions have different shapes.[1]
The nearly complete specimen ROM32573 is reported to be 28 mm tall.[6]
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Habitat and reproduction
How were the base and upper body connected? A long stalk links the two. Following it upward from the base makes it easier to recognize the sequence of the different body regions.[1]
Fossil discovery
The museum description connects the base, stalk, cup-shaped body, and ring of bracts. It introduces the arrangement of the whole body rather than a single detached part. Different forms are joined within one organism.[1]
References
- Royal Ontario Museum — Dinomischus isolatus
- Paleobiology Database — Age of fossil-bearing strata of Dinomischus
- Royal Ontario Museum — The Burgess Shale locality today
- Royal Ontario Museum — Waptia fieldensis
- International Commission on Stratigraphy (2024) — Geological time chart
- Royal Ontario Museum — Dinomischus isolatus
- Bengtson·Collins(2015). Chancelloriids of the Cambrian Burgess Shale. Palaeontologia Electronica18.1.6A.
- Parks Canada — Mount Stephen trilobite site
- Bengtson·Collins (2015) · Chancelloriids of the Cambrian Burgess Shale
Research questions
Which structures should we examine first in a flower-like outline? In Dinomischus, the cup-shaped body above the stalk and its ring of rigid bracts are distinct. Observation begins with a familiar shape and proceeds to the actual construction of each part.[1]
Observation
Move your gaze upward from the swollen base along the long stalk. Examining the cup-shaped body and surrounding ring of bracts reveals how its structure changes from bottom to top.[1]
Related organisms
Chancelloria erosAnimalsSource time context (not species duration) · ≈ 539–487 MaUnfamiliar bodies in Cambrian seas
Explore the different bodies and records of time preserved in these two organisms. Dinomischus isolatus: Dinomischus isolatus is a Cambrian organism with a cup-shaped body on a long stalk. A swollen base below connects through the stalk to the upper body. The holotype of Dinomischus isolatus, USNM 198735, and a separate specimen, MCZ 1083, came from the Walcott Quarry. This locality is on Fossil Ridge in present-day British Columbia, Canada. Chancelloria: Chancelloria eros had scattered star-shaped sclerites on a club-shaped body that widened upward. It is known from the Cambrian Burgess Shale. The original Walcott specimen series that included Chancelloria eros came from localities near Field in present-day British Columbia, Canada. A 2015 study reassigned this material to three forms and reexamined the existing lectotype, USNM 66524.