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Wahpia insolens

An small alga with slender branches

Image of Wahpia insolens.

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Wahpia insolens (USNM 35423) – Syntype. Specimen showing typical mode of branching. Specimen length = 68 mm. Specimen wet – direct light (left), wet – polarized light (right). Trilobite Beds on Mount Stephen.

© Smithsonian Institution – National Museum of Natural History. Photo: Jean-Bernard Caron

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Taxonomy

Kingdom:

Plantae (algae)

Phylum:

Rhodophyta?

Class:

Non applicable

Affinity:

No revisions of this alga have been published since its original description by Walcott (1919) and its affinities remain uncertain.

Species name:

Wahpia insolens

Described by:

Walcott

Description date:

1919

Etymology:

Wahpia – unspecified.

insolens – from the Latin insolens, “unusual, different.” This probably refers to the unusual branches of this alga.

Type Specimens:

Syntypes –USNM35423-35424 (W. insolens); Holotypes –USNM35413 (W. mimica);USNM35425 (W. virgata) in the National Museum of Natural History, Smithsonian Institution, Washington, DC, USA.

Other species:

Burgess Shale and vicinity: W. mimica Walcott, 1919 and W. virgata Walcott, 1919 from the Walcott Quarry.

Other deposits: none.

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Age

Period:

Middle Cambrian, Bathyuriscus-Elrathina Zone (approximately 505 million years ago).

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Localities

Principal localities:

The Walcott Quarry on Fossil Ridge. The Trilobite Beds on Mount Stephen.

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History of Research

Brief history of research:

Wahpia was described by Charles Walcott (1919) as a possible red alga. However, like all the algae from the Burgess Shale, it awaits a modern redescription.

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Description

Morphology:

This simple alga has a long central stem with long narrow branches diverging from it at a 45 degree angle; these branches give rise to smaller branches with up to two additional branchings. The central stem is hollow. W. mimica and W. virgata differ from W. insolens based on size differences of the central stem and the number and flexibility of the branches.

Abundance:

Wahpia is very rare and represents only 0.06% of the Walcott Quarry community (Caron and Jackson, 2008).

Maximum size:

90 mm

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Ecology

Life habits:

Epibenthic, sessile

Feeding strategies:

Primary producer

Ecological Interpretations:

The morphology of this alga suggests it was attached to the sea floor rather than being free floating.

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References

Bibliography:

CARON, J.-B. AND D. A. JACKSON. 2008. Paleoecology of the Greater Phyllopod Bed community, Burgess Shale. Palaeogeography, Palaeoclimatology, Palaeoecology, 258: 222-256.

WALCOTT, C. 1919. Cambrian Geology and Paleontology IV. Middle Cambrian Algae. Smithsonian Miscellaneous Collections, 67(5): 217-260.

Other links:

None

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