Chaetocladus

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Chaetocladus
Fossil range: Middle Ordovician - Devonian^[1]

The holotype of Chaetocladus plumula (USNM 41 137, from LoDuca 1997)

Kingdom:	Plantae
Phylum:	Chlorophyta
Class:	Ulvophyceae
Order:	Dasycladales Pascher 1931
Family:	Triploporellaceae LoDuca 1997
Tribe:	Salpingoporelleae LoDuca 1997
Subtribe:	Chaetocladinae LoDuca 1997
Genus:	Chaetocladus Whitfield 1894 emend LoDuca 1997

Species

C. gracilis

Kenrick & Vither 2006

C. ruedemanni

LoDuca 1997

C. dubius

LoDuca 1997

C. plumula

Whitfield 1894

C. hefteri

Kra¨usel and Weyland, 1962

Chaetocladus is a non-calcifying genus of unicellular green alga known from the Upper Silurian.

1 Morphology
2 Fossil record
3 Classification
4 References

[edit] Morphology

Chaetocladus thalli range from 2-6 cm in height and average 1 cm in diameter.^[2] They comprise a parallel-sided, unbranching axis which is surrounded by leaf-like ramifications.

[edit] Fossil record

Chaetocladus is known from upper Silurian konservat lagerstatte, and found in association with other algae, arthropods, and annelid worms.^[2] Similar Dasycladean algae are reported from late-Ordovician lagerstatte.^[3]

[edit] Classification

Due to its morphological similarity to the extant order Dasycladales, Chaetocladus is considered to be an early cousin of this order. Unlike the majority of Dasycladales, Chaetocladus does not form deposit calcite - therefore it required much rarer taphonomic conditions to be preserved.^[4] Some genera now recognised as Chaetocladus were originally described as Graptolites.^[5]

[edit] References

^ LoDuca, S.T.; Kluessendorf, J.; Mikulic, D.G. (2003). "A New Noncalcified Dasycladalean Alga From The Silurian Of Wisconsin". Journal of Paleontology 77 (6): 1152–1158. doi:10.1666/0022-3360(2003)077[1152ANNDAF]2.
^ ^a ^b LoDuca, S.T. (1997). "The Green Alga Chaetocladus (Dasycladales)". Journal of Paleontology 71 (5): 940–949.
^ Young, G.A.; Rudkin, D.M.; Dobrzanski, E.P.; Robson, S.P.; Nowlan, G.S. (2007). "Exceptionally preserved Late Ordovician biotas from Manitoba, Canada". Geology 35 (10): 883–886. doi:10.1130/G23947A.1.
^ Kenrick, P.; Vinther, J. (2006). "Chaetocladus gracilis n. sp., a non-calcified Dasycladales from the Upper Silurian of Skåne, Sweden". Review of Palaeobotany and Palynology 142 (3-4): 153–160. doi:10.1016/j.revpalbo.2006.03.023.
^ e.g. LoDuca, S.T. (1990). "Medusaegraptus mirabilis Ruedemann as a Noncalcified Dasyclad Alga". Journal of Paleontology 64 (3): 469–474.

v • d • e Early land floræ

Related links	Evolutionary history of plants • Rhynie chert • External link directory

The first...?	Vascular plant, Cooksonia • Tree, Wattieza • Lycopods, the Drepanophycales and the Zosterophylls • Fungus fossil, Ornatifilum • Lichen, Spongiophyton

Enigmatic taxa	Cuticular remains: Cosmochlaina, Nematothallus • A giant fungus? — Prototaxites

Sister taxa	Green algae: Charophyta, from which land plants evolved • Chaetocladus, an early alga

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