Megacheira

Megacheira; Temporal range: Cambrian Stage 3–Middle Cambrian PreꞒ Ꞓ O S D C P T J K Pg N Possible Silurian and Devonian records
	Leanchoilia (top), Yohoia (left), Haikoucaris (right) and Fortiforceps (bottom).
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Megacheira; Hou and Bergström, 1997
Groups
	†Tanglangia; †Jianfengiidae Sklerolibyon; Jianfengia; Parapeytoia; Fortiforceps; ; †Kootenichelidae? Kootenichela?; Worthenella?; ; †Cheiromorpha Yohoiida Yohoiidae Yohoia; ; ; Haikoucaris; Leanchoiliida Actaeidae Actaeus; ; Enaliktidae? Enalikter?; Bundenbachiellus ?; ; Leanchoiliidae Alalcomenaeus; Leanchoilia; Oestokerkus; Yawunik; Kanoshoia; ; ; ;

Megacheira ("great hands") is an extinct class of predatory arthropods. They had a pair of short enlarged appendages at the front.^[1] They look like early chelicerates.^[2]^[3]

Most of them lived in marine environments round the world from the lower to middle Cambrian. It looks like they were quite common then. However, one perfectly preserved specimen of Enalikter was found in the Silurian of Herefordshire (England).^[4] Another species (Bundenbachiellus) was found in the early Devonian of Germany.^[5]

References

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Megacheira Temporal range: Cambrian Stage 3–Middle Cambrian PreꞒ Ꞓ O S D C P T J K Pg N Possible Silurian and Devonian records

Leanchoilia (top), Yohoia (left), Haikoucaris (right) and Fortiforceps (bottom).
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Megacheira Hou and Bergström, 1997
Groups
†Tanglangia †Jianfengiidae Sklerolibyon Jianfengia Parapeytoia Fortiforceps †Kootenichelidae? Kootenichela? Worthenella? †Cheiromorpha Yohoiida Yohoiidae Yohoia Haikoucaris Leanchoiliida Actaeidae Actaeus Enaliktidae? Enalikter? Bundenbachiellus ? Leanchoiliidae Alalcomenaeus Leanchoilia Oestokerkus Yawunik Kanoshoia