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Nectocaris
''Nectocaris pteryx'' is a species of possible cephalopod〔 affinity, known from the "early Cambrian" (Series 2) Emu Bay Shale and Chengjiang biota, and the "middle Cambrian" (Series 3, Stage 5) Burgess Shale.
''Nectocaris'' was a free-swimming, predatory or scavenging organism. This lifestyle is reflected in its binomial name: ''Nectocaris'' means "swimming shrimp" (from the Ancient Greek , ', meaning "swimmer" and , ', "shrimp"; , ', means "wing"). Two morphs are known: a small morph, about an inch long, and a large morph, anatomically identical but around four times longer.〔
== Anatomy ==
''Nectocaris'' had a flattened, kite-shaped body with a fleshy fin running along the length of each side.〔 The small head had two stalked eyes, a single pair of tentacles, and a flexible funnel opening out to the underside of the body.〔 The funnel often gets wider away from the head. Internally, a chamber runs along the body axis, containing a pair of gills; the gills comprise blades emerging from a zig-zag axis. Muscle blocks surrounded the axial cavity, and are now preserved as dark blocks in the lateral body.〔 The fins also show dark blocks, with fine striations superimposed over them. These striations often stand in high relief above the rock surface itself.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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