Cephalorhyncha nybakkeni (Higgins, 1986)
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Family:  Echinoderidae ()
Max. size:  0.0185 cm TL (female)
Environment:  benthic; marine; depth range 0 - 1 m
Distribution:  Eastern Central Pacific: USA.
Diagnosis:  Mid-dorsal spines on segments 6-10, D 7 twice as long as D 6, 8, and 9, longer than D 10; lateral spines on segments 4, 7-12; lateral terminal spines long, 74.6% of the trunk length; lateral terminal accessory spines (of female) prominent, robust, 24.9% of the trunk length, 35.5% of the lateral terminal spine length; trunk relatively long and narrow, cuticle without evidence of hairs or perforation sites; posterior margin of segments with prominent pectinate fringe, especially in mid-trunk region and most apparent on ventral surface; ventral midline of segment 4 strongly cuticularized, lateroventral articulation zones suggested but not in line with zones of more posterior segments; segment 13 with apparent mid-dorsal articulation zone establishing two bilateral terminal tergal plates (Ref. 335).
Biology:  Inhabits high-energy coarse beach sand (Ref. 335), or coarse calcareous sand (Refs. 1460, 335, 75777).
IUCN Red List Status: Not Evaluated (N.E.) Ref. 123251)
Threat to humans: 
Country info:   
 

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