219 



(Table 6 contd.) 



Species 



Type of 

 development 



Author 



Ophionotus hexactis 



Viviparity 



Hendler, 1975 



Ophiopyren striatum 



Lecithotrophic 

 larva 



Tyler, 1980 



Ophiopleura borealis 



Planktotrophic 

 larva 



Same 



Ophioceres incipiens 



Viviparity 



Hendler. 1975 



Ophiophrixus spinosus 



Same 



Tyler, 1980 



Ophioplocus esmarki 



Same 



Hyman, 1955 



Ophiotjalfa vivipara 



Same 



Hendler, 1975 



Ophiurolepis gelida 



Same 



Same 



Ophiurolepis martensi 



Same 



Same 



Cryptopelta granulifera 



Same 

 Order Phrynophiurida 



Mortensen, 1933 



Astrotoma waitei 



Viviparity 



Hendler, 1975 



Astrochlamvs bruneus 



Same 



Same 



Gorgonocephalus caryi 



Lecithotrophic 

 larva 



Patent. 1970a 



Gorgonocephalus arcticus 



Same 



Mortensen, 1931 



Gorgonocephalus euchemis 



Same 



Same 



Joining of the basal rods of the skeleton. 



Presence and number of transverse rods issuing from the basal rods. 



Presence of vibratile lobes in the second stage larvae. 



Presence and color of the pigment. 



Length of the larva from body base to tips of arms, perpendicular. 



Distance between tips of the posterolateral arms in the second-stage 



larva. 



Key to Species Based on Larvae at the Pluteus Stage 



(2) 

 (5) 

 (4) 

 (3) 

 (2) 

 (9) 

 (8) 



8 (7). 



Larva with one pair of arms. 

 Larva with two— three pairs of arms. 



Basal rays smooth Amphipholis kochii, Stage I 



Basal rays with spines Ophiura sarsi, Stage I 



Larva with two pairs of arms. 

 Larva with three pairs of arms. 



Basal rays with three short terminal processes 



Amphipholis kochii, Stage II 



Basal rays without terminal processes 



Ophiura sarsi, Stage II 



