MARINE GAMMARIDEAN AMPHIPODA 251 



All Ampeliscidae have pereopod 5 shorter than 4 and of different 

 structure, similar to all Phoxocephalidae and some Haustoriidae. 

 Unlike the burrowing Phoxocephalidae and Haustoriidae, the Am- 

 peliscidae have glands in pereopods 1-2 that secrete a substance 

 used for the formation of tubes. Ampeliscidae never have multiple 

 ommatidia in the eyes as in Phoxocephalidae and Haustoriidae but 

 form cuticular lenses. They have elongate, laterally compressed 

 heads. Unlike phoxocephalids and haustoriids, Ampeliscidae lack 

 any trace of an accessory flagellum. The accessory flagellum of 

 Carangolia is vestigial but the animal is otherwise clearly an 

 haustoriid. 



Oedicerotidae, with fossorial pereopods and always mth vestigial 

 or absent accessory flagella resemble a few haustoriids, but Oedicero- 

 tidae always have pereopod 5 very elongate, uropod 3 A\dth elongate 

 peduncle, elongate subequal rami and linguiform, entire (rarely 

 emarginate) telson. 



A major division of the key to genera concerns the absence of 

 pereopodal dactyls. The ends of those legs often are highly spinose 

 and if one of the "spines" is not elongate nor obviously distinct from 

 the others then dactyls are considered to be absent. 



Nomenclatural Changes for Haustoriidae 



See Bousfield (1965) for specific nomenclatural changes. 

 Haustoriopsis Schellenberg (1938) is removed to the Prophliantidae. 

 Urothoe simplignathia J. L. Barnard (1962d) is removed to Par- 



daliscella, Pardaliscidae. 

 Note the comments in the Calliopiidae on the genus Sancho. 



Haustoriids are perhaps the most interesting group of amphipods 

 and so diversified that by necessity many genera have been illus- 

 trated herein. 



Key to the Genera of Haustoriidae 



1 . All of pereopods 1-5 lacking dactyls (fig. 996) • 2 



Some of pereopods 1-5 bearing dactyls (fig. 98a) ^ 9 



2. Pereopod 2 smaller than and morphologically distinct from pereopod 1 



(its orientation apparently reversed) Eohaustorius 



Pereopods 1-2 subequal in size and morphologically intersimilar .... 3 



3. Maxillipedal palp with four articles 4 



Maxillipedal palp with three articles 5 



1 See explanation in text (p. 251). 



285-135 O - 69 - 17 



