NO. D BARNARD: AMPHIPODA 



71 



Remarks: Both Dahl (1959) and J. L. Barnard (1961b) have dis- 

 cussed or given keys to the ambasialike lysianassid genera. Barnard 

 erred in his assignment of Ambasiopsis robustus, which should be trans- 

 ferred to Schisturella {—S. robusta (Barnard)). Dahl's Schisturella 

 galatheae should be transferred to Neoambasia, temporarily. That spe- 

 cies has a long first coxa and lacks a notch on the inner ramus of 

 uropod 2. Dahl's species differs from N. tumicornis by the w^ell-devel- 

 oped spines on the outer plate of maxilla 1. 



Schisturella is also characterized by a short, subconical, posterior 

 process on the third article of antenna 2, which in one new species 

 to follow is obsolescent. 



Lakota rotundata (K, H. Barnard, see J. L. Barnard 1962d) keys 

 to Neoambasia but it differs from that genus as does S. galatheae in the 

 well-developed spines on the outer plate of maxilla 1 and in the con- 

 striction on the inner ramus of uropod 2. I retain that species in Lakota 

 {—Anonyx) but one must note its transition to Neoambasia and the 

 probability that it is a member of the genus Pseudonesi?nus Chevreux. 

 The latter genus may be synonymous with Schisturella. 



Chironesimus has been fused with Anonyx by Gurjanova (1962) 

 and the genus Lakota Holmes revived to include C. rotundata. As noted 

 elsewhere, this is a course difficult to put into practice. Hurley (1963) 

 has wisely included Lakota with Anonyx. 



Key to Species of Schisturella 



1. Third pleonal epimeron with tooth at posteroventral 



corner 2 



1. Third pleonal epimeron rounded-quadrate posteriorly 3 



2. Eyes present, palm of gnathopod 1 very oblique, 



obsolescent cocula, n. sp. 



2. Eyes absent, palm of gnathopod 1 transverse zopa, n. sp. 



3. Palm of gnathopod 1 subtransverse, distinct from 



posterior margin of article 6, eyes absent robusta 



3. Palm of gnathopod 1 very oblique, barely distinct 

 from posterior margin of article 6, eyes 

 present pulchra 



Ambasiopsis robustus J. L. Barnard (1961b) is removed to Schisturella, 

 becoming S. robusta (Barnard). 



Schisturella galatheae Dahl ( 1959) is removed to Neoambasia. 



