REVISION OF RECENT BAIRDIIDAE 5 



species with similar carapace morphology, but that the distinctions 

 among carapace groups seemed less marked; he suggested that the 

 carapace is more conservative than the soft-part anatomy in this 

 group. He refrained from naming these implied generic categories, 

 believing that a taxonomic system based principally on carapace 

 structures would be more useful. Table 1 summarizes the classifica- 

 tions of Miiller and Kornicker as compared to that proposed below. 



Puri (1964, p. 196) has suggested that at least three groups of 

 "Bairdia" are distinguishable on muscle-scar pattern alone; this 

 opinion is also held by Hulings (pers. comm.) and is certainly supported 

 by the material described below (see Figure 3). 



Kollmann (1963) recognized five subfamilies among Triassic genera 

 belonging to the family Bairdiidae: Bairdiinae Sars, 1923; Alanel- 

 linae Boucek, 1936; Nodobairdiinae Kollmann, 1963; Triebelininae 

 Kollmann, 1963; and Carinobairdiinae Kollmann, 1963. On the basis 

 of external sculpture alone he pointed out that it would be worth- 

 while to revive Glyptobairdia (by a partitioning of Triebelina) for the 

 Recent representative of a lineage that already in the Triassic (Cari- 

 nobairdia) is distinct from and coexists with Triebelina and related 

 genera. Unfortunately, the hingement of Triassic Carinobairdiinae is 

 unknown, but if we postulate that it is at least potentially bairdop- 

 pUatan, then three of Kollmann's subfamilies are represented by 

 Recent genera and might be incorporated into the proposed scheme 

 as tribes (Bairdiini, Triebelinini, Carinobairdiini) wuthin the sub- 

 family Bairdiinae. 



Proposed classification. — On the basis of the species studied, 

 the following categories are readily distinguishable among living 

 Bairdiidae: 



Subfamily Bairdiinae Sars, 1888 



Neonesidea, new genus 



Paranesidea, new genus 



Triebelina Bold, 1946 



Bairdoppilata Coryell, Sample and Jennings, 1935 



B. (Bairdoppilata) Coryell, Sample and Jennings, 1935 

 B. (Glyptobairdia) Stephenson, 1946 

 Subfamily Bythoeypridinae, new subfamily 



Bythocypris Brady, 1880 



Zabythocypris, new genus 



Anchistrocheles Brady and Norman, 1889 



Living Bairdiidae may be separated easily into two subfamilies, 

 Bairdiinae and Bythoeypridinae, which correspond to the form 

 genera "Bairdia" and "Bythocypris" of current usage. Each sub- 

 family may be diagnosed on a characteristic adductor muscle-scar 

 arrangement and is substantiated by consistent patterns of carapace 

 and appendage morphology. The name Bairdiinae is retained here 



