148 



UNITED STATES NATIONAL MUSEUM BULLETIN 296 



was attacked by barnacles which have since been scoured out, but 

 which appear to be a single species. The array of specimens burrowed 

 along the lower side of the coral and the Spondylus in undiminished 

 numbers. Frequently a local species will attack any heavy shell or 

 coral available. 



A great deal of work remains to be done on the nature of the 

 mechanisms influencing the micro- and macro-distribution of these 

 animals. 



Cryptophialus 

 3T.C. 



Loss of I T.C. 



Trypetesa 

 3 T.C. 



Austral ophialus 

 4 T.C. 



CRyPTOPHIALIDAE 



TRVPETESIDAE 



Balanodytes 

 4 T.C. 



1? 



I Loss of I T.CT 



Berndtia 

 5 T.C. 



t 



Kochlorinopsis 



Kochlorine 



3T.C. + C.A. 



Loss of C.A. 



Loss of C.A. 



With gizzard 



With long labrum 



Loss of C.A. 



Reduced mouth cirrus 



Loss of I T.C. 



Lithoglyptes 

 4T.C.-+-C.A. 



i 



Loss of I T.C. 



Weltrieria 



5 T.C. -f- C.A. 



LITHOGLyPTIDAE 



APYGOPHORA 



PYGOPHORA ^ 

 t 

 ACROTHORACICA 



t 



Iblidae? 



I 



LEPADOMORPHA 



Loss of anus 

 Reduced, uniramous T.C. 



•RHIZOCEPHALA 



-BALANOMORPHA 



-VERRUCOMORPHA 



THORACICA 



t 



ASCOTHORACICA 



t 



Figure 42. — Phylogenetic diagram showing possible relationships of the genera within 

 the order Acrothoracica, and the orders within the subclass Cirripedia. C.A. = caudal 

 appendages, paired; T.C = terminal cirri, number of pairs. 



