CHAPTER XVII 



NOCTILUCIDAE : PAVILLARDIA, NOCTILUCA 

 Family 4. NOCTILUCIDAE Saville-Kent 



Noctiluc-idae Saville-Kent (1880-82). 

 Noctilueidae, Poclie (1913), p. 165. 



Diagnosis 

 G.'siiinodinioiclae characterized by the presence of a tentacle, more or less 

 mo])ile, and withont ocellus. The tentacle arises in the sulcal area and extends 

 posteriorly. In Noctiluca this fundamental relationship is obscured in the 

 large globular form, but is apparent in the small, Gyntnodinmm-like stages. 

 This family contains two genera, Noctiluca Suriray and Pavillardia gen. nov. 



Historical Discussion 



This family was created by Saville-Kent (1880-82) for two genera, Nocti- 

 Juca Suriray and Leptodiscus Hertwig. The latter species is knoAvn in only 

 one stage of its life history. The Giimtiod'nunm or dinoflagellate stage, if such 

 occurs, still remains to be discovered. This fact leaves its generic relations an 

 unsolved ])rol)lem. Further investigation will be required before it can be more 

 detinitely located. We therefore remove it from the family Noctilueidae and 

 place it, with Graspedotella Kofoid, in the family Leptodiscidae Kofoid, in the 

 Cystoflagellata Haeckel. 



Because of its definite dinoflagellate characters of sidcus and girdle and of 

 the Gymnodinium-like stage in its life history Noctiluca is closely allied to the 

 G.^Tnnodinioidae. We therefore place it in that tribe, removing it from the 

 Cystoflagellata Haeckel, a group whose genetic relationships as shown in the 

 Leptodiscidae are still obscure. 



Key to Genera of Noctilueidae 



Gymnodinium-hke girdle and sulcus persistent, reddisli orange pigment present 



Pavillardia gen. nov. 



Gymnodinmm-stage temporary, tentacle retained in huge globular stage Noctiluca Suriray 



PAVILLARDIA gen. nov. 

 Text figure JJ 



Diagnosis. — G.^onnodinioidae with G ij ni nodiniurn-like girdle 

 and sulcus; longitudinal flagellum usually absent; stout, finger- 

 like, mol)ile tentacle directed posteriorlv; no ocellus. T\']je Fig. .t.t. Pavii- 



,, .,, 7. , , 7... ■ ■ lardia tcntaculifcra 



species Favulardia tentaculifera sj). nov. sp. nov. x 500. 



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