CHAPTER XIX 



POUCHETIIDAE : POUCHETIA 

 POUCHETIA Schiitt emend. 



Text figures 00-QQ 



Pauchetia Schiitt (1895), in part, pp. 168-170, pi. 26, figs. 92, 94; pi. 27, figs. 97-99; 



(1896), p. 6, fig. 8. 

 Gymnodinium, Pouchet (1885a), in part, pp. 38-39, 85, pi. 2, fig. 1; (18856), i)p. 529- 



531, 534, pi. 3, fig. 4; (1887), pp. 96-97, 112, pi. 10, fig. 1. 

 Pouchetia, Delage and Herouard (1896), in part?, p. 384, fig. 668. 

 Poiichetia, Paulsen (1908), in part, pp. 105-106, figs. 146, 148. 

 Pruchctia, Lohmann (1908), p. 369. Lapsus. 



Diagnosis 



Pouchetiidae with an ocellus located at the left of the intercingular sulcus; 

 no posterior prod ; girdle a descending left spiral of 1.15 to 2 turns ; sulcus with 

 torsion of 0.25 to 1.75 turns of a descending left spiral, its apical looj) with 

 f]'oni to 1.5 turns, and its antapical loop sometimes attaining 1 turn. No 

 paraeingular lines. Ocellus with red or black pigment mass with red, brown, 

 yellow, or colorless central core; lens hyaline, laminate, or of appressed parts 

 or segments. Nucleus usually anterior to ocellus ; perinuclear membrane rarely 

 present; moniliform chromatin threads distinct. Pusules, if present, opening 

 anteriorly into the anterior flagellar pore or posteriorly into the posterior. No 

 nematocysts; surface striae rarely present; plasma generally highly colored; 

 scattered melanin or other pigment granules sometimes present. Holozoic 

 nutrition; encystment in thin-walled membrane frequent. Length, 32-141/*. 

 All marine, eupelagic and from warm temperate or tropical seas; 20 species 

 known. 



Organology 



Pouchetia has about as nuich torsion of the body as CocJilodinium, but with 

 this marked difference, namely, that the sulcus above the proximal and below 

 the distal ends of the girdle is itself continued in a spiral course which may 

 equal or even exceed the amount of torsion within the intercingular part of 

 that organ, whereas in Cochlodiuinm the torsion is mainly in the intercingular 

 region and the apical and antapical loops are never extended to the amount of 

 so much as 0.5 turn. In Pouchetia, on the other hand, either or both of these 

 loops may make as nmcli as a full tui'n about the body, as for example in P. 

 violescens (fig. 00, 1). The apical loop may even make as much as 1.5 turns, 

 as in the species cited. When, however, the girdle of PoHchetia has two full 



[429] 



