ARTHROPODA 



165 



Order 2. Stomatopoda 



The Stomatopoda (Gr. aro/xa, mouth, and ttovi, foot) again 

 form a very small order; they are exclusively marine- and live- 

 only in the warmer waters. They are Crustacea of some size 



1 



FlG. 157. Diastylis stygia. Female enlarged six diameters, i, carapace; 2, first antenna ; 

 3, first leg; 4, gill borne on first maxilliped ; 5,6,7,8, second to fifth leg; 9 free portion 

 ut thorax; 10, abdomen ; n, appendage of last abdominal segment. (Alter Sars, from 

 Shipley and MacBride's Zoology.) 



and may attain a length of fifteen centimeters. One of the 

 commonest representatives is Squilla (Fig. 158). The ccphalo- 

 thorax includes only the head and the first five thoracic segments, 

 so that the carapace leaves three segments of the thorax uncov- 

 ered, and these are distinct. The first five pairs of thoracic 



[58. Squilla. «], antennule; a. 2 , antenna; ti r i7 : , abdominal segments; br, gills; 

 cth, cephalothorax ; p, copulatory organ; /> r Av pleopods ; />,;, uropod; VI-VIII, 

 thoracic segments ; 1-8, thoracic appendages. (From Parker and Haswell's Text-book.) 



