8 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
with the characteristic carination of the carapace, thorax, and abdo- 
men, the general features of the carapace, claw, abdomen, telson, and 
uropod are similar in all of the stomatopods. 
We have included sketches and a brief descriptive account of the 
male petasma (endopod of the first male pleopod) for all species 
represented by adult males. 
Order STOMATOPODA Latreille, 1817 
Until recently, this order was considered to include but one Recent 
family, Squillidae Latreille, 1803, with eight Recent genera. Studies 
on the classification of stomatopods by Seréne (1962), Holthuis (1964), 
and Manning (1963, 1968a), have shown that the stomatopods com- 
prise four families and 87 genera. The classification proposed by 
Manning (1968a) is used herein; that paper includes keys to all genera. 
For more detailed information on the order, the reader is referred to 
Balss (1938). 
Representatives of three of the four families of stomatopods occur 
in the northwestern portions of the Indian Ocean; these three families 
may be distinguished by means of the key given below. The fourth 
family, Bathysquillidae, includes one deep-water genus, Bathysquilla 
Manning, with one Indo-West Pacific species known to occur off 
Japan and South Africa. 
Key to Families of STOMATOPODA Occurring in the 
Northwestern Indian Ocean 
1. Propodi of third and fourth thoracic appendages broader than long, beaded 
ventrally (fig. 3d); telson lacking sharp median carina. 
LyYSIOSQUILLIDAE, p. 8. 
Propodi of third and fourth thoracic appendages longer than broad, not 
beaded ventrally (fig. 9b); telson with sharp median carina ...... 2 
2. No more than 2 intermediate marginal denticles present on telson. 
GONODACTYLIDAE, p. 14. 
More than 4 intermediate marginal denticles present on telson. 
SQUILLIDAE, p. 28. 
Family LysiosQuiLLipaE Giesbrecht, 1910 
Diaenosis.—Propodi of third, fourth, and fifth thoracic appendages 
broader than long, beaded or ribbed ventrally (fig. 3d); telson lacking 
longitudinal median carina on dorsal surface (fig. 40). 
Discusston.—Representatives of two of the genera currently 
assigned to this family occur off West Pakistan; they may be dis- 
tinguished by means of the following key. 
