FISHERY BULLETIN: VOL. 75, NO. 2 



FIGURE 16. — Ranges of Hymenopenaeus laevis and Hadropenaeus lucasii based on published records and specimens 



personally examined. 



sternite XIII which in the latter is concave ante- 

 riorly, has a usually convex, never emarginate, 

 distal margin. The median lamella also is flanked 

 by paired ridges which are triangular in cross 

 section and as high as the lamella. Furthermore, 

 in//, doris, sternite XIV bears a median protuber- 

 ance which is strongly produced in an elongate 

 projection lying quite close to the lamella. 



Males of//, laevis differ markedly from those of 

 H. nereus in that the petasma of the latter bears a 

 single, large, mesial process distally which, more- 

 over, is subrectangular, directed perpendicular to 

 the main axis of the petasma, and armed with long 

 spines; in addition, the lateral process is directed 

 distomesially instead of extending transversely, 

 and is strongly curved outward. Finally, the distal 

 part of the ventrolateral lobule of the petasma is 

 acuminate instead of subelliptical, and is only 

 slightly inclined toward the ventromedian lobule. 



As previously indicated by Burkenroad (1936) 

 and Crosnier and Forest (1973), females of this 



species exhibit considerable variation in the 

 shape and size of the median lamella on sternite 



XIII. Extending ventrally, it may be short or long, 

 reaching between midheight and slightly beyond 

 the apex of the median protuberance on sternite 



XIV. In the young, the lamella is truncate, and in 

 the adult it ranges from shallow to deeply 

 emarginate distally, forming a fork with the pro- 

 jections varying from rather broadly triangular 

 to spinelike. 



In the young male, as stated above, the petasma 

 bears a minute subdistal spine at the free margin 

 of the costa, and the more mesial of the two distal 

 projections of the ventromedian lobule is at best 

 only slightly developed. 



Remarks. -Burkenroad (1936) presented a de- 

 tailed account of the external morphology and an 

 enlightened analysis of the taxonomic status of 

 this species; as a result, he placed two well-known 

 scientific names, H. microps and H. androgynus, 



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