REVISION OF THE PENAEID SHRIMP GENUS PENAEOPSIS 

 (CRUSTACEA: DECAPODA) 



IsabeL|Perez Farfante'i 



ABSTRACT 



The genus Penaeopsis, comprising six species, is defined and its relationships discussed. Five of the 

 species occur in the Indo-West Pacific, P balssi, P. eduardoi, P. challengen, P.jerryi. and P. reclacuta, 

 and one. P serrata, on both sidesof the Atlantic. A key for their identification is provided. References, 

 disposition of types, locality records, diagnoses, descriptions, and illustrations for each species are 

 presented. The descriptions, except that of P halsst, are based on material that includes type- 

 specimens. The male of P. challengen, which was not previously known, is described in detail. 

 Intraspecific variation is noted, and distinguishing morphological features as well as affinities are 

 discussed. In addition, geographic and bathymetric ranges are presented, and a graph of depth- 

 temperature relationships of P. serrata in four areas within its range is included. 



A study of the types of the three species of 

 Penaeopsis described by Bate (1881) made 

 obvious not only the need for redescriptions of 

 these specimens, as was pointed out first by Bur- 

 kenroad ( 1934a) and most recently by Ivanov and 

 Hassan ( 1976), but also confirmed thenecessity for 

 a revision of the genus. As stated by Perez Far- 

 fante (1977b), misidentifications, incomplete de- 

 scriptions, and lack of detail in some of the illus- 

 trations presented by Bate ( 1881 , 1888 ) have been 

 responsible for much of the persistent confusion in 

 the recognition of the species of Penaeopsis. The 

 examination of Bate's types and the study of col- 

 lections made during the cruises of 26 research 

 vessels have enabled me to: clarify the problems 

 associated with his work; describe two previously 

 unnamed species (Perez Farfante 1977b, 1979), as 

 well as the male of another that had not been 

 known before; prepare detailed accounts of the 

 remaining members of the genus; and determine 

 intraspecific variation. I have also discussed their 

 affinities and delimited their respective geograph- 

 ic and bathymetric distribution. The distribu- 

 tional studies resulted in the restriction of the 

 range of P. rectacuta and the considerable exten- 

 sion of that of P. serrata, the latter reported by 

 Perez Farfante and Ivanov (1979). 



The species of the genus are benthic and, except 

 in the eastern Pacific where none has been re- 

 corded, occur in the upper part of the continental 



^Systematics Laboratory. National Marine Fisheries Service. 

 NOAA. National Museum of Natural History, Washington, DC 

 20560 



and insular slopes of tropical, subtropical, and cer- 

 tain temperate regions of the world. All species 

 have been found in the Indo-West Pacific, except 

 P. serrata, which is restricted to the Atlantic, 

 where it is present on both the eastern and west- 

 ern slopes. These shrimps are frequent and often 

 abundant components of the catches made be- 

 tween 250 and 600 m, and two of the species are 

 commercially exploited. 



PRESENTATION OF DATA 



In the account of the species, most of the ter- 

 minology used for features of the petasma, 

 thelycum, and appendix masculina follows that 

 proposed by Perez Farfante (1969, 1971). The 

 measurement of rostrum length is the linear dis- 

 tance from apex to orbital margin, that of 

 carapace length (cl) is the distance between orbi- 

 tal margin and the midposterior margin of the 

 carapace, and, finally, that of total length (tl) is 

 the distance from the apex of the rostrum to pos- 

 terior end of the telson. All measurements are 

 made to the nearest 0.5 mm. The petasmata have 

 been described and depicted unfolded, and the il- 

 lustrations made from stained specimens. 



MATERIAL 



Abbreviations of the repositories of the speci- 

 mens examined during this study follow: 



BMNH British Museum (Natural History), 

 London. 



Manuscript accepted June 1979 



FISHERY BULLETIN: VOL 77, NO, 4. 1980. 



721. 



