PEREZ FARFANTE: REVISION OF PENAEID SHRIMP GENUS PENAEOPSIS 



jection, which is straight in most specimens, some- 

 times exhibits a shallow emargination. Finally, 

 the tooth on sternite XII may vary considerably in 

 size and shape; although usually compressed, it 

 may be subconical or infrequently strongly pro- 

 duced in an apical spine. Sometimes the entire 

 range of variation of certain characters is rep- 

 resented within a single lot. Among the 16 speci- 

 mens collected at Albatross stn 5197, off western 

 Bohol, Philippines, the number of rostral teeth 

 ranges from 11 to 17 and in several lots females, in 

 which the posteromedian projection of sternite 

 XIII is straight caudally were found together with 

 others bearing a slightly emarginate one. These 

 variations, thus, are intraspecific, not even as- 

 sociated with local populations. 



A discussion of the features that separate this 

 species from P. eduardoi was presented by Perez 

 Farfante ( 1977b). As noted by Hall ( 1962), typical 

 P. rectacuta possesses longer pereopods than do 

 specimens reported by De Man (1911) as 

 "Parapenaeus rectacutus," which actually are 

 Penaeopsis eduardoi. In P. rectacuta, however, the 

 third maxilliped is slightly shorter than that of 

 P. eduardoi. 



Remarks. — The specimens from off Borneo re- 

 corded by Hall (1962) as P. rectacuta were in my 

 opinion, correctly identified. The suggestion by 



Ivanov and Hassan ( 1976) that they might belong 

 to P. balssi — under the synonymy of which the au- 

 thors, "with some hesitation," included the record 

 preceded by a question mark — is not justified. I 

 have found that the petasmata of these specimens 

 are typical and the thelyca vary but slightly from 

 that of the holotype. The only obvious difference is 

 that in the females, the median ridge of the plate of 

 sternite XIV, although broadest posteriorly, is not 

 flasklike. Also, this plate is rather densely setose 

 laterally, as indicated by Ivanov and Hassan, and 

 the transverse thoracic ridge bears a row of setae 

 across the anterior border which is lacking in the 

 holotype; it is probable that in the latter the setae 

 have been lost, as have almost the entire rostrum, 

 telson, and at least part of the appendages during 

 or after capture. 



Perez Farfante (1978) described three speci- 

 mens found in the waters of the Philippines hav- 

 ing gonopores on the coxae of the fifth pair of 

 pereopods and both male and female genitalia. 

 The petasma, appendix masculina, and thelycum 

 of the three exhibit unique features, but in most 

 respects these shrimp are markedly similar to 

 members of P. rectacuta. It was concluded that 

 they are probably anomalus intersexes of this 

 species. Recently, Boris G. Ivanov of VNIRO, 

 kindly made available to me three specimens 

 (two males and one female; Figures 26A-C; 27) 



FIGURE 26. 



-Penaeopsis rectacuta. ? 21 mm cl, S of Timor Island. Timor Sea. A. Petasma, dorsa) view. B, Ventral view. C, Right 

 appendix masculina, dorsal view. Scales: A,B =2 mm; C = 1 mm. 



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