PEREZ FARFANTE: REVISION OF GENUS PSEUDARISTEUS 



their petasmata are still little developed, lacking cin- 

 cinnuli and apparently exhibiting no specific char- 

 acter. In other species, males of this size may be 

 identified by petasmal features. It seems worth men- 

 tioning that in the 2 males of this species examined 

 by me, the rostrum is slightly longer, 0.48 and 0.47 

 CL, than it is in most of the males of its congeners 

 in which it ranges between 0.25 and 0.45 CL. 



De Man (1911) indicated that the rostral teeth 

 were less prominent in the female holotype of P. 

 sibogae than in the female of P. crassipes ( = P. 

 kathleenae) available to him, and that they were 

 situated in a horizontal line, whereas in the latter 

 "a line uniting the tips of the teeth appears distinctly 

 arcuate". Actually, the arrangement of the teeth in 

 females with the same carapace length varies slight- 

 ly between individuals of the same species, they are 

 usually disposed in an arc, including P. sibogae, but 

 sometimes they are arranged in an almost straight 

 line. De Man also noted that in the holotype of P. 

 sibogae the rostrum is much shorter [RL/CL = 0.75] 

 and less slender than in the female of "P. crassipes". 

 Crosnier (1978), on the basis of the comparison of 

 a female 37 mm CL (RL/CL = 1.07) with the holo- 

 type, believed that the difference in the length of 

 the rostrum seemed invalid, that in the holotype the 

 rostrum was in the process of being generated after 

 having been broken. 



Pseudaristeus speciosus (Bate 1881) 



Figure 19 



Hemipenaeus speciosus Bate 1881:186 [syntypes 1 

 o- 1 9 (BMNH); type-locality: E of Rio de la Plata, 

 Argentina; 36°44'S, 46°16'W; 2,650 fm (4,847 m); 

 2 March 1876; Challenger stn 325]. Bate 1888: 



303, pi. 37, Fig. 3, pi. 44, fig. 3. Murray 1896: 

 388. De Man 1911:26. Estampador 1937:493. 

 Anderson and Lindner 1945:301. Burukovsky 

 1974:48. 

 Hemipeneus speciosus. Faxon 1895:198. 



Ma^eriaL— Argentina Basin— o* syntype (BMNH). 



Diagnosis.— Optic calathus relatively long, mesial 

 margin 1.4 times distal width. Anterolateral carina 

 present. Ventral extremity of cervical carina broad 

 and blunt rather than forming sharp-edged arc. 

 Third article of antennular peduncle in females not 

 expanded laterally. Posterior extremity of hepatic 

 sulcus extending posteriorly subparallel to branchio- 

 cardiac sulcus, instead of turning ventrally. Petas- 

 ma and thelycum unknown. 



Description.— Based on few notes by Bate (1881), 

 my observations of his illustration and examination 

 of the incomplete cephalothorax of the male syntype. 

 Body slender, lacking setae. Rostrum (Fig. 19) in 

 male relatively short, its estimated length 0.40 CL 

 and roughly lanceolate. Rostral plus epigastric teeth 

 3; rostral teeth situated at about 0.35 and 0.75 from 

 orbital margin. Adrostral carina strong almost 

 reaching apex. Antennal spine sharp; branchiostegal 

 spine longer than antennal, acutely pointed. Cervical 

 sulcus reaching but not crossing postrostral carina 

 at about estimated 0.50 CL from orbital margin and 

 well-marked dor sally; accompanying carina weak, 

 its ventral extremity blunt instead of forming sharp- 

 edged arc; postcervical sulcus reaching, but not 

 crossing, postrostral carina at about estimated 0.70 

 CL from orbital margin. Postrostral carina well 

 marked and sharp to cervical sulcus, low and blunt 

 posteriorly. Anterolateral carina (ventral to gastro- 



FlGURE 19 .—Pseudaristetts speciosvs (Bate), syntype o- "total length = 63 mm" (Bate 1881), off east coast of Buenos Aires. Anterior 



part of anterior region, lateral view. Scale = 1 mm. 



335 



