Camarao rosa : Kichardson and Moraes, 1960 : 8, 

 10-12, 16-18, 32-34, 42, 48, 53, 70, 71, 80, 81 

 [part]; Braga, 1962: 48, 49, 51, tables 1, 2 

 [part] . 



Taxonomic Remarks 



The specimens at the Academy of Natural 

 Sciences of Philadelphia (No. 69) collected ait Kio 

 de Janeiro by W. S. Ruschenberger and recorded 

 by Sliaqj (1893) as P. hrasiliensis are actually two 

 female P. paulensis. 



Study Material 



For list of records see Perez Farfante, 1967. 



Diagnosis 



Adrostral sulcus broad posteriorly and long, al- 

 most reacliing posterior margin of carapace. Me- 

 dian sulcus short, ending well anterior to posterior 

 end of adrostral sulcus, shallow, continuous or in- 

 terrupted, often limited to anterior concavity. Dor- 

 solateral sulcus very narrow. Petasma with ven- 

 tral costa extending proximally in slight curve, or 

 almost straight line, broad and blunt at distal end, 

 with free distal border even or with faintly un- 

 didating flange and bearing group of medium-size, 

 irregularly set teeth close to apex; distal fold rela- 

 tively small, usually armed with spinules. Thely- 

 cum with anterior process small, posterior process 

 verj' narrow and bearing anteriorly bifurcate me- 

 dian carina; lateral plates with anteromedian 



angle markedly divergent, leaving median carina 

 exposed. 



Description 



ROSTRUM (fig. 60) 



Teeth — > mode - (percentage distribution: 

 1-2 2 



7/2—50, 8/2—47, 7/1—1, 8/1—1, 6/2—1; N=100) 

 -f epigastric; position of ventral teeth variable, 

 first tooth situated well anterior to slightly pos- 

 terior to last dorsal tooth; rostrum relatively short, 

 longer in larger juveniles and subadults, reaching 

 at most to distal end of antennular peduncle: 

 maximum length in relation to carapace length 

 apparently obtained at about 20 to 25 mm. c.l. 



r 1 

 (ratio ^^ as high as 0.75) ; decreasing progressively 



c.l. 

 \\-ith increasing length of shrimp, rostrum reach- 

 ing distal half of second antennular segment in 



r 1 

 shrimp 50 mm. c.l. (ratio ^- reduced to about 



c.l. 



0.50) ; rostrum straight apically, often along entire 

 length, occasionally with tip upturned; highest 

 portion of blade at level of third dorsal tooth; 

 latter level with anterior margin of carapace; 

 rostrum tip about M r.l. Postrostral carina strong, 

 prominent and long, extending almost to posterior 

 margin of carapace. Median sulcus shallow, con- 

 tinuous or interrupted, often limited to anterior 

 conca\nty and minute posterior pit, and short, end- 



1 cm. 



Figure 60. — Penaeus (M.) paulensis P6rez Farfante. Rostrum, 9 37.5 mm. c.l., off southernmost end 



Rio Grande do Sul, Brazil. 



556 



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