December 8, 1961', Calypso Sta. 115. 1 9, YPM, 

 Rio de Janeiro. 1 cf 1 9, YPM, Rio de Janeiro 

 Market, M. W. Feingold. 26 cf 29 9, YPM, 

 Rio de Janeiro, M. W. Feingold and C. Moreira. 

 5 cf 3 9, MNHNP-USNM, Baia de Sitio Forte, 

 Ilha Grande, December 9, 1961, Calypso Sta. 119. 



Sao Paulo: 1 cf, USNM, Santos, Septem- 

 ber 12, 1925, W. L. Schmitt. 11 c? 5 9, USNM, 

 Canan^ia, December 16, 1963, V. Sadowsky. 

 1 cf 6 9, USNM, Cananeia, April 1965, V. 

 Sadowsky. 



Santa Catarina: 1 9, USNM, Lagoa da 

 Conceigao, Ilha de Santa Catarina, November 11, 

 1965, E. Tremel. 2 cf 4 9, USNM, Lagoa da 

 Conceigao, Ilha de Santa Catarina, Novem- 

 ber 19, 1965, E. Tremel. 1 9, USNM, Arma?ao da 

 Piedade, Ilha de Santa Catarina, November 19, 

 1965, E. Tremel. 2 cf 2 9, USNM, Arvoredo, 

 Ilha de Santa Catarina, October 9, 1964, C. de 

 Jesus. 



Diagnosis 



Adrostral sidcus broad posteriorly and long, al- 

 most reaching posterior margin of carapace. Me- 

 dian sulcus long, ending immediately anterior to 

 posterior end of adrostral sulcus, and deep along 

 its entire length. Dorsolateral sulcus variable in 

 width, broad to almost closed, narrower in north- 

 ern portion of range of species. Petasma with 

 distal portion of ventral costa increasing gradual- 

 ly in width proximally and turning proximally in 

 arc, unarmed along free border and with elongate 

 group of sharp teeth on attached border; aj^ex of 

 costa free; distal fold forming large auricle with 

 prominent spines; distomedian projection long. 

 Thelycum with anterior process small, posterior 

 process with median carina, if present, located 

 deep l)etween horns of median protuberance; lat- 

 eral plates with anteromedian corners produced to 

 form projections covering posterior j^rocess. 



Description 

 ROSTRUM (fig. 68) 



7—11 8 



Teeth ~z^, mode - (percentage distribution: 



8/2—44, 9/2—43, 7/2—4, 10/2—3, 11/2—3.50, 

 9/1—1, 8/0—0.50, 7/0—0.50, 8/1—0.50; N = 200) 

 -f epigastric; position of ventral teeth variable, 

 first tooth situated from well anterior to slightly 

 posterior to last dorsal tooth; rostrum in larger 

 juveniles reaching base of distal one-third of 

 thickened portion of lateral antennular flagellum; 



attaining maximum length in relation to carapace 



length at 11 to 15 mm. c.l. (ratio ^ as high as 



0.78); decreasing progressively with increasing 



length of shrimp, rostrum reaching distal end of 



first antennidar segment in shrimp 50 mm. c.l. 



r.l. 

 (ratio — j- reduced to about 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 an- 

 terior margin of carapace; rostrum tip about % r.l. 

 Postrostral carina strong, prominent, and long, 

 extending almost to near posterior margin of 

 carapace. Median sulcus deep, sometimes widen- 

 ing either in anterior or posterior half; long, ending 

 near posterior margin of carapace. Adrostral 

 sulcus deep, expanded at level of epigastric tooth, 

 broad, ^ to 13^ width of postrostral carina, and 

 long, continuing posteriorly to end Ks to Ks c.l. 

 from posterior margin of carapace. Adrostral carina 

 prominent and long, same length as adrostral 

 sulcus. 



CARAPACE (fig. 69) 



Length in proportion to total length smaller in 

 juveniles, increasing slightly at about subadult 

 stage. Gastrofrontal sulcus broad, extendmg to 

 about one-sixth c.l.; gastrofrontal carina sharp. 

 Orbito-antennal sulcus wide anteriorly, narrowing 

 posteriorly to below ajjex of hepatic sj^ine, there 

 widening again to base of spine. Gastro-orbital 

 carina pronounced, sharp, occupying approxi- 

 mately posterior four-fifths distance between post- 

 orbital margin and hepatic spine. Antennal carina 

 very prominent. Cendcal sulcus about one-quarter 

 c.l., ending slightly anterior to midlength of 

 carapace. Hepatic carina sharp, i/^ to 1^4 c.l., 

 sloping anteroventrally to end 145 to i4g c.l. from 

 anterior margin of carapace. Antennal spine 

 slender, acute, and long; hepatic spine prominent. 



ANTENNULES 



Lateral flagellum almost tliree-quarters length 

 of antennular peduncle, slightly longer than 

 median flagellum and with articles shorter than 

 those of median flagellum. Anterolateral spine 

 very prominent, long, slender, and sharp. Stylo- 

 cerite acute, reaching slightly beyond midlength 

 of first antennular segment. Prosartema reaching 

 distal end of proximal fifth of second antennular 

 segment. 



566 



U.S. FISH AND WILDLIFE SERVICE 



