REVISION OF CARCHARHINID SHARK GENERA — SPRINGER 611 



NMV [no number] (1 : 410). Puerto rico: west of El Mario, USNM 

 196613 (1: 472). virgin islands: Booby Rock, St. John, USNM 

 179846 (1: 851). saba bank [island]: RNH 9270 (3: 380-390, 

 embryos). Grenada island: BMNH 1904.6.24.1 (1: 501). Mar- 

 tinique island: MNHN 1143 (1: 444). Honduras: USNM 44470 

 (1 : 303) . PANAMA : off reef at Ft. Sherman, AMNH 1 1413B (1 : 333) ; 

 Col6n, market, USNM 79324 (1: 376). Venezuela: Caracas Bay, 

 RNH 23321 (1: 575). brazil: MNHN 3467 (1: ca. 1050, stuffed); 

 Pernambuco, MCZ 714 (2: 340-376); Recife, high sea, SU 52747 (1: 

 343), SU 52857 (2: 390-434), SU 52858 (1: 397), SU 52859 (1: 366), 

 SU 52860 (1: ca. 482); Bahia, USNM 43357 (1: 510), MNHN 1144 

 (1: 644), BMNH [no number] (1: 432); Rio de Janeiro, BMNH 

 1923.7.30.1 (1: 415), BMNH 1903.6.9.130-132 (2: 488-540), MCZ 

 720 (1: 357), MCZ 432 (2: 413-476), MCZ 160 (1: 514); Marica, SU 

 52748 (1 : ca. 388) ; Santos, Httoral of Sao Paulo, SU 52861 (1 : 433) ; 

 Maceio, SU 8446 (2: 370-399). Uruguay: Maldonado, MCZ 525 

 (1: 460), NMV [no number] (1: 472). 



Rhizoprionodon {Rhizoprionodon) longurio (Jordan and Gilbert) 



Figure 9 



Carcharias longurio Jordan and Gilbert, 1882, Proc. U.S. Nat. Mus., vol. 5, p. 106 

 (Mazatldn). 



Diagnosis. — Upper labial furrow well developed, 2.1-2.6 percent of 

 t.l. ; precaudal centra markedly elongate in posterior monospondylous 

 region (as in plate 2a); precaudal vertebrae ranging from 12 less to 8 

 more than caudal vertebrae; anterior margin of pectoral fin usually 

 equal to, or shorter than, total length of first dorsal fin (27 out of 32 

 specimens); snout in front of nostrils 5.1-6.0 percent of t.l. in speci- 

 mens less than 575 mm. t.l., 4.5-5.0 percent of t.l. in specimens over 

 575 mm. t.l.; total teeth in outer row of upper jaw usually 27 or 29 

 (29 specimens; 28 or 30 in 3 specimens); total teeth in outer row of 

 lower jaw 26 (21 specimens; 27 or 28 in 11 specimens); total enlarged 

 hyomandibular pores on both sides of head usually more than 16 

 (32 out of 33 specimens) ; first dorsal origin usually over, or slightly 

 in advance of, level of appressed pectoral inner corner, infrequently 

 slightly behind level of inner corner; origin of second dorsal fin occurs 

 above posterior thkd of anal base and always in advance of anal axil; 

 tip of appressed pectoral fin reaches to below level of anterior one- to 

 two-thirds of first dorsal base. Males maturing at sizes over 600 mm. 



Description (see also table 14). — Precaudal vertebrae 68-86; 

 caudal vertebrae 73-85; total vertebrae 146-167; upper teeth 13-1-13 

 to 15-1-14; lower teeth 13-13 to 14-14 (higher and lower counts 

 usually correlated) ; cusps of some upper teeth in large specimens 

 slightly serrulate; cusps of lower teeth adumbrating this condition; 



