GENUS ENTOMACRODUS — SPRINGER 



117 



Entomacrodus vomerinus differs from all the other members of its 

 group in usually having a higher number of soft dorsal and anal rays 

 and more vertebrae. It differs: from E. textilis and E. caudofasciatus, 

 in lacking a humeral blotch, and from the latter of these two in usually 

 having a higher number of gill-rakers; from E. cadenati, in not having 

 the lip stripes broken into spots and in lacking the peculiar well- 

 developed markings on the head of that species; from E. chiostidus, 

 E. sealei, and E. corneliae, in rarely having any of the pores of the 

 preopercular series paired; from E. chiostidus and E. sealei, in having 

 proportionately shorter supraorbital and nuchal cirri; from E. chi- 

 ostidus also, in having fewer lip stripes, and from E. sealei, in having 

 the pale areas between the lip stripes broader than the stripes. 



The syntypic material of S. vomerinus in the Paris museum com- 

 prises eight specimens, all previously catalogued as MNHN 3082. 

 I here designate one of these eight specimens lectotype. The lecto- 

 type retains the original catalog number. The paralectotypes are 

 now MNHN B2526. The lectotype is a male, approximately 69 

 mm SL, with the following characters: dorsal, XIII, 17; anal, II,18S; 

 predorsal commissural pores 4; vomerine teeth 6; pseudobranchial 

 filaments 6. 



Distribution (fig. 9). — Entomacrodus vomerinus is known from the 

 coast of Brazil from Natal to Bahia, and from the island of Fernando 

 de Noronja. One specimen, MCZ 4637, collected by Agassiz and 

 Bourget on the Thayer Expedition, is labeled as having come from 

 Para. The best known "Para," of which there are many, is another 

 name for Belem in the north of Brazil on the Para River. Although 

 the Thayer Expedition visited Belem, it is doubtful that they obtained 

 an Entomacrodus there as none of the species of this genus have been 



TABLE 52. — Frequency distribution of number of predorsal commissural pores of 

 specimens of Entomacrodus vomerinus arranged by SL classes (in mm) 



Classes 



35-39.9 



4-0 



45 



50 



55 



60 



65 



70 



75 



80-89.9 



90 



100 



3 4 5 



Number of pores 

 6 7 8 9 10 11 12 13 14 15 16 



Average 



5.0 

 4.6 

 5.4 

 5.2 

 6.4 

 6.8 

 6.3 

 6.9 

 7.1 

 7.1 

 6.5 



