FISHERY BULLETIN: VOL. 83, NO. 1 



Figure 53 . —Sicyoma disdorsalis (Burkenroad), ? 25 mm cl, Golfo de Fonseca, El Salvador. Lateral view. Scale = 10 mm. 



ventral apical tooth smaller than dorsal and 

 placed almost at same level or, more often, pos- 

 terior to it. First rostral tooth located well in ad- 

 vance of orbital margin, between 0.18 and 0.33 

 (mean 0.25) rl; second tooth from 0.45 to 0.70 

 (mean 0.58) rl; and third from 0.75 to 0.96 (mean 

 0.81) rl. Adrostral carina extending to near tip, 

 relatively far from ventral margin, often slightly 

 arched either along middle or less often anteriorly, 

 and occasionally directed anterodorsally. 



Carapace with postrostral carina well marked 

 but low throughout its entire length, bearing two 

 teeth: 1) epigastric tooth small, subequal to or 

 slightly larger than first rostral tooth and situated 

 well in advance of hepatic spine, between 0.06 and 

 0.12 (mean 0.10) cl from orbital margin; and 2) 

 posterior tooth, as large as or larger, sometimes as 

 much as three times higher, than epigastric, 

 acutely pointed, strongly inclined anteriorly, and 

 placed considerably in advance of posterior mar- 

 gin of carapace, between 0.55 and 0.65 (mean 0.60) 

 cl from orbital margin (both teeth farther anterior 

 in large individuals than in young). Tuft of setae 

 present at anterior base of each tooth. Antennal 

 spine moderately long, sharp, buttressed; hepatic 

 spine long, conspicuously larger than antennal, 

 projecting from raised area, and situated between 

 0.19 and 0.24 (mean 0.22) cl from orbital margin. 



64 



12 18 



carapace length (mm) 



24 



30 



FIGURE 54.— Sicyonia disdorsalis. Relationship between ros- 

 trum length and carapace length (regression equation for speci- 

 mens with about 18 mm cl or less, y = -0.03933 + 0.30998x; 

 regression equation for those larger, > = 2.33498 + 0.14502x). 



Postocular sulcus deep anteriorly, continuing 

 posteriorly as very shallow arched groove; hepatic 

 sulcus subhorizontal; hepatic carina indistinct; 

 branchiocardiac carina weak. 



Antennular peduncle with stylocerite produced 

 in long, sharp spine, its length 0.75-0.85 distance 

 between lateral base of first antennular article and 







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