PIETSCH: OSTEOLOGY AND RELATIONSHIPS OF TETRABRACHIUM 







""4 



B 





'im^ 





Figure 39. — Anterior views showing illicial cavity within which the iliiciai hone, when fully retracted, comes to lie: A. Chaunax 

 coloratus Garman; B. Dihranchus spinosa (Garman); C. Halieutupsis tunufrons (Garman). After Garman (1899). 



expansion is pierced by a large, circular foramen 

 within which fits the bifurcated proximal end of 

 the respective dorsal fin spine. The anteriormost 

 pterygiophore of Lophichthys (Figure 37A, B) is 

 unique among the antennarioids examined in 

 being much more elongate, and in becoming 

 greatly depressed and laterally expanded poste- 

 riorly. In Chaunax and Dibranchus (Figure 38), 

 the pterygiophores of the dorsal fin spines are 

 cylindrical in cross section along their entire 

 length. 



Dorsal and anal fin ray counts of the anten- 

 narioids examined are compared in Table 2. 



Pectoral and pelvic girdles and fins (Figures 14, 

 40). — The posttemporal ofAntennarius, Lophich- 

 thys, Brachionichthys , and Chaunax is similar to 

 that of Tetrabrachium , attached to the cranium in 

 such a way that considerable movement in an 

 anterodorsal-posteroventral plane is possible. In 

 contrast, the posttemporal oi Dibranchus is fused 

 to the cranium. 



The number and length of the pectoral fin 

 radials varies somewhat among the antennarioids 

 examined. There are three relatively short pec- 

 toral radials in Tetrabrachium , and Antennarius 

 (Figures 14, 40A). The three radials of Lophich- 

 thys (Figure 40B) are exceptionally long and 

 narrow; the second radial is reduced, tapering 

 proximally to a slender filament. Brachionichthys 

 (Figure 40C) has two, somewhat elongate pectoral 



Figure 40. — Pectoral radials. lateral view, left side: A. Anten- 

 narius striatus^VW 20768, 67 mm SL; B. Lophichthys boschmai, 

 UW 20773, 47 mm SL; C. Brachionichthys hirsutus, AMS 

 IA.6064, 69 mm SL; D. Chaunax pictus. UW 20770. 90 mm SL: E. 

 Dibranchus atlanticus, MCZ 51257, 105 mm SL. 



411 



