FISHERY BULLETIN: VOL. 75, NO. 2 



FIGURE 27 .—Haliporoides diomedeae, 6 34.5 mm cl, off Bahi'a Pichidangui, Coquimbo, Chile. A, Petasma, dorsal view (partly bent 

 laterally). B, Ventral view of left half. C, Right appendices masculina and interna, dorsal view. D, Ventromesial view. 



Appendix masculina (Figure 27C, D) short, 

 length about 1.5 times maximum width, pro- 

 duced laterally into broad semicircular lobe, ven- 

 trally excavated and bearing patch of long setae 

 along entire distal margin. Appendix interna 

 falling short of distal margin of appendix mas- 

 culina, and armed with thickly set setae along 

 entire distal margin; distolateral spur very short 

 and obtuse. 



Thelycum ( Figure 28 ) with no ridge or protuber- 

 ance on sternite XIV, latter smoothly convex or 

 low subconical, often bearing minute central 

 tubercle; posterior part of sternite XIII armed 

 with strong median, acute to blunt subconical 

 protuberance directed anteriorly and studded 

 with numerous setae on anterior half; posterior 

 margin of sternite XII lacking horns. 



Co/or.-Overall pink with red and orange patches 

 and bands, both longitudinal and transverse. For 

 detailed account of coloration see Illanes B. and 

 Zuhiga C. (1972). 



Maximum size-Males: 50 mm cl; females: 57 mm 

 cl (in material examined by me). 



Geographic and bathymetric ranges.-Off Penin- 

 sula de Azuero, Panama (Figure 20) to Talca- 

 huano, Chile (36°40'S), in depths between 240 



294 



(Illanes B. and Zuhiga C. 1972) and 1,866 m (Fig- 

 ure 9). Information on the geographic and bathy- 

 metric distributions of this species, as well as of its 

 other two congeners in the American Pacific, is 

 extremely meager. 



Affinities. -Haliporoides diomedeae is the only 

 member of the genus occurring in American 

 waters and may thus be readily distinguished 

 from the other solenocerids in the region by 

 generic characters. Its two congeners, the Indo- 

 West Pacific H. sibogae and H. triarthrus, differ 

 from it in possessing an arcuate, ventrally toothed 

 rostrum, and in lacking meral spines on the first 

 pair of pereopods, as well as in petasmal and thely- 

 cal features. In both of them, the ventromedian 

 lobule of the petasma is neither expanded distally 

 nor serrate along its terminal margin, and the 

 thelycum exhibits a midridge on sternite XIII 

 instead of a subconical, median protuberance. 



Remarks-Studies of this species are extremely 

 few, and almost entirely restricted to its external 

 morphology. The most recent contribution is one 

 by Illanes B. and Zuhiga C. (1972), who presented 

 many fine observations on numerous features. 

 Previously, Arana Espina and Cristi V. (1971) 

 had determined the relations between the follow- 

 ing parameters: carapace length, total length, 



