IIAYNKS: DESCRIPTION OF C.OLDKN KING CRAB LARVAE 



III in L. antarctica. The peduncle of the 

 antennuleand endopodite of the third maxilliped 

 of Stage II L. maja are segmented, butareunseg- 

 mented in Stage II L. aequispina and L. 

 antarctica. 



Among genera of the family Lithodidae, 

 larvae of L. aequispina are most similar morpho- 

 logically to larvae of the genus Paralithodes. 

 Zoeae of L. aequispina can be readily distin- 

 guished from Paralithodes zoeae (Sato 1958) by 

 the number of telsonic setae and by the setation 

 of the antennal flagellum. In L. aequispina 

 zoeae, the telson has 1 1 pairs of setae in all stages, 

 and the antennal flagellum is setose beginning in 

 Stage III; whereas, in Paralithodes zoeae, the 

 telson has nine or fewer pairs of setae, and the 

 antennal flagellum is naked. In the glaucothoe, 

 the carapace spines of L. aequispina are 

 markedly larger and more spinous than in the 

 glaucothoe of Paralithodes. 



Formerly, zoeae of the family Lithodidae were 

 considered similar morphologically to those of 

 the subfamily Pagurinae (family Paguridae), 

 because zoeae of Lithodidae differ only in the 

 reduction or disappearance of the uropods 

 (Gurney 1942; MacDonald et al. 1957). Zoeal 

 development of L. aequispina and L. antarctica 

 varies somewhat from the pattern of develop- 

 ment of the other known larvae of the family 

 Lithodidae, as summarized by Gurney and 

 MacDonald et al. Zoeae of the Pagurinae have 

 the following characterstics: the antennal 

 flagellum has fewer than three setae in all 

 stages; the telson has six pairs of setae in Stage I 

 and seven pairs in Stages II-IV; and the exo- 

 podites of the maxillipeds have 7, 7, 6 setae in 

 Stage II, 7 or 8 setae in Stage III, and 8 setae in 

 Stage IV. Zoeae of L. aequispina have an 



antennal flagellum that is setose beginning in 

 Stage III; the telson has 11 pairs of setae in all 

 stages; and the exopodites of the maxillipeds have 

 9, 9, and 8 setae in Stage II and 9, 9, and 9 setae in 

 Stages III and IV. Zoeae of L. antarctica differ 

 from zoeae of the Pagurinae by having in all 

 zoeal stages nine pairs of telsonic setae and eight 

 setae on each exopodite of the maxillipeds. The 

 glaucothoe of the Paguridae and Lithodidae are 

 similar to the adults and, thus, readily distin- 

 guished from each other. 



LITERATURE CITED 



Campodonico, I. 



1971. Desarrollo larval de la centolla Lithodes antarctica 

 Jacquinot en condiciones de laboratorio. (Crustacea 

 Decapoda, Anomura: Lithodidae). An. Inst. Patagonia 

 2(1-2):181-190. 

 Gurney, R. 



1942. Larvae of decapod Crustacea. Ray Soc. (Lond.) 

 Publ., 306 p. 

 Haynes, E. 



1973. Descriptions of prezoeae and Stage I zoeae of 

 Chionoecetes bairdi and C. opilio (Oxyrhyncha, 

 Oregoniinae). Fish. Bull.. U.S. 71:769-775. 

 1976. Description of zoeae of coonstripe shrimp, 

 Pandalus hypsinotus, reared in the laboratory. Fish. 

 Bull.. U.S. 74:323-342. 

 MacDonald, J. D.. R. B. Pike, and D. I. Williamson. 



1957. Larvae of the British species of Diogenes, Pagurus, 

 Anapagurus and Lithodes (Crustacea, Decapoda). 

 Proc. Zool. Soc, Lond. 128:209-257. 



Sars, G. 0. 



1890. Bidrag til Kundskaben om Decapodernes 

 Forvandlinger. II: Lithodes- Eupagurus- Spiropagurus 

 - Galathodes - Galathea - Munida - Porcellana - 

 (Nephrops). Arch. Math. Naturv. 13:133-201. 



Sato, S. 



1958. Studies on larval development and fishery biology 

 of king crab, Paralithodes camtschatica (Tilesius). [In 

 Jpn., Engl, summ.] Bull. Hokkaido Reg. Fish. Res. 

 Lab. 17:1-102. 



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