GORE: LARVAL DEVELOPMENT OF GALATHEA ROSTRATA 



tolateral margins and tips in early stages, but may 

 be unarmed in later stages; a serrated posterolat- 

 eral carapace margin with noticeable posterior 

 spine, latter often extending to about fourth ab- 

 dominal somite; antennal scaphocerite elongate, 

 thin or even noticeably aciculate, often spined; 

 basal segment with a single ventral spine in first 

 stage, 2 in later stages; abdominal somites 2-5 

 with two or more spines or spinules dorsally, mar- 

 gin of somite 6 with a single larger median spine 

 from stage III onward; telson originally deeply 

 bifurcate in early stages of development, but be- 

 coming more triangularly truncate later, thus ap- 

 pearing similar to that in Galathea in later stages; 

 telson furcae often spined; telson setal formula I + 

 ii + 3-7, 3-7 or -8 in stages I and II and I + ii + 3 + 

 IV + 5-9, 5-10, 5-11 or -12 in stages III-V, respec- 

 tively. Four of five larval stages, pleopods present 

 in last stage. 



Munidopsis (Sars 1889; Samuelsen 1972) 



Rostrum broad, flattened, nearly spatulate in 

 all zoeal stages, profusely armed about outer mar- 

 gins; carapace with a large, forward-directed spine 

 on anterolateral margin; entire ventral and pos- 

 terolateral margins noticeably spinulate, posterior 

 margin rounded, lacking elongate posterior spine 

 otherwise typical of larvae in the family; antennal 

 scaphocerite a flattened blade, two spines ven- 

 trally; posterodorsal margins of abdominal so- 

 mites unarmed, a posterolateral spine present on 

 somite 5; telson broadly spatulate, posterior mar- 

 ginal setal formula 1 + 2 -l-iii + IV -I- 5-15 in stage 

 I, and I + 2 -t- iii -h IV + 5-15 in stages II and III; 

 other smaller hairs interspersed among setae 

 5-15. Three larval stages, pleopods present in 

 each. 



Pleuroncodes (Boyd I960; 

 Fagetti and Campodonico 1971) 



Rostrum flattened basally, expanded similarly 

 to that oi Galathea, distal portion acute, margins 

 noticeably spinulate, especially at tip; posterolat- 

 eral carapace margins serrated, elongate posterior 

 spines usually extending to fourth abdominal so- 

 mite; antennal scaphocerite narrow, not as acicu- 

 late as in some Munida , basal segment with either 

 1 or 2 ventral spines; abdominal somites 1-5 heav- 

 ily spined dorsally on posterior margins, becoming 

 somewhat reduced in spination in later stages; 

 somite 6 with a median dorsal spine in stage III 



and later; telson deeply bifurcate in stages I and II, 

 becoming more truncately triangular in later 

 stages as in Munida and Galathea; furcae may be 

 denticulate; marginal setal formula I -I- ii + 3-7, 

 3-8 in stages I and II, and I + ii + 3 + IV + 5-9, 5-10, 

 and 5-12 in stages III-V, respectively. Five larval 

 stages, including up to eight substages in stage IV; 

 stage VI in laboratory culture; pleopods present in 

 stage V. The genus is presently restricted to the 

 eastern Pacific Ocean. 



ACKNOWLEDGMENTS 



I thank my laboratory assistants Kim A. Wilson 

 and Nina Blum for their aid in field collections and 

 in laboratory culture of the larvae. Robert M. 

 Avent and the Coral Biology Section of the Harbor 

 Branch Science Foundation Laboratory obtained 

 the ovigerous females which provided the larvae 

 used in this study. Susan Bass and Karen Rodman 

 recorded data and helped in the laboratory during 

 their tenure on Harbor Branch Foundation and 

 Smithsonian Institution Fellowships. 



LITERATURE CITED 



Al-Kholy. a. a. 



1 959. Larval stages of three anomuran Crustacea (from the 

 Red Sea). Publ. Mar. Biol. Stn., Al Ghardaqa 10:84-89. 



Boyd, C. M. 



1960. The larval stages ofPleuroncodesplanipes Stimpson 

 (Crustacea, Decapoda, Galatheidae). Biol. Bull. (Woods 

 Hole) 118:17-30. 



Boyd. C. M., and M. w. Johnson. 



1963. Variations in the larval stages of a decapod crusta- 

 cean, Pleuroncodes planipes Stimpson (Galatheidae). 

 Biol. Bull. (Woods Hole) 124:141-152. 

 CHACE, F. a., Jr. 



1942. Reports on the scientific results of the Atlantis ex- 

 peditions to the West Indies, under the joint auspices of 

 the University of Havana and Harvard University. The 

 Anomuran Crustacea. I. Galatheidea. Torreia (Havana) 

 11, 106 p. 

 Fage, L., and Th. MONOD. 



1936. Biospeologica. LXin. La faunne marine due jameo de 

 agua. Lac. souterrain de I'lle de Lanzarote (Canaries). 

 Arch. Zool. Exp. Gen. 78:97-113. 

 Fagetti, E. 



I960. Huevos y el primer estadio larval del langostino 

 (Cervimunida johni Porter 1903). Rev. Chil. Hist. Nat. 

 55:33-42. 



Fagetti, E., and L Campodonico. 



1971. Larval development of the red crab Pleuroncodes 

 monodon (Decapoda Anomura: Galatheidae) under 

 laboratory conditions. Mar. Biol. (Berl.) 8:70-81. 



Gore, R. H. 



1968. The larval development of the commensal crab 

 Polyonyx gibbesi Haig, 1956. (Crustacea: Decapo- 

 da). Biol. Bull. (Woods Hole) 135:111-129. 



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