FISHERY BULLETIN: VOL. 76, NO. 4 



Table 2. — Summary of zoeal features in the larval stages oi Galathea rostrata. 



numerals, setae by Arabic numerals, and fine 

 hairs by lower case Roman numerals. It should 

 also be remembered that previously movable setae 

 may, in a subsequent stage, become fixed spines 

 and the setal formulae will change accordingly. 

 Thus, a setal configuration proceeding medially of 

 a fixed spine (I), a thin hair ( ii ), a regular seta (3), a 

 previously movable seta now a fixed spine (IV), 

 followed by four movable setae (5-8) results in the 

 telsonal formula of I + ii + 3 + IV + 5-8. While 

 somewhat more ponderous than the previously 

 used formula of 8 -1-8, it does provide a clearer 

 picture of the type of processes and their changes 

 throughout subsequent larval development. 



Cervimunida (Fagetti I960) 



Rostrum elongate, needlelike, noticeably den- 

 ticulate; carapace posterolateral and posterior 

 margins dentate; posterior spines extremely elon- 

 gate, reaching fifth abdominal somite; antennal 

 scaphocerite elongate, aciculate, distinctly spined 

 along outer margin, and upper surface, basal seg- 

 ment with a single dorsal spine, unarmed ven- 

 trally (thus differing noticeably from other 

 galatheids where the situation is exactly the re- 

 verse); abdominal somites spined dorsally, so- 

 mites 4 and 5 with large lateral spines; telson 

 deeply bifurcate, furcae heavily armed; setal for- 



mula I -H ii + 3-7 (based on first stage zoeae). 

 Presumably four or five larval stages. 



Galathea (Sars 1889; Lebour 1930, 1931) 



Rostrum acute, often expanded at base, may be 

 armed distally; carapace posterolateral margin 

 usually spinulate or denticulate, posterior spine 

 rarely exceeding third abdominal somite; anten- 

 nal scaphocerite broad, flattened, basal segment 

 with single spine ventrally in stage I, two spines in 

 all other stages; posterodorsal margins of abdomi- 

 nal somites minutely denticulate, but may become 

 unarmed in later stages; distinct posterolateral 

 spines on somites 4, 5, or both but may be absent 

 later; no median dorsal spine on somite 6; telson 

 triangular, not deeply bifurcate in early stages, 

 becoming more elongate and truncately triangu- 

 lar in later stages; lateral spines may be denticu- 

 late; marginal setal formula in stages I and II of I 

 + ii -(- 3-7, 3-8, respectively, and in all later stages 

 I -I- ii -f 3 -I- IV + 5-8. Four or five larval stages, 

 pleopods present in last stage, as primordia in 

 penultimate stage on occasion. 



Munida (Sars 1889; 

 Lebour 1930, 1931; Rayner 1935) 



Rostrum elongate, needlelike, spinulate on dis- 



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