FISHERY BULLETIN: VOL. 88. NO. 3 



posterolateral spines on abdominal somite 5; abdo- 

 minal somites without spinules or keels; telson 

 always widens posteriorly, never with > 1 pair of 

 lateral spines. In Stage V, pleopods uniramous, with 

 buds of endopodites. Length: Stages I-V, 2.8-7.0 

 mm. Range: Sea of Japan to Chukchi Sea, to Puget 

 Sound. WA; depth, 3-630 m (Butler 1980). 



Crangon franciscorum angustiwana Rathbun 



Only Stage I described, known parentage; figure 1 

 in Haynes (1980b). 



Rostrum extends beyond eyes; carapace without 

 shallow transverse groove; antennal scale with 10 

 plumose setae including subterminal seta along outer 

 margin; endopodite with 4 segments on maxilliped 1, 

 and 5 segments on maxilliped 3; exopodites of maxil- 

 lipeds not jointed; pereopods 1-4 present but un- 

 developed; buds of exopodites on perepods 1 and 2; 

 median dorsal spine on abdominal somite 3; postero- 

 lateral spines on abdominal somite 5; fifth pair of 

 telsonic spines about equal in length to fourth and 

 fifth pairs. Length: Stage I, 2.8-3.3 mm. Range: 

 Kachemak Bay, AK, to Tillamook Rock, OR; depth, 

 18-183 m (Butler 1980). 



Crangon septemspinosa Say 



Described from specimens from both Atlantic and 



Pacific Oceans. 

 Five or six larval stages. 

 Stages I and II, known parentage; Stages III-VI, 



from plankton; described as C. affinis by Kurata 



(1964b); Pacific specimens; figures 1-29 in 



Kurata (1964b). 

 Stage I, known parentage; Stages II-V, from 



plankton; Atlantic specimens; described as 



Crago septemspinosufi Say by Needier (1941); 



figures 1 and 2 in Needier (1941). 

 Stages I-X (Stage X, first juvenile stage), known 



parentage (larval series likely includes extra 



stages); Atlantic specimens; figures 1-51 in 



Tesmer and Broad (1964). 

 Stages I-V, from plankton; Pacific specimens; 



figure 20 in Makarov (1967). 



Discrepancies among descriptions may result, at 

 least in part, from geographical variations in mor- 

 phology. The following synopsis is based on speci- 

 mens from off Hokkaido, Japan (Kurata 1964b). In 

 all described stages, shallow transverse groove in 

 carapace; dorsal spine on abdominal somite 3, 

 posterolateral spines on abdominal somite 5. Exo- 



podite only on pereopod 1. In Stage I, antennal scale 

 with 11 setae, including 2 subterminal setae along 

 outer margin; endopodites of maxillipeds 1-3 with 4 

 segments; exopodites of maxillipeds jointed; fifth 

 pair of telsonic spines distinctly shorter than fourth 

 or sixth pairs. Length: Stages I-V, 1.9-5.0 mm. 

 Range: Prince Edward Island, Canada (Needier 

 1941); Beaufort, NC (Tesmer and Broad 1964); 

 an estuarine, subarctic boreal species, Sea of 

 Okhotsk (Makarov 1967); Hokkaido, Japan (Kurata 

 1964b); depth, 0-90 m, rarely to 440 m (Holthuis 

 1980). 



Genus Mesocrangon Zarenkov 



Largest larvae of Crangonidae with unabbreviated 

 development. From Stage III on, posterior margin of 

 telson straight or slightly concave. 



Mesocrangon intermedia (Stimpson) 



Five larval stages. 



Stages I-V, from plankton; described as Sclero- 



crangon intermedia by Makarov (1967); figure 



24 in Makarov (1967). 



In Stage I, antennal flagellum about half as long as 

 antennal scale; antennal scale with 11 setae; abdo- 

 minal somites 2-3 with keels; abdomen apparently 

 without spinules. Length: Stages I-V, 4.5-9.0 mm. 

 Range: Sea of Okhotsk to St. Lawrence Island (Ber- 

 ing Sea); depth, 18-180 m (Makarov 1967). 



Genus Paracrangon Dana 



In all described stages, rostrum long, spiniform, 

 spinulose, directed upwards about 45°; carapace 

 with denticulate anteroventral margin; basipodite of 

 maxilliped without subterminal seta; exopodites on 

 pereopods 1 and 2; exopodites of pereopods 1 and 2 

 with ^ 6 natatory setae; protopodite of antenna with 

 2 spines- one at base of flagellum, other a long spine 

 at base of scale. 



Paracrangon echinata*^ Dana 



At least 7 larval stages. 



"A diagnostic character of adult Paracrangon is the absence of 

 pereopods 2 (Rathbun 1904). Kurata's (19fi4b) description of Pnni- 

 rrangon erhiriala shows pereopixi 2 fully (levelof)ed as late tLs the 

 seventh larval stage. Either Makarov's(19t>7) identification of these 

 larvae as P. fchmata is incorrect, or P. echimitu must have at least '.i 

 or 4 more larval stages before pereopod 2 becomes reduced or 

 absent. 



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