HAYNES: PANDALIDAK, HIPPOLYTIDAE, ANDCRANCONIDAE LARVAE 



crangon larl, young stage" by Stephensen 

 (1916); figure 3 in Stephensen (1916). 



In Stage I, antennal scale with distal spine on 

 outer margin; endopodite of maxillule and scaphog- 

 nathite of maxilla with 6 setae each; abdominal 

 somites 3-5 fringed dorsally with small spinules 

 (spinules not mentioned for Atlantic specimens); 

 telson and abdominal somite 6 jointed; telson with 8 

 + 8 setae. In megalopa, short, pointed rostrum ex- 

 tends to middle of eye; carapace with 2 dorsal teeth, 

 ventral edge fringed with short plumose setae; ab- 

 dominal somite 5 without posterolateral spines. 

 Length: Stages I-III, 8.0-12.0 mm. Range: Sea of 

 Japan to Anadyr Gulf, Gulf of Georgia, and San Juan 

 Islands, WA; arctic Canada to Nova Scotia, Canada; 

 depth, intertidal to 2,090 m (Butler 1980). 



Argis la I (Owen) 



Probably 3 larval stages. 



Stages I and II, from plankton; described cisNecto- 



crangon lar by Makarov (1967); figure 22 in 



Makarov (1967). 

 Not Crangonidae "Species F" (described by Kurata 



1964b). as assumed by Makarov (1967). i" 



In Stage I, telson and abdominal somite 6 not 

 jointed; telson with 7 -i- 7 setae. In Stage II, telson 

 with 8-1-8 setae. Abdominal somites without 

 spinules. Length: Stages I and II, 6.2-7.5 mm. 

 Range: Sea of Japan to Chukchi Sea to Strait 

 of Georgia, WA; depth, 10-280 m (Butler 

 1980). 



Genus Crangon Fabricius 

 (= Crago Lamarck) 



Five or six zoeal stages. Anteroventral margin of 

 carapace denticulate in most if not all larval stages. 

 In all described stages, rostrum about 1/3 carapace 

 length, spiniform, without teeth; posterolateral 

 spines on abdominal somite 5; exopodites develop 

 on either pereopod 1 or pereopods 1 and 2; ab- 

 dominal somite 3 usually with dorsal spine; telson 

 always widens posteriorly, with setae and < 8 + 8 

 spines. 



Crangon alaskensis Lockington 



Five larval stages. 



Stages I-VII (Stage VI, first juvenile), known 

 parentage; illustrations 1-79 in Loveland (1968). 



In all described stages, rostrum barely reaches 

 beyond eyes; dorsal spine on abdominal somite 3. 

 Length: Stages I-V, 2.0-3.3 mm. Range: Kuril 

 Islands; Bering Sea to Puget Sound, WA; depth, 

 intertidal to 275 m (Butler 1980). 



Crangon communis Rathbun" 



Only Stage I described, known parentage; de- 

 scribed as Sclerocrangon communis by Ivanov 

 (1968); figure 1 in Ivanov (1968). 



Not Stages I I-V C. communis from plankton; de- 

 scribed by Makarov (1967) as Sclerocrangon 

 communis.^^ 



Antennal flagellum about 3/4 length of antennal 

 scale; antennal scale with 14 setae; abdominal 

 somites without keels; spinules on posterior margins 

 of abdominal somites 3-5. Length: Stage I, 4.8 mm. 

 Range: Sea of Japan to Chukchi Sea to San Diego, 

 CA; depth, 16-1,537 m (Butler 1980). 



Crangon da Hi Rathbun 



Five larval stages. 



Stage I, known parentage; Stages II-V and VI 

 (first juvenile, "postlarval"), from plankton; 

 figure 18 in Makarov (1967). Larvae figured in 

 part but not described. Larvae thought to be 

 identical morphologically to C. allmani larvae 

 from the Atlantic Ocean (Makarov 1967). 



Stage I from plankton; figures 7-9 in Birshteyn 

 (1938). 



Not "last (?) stage" as described by Birshteyn 

 (1938) (see Makarov 1967). 



Typical unabbreviated crangonid development. In 

 all described stages, carapace without dorsal, lateral, 

 or supraorbital spines; anterior margin of carapace 

 denticulate; rostrum spiniform, without teeth; 



'"Morphological differences are too great for Makarov'.s Necto- 

 rrnngon lar larvae and Kurata's "Species F" larvae to be identical. 

 Makarov's larvae lack exopodites on pereopods in all stages and, in 

 Stages I and II, have posterolateral spines on abdominal somite 5. 

 Kurata's "Species F" larvae, known only in Stage II, have an exo- 

 podite on pereopod 1 and posterolateral spines on abdominal 

 somites 5 and 6. 



•'Zarenkov (1965) proposed placing C. commuvis in a new 

 subgenus, Neocrangov. Butler (1980) has shown that Zarenkov's 

 diagnosis for Neon-angon is invalid, at least for British Columbia 

 species. Based on Butler's findings, I have retained C. mmmuni.^ in 

 the genus CraJigcn). 



12 It is unlikely that Makarov's (1967) larvae and Ivanov's (1968) 

 larvae are the same species because Makarov's larvae have keels on 

 abdominal somites 2 and 3, whereas Ivanov's larvae do not. 



281 



