FISHERY BULLETIN: VOL. 83, NO. 8 



Genus Eualus Thallwitz 



In Stage I, rostrum absent to long; carapace 

 without supraorbital spine; tip of antennal scale 

 jointed; pereopods absent or, if present, undevelop- 

 ed; anal spine present. Exopodites first appear on 

 pereopods 1-3 or 1-4 in Stage III. Posterolateral 

 spines absent, on abdominal somites 4 and 5, or only 

 on abdominal somite 5. 



Eualus barbatus (Rathbun) 



Only Stage I described, known parentage; figure 3 

 in Ivanov (1971). 



Carapace without rostrum, supraorbital spine, or 

 denticles; pereopods absent; abdominal somites with- 

 out posterolateral spines or denticles but with 

 isolated hairs on dorsal surface of abdominal somites 

 3 and 4; abdominal somite 3 with indistinct row of 

 setae on dorsal surface. Length: 4.5 mm. Range: 

 Pribilof Islands, AK, to Hecata Bank, OR; depth, 

 82-507 m (Butler 1980). 



Eualus fabricii (KrOyer) 



Only Stages I and II described, known parentage; 



figure 5 in Haynes (1981). 

 Not "Spirontocaris larva Nr. 3, Spirontocaris 



fabricii!" as described by Stephensen (1916) (see 



Haynes 1981). 

 Not "SpirontocarisAarvaie No. 3? Spirontocaris 



fabricii (Kr0yer)" as described by Stephensen 



(1935) (see Haynes 1981). 



Not Spirontocaris fabricii as described by Frost 



(1936) (see Haynes 1981). 



Not "Eualus fabricii (Kr<)yer)" as described by 

 Pike and Williamson (1961) (see Haynes 1981). 



In all stages, posterolateral spines on abdominal 

 somites 4 and 5. In Stage I, antennal flagellum about 

 1.5 times length of antennal scale; minute spinules 

 along dorsoposterior margins of abdominal somites 4 

 and 5 (spinules absent in Stage II); supraorbital spine 

 absent (small in Stage II). In Stages I and II, pereo- 

 pods 1-3 with undeveloped exopodites. In Stage II, 

 exopodites of maxillipeds 1-3 with 4, 9, and 11 nata- 

 tory setae, respectively; telson not jointed with ab- 

 dominal somite 6. Length: Stages I and II, 3.5-4.3 

 mm. Range: Sea of Japan, Okhotsk Sea; Chukchi 

 Sea to British Columbia; in northwestern Alan tic, 

 from Foxe Basin and West Greenland to Massachu- 

 setts Bay (eastern United States); depth, 4-255 m 

 (Butler 1980). 



Eualus gaimardii (H. Milne Edwards) 



Six larval stages. 



Stages I-VI, known parentage; also Stages I and 

 11 from plankton; figure 2 in Pike and William- 

 son (1961). 



Last zoeal stage from plankton, described as 

 "Spirontocaris-larva No. 2A" by Stephensen 

 (1935), probably E. gaimardii forma gibba (see 

 Pike and Williamson 1961, p. 198). No figure. 



Stage V (?), described as "Spirontocaris B" by 

 Frost (1936), probably £". gaimardii {orma. gibba 

 (see Pike and Williamson 1961, p. 198); figure 4 

 in Frost (1936). 



Stage I, known parentage; described as Spironto- 

 caris gaimardii by Lebour (1940); figure 1 in 

 Lebour(1940). 



Stage I, known parentage; figures 21-23 in 

 Williamson (1957a: figures from Lebour 1940). 



In all described stages, rostrum long (about 1/3 

 carapace length); no subterminal seta on maxillule. 

 Rostrum without teeth until Stage V. In Stage V, 

 rostrum with 2 dorsal teeth; in Stage VI, rostrum 

 with 3 dorsal teeth. Supraorbital spine in Stages 

 II-V. Carapace with 3 or 4 denticles on anteroventral 

 margin in Stages I-IV. Antennal flagellum does not 

 extend beyond antennal scale until Stage V. Nata- 

 tory setae on exopodites of maxillipeds 1-3: 5, 7, 7 

 natatory setae, respectively, in Stage II; 5, 9, 9 in 

 Stage HI; and 5, 10, 10 in Stages IV and V. In 

 Stages I-V, posterolateral spine on abdominal somite 

 5. Length: Stages I-VI, 2.9-5.4 mm. Range: cir- 

 cumpolar, southward to North Sea; Cape Cod, MA; 

 Sitka, AK; Siberia; depth, 10-900 m (Holthuis 1947). 



Eualus herdtnaHt (Walker) 



Only Stage I described, known parentage; describ- 

 ed as "Spirontocaris herdmani" by Needier 

 (1934). No figure. 



Stage I, known parentage; Pike and Williamson 

 (1961: description from Needier 1934). No 

 figure. 



Carapace without rostrum or supraorbital spine 

 but with 3 anteroventral denticles; abdomen without 

 posterolateral spines; anal spine minute. No length 

 given. Range: Sitka, AK, to Puget Sound, WA; 

 depth, 18-232 m (Butler 1980). 



Eualus macilentus (KrOyer) 



Only Stage I described, known parentage; figure 2 

 in Ivanov (1971). 



276 



