(footnote 5) found the peak reproductive period for P. affinis in the 

 New York Bight to be during spring and fall, with some recruitment 

 almost all year. In our study of the apex, there were approximately 

 1.5 times more P. affinis in the Bight during summer months than 

 during the winter in terms of higher densities at the same stations. 



Phylum Arthropoda 



Class Crustacea 



depths ranging from about 9 to 46 m. It occurred in all sediment 

 types but was most common in low organic fine to medium sands 

 (Fig. 57; Table 1). 



FEEDING ECOLOGY: Pearse et al. (1942) considered E. tri- 

 loba a scavenger. Sanders (1956) classified it as a selective deposit 

 feeder, and Myers (1977) called it an epistratal feeder. 



G. Schultz (1969) reported finding E. triloba as a prey item in the 

 stomachs of cod. 



Order Isopoda 



Edotea triloba (Say, 1818) 



DESCRIPTION: The genus and species Edotea triloba has been 

 revised to include the species montosa (Stimpson) and acuta 

 (Richardson). It is a small, dorso-ventrally flattened, oval-shaped, 

 muddy-colored isopod crustacean, which grows to about 10 mm in 

 length (Miner 1950: G. Schultz 1969). 



DISTRIBUTION: Miner (1950) reported that this species is dis- 

 tributed from Nova Scotia to New Jersey. 



HABITAT: Smith (1964) reported that E. triloba is found on 

 muddy shores, usually with dirt adhering to the carapace. Miner 

 (1950) reported it from mud and fine sand from the surface to 46 m. 

 In the New York Bight apex, E. triloba was widely distributed in 



REPRODUCTION AND GROWTH: Sexes in isopods are sepa- 

 rate. Eggs are brooded by the female in the marsupium. As in 

 cumaceans and tanaidaceans, the hatching stage is a postlarva 

 (manca stage), having the last pair of legs incompletely developed. 

 The young usually do not remain with the female after they leave 

 the marsupium (Barnes 1974). 



Order Amphipoda 



Ampelisca verrilli Mills, 1967 



DESCRIPTION: A small amphipod. males grow to 10.5 mm in 

 length, females to 13.5 mm. Body compressed, smooth, two pairs 

 of eyes. Ampelisca verrilli is a domiciliary form which constructs a 

 shallow, thin-walled tube in sand. The tubes are open only at the 

 upper end, the inner walls solidified by glandular secretions from 

 the peraeopods (Bousfield 1973). 



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Figure 57.— Distribution and abundance of Edotea triloba in (he New York Figure 58.— Distribution and abundance of Ampelisca verrilli in the New York 



Bight apex. Bight apex. 



39 



