MARLNEI GAMMARIDEAN AMPHIPODA 



19 



Table 4. — Dominant benthic genera of Gammaridea in littoral epifaunal faunule 

 of southern California (+ — yes; 0=no.) 







Kind of domination 





^rnrnHpT* c\^ 







Genus 



species 



Specific 



Frequency of 







Diversity 



Individuals 



*Ampithoe 



11 



+ 



+ 



*Aoroides 



1 







+ 



Elasmopus 



5 



+ 



+ 



*Ericthonius 



1 







+ 



*Eurystheus 



4 



+ 



+ 



Hyale 



3 







+ 



*Ischyrocerus 



2 







+ 



*Jassa 



2 







+ 



Maera 



5 



+ 







*Microdeutopus 



1 







+ 



Parapleustes 



4 



+ 



+ 



*Photis 



6 



+ 



+ 



*Fonning tubes; others are nestlers. 



been described. Of course there are numerous kinds of scavenger 

 feeding. An intertidal faunule of low latitudes in lush algae will be 

 comprised of extremely abundant nestlers such as Hyale, Elasmopus, 

 Maera; protected rock surfaces, interstices and root systems of algae 

 or surf-grass will contain the domicolous amphipods building tubes, 

 sach as Ampithoe, Ericthonius, Gammaropsis, Jassa, Ischyrocerus, and 

 Photis. Sessile invertebrates like sponges and tunicates will harbor 

 nestlers and domicUary kinds as well as a few inquilines, such as 

 Leucothoe and Polycheria. 



The sublittoral faunule on soft bottoms will be comprised of bur- 

 rowers such as Paraphoxus (and other phoxocephalids), haustoriids, 

 oedicerotids ; domiciliary kinds building limp tubes on the sediment 

 surface, primarily the Ampeliscidae; various domicilary kinds build- 

 ing tubes on hard particles of the substrate or on projecting tubes 

 of inf aunal organisms, thus the Isaeidae (Photidae) ; and a few nestlers 

 or semicommensal organisms like Listriella. 



Intertidal zones of high latitudes will have nestlers like Pontogeneia, 

 Paramoera. 



The dominant genera of Gammaridea on sublittoral soft bottoms 

 by gross region are as follows (*= genera with low specific diversity 

 but high individual frequency) : 



Cosmopolitan: Ampelisca, [Gammaropsis], IduneJla, Listriella, Lysianassa, 



Metaphoxus, Paraphoxus, Podocerus, Synchelidium, Urothoe. 

 Bipolar, cold-water: Aristias, Byblis, Epimeria, Eusirus, Liljeborgia, Mel- 



phidippa, Orchomene, Podoceropsis, Tryphosella {"Tryphosa, Tmetonyx"). 



