106 



S. OHTSUKA, G.A. BOXSHALL AND H.S.J. ROE 



Table 1 Sampling date, locality, depth and gear used for arietellid collection. 



Species 



Sex 



Number of 

 specimens 



Date 



Locality 



Depth (m) 



Gear 



Remarks 



Crassarietellus huysi [ 



9 



1 



18 IV 1977 



20°18.5'N,21°41.2'W 

 20°20.8'N, 21°53.0'W 



3974-4036 



RMT8 



5-20 m off 

 bottom 





9 



2 



18 IV 1977 



20°19.7'N,21 o 51.3'W 

 20°18.4'N, 21°40.5'W 



4008-4060 



RMT8 



5-20 m off 

 bottom 



Crassarietellus sp. 2 



cf 



1 



24 VI 1908 



38°02'N, 10°44'W 



0-4800 



Richard net 





Campaneria latipes 3 



cf 



1 



4 X 1968 



37°07'S, 177°14'E 



1234-1260 



Modified Menzies 

 trawl 



Some small 

 stones 



Paraugaptiloides magnus 4 



cf 



1 



11 X 1968 



34°38'S, 174°36'E 



1697 



Modified Menzies 

 trawl 





Arietellus aculeatus 



9 



1 



23 II 1979 



15°00'-15 o 05'N 

 158°00'-158 o 0r\V 



400 



IKMWT 







cf 



2 



23 II 1979 



15°10'-31°14'S 



7r56'-71°58'W 



400 



IKMWT 





Arieiellus mohrr 



9 



1 



24 VI 1962 



31°10'-31°14'S 



71°56'-71°58"W 



1932-3142 



Phlenger corer 





Arietellus pavoninus h 



9 



1 



28 XI 1965 



28°05'N, 14°06'W 



600-720 



N113H 





Arietellus plumifer 



9 



1 



28 VI 1985 



31°20'N,25°17'W 

 31°18'N,25°27'W 



600-840 



RMT1 







? 6 



1 



26 XI 1965 



28°07'N, 14°07'W 



680-800 



N113H 







cf 6 



1 



13 XI 1965 



28°04'N, 14°12'W 



360-410 



N113H 





Arietellus setosus' 1 



cf 



1 



29 XI 1965 



28°05'N, 14°10'W 



50-85 



N113H 





Arietellus simplex''' 



cf 



1 



28 XI 1965 



28°05'N, 14°06'W 



750-900 



N113H 





Arietellus sp. 6 



9 



1 



11 XI 1965 



28°04'N, 14°11"W 



460-510 



N113H 





Metacalanus sp. 1 



9 



4 



23 V 1989 



26°17.9'N, 126°54.2'E 



167 



Sledge-net 







cf 



1 



23 V 1989 



26°17.9'N, 126°54.2'E 



167 



Sledge-net 





Metacalanus sp. 2 



9 



4 



23 V 1989 



26°17.9'N, 126°54.2'E 



167 



Sledge-net 





Paramisophria giselae 7 



9 



2 



3 IX 1970 



23°19'S,41°57'W 



100 



Plankton net adapted 

 to dredge 





Paramisophria japonica* 



9 



1 



23 V 1989 



26°17.9'N, 126°54.2'E 



167 



Sledge-net 





Paramisophria reductd' 



cf 



1 



25 II 1984 



Jameos del Agua 



10-28 



Plankton net 





Paraugaptilus buchanfi 



9 



1 



16X1 1969 



17°41'N,25°18'W 



410-500 



RMT1 







9 



1 



15 XI 1965 



27°48'N, 13°55'W 



450-510 



N113H 







cf 



1 



24 XI 1965 



28°06'N, 14°08'W 



775-830 



N113H 





Paraugaptilus similis 



9 



1 



21 I 1978 



04°02'S, 150WW 



275 



IKMWT 







cf 



1 



21 I 1978 



04°02'S, 150°00'W 



275 



IKMWT 





Pilarella longicornis 10 



9 



1 



22 VI 1970 



28°36'S, 47°55'W 



135 



Plankton net adapted 

 to dredge 





Scutogerulus pelophilus 7. 



9 



1 



10 X 1968 



34°56'S. 175°23'E 



1383-1397 



Modified Menzies 

 trawl 



Globigerina 

 Ooze 



Sarsarietellus abyssalis 2 



9 



1 



4-5 VIII 1897 



38°37'N.28°14'W 



1260 



'Nasse' 





Sampling data after: ' Boxshall & Roc (1980); - Sars (1925); 3 Bradford (1%9); 

 Ohtsuka ct al. (1991); 9 Ohtsuka et al. (1993a); "' Alvarez (1985). 



Bradford (1974); 5 Bjornberg ( 1975); 6 Curric ct al. ( 1969); 7 Campancr (1977) 



(Campaner, 1977; Bowman & Abele, 1982). 



Arietellids are widely distributed from neritic to oceanic 

 waters and range vertically from the epipelagic zone to the 

 bathypelagic hyperbenthic layer (Campaner, 1984). 

 Recently, cave-living species of Metacalanus and Parami- 

 sophria have been discovered (Ohtsuka et al., 1993a). How- 

 ever, neither phylogenetic nor ecological studies on the 

 family have been carried out in detail, partly because of the 

 paucity of pelagic arietellids in the water column, and partly 

 because of the lack of intense sampling effort in the hyper- 

 benthic layers where many species are found. 



Campaner (1984) first examined the relationships between 

 arietellid genera. He divided them into two morphologically and 

 ecologically different groups. The first group comprised Arietel- 

 lus, Paraugaptilus and Scutogerulus, which are characterized by a 

 reduced female leg 5 and complex male leg 5, and are distributed 

 in the bathypelagic or deep-sea hyperbenthic zones. The second 

 group consisted of Metacalanus, Paramisophria, Rhapidophorus 

 and Sarsarietellus and was diagnosed by characters such as the 

 relatively well developed leg 5 in the female (except for Metacala- 



nus) and the simplified second exopod segments and reduction of 

 endopod of leg 5 in the male. These are highly adapted 

 hyperbenthic forms found in relatively shallow waters (<1000 m 

 deep) or in epipelagic waters in neritic regions. However, 

 Campaner's (1984) classification relied solely on the structure of 

 the fifth legs although he recognized interspecific variation 

 between congeners in leg characters. 



The present paper describes a new arietellid genus col- 

 lected from the deep-sea hyperbenthic community in the 

 northeastern Atlantic, and establishes two new genera to 

 accommodate previously known arietellids, the male of Scu- 

 togerulus pelophilus Bradford, 1969 and the male of 

 Paraugaptilus magnus Bradford, 1974. Revised diagnoses of 

 all known arietellid genera, except for Rhapidophorus, are 

 given here together with supplementary descriptions. Charac- 

 ter transformations of the genital systems and appendages of 

 these arietellids are considered in detail. A cladistic analysis 

 is employed to help clarify phylogenetic relationships 

 between the arietellid genera. 



