LAGOON PLANKTON 



211 



TABLE 1 (cont'd) 



Order SALPIDA (DESMOMYARIA) 

 Family SALPIDAE 



Salpa sp.: Gilmartin, 1958. 

 Thalia democratica (Forsskal); Gilmartin, 1958. 

 Class APPENDICULARIA (COPELATA: LARVACEA) 

 Family FRITILLARIDAE 



■fFritillaha megachile Fol: Gerber, 1981. 

 Fritillaria sp.: Gerber, 1981. 

 Family OIKOPLEURIDAE 



Oikopleura intermedia Lohmann: Gerber, 1981. 

 fOikopleura fusiformis Fol: Gerber, 1981. 

 fOi/cop/eura longicaudata (Vogt): Gerber, 1981. 

 f Oikopleura parua Lohmann: Gerber, 1981. 

 fOifcop/eura rufescens Fol: Gerber, 1981. 



t These were identified in the ocean waters neighboring Bikini Atoll (Chiba et al., 1955). 



Lagoon and the channel adjacent to Japtan Islet resulted in 

 an additional 26 species (Gold and Morales, 1977), thus a 

 total of 34 tintinnids is known from this area. Identifica- 

 tion and nomenclature for the tintinnids are based on 

 Campbell and Moore (1954), Corliss (1977), and Kofoid 

 and Campbell (1939). 



For discussion of other Ciliophora and Foraminifera, 

 sec Chapter 4, this volume. 



CNIDARIA 



Hydrozoa 



Siphonophora 



Calycophorid siphonophores collected in net samples 

 form a small fraction of the zooplankton in this area and 

 have been most extensively sampled by Sears (1950) dur- 

 ing the spring and summer of 1946. Two species were 

 found within Enewetak Lagoon and eight outside, with 

 only one common to both areas. At nearby Bikini, 

 Rongelap, and Rongerik Atolls, 27 additional species were 

 recorded with about one-third of those recorded in the 

 lagoons. These appear to be largely oceanic species but 

 include Abx^la leukartii. A. trigona, Cheloph\;es app€r\dicu- 

 lata, Dip/iyes arctica. D. bojani, Enr)eagonum hi^alinuar. 

 Eudoxides spiralis, Galetta australis, G. chuni, G. bigelouui, 

 Lensia campartella. L. cossack, L. foiuleri. L. grimaldii. 

 L. hotspur, L. multicristata. Rosacea plicata, Sulculeolaria 

 mor)oica, and S. quadridentata. Additional records of 

 siphonophores identified from Enewetak Lagoon were 

 made by Alvarino (personal communication) from samples 

 collected in 1946 and by Gerber (1981) from 35 samples 

 collected during the winters of 1972, 1974, and the sum- 

 mer of 1974. In this last study, eight species were 

 recorded from the Enewetak Lagoon (which includes the 

 three species previously recorded); most species increased 

 in abundance during the summer. Only one physophorid 

 siphonophore, the Portuguese man-of-war, Phi;salia, has 

 been collected and identified from Enewetak Lagoon where 



occasionally it appears commonly, sometimes washing up 

 on lagoon islet beaches. 



Siphonophores were also recorded at Enewetak 

 Lagoon by Johannes and Gerber (1974) during the sum- 

 mer of 1972 and at Majuro Atoll Lagoon by Hobson and 

 Chess (1973), but no species were identified. Taxonomy 

 and identification of siphonophores can be found in Sears 

 (1950) and Totton and Bargmann (1965). 



Hydroida 



Various Anthomedusae have been reported from net 

 tows made in the lagoon by Gilmartin (1958) and Gerber 

 (1981) but not identified. At least one species of 

 Anthomedusae has been identified to genus (C. Arneson) 

 but is unavailable. Representatives of this group commonly 

 occur in the lagoon plankton and are usually damaged 

 beyond recognition in net collections. Two species of chon- 

 drophorans have been identified from the lagoon and are 

 in the Mid-Pacific Marine Laboratory (MPML) reference 

 collection. 



SCYPHOZOA 

 Semaeostomae 



Two species have been collected from Enewetak 

 Lagoon and have been identified and placed in the MPML 

 reference collection. 



Rhizostomae 



One species of this group, preserved in the MPML 

 reference collection, has been identified from the lagoon. It 

 was collected by Trench and Colley in August 1978 off 

 Bokoluo Island (Alice) and in the lagoon in October 1980 

 by C. Arneson. 



Two key works on the identification and taxonomy of 

 the medusae (Hydroida and Scyphozoa) are Kramp (1961) 

 and Mayer (1910). 



