340 CRUSTACEA 



Key lo llio snl)<»nl(M-s of Copcpoda: 

 a, Tin* fciiiMic niri'ics c;;;; siics 1. 10u(M)PKr()l)A 



ttj No OKK «1H'H PIVSlMlt 2. l?HAN(nHlIHA 



Si)iu)KM>Kii 1. KUCOPEPODA. 

 Body olon.i;nlo; niouili parts l)i(iii<; in llic Tree and siickliii;- in most 

 of llio ])arnsi(i<', I'onns: 15 rainilics. 



Koy l,() llic lamilics of Fjucopcpoda Iumc described: 

 Ox FnM'-svvimiiiiiiK foniis (with a few except ions). 

 />, First antennnc* 17 lo 2r>-joinle(I, beini; v«My Ion;;, usmilly as Ion;:: as tlie 

 body ; but 1 (\i;>; sac. 



C, First nnteiiua«' prehensile in niMl(> ; animals ninrine 1. ('ai.ATSIIOAK 



<?, lli^lit first anltMina prehiMisile; marine and fresh wnler animnls. 



(/, First pair of h>^s normal ; hut 1 eye present 2. ('KNTUoeAoiDAK 



<ii First i»;iir of letis weak or rndiment:n-y ; :'. eyes nsmilly present. 



;'». ToiN ri'LLIOAK 



hi First antennae not more than l7-jointed; nsnaily ^ e^ri; sacs. 

 c, Abdomen markedly narrower than thorax; 2 e^;; sacs; mostly fresh- 



wnler animals I. ('yimoimdaf: 



r'a AhdomcMi not marktMlly nnnower ili.in (hor.ix 5. II AurACTlClDAR 



«, l*jn'asiti<' forms, but which may nsmilly be fnM'-swimmin.i; nt times. 

 />, Si'^nuMitation <listinet. 

 <•, IJody with the iis'.ml nimilxM- of se.i;nu>nls ; iirst antenna(> 5 to 7-.iointe<I. 



c» J i- • T *• i I • 1 <>. lOlUJASII.lDAE 



Ca tSe.i:mentation indistinct and irreirular. 



(/i lV)dy wide and Hat 7. Caltoidae 



(/a liody elonuate S. DiciiKi.i.sTiinAio 



?>2 Seiijnn'ntation wanting ov indistinct in tlu> e.i^.u-bearin^ feiimle. 



r, Le.us rudimentnry ; i)ro|)oseis i>resent ; body worm-like 1). Lkkn.kidae 



Cn Le^rs rudimentary or wantini; ; no proboscis pres«'nt : body worm- 

 like 10. Ciioniucacvntiiidai; 



('3 lit'gs wantin.i;; proboscis ju-esent ; body thick and sac-like. 



11. lilOUIN/EOrODlDAE 



Family 1. CALANTDAF.* 



l>(>(ly oloii^ale; lirsl, anIcMiiiai* very ioni;', willi 



23 to 'Jf) joints, in the inaio but sliu'iilly inodilied; 



second antennae larue and biraniose; lirsl 4 pairs 



of leu's biianiose, onter branch .'{-joinled; lil'lli i)air 



f{ X\ ' / V eithei- like llie preeodini;' or modilied and unlike 



6 



on llie Iwo sides; heart [)rosenl ; Ji sini;le oui;- sac 



presenl : 2(1 ^cneia, and over 100 species, all marine. 

 marl^u^u^ ^\^\^Ia^^\, ^ Calanus Loacli. Tliorax composed of 



H.^msnr'poVtil)!) oi'"mlii cither I or 5 seunienis, tlic last one bcin^' some- 

 pa r o o«s. liin(>s asymnielrical ; lirsl aniennae 2;') jointed in 

 the remale: many si>ccies, 

 C. finmarchicus ((Jnnneins). r.iit (Fi.u*. ^iWl). Len^lh about 4 nun.; 

 color yellowisli or reddish, but somelimos absent; thorax of 5 seenients; 

 fifth pair of le.es biraniose; first antennae as lon.u as the body: New Enj::- 



• See "Copcpoda." by W. CJlesbreetit and O. Sebiuell, Das Tiorreii-li. ISOS. 



