NO- 3586 CYCLOPOID COPEPODS — HUMES AND HO 9 



have a mandible somewhat resembHng that of the new species. 

 L. actinoi)horus Humes and Frost, 1964, has an ehjngated posteriorly 

 directed process on the inner side of the basal region, but this process 

 is more pointed and dentiform than in L. rhadinus. In addition, 

 L. adinophorus differs from L. rhadinus in lacking a basal expansion 

 on leg 5 in the female. Four species show on the inner basal region 

 of the mandible a dentiform process much shorter than in L. rhadinus. 

 These are L. decorus Humes and Frost, 1964 (in which the last seg- 

 ment of the exopod of leg 4 is 111,1,4), IL. {Epimolgus) protulae 

 Stock, 1959 (with no basal expansion on leg 5 in the female and 

 with the last segment of the second antenna bearing three strong 

 claws, three setiform claws, and one seta), and L. organicus Humes 

 and Ho, 1967, and L. conjunctus Humes and Ho, 1967, from the 

 alcyonarian coral Tubipora musica. In both of these there is no basal 

 expansion on leg 5 in the female and the last segment of the second 

 antenna bears two claws and five setae. All other species of Licho- 

 molgus in which the mandible has been described or figured lack 

 prominent processes of this sort. 



Eight species of Lichomolgus can not be compared with L. rhadinus 

 in respect to the mandible since that appendage in them is unknown. 

 They may be easily separated from the new species, however, on 

 other grounds. L. denfipes Thompson and A. Scott, 1903, and L. 

 rifjidus (Ummerkutty, 1962) have the formula 111,1,5 on the last 

 segment of the exopod of leg 4. L. elegans Thompson and A. Scott, 

 1903, has in the female a much shorter caudal ramus and leg 5 with- 

 out a basal expansion. L. gigas Thompson and A. Scott, 1903, is 

 much larger (female 2 mm) and leg 5 lacks a basal expansion. L. 

 longipes (Sewell, 1949), L. rotundus Sewell, 1949, L. tenuicornis 

 Brady, 1910, and L. vagans Gurney, 1927, have two claws included 

 in the armature of the last segment of the second antenna. 



L. rhadinus appears to be most closely related to L. actinopliorus 

 Humes and Frost, 1964. It is of interest to note here the strong 

 similarity between the mandible of L. rhadinus and that of Bhyn- 

 chomolgus corallophilus (compare figs. 33 and 90). In many other 

 features, however, these two copepods from Psammocora are very 

 different. 



Genus Monotnolgus Humes and Frost, 1964 

 Monomolgus psatnmocorae, new species 



Figures 52-79 



Type material.— 17 99, 27 cf cf^, and 2 copepodids washed from 

 the coral Psammocora contigua (Esper) in a depth of 2 m, southeast 

 of Ambariobe, near Nosy Be, Madagascar. Collected Sept. 8, 1963. 

 Holotype female, allotype, and 32 paratypes (12 99, 20 d^ cf ) deposited 



228-964—67 2 



