38 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Genus Dinemoura Latreille, 1829 



Caligus Mliller, 1785, p. 132. [Refers to C. productus only.] 



Dinemoura Latreille, 1829, p. 197. [Type-species: D. produda.] 



Binoculus Nordman, 1832, p. 38. 



Dinematura Burmeister, 1833, p. 284. 



Pandarus. — Baird, 1850, p. 286. [Refers to P. lamnae only.] 



Nogagus. — Milne-Edwards, 1840, p. 460. [Refers to iV". gracilis only.] 



Female. — Frontal plate distinctly separate. Tlioracic segments 

 2-4 free. Dorsal tlioracic plates on segment 4. Genital segment 

 large. Abdomen 2-segmented and joined to genital segment ventrally. 

 Caudal rami broad. Oral area with or without adhesion pads. Adhe- 

 sion pad of first antenna double when present. Second maxilla with 

 a patch of long setides at base of terminal claw. Maxilliped with 

 small terminal claw. Legs 1-4 biramose. Rami of leg 1 2-segmented. 

 Rami of legs 2 and 3 3-segmented. Rami of leg 4 1-segmented and in 

 form of broad lamellae. Egg strings long and straight or folded. 



Male. — Body form of usual pandarid type. Dorsal plate of seg- 

 ment 4 reduced. Abdomen 2-segmented. Caudal rami large. Oral 

 area as in female. Legs 1-4 biramose. Legs as in female with the 

 following exceptions: terminal segment of endopod of leg 3 modified; 

 leg 4 rami 2-segmented; legs 5 and 6 present. 



DiscussioN.^ — -The genus Dinemoura occurs on the body surface of 

 large pelagic sharks. The genus is represented by 4 valid species. 



There has been much confusion in the Hterature over the generic 

 name of this group. In 1829 Latreille separated Caligus productus 

 Mliller from the genus Caligus and assigned it to a new genus, Dine- 

 moura. In 1832 Nordman used the name Binoculus but this was pre- 

 occupied by Geoffroy in 1792 for a phyllopod genus. Burmeister 

 changed the name Dinemoura to Dinematura in 1833 because the 

 etymology of the word Dinemoura was incorrect. Since then, the 

 2 names have appeared with almost equal frequency. Yamaguti 

 (1963) suggested that the original name be the proper one. Accord- 

 ing to Article 33a of the "International Code of Zoological Nomen- 

 clature," this viewpoint is correct. Burmeister's change was an 

 "unjustified emendation" and cannot stand. Not enough is known 

 of the males of the 4 species on which to base a key, but one is pro- 

 vided below for the females. 



Key to Females of Genus Dinemoura 



1. Adhesion pads conspicuous on oral area 2 



Adhesion pads absent or reduced on oral area 3 



2. Genital segment about K body length. Dorsal plates of segment 4 wider 



than long latifolia 



Genital segment about jz body length. Dorsal plates of segment 4 longer 

 than wide producta 



