NO- 3570 PANDARIDAE — CRESSEY 33 



mented. Claw of maxilliped spatulate. Legs 1-4 biramose, rami of 

 legs 1-3 2-segmented, those of leg 4 1-segmented. Egg sacs long 

 and straight. 



Male. — Unlcnown. 



Remarks.— This copepod was described by Shiino in 1960 from a 

 single ovigerous female taken off a hammerhead shark (Sphyrna 

 zygaenae) by him. He assigned this new species to the genus Gang- 

 liopus. After a redescription of the generic diagnosis of this genus, 

 it became apparent that this new copepod did not belong to that 

 genus. Suice I have had no material of this species to work with, 

 no further diagnosis of Shiino's species can be made. I have removed 

 this species from the genus Ganglioims for the foUowmg reasons: 

 (1) Shimo's species show well-developed adhesion pads associated with 

 the first and second antennae; (2) the dorsal thoracic plates of the 

 second segment are well formed in Pannosus; (3) the maxilliped of 

 japonicus has a spatulate tip whereas in Gangliopus the tip is pointed. 

 Shiino does not mention the presence of fifth legs but more material 

 would probably reveal their nature. 



Since this copepod does not conform to any known genus, I propose 

 placing it in a new genus Pannosus. 



The name Pannosus, from Latin, meaning "covered with rags," refers 

 to the appearance of the dorsal plates. 



Genus Perissopus Steenstrup and Liitken, 1861 



Perissopus Steenstrup and Lutken, 1861, p. 393. [Type-species: P. dentatus.] 

 Chlamys Beneden, 1892a, p. 227. 

 Achtheinus Wilson, 1908, p. 450. 



Female.— Frontal plate not distinctly separate. First thoracic 

 segment fused with cephalon. Thoracic segments 2-4 free and 

 possessing dorsal plates. Dorsal plate of segment 2 extending to 

 posterior border of plates of segment 3. Plates of segment 4 coveHng 

 anterior portion of genital segment. Abdomen 1-segmented and 

 attached ventrally to genital segment. Caudal rami rudimentary. 

 Fu-st antenna 2-segmented. Second antenna armed with teeth at tip. 

 Mouth parts of typical pandarid type. Adhesion pads present. 

 Maxdhped with small claw and large adhesion pad. Legs 1-4 biramose 

 but much reduced. Rami of legs 1 and 2 2-segmented. Rami of legs 

 3 and 4 1-segmented. All legs without plumose setae. Legs 5 and 6 

 present. Egg strings long and straight. 



Male.— Frontal plate separate. No dorsal plates present. Oral 

 area similar to female but with adhesion pads reduced. Maxilliped 

 with a strong terminal claw. Legs 1^ biramose with each ramus 

 2-segmented. All setae plumose. Fifth and sixth legs present. Leg 3 



221-534—67 3 



