NO. 3574 COPEPOD CRUSTACEANS — LEWIS 15 



Discussion. — Anchistrotis moa is most closely related to A. ostra- 

 cionis (Richiardi, 1870). The overhanging tergal regions of the 

 cephalothorax and prosomal pedigerous segments of A. moa, the 

 absence of the small basal projection found on the postantennal 

 process of A. ostracionis, and the nature of the spination on the 

 ventral surface of the third abdominal segment are the most readily 

 distinguished characteristics which separate the two species. The 

 species name is derived from "Moa," one of the Hawaiian names for 

 Ostracion lentiginosus, the host of this copepod. 



Order Caligoida 



Family Diclielestliiidae 

 Hatschekia Poche, 1902 



Diagnosis of female. — Cephalothorax consisting of cephalon 

 and first thoracic segment; distinct although incompletely separated 

 from second thoracic segment. At least second and third thoracic 

 segments pedigerous, segments either distinct or fused. Fourth 

 and fifth thoracic segments fused with genital segment. Abdomen, 

 if distinct, short, 1-segmented; frequently fused with genital segment; 

 caudal rami minute. Antennule 3- to 7-segmented, antenna 2- or 

 3-segmented, terminal segment with claw. Mandible rodlike, den- 

 ticulated distally. One pair of maxillae apparently lacking ; maxillules 

 or maxillae (probably maxillules) 2-parted or biramous (depending on 

 degree of reduction), each part (if rudimentary) or ramus (if well 

 developed) typically with 2 setae or spines. Maxilliped slender, 

 terminal process typically bifurcate. First 2 thoracic leg pairs 

 buamous, rami 1- or 2-segmented; third and fourth thoracic leg 

 pau's rudimentary or absent; fifth pair absent. 



Diagnosis of male.- — Cephalothorax distinct from second thoracic 

 segment, postcephalothoracic segments incompletely or completely 

 fused. Abdomen, if distinct from genital segment, 1-segmented; 

 caudal rami larger than in female, armed with spines or stiff setae. 

 Appendages similar to those of female. 



Hatschekia breviramus, new species 



Figures 6, 7 



Material. — Thirteen adult females from the external surface of 

 Mulloidichthys auriflamma Forskal collected at Kauai, Hawaii. One 



Figure 5. — Anchislrotos moa, new species, female, ventral view: a, oral region, right side 

 showing labrum (lab), mandible (mdbl), maxillule (ma-1), maxilla, and paragnath (pg); 

 b, antennule base (a-1) and postantennal process; c, projecting portion of maxilla; d, max- 

 illiped. Thoracic legs, anterior view: e, right first;/, left second; g, left third; h, right 

 fourth. 



