KORONACANTHA-PECTINARIA N-COMB (ACANTHOCEPHALA, ILLIOSENTIDAE) FROM MICROLEPIDOTUS-BREVIPINNIS (HAEMULIDAE) AND REDESCRIPTION OF TEGORHYNCHUS-BREVIS

Tegorhynchus pectinarius Van Cleave, 1940, is redescribed on the basis of male and female specimens in Microlepidotus brevipinnis from the m arine waters of Costa Rica and Mexico. The elongate proboscis with a h eavy cuticular coating, cuticular body spines, 8 cement glands, and th e heavy, strongly recurved hooks in the shape of an inverted apostroph e with roots that are simple but exaggerated in size with a small hook blade indicate that T. pectinarius should be assigned to Koronacantha Monks and Perez-Ponce de Leon, 1996. Koronacantha pectinaria n. comb. can be distinguished from Koronacantha mexicana in having strongly re curved hooks only on the dorsal side of the proboscis, a conspicuous p atch devoid of normally developed hooks located just anterior to the r ecurved hooks, trunk spines extending from the anterior end of the tru nk posteriorly over 85% of the trunk, lacking genital spines in both s exes, and by the basal comblike group of small close-set hooks made up of 5 to 7 hooks. In K. mexicana, the recurved hooks occur as a comple te ring, no patchlike area devoid of hooks exists, trunk spines begin at posterior end of receptacle and extend posteriorly over rest of tru nk, genital spines are present in both sexes, and the basal comblike g roup of small close-set hooks consists of 4 or 5 hooks. Tegorhynchus b revis Van Cleave, 1921, is redescribed based on the original specimens , and Tegorhynchus, Koronacantha, and Illiosentis are considered diagn ostically distinct.