A new deep-sea eelpout, Hadropogonichthys leptopus, representing the second species in the genus, is described on the basis of 25 specimens from the Pacific Ocean off central and northern Honshu, Japan, at depths ranging from 1115 to 1948m. This species differs from H. lindbergi Fedorov, 1982 from the Fourth Kuril Strait, Russia, in having simple or bifid cirri in single rows on the mandibular canal and ventral branch of the suborbital canal, short and slender pelvic fins, three postorbital pores, 14-16 pectoral fin rays, and two nub-like pyloric caeca.
A new aploactinid fish, Cocotropus roseomaculatus sp. nov., is described from a single specimen collected in coastal waters of Kwazulu-Natal, South Africa, western Indian Ocean. The new species differs from its congeners in having the following combination of characters: 12 dorsal fin spines, 13 pectoral fin rays, 26 vertebrae in total, four dorsal spines anterior to the third neural spine, no papillae on the posterior portion of the maxilla, the first pair of sensory pores of the lower jaw contralaterally fused, the isthmus tip almost reaching to the fifth sensory pore of the lower jaw, no vomerine teeth, the upper jaw longer than the lachrymal, five preopercular spines, lower jaw pappillae weakly developed, and pinkish spots on body and fins.
Three species of the dipterous family Diadocidiidae and one species of the Borboropsidae are recorded from Japan (Honshu). Palaeodocidia ishizakii gen. and sp. nov. of the former family and Borboropsis yakunoana sp. nov. of the latter are described and their male genitalia are illustrated. The genus Palaeodocidia differs from Diadocidia in the numbers of flagellomeres and abdominal tergites, and in peculiar structures of the male genitalia. Diadocidia spinosula Tollet, 1948, known from Europe, is recorded for the first time from Honshu, Japan.
A new species of the harpactorine assassin bug genus Parendochus, P. gracilis, is described from Vietnam as the second member of the genus. Parendochus leptocorisoides (China, 1940) is recorded from Thailand for the first time, with a supplementary description.
Twelve late-stage phyllosoma larvae of Chelarctus cultrifer (Ortmann, 1897) were collected in the offshore area northeast of Yonaguni Island on 23 November 1998, transported to the laboratory, and reared individually in circular acrylic chambers on a diet of fresh clam meat. Two final-stage phyllosomas metamorphosed into the nisto stage after 14 and 30 days, and these nistos then molted to the juvenile stage after 10 and 11 days, respectively. The morphology of the late-stage phyllosomas collected off Yonaguni Island, other phyllosomas from the Northwestern Pacific, and the nisto and juvenile stage exuvia of the reared larvae are described and illustrated in detail.
Pycnogonids of the species Ammothea hilgendorfi (Bohm, 1879) were found attached to sea-stars, Coscinasterias acutispina (Stimpson, 1882), from the intertidal zone of Hayama, Sagami Bay, Japan. The sea-stars were collected throughout the year, but the pycnogonids were found only between March and August, mostly in April. The pycnogonids attached to the body surface of the sea-stars mainly by clinging to spines of the aboral and lateral sides of the arms. Developmental stages of the pycnogonids attached to the sea-stars comprised the four final juvenile stages as well as adults, but earlier juvenile stages were not found.
The genus Acarothrix was to date known from southern China, northern Australia, and southeastern Africa. In this paper a new species is described, collected in the Little Manatee River, Tampa Bay, Florida, U.S.A. Males, but not females, of this genus have external genital acetabula.
Typosyllis pallida (Verrill, 1875) is frequently encountered in the intertidal and shallow subtidal of the Gulf of Maine. Size, number of setigers, and morphology and size of the compound setae blades distinguish it from other members of the genus occurring along the coast of New England.