. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL DEVELOPMENT OK PALHYCHELES 133 at Sebastian Inlet, on April 12 and 13, 1972, respectively. Both inhabited the inter- stices of phragmatopomid worm reefs common in the areas. Each female occurred with a male. Prior to this report Pachycheles monilifer was known only as far north as Hillsboro Reef, in south Florida (Haig, 1956, page 14). The females were returned to the Harbor Branch Foundation Laboratory, Ft. Pierce, Florida (HBFL) placed in 19 cm diameter glass bowls filled with non-flowing seawater (34%0) until hatch
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL DEVELOPMENT OK PALHYCHELES 133 at Sebastian Inlet, on April 12 and 13, 1972, respectively. Both inhabited the inter- stices of phragmatopomid worm reefs common in the areas. Each female occurred with a male. Prior to this report Pachycheles monilifer was known only as far north as Hillsboro Reef, in south Florida (Haig, 1956, page 14). The females were returned to the Harbor Branch Foundation Laboratory, Ft. Pierce, Florida (HBFL) placed in 19 cm diameter glass bowls filled with non-flowing seawater (34%0) until hatching occurred on 13 April. A series of 48 zoeae were placed, one each, in individual compartments of 24-compartmented rearing trays. No controlled temperature units were used. Instead, all stages were exposed to ambient light, and were held at room temperature which was adjusted via central reverse-cycle air conditioning to maintain a water temperature of about 28° C (±2 C°, mean = ° C). Water was changed and Artemia nauplii were provided as food every day. Salinity of ocean water stored in a 13- gallon container and used throughout the study was 34%c. Measurements of zoeae and megalopae were made with a Wild slide micrometer and are expressed as the arithmetic average of the specimens examined. For further details involving rearing, measuring and describing of larvae consult previous studies by Gore (, 1970, 1972a). A spent female and a complete series of larval stages are deposited in the Na- tional Museum of Natural History, USNM 141323, 141324; a second series will be deposited in the British Museum of Natural History. RESULTS Rearing experiment Pachycheles monilifer hatches as a pre-zoea, remaining thus for as little as five minutes or up to one hour before molting to the first zoeal stage. This stage is not described. At temperatures of ° C the first zoeal stage lasts four to six days, but usually five days before molting to stage II. At temperatures
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
