. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 58 FLOY E. MACMILLAN Two species of Pachycheles, P. pubescens Holmes and P. rudis, are found on the California coast north of San Francisco. The adults are distinguished on the basis of the shape of the carpus and carapace, by the hairiness of the chela, and by the number of telson plates on the female (Haig, 1960). Both species have been collected in rocky intertidal regions from British Columbia to Baja California. As noted above, Knight (1966) cultured and described the zoeae of P. rudis. The present paper presents a desc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 58 FLOY E. MACMILLAN Two species of Pachycheles, P. pubescens Holmes and P. rudis, are found on the California coast north of San Francisco. The adults are distinguished on the basis of the shape of the carpus and carapace, by the hairiness of the chela, and by the number of telson plates on the female (Haig, 1960). Both species have been collected in rocky intertidal regions from British Columbia to Baja California. As noted above, Knight (1966) cultured and described the zoeae of P. rudis. The present paper presents a description of the larval development of P. pubescens. Because of the similarity of the two species, P. rudis was cultured along with P. pubescens. Pachycheles rudis zoeae were found to be identical to Knight's (1966) description. A subsequent paper will contain larval descriptions of the genus Petrolisthes, which is the only other genus of Porcellanidae on the northern California coast, and it should then be possible to identify Porcellanidae zoeae collected from this area to the species level. 100 „. FIGURE 1. The per cent survival of Pachycheles pubescens Holmes plotted at two day intervals for the duration of its pelagic life. One hundred per cent represents 68 zoea in series A, 20 zoea in series B. MATERIALS AND METHODS The larvae of P. pubescens were found to be almost identical to those of P. rudis at hatching and it was necessary to culture series of zoea of both species simultaneously. To further substantiate the results, series of zoea were cultured from two females of each species. Three ovigerous females of Pachycheles pubescens and two of Pachycheles rudis were collected during tides on the north jetty, Doran Park, Sonoma County, California, in October, January and February, 1970-1971. The adults were maintained separately in plastic aquaria on sea water tables until the zoea hatched. Zoeae were transferred to 62 mm stender dishes containing approximately 25 cc
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
