. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DEVELOPMENT OF A SQUID LIGHT ORGAN 297 tivity, and females maintained in the laboratory typically lay clutches of 50 to 200 eggs on pieces of dead coral or on the walls of their tanks (Singley, 1983). Females of E. scolopes may lay several clutches of eggs at intervals of several days to a few weeks, unlike many cephalopod spe- cies in which the female dies soon after a single repro- ductive effort. Embryonic development of E. scolopes is temperature dependent, and juveniles typically hatch 21- 22 days after eggs are laved w
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DEVELOPMENT OF A SQUID LIGHT ORGAN 297 tivity, and females maintained in the laboratory typically lay clutches of 50 to 200 eggs on pieces of dead coral or on the walls of their tanks (Singley, 1983). Females of E. scolopes may lay several clutches of eggs at intervals of several days to a few weeks, unlike many cephalopod spe- cies in which the female dies soon after a single repro- ductive effort. Embryonic development of E. scolopes is temperature dependent, and juveniles typically hatch 21- 22 days after eggs are laved when maintained at 23°C (Wei and Young, 1989; pers. obs.) and within 20 days at 24°C (Arnold el al, 1972). The light organ of a newly hatched Euprymna sco/opes does not contain bacterial symbionts but becomes infected within hours post-hatch by symbiotic bacteria present in seawater that is pumped through the mantle cavity in the normal ventilatory process (Wei and Young, 1989; McFall-Ngai and Ruby, 1991). Symbionts enter the in- cipient light organ through several pores and, within 24 hours post-infection, populate cavities lined by epithelial cells (McFall-Ngai and Ruby, 1991). During initiation and establishment of the symbiotic association, the light organ undergoes a series of morphogenetic events that results in a fully differentiated structure in which the bacterial symbionts are presumably maintained under steady state conditions (McFall-Ngai and Ruby, 1991; Ruby and McFall-Ngai, 1992). Previous work indicates that the light organ of juveniles remains in a state of arrested morpho- genesis until it is exposed to, and inoculated with, a com- petent strain of symbiotic bacteria (McFall-Ngai and Ruby, 1991; Montgomery and McFall-Ngai, 1991). Although the general embryonic development of Eu- prymna scolopes has been described (Arnold el al., 1972), development of the light organ has remained undescribed. Light organ development in E. scolopes appears similar to that descri
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
