. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL STAGES OF MODIOLUS MODIOLUS 355 Hinge-line lengths ranged from 70 to SO /x. with the mean remaining constant over time. When larvae reached 140 to 150 /x in total length, the appearance of a rounded umbo marked the transition from the straight-hinge to the umbo stage of development. As larvae grew past 210 to 230 ^ in length, the umbo gradually extended from the hinge and shoulders as a low knob (Fig. 1). A linear regression of height on length, run on data from 550 M. cdnlis veligers in all stages of development, yie
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL STAGES OF MODIOLUS MODIOLUS 355 Hinge-line lengths ranged from 70 to SO /x. with the mean remaining constant over time. When larvae reached 140 to 150 /x in total length, the appearance of a rounded umbo marked the transition from the straight-hinge to the umbo stage of development. As larvae grew past 210 to 230 ^ in length, the umbo gradually extended from the hinge and shoulders as a low knob (Fig. 1). A linear regression of height on length, run on data from 550 M. cdnlis veligers in all stages of development, yielded the equation: height— length — (T- = ). Eighty-eight length versus depth measurements were used in a similar fashion to calculate the equation: depth -- length -- (T- -- ). The length-height and length-depth data were then combined to create a three- dimensional approximation of maximum and minimum larval sizes for the entire shelled veliger stage (Fig. 4). Eyespots were detected in larvae as small as 205 /x long, although the majority developed them when shell lengths reached 220 to 230 Larvae as large at 245 /„/, were occasionally observed to lack an eyespot. The eyespot diameter varied from 5 to 7 A well-defined foot could be seen in larvae 195 to 210 ^. in length, and active extension of this organ began in larvae between the lengths of 215 and 240 As with M. iiiodiolns. scanning electron micrographs of the exterior hinge A. B 05 mm. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laborato
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
