. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EGG BROODING BY DEEP-SEA OCTOPUSES 97. Figure 2. Still from a videotape of a female of Bemhoctofius brooding eggs inside a rock overhang. Alrin dive 2974, August 13. 1995. Note the double rows of arm suckers, the dark ventral web surface, and the much brighter dorsal mantle surface. The oral surface of the animal is positioned away from the egg mass and the tear-shaped eggs are suspended from the roof of the rock crevice. ture probes inserted into the sediment recorded temperatures as high as °C, but the water temperature
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EGG BROODING BY DEEP-SEA OCTOPUSES 97. Figure 2. Still from a videotape of a female of Bemhoctofius brooding eggs inside a rock overhang. Alrin dive 2974, August 13. 1995. Note the double rows of arm suckers, the dark ventral web surface, and the much brighter dorsal mantle surface. The oral surface of the animal is positioned away from the egg mass and the tear-shaped eggs are suspended from the roof of the rock crevice. ture probes inserted into the sediment recorded temperatures as high as °C, but the water temperature just above the sediments was °C, only slightly elevated over ambient (G. J. Massoth, pers. comm.). Brooding individuals of Benthoctopus were seen much less often than were those of Graneledone. Most members of Benthoctopus were observed partially hidden under ledges or in narrow crevices (Fig. 2). on one occasion within 5 in of a congener. Once in both 1995 and 1997. females of both genera brooded eggs in opposite ends of the same cleft in the rock face at Baby Bare. The sequence in which the females moved into the cleft could not be estimated because females of Benthoc- topus were so deep in the recess of the rock that the develop- mental stage of their eggs could not be determined for com- parison to those of Graneledone. Their proximity (within an arm's length) allowed the animals to be compared in size: females of Benthoctopus seen brooding at these depths of from 2400 to 2600 in were generally one-half to one-third the size of those of Graneledone. This differences in size and in how females were positioned—those of Benthoctopus were most often under rock overhangs or inside crevices while those of Graneledone were most often positioned against rocks—are likely to have strongly biased the observations toward mem- bers of Graneledone (, 16 of 20 observations of octopuses in which the genus could be identified in 1995). Videotapes show that in both genera the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
