. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. hb. Figure 1. DIG photomicrograph of sea anemone tentacle. The epi- dermis (e). containing cnidocyte/supporting-cell complexes (CSCCs) and sensory-cell/supporting-cell complexes (SNSCs), is separated from the gastrodermis (g) !-, the mesoglea (m). Cnidae within cnidocytes (c) of CSCCs are visible within the epidermis. Hair bundles (hb) at the apices matocysts, spirocysts, and basitrich nematocysts were counted on the test probes within a rectangular reticule measuring 38,880 /urn2. The mean number of nematocysts and other cn
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. hb. Figure 1. DIG photomicrograph of sea anemone tentacle. The epi- dermis (e). containing cnidocyte/supporting-cell complexes (CSCCs) and sensory-cell/supporting-cell complexes (SNSCs), is separated from the gastrodermis (g) !-, the mesoglea (m). Cnidae within cnidocytes (c) of CSCCs are visible within the epidermis. Hair bundles (hb) at the apices matocysts, spirocysts, and basitrich nematocysts were counted on the test probes within a rectangular reticule measuring 38,880 /urn2. The mean number of nematocysts and other cnidae counted was divided by the mean num- ber of BFCs to give a ratio. This value was multiplied by to correct for the difference between the areas of the tentacle sampled for discharge and imaged for fluo fluorescence. Results Morphology and organization of cells Sea anemone tentacles are composed of two tissue layers separated by a mostly acellular matrix called the mesoglea (Fig. 1). The epidermal layer lies adjacent to the external surface and the gastrodermal layer lines the internal cavity (the coelenteron). Within the epidermis, supporting cells form complexes either with cnidocytes or with sensory cells (CSCC = cni- docyte/supporting-cell complex: SNSC = sensory-cell/ supporting-cell complex). In each of the complexes, a sin- gle cnidocyte or a single sensory cell is surrounded by several supporting cells. These supporting cells contribute small-diameter ( ^m) stereocilia to a hair bundle that protrudes from the apical surface of the complex (Pe- teya, 1975). In the CSCC, the cnidocyte contributes a sin- gle kinocilium to the hair bundle (Mariscal el at., 1978). In the SNSC, the sensory cell contributes a single kino- cilium and 5-10 large-diameter ( /urn) stereocilia to the hair bundle (Peteya. 1975). In CSCCs. cnidocytes are easily recognized by the pres- ence of cnidae (microbasic p-mastigophores. basitrichs, or spirocysts); however, because cnid
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
