. Bulletin of the Natural History Museum (Zoology). ERENNA REVISION 171. Fig. 1 Erenna richardi. Image from in situ video of JSL II Dive 1456 specimen; approximately 70-80 cm in length. states of development, and several nectophoral buds, remained with the JSL II 1456 specimen. They were flattened, and measured up to 32 mm in length, 33 mm in width and 10 mm in height. The large axial wings tapered toward their apices (Fig. 2 A aw). Mature nectophore had relatively large thrust block (Fig. 2C tb) with a broad U-shaped indentation apically. On its ventral surface there were two small conical pr
. Bulletin of the Natural History Museum (Zoology). ERENNA REVISION 171. Fig. 1 Erenna richardi. Image from in situ video of JSL II Dive 1456 specimen; approximately 70-80 cm in length. states of development, and several nectophoral buds, remained with the JSL II 1456 specimen. They were flattened, and measured up to 32 mm in length, 33 mm in width and 10 mm in height. The large axial wings tapered toward their apices (Fig. 2 A aw). Mature nectophore had relatively large thrust block (Fig. 2C tb) with a broad U-shaped indentation apically. On its ventral surface there were two small conical protuberances (Fig. 2C cp). However, on the younger nectophores, the thrust block was small and had no protuberances (Fig. 3). The prominent main ridge system consisted of pairs of apico- (Fig. 2A ral) and infra-laterals (Fig. 2B ril), which united close to the apex of each axial wing; and a pair of vertical laterals (Fig. 2B rvl) that connected the apico-laterals with the infra-laterals; al- though in some nectophores the junction with the latter was weak and difficult to discern. Apico-laterals branched close to the ostium, with each branch reaching the latter. In addition to these ridges at least two pairs of incomplete lateral ridges passed obliquely down the lateral facet in the basal half of the nectophore. Often these were difficult to discern without staining, but were also described by Margulis (1977), who noted 2-3 pairs of them. Ostial opening basal with no obvious mouth plate. On each side of the ostium there were prominent lateral protuberances on which lay strips of distinctive epidermal cells. A much smaller triangular patch also was present dorsally. In addition, there was a small patch of such cells on each side of the nectophore, at about the mid-height of, and basal to, the vertical lateral ridges. All these patches of epider- mal cells are believed to be sites of bioluminescence. T-shaped nectosac (Fig. 2B n) with a distinct muscle-free area across the whole o
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