Discovery reports (1941) Discovery reports discoveryreports20inst Year: 1941 LARVAE OF SERGESTES 55 of somites 4 and 5 small and simple. Dorsal spines nearly equal, the third a little the largest. Telson parallel-sided, sharply constricted and with a simple fork at end. A pair of small lateral spines may or may not be present. Eye large and asymmetrical, nearly one-fifth length of body, the eyeball two-thirds length of eye. The pigment is dark, usually with a small lighter-coloured area at one end. Labrum with large spine. Antennal scale very long and slender; flagellum nearly Fig. 46. S.
Discovery reports (1941) Discovery reports discoveryreports20inst Year: 1941 LARVAE OF SERGESTES 55 of somites 4 and 5 small and simple. Dorsal spines nearly equal, the third a little the largest. Telson parallel-sided, sharply constricted and with a simple fork at end. A pair of small lateral spines may or may not be present. Eye large and asymmetrical, nearly one-fifth length of body, the eyeball two-thirds length of eye. The pigment is dark, usually with a small lighter-coloured area at one end. Labrum with large spine. Antennal scale very long and slender; flagellum nearly Fig. 46. S. vigilax. a, Acanthosoma i; b, Acanthosoma 2. as long as carapace with rostrum. Mandible without palp. Pleopods present as small buds. Exopod of uropod slender, bare part half length of setose part. Colour. Red in thorax and abdominal somite 3. A little red in eyestalks and near end of flagellum. Acanthosoma 2 (Figs. 46 b, 47). Length 3-2 mm. Rostrum 1-05 mm. Generally as in stage i but supraorbital and lateral spines shorter. Eye somewhat larger, nearly one-quarter length of body, and greatest diameter of eyeball about half length of eye. Antennal scale very long and slender, with apical spine; flagellum 3-8 mm.
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