Discovery reports (1941) Discovery reports discoveryreports20inst Year: 1941 LARVAE OF SERGESTES 49 Mastigopus I (Figs. 39 a, b, 40). Length 2-6 mm. Rostrum o-6 mm. Rostrum reaching beyond segment i of antennule. Supraorbital spines minute; hepatic, marginal and posterior dorsal spines absent. Abdominal somites 1-3 without dorsal spines; somites 4 and 5 with large dorsal spines. All somites with rather large pleural points. No median ventral spines. Telson narrow, greatest width nearly one-third length, with small apical fork. Fig. 39. S. pectinattis. a, Mastigopus i; b, telson. Eye very
Discovery reports (1941) Discovery reports discoveryreports20inst Year: 1941 LARVAE OF SERGESTES 49 Mastigopus I (Figs. 39 a, b, 40). Length 2-6 mm. Rostrum o-6 mm. Rostrum reaching beyond segment i of antennule. Supraorbital spines minute; hepatic, marginal and posterior dorsal spines absent. Abdominal somites 1-3 without dorsal spines; somites 4 and 5 with large dorsal spines. All somites with rather large pleural points. No median ventral spines. Telson narrow, greatest width nearly one-third length, with small apical fork. Fig. 39. S. pectinattis. a, Mastigopus i; b, telson. Eye very large, asymmetrical, with very short stalk, and turned backwards in charac- teristic manner. Antennal scale very long and slender (11: i); fiagellum much longer than body, without conspicuous setae, the end segments slightly swollen. Legs without trace of exopods. Legs 4 and 5 remaining as rather large vestiges. Maxillipede 3 with spine at outer distal end of carpus. Pleopods without endopods. Exopod of uropod six times as long as wide; setose part twice as long as bare part. Colour. Body colourless except for a vermilion patch in thorax. Antennal flagellum red at end and also, in later stages, with bands of red. In later stages the red in thorax extends to mouth region and base of eye, and red patches appear in somites 2-4 of abdomen. In early stages the body is bent in a characteristic way as shown in Fig. 39. The length of the antennal flagellum rapidly in- creases with age, as follows. Mastigopus I. Usually a little longer than body, but sometimes (Fig. 40) much longer, without kink, and with red at end, where it is slightly swollen. Mastigopus 2 (moulted from i). More than three times length of body, with several red portions at intervals, and with kink before first third. Dilated at end.
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