English: A and B after Fritz Müller in Archiv. für Naturgeschichte, vol. xxix., 1863; C, D, and E after C. Claus, Untersuch. zur Erfarschung Crurlaceen-Systems.

Fig. 3.—Drawings showing various stages in the larval history of Penaeus. A, Nauplius larva, dorsal view, showing the three pairs of appendages and the simple median eye. B, Protozoaea larva, dorsal view, the rudiments of the paired eyes are visible through the cuticle, by which the rudiments of the maxillae are still covered. C, Older Protozoaea, dorsal view; the six posterior thoracic segments are distinct, but the five abdominal segments are still hidden beneath the skin. D, Zoaea larva, ventral view, with the rudiments of the thoracic limbs and the appendages of the sixth abdominal segment. E, Mysis stage, side view; the thoracic and abdominal appendages have been developed. (1) first antenna; (9) thorax; (2) second ,, (10) abdomen; (3) mandible; (11) liver; (4) first maxilla; (12) frontal sense organ, just behind (5) second ,,  which are the compound eyes; (6) first maxilliped; (a1) to (a6) the six abdominal (7) second  ,,  appendages.

(8) third  ,,