Abstract
The author identified I–VI zoeal stages of Spirontocaris intermedia (fem. Thoridae) from the plankton marine waters near Kamchatka peninsula. The basic morphological differences of larvae of the corresponding stages were identified. Descriptions and drawings of existing zoeal stages are given. A comparison of larvae with a closely related appearance of S. spinus was carried out. The close relationship of S. spinus and S. intermedia is evidenced by the similar sizes of larvae, the structure of maxillae, carapace, pleon, pereiopods, uropods and telson. There are morphological differences that do not allow these larvae to be attributed to one species: the structure of rostrum, pleopodes, maxillule, the second and third maxilliped, antennules and antennae at the corresponding stages of development, as well as the number of anteroventral spine of carapace. The asymmetry of the structure is characteristic of carapace, maxillule, maxillae, the first maxilliped, scale. According to the degree of development of most appendages, a noticeable lag in the development of S. intermedia is noticeable compared to S. spinus. It is suggested that S. intermedia develops through 7 zoeal stages.
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