Oocyte size suggests the presence of larvae in deep-sea acorn worms Torquaratoridae (Hemichordata, Enteropneusta)

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Abstract

It is known that the type of development of marine invertebrates is related to the size of the eggs. Data on the maximum size of oocytes of deep-sea acorn worms of the Torquaratoridae family are presented. It has been suggested that among the Torquaratoridae there are species with direct development, species with lecithotrophic larvae and species with planktotrophic larvae. Mysterious giant larvae of Planctosphaera pelagica may be planktotrophic larvae of Torquaratoridae.

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About the authors

O. V. Ezhova

Lomonosov Moscow State University

Author for correspondence.
Email: olga_ejova@mail.ru
Russian Federation, Moscow

A. I. Lukinykh

Lomonosov Moscow State University

Email: olga_ejova@mail.ru
Russian Federation, Moscow

V. V. Malakhov

Lomonosov Moscow State University

Email: olga_ejova@mail.ru

Academician of the RAS

Russian Federation, Moscow

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2. Fig. 1. Ovaries (shown by arrows) (A) and an individual oocyte (B) of Quatuoralisia malakhovi. Scale: (a) – 200 µm, (b) – 50 µm.

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