Developmental stages in the brooding sea cucumber Cladodactyla crocea (Lesson, 1830) in the southwestern Atlantic Ocean

MARTINEZ, MARIANO I.; ALBA-POSSE, EZEQUIEL J.; LAURETTA, DANIEL; PENCHASZADEH, PABLO E.

POLAR BIOLOGY

SPRINGER

Año: 2018

0722-4060

Holothuroids of family Cucumariidae are known to brood their young, and several species from Southern Oceans presentdifferent brooding mechanisms, indicating the heterogeneity of this family in this regard. Since few reports analyze thebrooding in this family, we studied the reproduction and development of brooders, in the cucumariid Cladodactyla crocea(Lesson, 1830), based on samples taken on several cruises between 38° and 55° up to 1738 m depth, from September 2009to October 2016. Brooder specimens develop a dorsal marsupium where uncleaved eggs of about 0.94 mm are released inthe fall and brooded, until juveniles are released in the following spring. Unreleased eggs of about 0.93 mm were also foundin the fall, in the gonads. In addition, in the spring samples, we found ten specimens with 15 cleaved eggs of about 1.1 mmand 34 specimens with 2?35 brooded juveniles, in adults of 14.0?20.0 mm of length. Several adults had up to three differentdevelopmental stages at the same time: young pentactula (about 1.6 mm), pentactula (about 1.8 mm), and early juveniles(about 2.2 mm). The external brooding behavior of C. crocea is consistent with the observations made for other species ofCucumariidae in South America and Antarctica. Brooding is a common feature in species of Cucumariidae from the SouthernHemisphere. External brooding is common in South America and Antarctica specimens, while internal brooding hasmultiple examples in Australia and New Zealand. These different brooding strategies are discussed after the observationsmade in C. crocea.