Here we reexamine both the published literature and our own unpublished data to test the applicability of the tubule recruitment model to the class Holothuroidea in general, and particularly to the aspidochirote holothurians.
However, in subsequent reviews it was suggested that the model had broad-scale applicability to ovarian development throughout the class Holothuroidea (Smiley, 1990; Smiley et al.
The order Dendrochirotida is the most speciose in the class Holothuroidea, with 553 of the 1427 species (Smiley, 1994).
Consequently, from morphological evidence alone, we question the general applicability of the tubule recruitment model to describe reproduction in the class Holothuroidea.
The aim of this review has been to assess the applicability of the tubule recruitment model to species from all orders of the class Holothuroidea, and the validity of this conceptual model as a general paradigm for ovarian development in holothurians.