Borojevic, R.; Boury-Esnault, N.; Manuel, M.; Vacelet, J. (2002). Order Leucosolenida Hartman, 1958. Pp. 1157-1184. In: Hooper, J.N.A.; Van Soest, R.W.M. (eds) (2002). Systema Porifera: a guide to the classification of sponges. 2 volumes. Kluwer Academic/Plenum, NY, 1708 + xvliii. ISBN 0-306-47260-0 (printed version).
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Borojevic, R.; Boury-Esnault, N.; Manuel, M.; Vacelet, J.
2002
Order Leucosolenida Hartman, 1958. Pp. 1157-1184
In: Hooper, J.N.A.; Van Soest, R.W.M. (eds) (2002). Systema Porifera: a guide to the classification of sponges. 2 volumes.
Kluwer Academic/Plenum, NY, 1708 + xvliii. ISBN 0-306-47260-0 (printed version)
Publication
The PDF supplied here is a proof - NOT the definitive printed text - of a chapter of the Systema Porifera
Leucosolenida Hartman (Calcarea, Calcaronea) is emended here to include nine families, and 42 genera. Leucosolenida seems to have
evolved from the olynthus grade, a form that is probably present in the early stages of ontogenesis of all Leucosolenida, and subsists at the
adult stage in Leucosolenia. Leucosolenida comprises a diverse group with several pathways of progressive complexity of form, starting
with sponges of a simple sycettid organization and leading to sponges with a complex aquiferous system and skeleton. Increase in size
from the sycettid grade of organization may occur by two different processes: (1) the growth and elongation of radial tubes increasing the
thickness of the sponge body (seen in the Sycettidae-Grantiidae line and the Heteropiidae), or (2) the growth of the central tube containing
the atrial cavity which increases the length of the sponge body (seen in the Jenkinidae and the simple forms of Amphoriscidae).
