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  1. WoRMS
    https://www.marinespecies.org/porifera/porifera.php?p=sourcedetails&id=...

    World Porifera Database - Species

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    What is Clathrina clathrus?
    Clathrina clathrus is a calcareous sponge of 10 cm in diameter forming a tangle of tubes which are between 0,5 and 3 mm in diameter and interconnected in a very dense network. The oscules, quite visible, are located at the intersections of the largest tubes. It is translucent and bright yellow.

    description of Clathrina clathrus - Yellow lace sponge

    european-marine-life.org
    Why is Clathrina a difficult genus?
    The genus Clathrina has one of the most difficult systematic arrangements in the Porifera, Class Calcarea. Few morphological characters can be used to describe its species, and the systematics and the geographical distribution of its species have changed several times, according to the point of view of the systematists.

    Revision of the genus Clathrina (Porifera, Calcarea)

    academic.oup.com
    What genus is Clathrina?
    The genus Clathrina is defined almost exclusively by negative characters ( Borojevic & Boury-Esnault, 1987 ). It has the simplest organization among the sponges − the asconoid aquiferous system − which means that all the cavities are lined by choanocytes.

    Revision of the genus Clathrina (Porifera, Calcarea)

    academic.oup.com
    Where did Clathrina come from?
    Tanita (1943) described this species from Japan. Borojevic & Peixinho (1976) described it from Brazil, calling it Clathrina for the first time. Although the specimens collected in these three localities have the same kind of spicules − triactines, tetractines of two different sizes and diactines − they are not identical.

    Revision of the genus Clathrina (Porifera, Calcarea)

    academic.oup.com
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