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Phyllodermia spinosa Schrammen 1924 Phyllodermia spinosa is a rare sponge and the example shown here is an exceptionally large one. It has a central paragaster, surrounded by radiating furrows. At the bottomside, there are a number of strong roots. The roots and the underside are covered by a smooth dermal layer made up of numerous phyllotriaenes while the upper side is rough, due to the exposed skeleton which is made up of tetraclones. The tetraclones are smooth or only slightly sculptured and are united via zygomes. |
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Phyllodermia secata Schrammen 1924 Phyllodermia secata has a strong central root and various root-like lobes extending sideways. On the top center, there is a paragaster outlet surrounded by radiating, anastomosing furrows. The underside and outer margin of the sponge are covered by a cortex, consisting of phyllotriaenes. The skeleton is composed of large, strongly branching tetraclones, united via zygomes. |