Hyalonematidae
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| Hyalonematidae | |
|---|---|
_Figure_55.jpg) | |
| Hyalonema sp. (Family: Hyalonematidae) anchored in soft sediment. | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Porifera |
| Class: | Hexactinellida |
| Order: | Amphidiscosida |
| Family: | Hyalonematidae |
Hyalonematidae is a family of deep-sea glass sponges (class Hexactinellida) comprising five genera.[1] They are known for their unique siliceous spicules called amphidiscs and skeleton structure primarily composed of diactins, large, rod-like megasclere spicules found within the sponge's internal tissue (choanosome).[2][3] Hyalonematidae have been recorded at depths of up to 6000 meters and have a global distribution, though they have not been documented in the Arctic Ocean.[4] Initially mistaken for corals due to their fibrous base, Hyalonematidae were later recognized as glass sponges and classified within the order Amphidiscosida.[4] These sponges are generally hermaphroditic and reproduce both sexually and asexually.[5]
The family Hyalonematidae includes five genera: Hyalonema characterized by long basalia forming a stalk-like structure.[6][7] Chalaronema, recognized by its unique skeletal framework.[8][9] Composocalyx, characterized by its distinct cup-shaped body morphology[10]. Lophophysema, known for its elaborate spicule arrangements,[11] and Tabachnickia, A more recently described genus within the family.[12]
Genera:[13]
- Chalaronema Ijima, 1927
- Composocalyx Schulze, 1904
- Compsocalyx Schulze, 1904
- Hyalonema Gray, 1832
- Lophophysema Schulze, 1900
- Tabachnickia Özdikmen, 2010
Morphological Features
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Members of Hyalonematidae have a skeleton primarily made of siliceous spicules, with amphidiscs being a defining microsclere type.[14] The body structure is typically supported by pentactinal (five-rayed) megascleres, and many species have prostalia, bristle-like structures, formed by single-rayed spicules.[14] In certain species, the basalia are bundled to form anchoring structures that suspend the sponge above the seabed, this is an adaptation to their deep-sea habitats.