In Greek mythology, the name Leucon (/ ˈ lj uː k ɒ n /; Ancient Greek: Λεύκων) may refer to: Leucon, a son of Themisto by either Athamas [1] or Poseidon. [2] His children were Erythras, [3] Pisidice, [4] Hyperippe [5] and Euippe (mother of Eteocles by Andreus). [6] He was said to have died of a sickness. [7] Leucon, one of Actaeon's ...

of canals—ascon, sycon, and leucon. The simplest, or ascon, type, found only in certain primitive genera of the Calcarea (e.g., Leucosolenia), is characterized by an arrangement of choanocytes around a central cavity that directly communicates with the osculum. The walls of these sponges are thin, lack canals, and are… Read More

The meaning of LEUCON is a sponge or sponge larva having a complex structure in which the flagellated layer is restricted to numerous small interstitial chambers intercalated between the incurrent and excurrent canals and the paragaster is reduced or lacking.

2024年3月20日 · 3. Leucon type of canal system. This form of canal system is the consequence of further body wall folding of the sycon type of canal system. This canal system is a distinguishing feature of leuconoid sponges, such as Spongilla. Due to the complexity of the canal system, radial symmetry is lost in this kind, resulting in an irregular symmetry.

Sponges can have three different body forms: ascon, sycon, or leucon. But all three body forms carry out the same basic functions. For instance, each body form's wall is covered with pinacocytes, beneath this layer is the mesophyl. Inside the mesophyl layer lies mesenchyme cells which move around the mesophyl layer.

2019年5月8日 · 芽球gemmule 是指在中胶层中，由一些储存了丰富营养物质的原细胞聚集成堆，外包具有几丁质和一层双盘头或者短柱状的骨针。 当成体死亡后，无数的芽球可以生存下来，等到环境适宜，从芽球上开一个小口发育）、 有性生殖 （有些为雌雄同体，有些为雌雄异体，精子和卵由卵细胞或者领细胞发育而来，卵在中胶层中，精子不直接入卵，而是由领细胞吞食精子后，失去鞭毛和领成为变形虫状，将精子带入卵，进行受精。 就钙质海绵来说，受精卵进行卵 …

Pumping is carried out by flagellated chambers that are connected to an inhalant and exhalant canal system. In ‘leucon’ sponges with relatively high-pressure resistance due to a complex and narrow canal system, pumping and filtering are only possible owing to the presence of a gasket-like structure (forming a canopy above the collar filters).

2016年1月21日 · Leucon (Leucon) echinolophotos n. sp. is a new species from off Enderby Land, Antarctica. Keys to the Australian leuconid genera and species are included. The collections of the Museum Victoria have yielded six new leuconid species in five genera from Australian waters: Austroleucon adiazetos n. sp.,

There are three types of sponge body forms: ascon, sycon, and leucon. Ascon sponges are the simplest and least common sponge body from. These sponges have multiple ostia, this is where water enters the sponge, and only have one osculum, where water exits the sponge.

2007年1月15日 · Leucon. A son of Poseidon or Athamas and Themisto, 1 was the father of Erythrus and Evippe. According to Apollodorus, 2 he is the brother of Eurythrus.