Briefly describe asconoid, syconoid, and leuconoid body types in sponges. 请简要描述 海绵动物 中单沟型、双沟型和复沟型水沟系。 4. What sponge body type appears most efficient and makes possible the largest body size? 哪种 海绵体 型最高效，使其成为目前可能最大的动物？ 5. Define the following: ostia, osculum, spongocoel, apopyles, prosopyles, spicules. 定义如下名词：入水口、出水口、海绵腔、后幽门孔、前幽门孔、骨针。 6.

2024年3月20日 · Several genera of calcareous sponges possess the Syconoid (Stage III) canal system, including Grantia, Grantiopsis, Heteropia, Ute, etc. The problem is caused by the dermal membrane (composed of epidermis and a thin layer of mesenchyme) forming a variable-thickness cortex over the entire surface of the sponges.

Scypha, genus of marine sponges of the class Calcarea (calcareous sponges), characterized by a fingerlike body shape known as the syconoid type of structure. In the syconoid sponges, each “finger,” known as a radial canal, is perforated by many tiny pores through which water passes into a single central cavity.

The Syconoid (Stage III) canal system is found in many genera of calcareous sponges, viz., Grantia, Grantiopsis, Heteropia, Ute, etc. The complication is due to the spreading of the dermal membrane (consisting of epidermis plus a thin layer of mesenchyme) over the entire surface of the sponges to form the cortex of variable thickness.

2020年11月30日 · Syconoid forms, in turn, possess many ascon-shaped cylindrical chambers branching off a central cavity (atrium). Water enters through short canals or directly through openings (ostia) into the chambers and leaves through a single outlet (apopyle) to the atrium and from there out of the osculum.

Sycon is a solitary sponge that may live singly or form clusters by budding. The vase-shaped, typically syconoid animal is 1 to 3 cm long, with a fringe of straight spicules around the osculum to discourage small animals from entering. Class Hexactinellida (Hyalospongiae): Glass Sponges

The syn­conoid body wall is thicker and the pores that pen­e­trate it are longer, form­ing a sys­tem of sim­ple canals. These canals are lined by col­lar cells, the fla­gel­lae of which move water from the out­side, into the spon­go­coel and out the os­cu­lum. The third cat­e­gory of …

2023年2月6日 · Sponges can be classified into two main types based on the structure of their canal system: Asconoid, Syconoid, and Leuconoid. The simplest of the three canal systems is this one. It can be found in asconoid sponges like Leucosolenia and some of the second sponges’ developmental phases.

2024年6月14日 · Sycon, a genus of calcareous sponges within the family Sycettidae, is known for its tube-shaped structure and small size, typically reaching lengths of 2.5 to 7.5 cm. These sponges are often white to cream in color and are recognized by aquarium enthusiasts as “Pineapple” or “Q-Tip” sponges.

Syconoid type of canal system is the first stage above the asconoid type. It is formed by the out-pushing of the wall of an asconoid sponge at regular intervals into finger-like projections, called radial canals.