Web5.1 General Explanation. The class Ophiuroidea is divided into two orders, Ophiurida, the brittle stars, and Euyalida, the basket stars. This section focuses on the more prevalent brittle stars. Brittle stars arguably are the most diverse group of echinoderms, exhibiting an extensive array of distinct reproductive and developmental modes, which ... WebThe reproductive system is unique amongst echinoderms. The sexes are separate, and the gonoducts of each pair of 10 gonads are fused to form a single, interradial duct leading to a gonopore that opens in the females at the body margin, and in the males, slightly beyond the margin as the penial projection, which is most likely used for copulation.
Concentricycloidea (Sea Daisies) Encyclopedia.com
WebNeural factors also play a role in the regulation of echinoderm reproduction. A gonad-stimulating substance (GSS), secreted from the radial nerves and also called the radial nerve factor (RNF), is known to be involved in the control of maturation and spawning of oocytes in echinoderms. WebReproduction in echinoderms is typically by external fertilization; eggs and sperm are freely discharged into the water. A few sea urchins brood their eggs in special pouches, but most provide no parental care. Most echinoderms go through several planktonic larval stages before settling down. slavery in germany 1800s
Echinoderms - MESA
WebAug 25, 2024 · The echinoderm nervous system is loosely organized with a neural net that covers the body and coordinates movement and sensory input. ... Female Reproductive System Lesson for Kids WebThe reproductive system in female specimens consists of ten separate ovaries, two in each ray. Each ovary is made up of a rachis with lateral primary and secondary folds: the acini maiores and acini minores. The ovarian wall is composed of an outer and in inner part, separated by the genital coelomic sinus. WebEchinodermata derives from the sane "spiny skin" and includes such organisms as starfish and brittle stars. Parts of the skeleton project through the body wall. These organisms that are found only in the marine environment possess radial symmetry where the rays occur in five or multiples of five. slavery in german history