Ostia definition. A pinacocyte is a.... Sponge epithelioid cell. In zoology, sessility applies to those animals which are attached to a substrate.Most often these are marine animals, such as mussels, although parasites such as the cochineal insect assume a fixed life cycle upon their plant hosts. a small opening or orifice, as at the end of the oviduct. Level. Classification. one of the tiny holes in the body of a sponge. Contents: Description of Sponges Structure of Sponges Canal System of the Sponges Histological Elements Constituting the Wall of Sponges Reproduction and Development in … noun ostia a town in central Italy, SW of Rome: ruins from 4th century b.c. ADVERTISEMENTS: In this article we will discuss about:- 1. What did Rome have to trade? Canal System 4. Spain, France, the Middle East and north Africa were the main trading partners. Amoebocytes are motile cells that can transform themselves into any other cell. Zoology Lab Quiz 2 (Just Pictures) Flickr Creative Commons Images. Ostia. How to use osteria in a sentence. Osteria definition is - a wayside inn. Zoology. Definition for ostia (2 of 2) Anatomy, Zoology. a small opening or orifice, as at the end of the oviduct. Structure of Sponges 3. Definition of Dermal Ostia - Ostia is a pore present exteriorly on the body wall by which water enters inside first. Created. The osculum (plural "oscula") is an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel.Wastes diffuse into the water and the water is pumped through the osculum carrying away with it the sponge's wastes. Porocyte definition. External opening of porocyte. In contrast to a closed system, arthropods (including insects, crustaceans, and most mollusks) have an open circulatory system. 1; noun plural ostia Anatomy, Zoology. Graduate. Ostia of sea anemone: pores or openings that allow circulation of fluids between adjacent body or organ sections. Hemolymph returns to the blood vessel through openings called ostia. 1; noun plural ostia Zoology. one of the tiny holes in the body of a sponge. Zoology. Definition. Channels that allow water into the sponge. -Acoelomate: animals whose central space is filled with tissue (mesoderm). Porocyte. Rhabdodermella: Definition. Chapter 7 Platyhelminthes -Platyhelminthes: flatworms -Triploblastic: referring to an animal whose body develops from three embryonic tissue layers. 10/23/2016. Non-feeding, dispersal larva found in Scypha sponges. ; site of ancient port of Rome. Reproduction and Development 6. ... Zoology Lab Quiz 2 (Bacteria and Protozoa) 14 terms. Demonstrates Sycon grade of structure with several smaller Ostia channels surrounding the central Spongocoel: Term. They play a vital role in structure, digestion, reproduction, and regeneration. 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