The following academic paper highlights the up-to-date issues and questions of External Features Of Annelids. This sample provides just some ideas on how this topic can be analyzed and discussed.
The nervous system includes a pair of cephalic ganglia attached to double nerve cords that run the length to the animal along the ventral body wall, with ganglia and branches in each segment. Annelids have some combination of tactile organs, competitors, balance receptors, and photoreceptor’s: some forms have fairly well developed eyes, including lenses. The annelids number more than 13,000 species distributed among three classes: the marine worm (Polyphosphate), which are divided into free moving and sedentary or tube-dwelling forms; the earthworms (Oligocene); and the leeches, (Hernia).
Polyphosphate can be found in the intestinal zone up to -?5000 meters of the ocean depth. Oligocene and Hardliner can be found in land. Objectives I. TO introduce student With the morphological Structure Of Annelids 2. TO introduce a technique to isolate Annelids worm from sediments 3. To draw the important structures of this group for identification using compound microscope. Apparatus ; Stereo microscope ; Compound microscope ; Petri dish ; Forceps ; Annelids samples Methods 1. Extracted samples which contain Polyphosphate, Oligocene, and Hardliner were taken.
The samples were washed with water and transferred into a Petri dish, 2, The samples were differentiated into Polyphosphate, Oligocene, and Hardliner group. 3. The samples oeuvre viewed under the compound microscope and the structure of Polyphosphate, Oligocene, and Hardliner ever drawn. 4. For Polyphosphate, the Structures that has been stressed on for identification was paranoia, promethium, peritoneum, peristalsis cirri, antenna, pal, eyes, and types Of setae. S. For Oligocene, the Structures that has been stressed on for identification was promethium, mouth, setae, spermatophyte, xenophobe, sperm Nell, cellulite and tubercle. . The above Structures were drawn and the functions of each structure were explained in discussion. Discussion Every each to organisms has their own structures and every structure have its own function, As annelids are small organisms, all the structure need to observe under the compound microscope. Some tooth structure could not be observed as it is internal structure of the annelids, The observation of the annelids was done for the external structure only. Table 1. 1 below shows the results and the structure that can be observed in annelid samples provided.
Structure Of Annelids
Structures Polychaetaoligochaeta Hardening Paranoia / Promethium / Turbulence Peritoneum / Peristalsis cirri Antenna – Pal/ Eyes/ Mouth /// Spermatophyte Snooper . / / Sperm funnel – Cellulite. – Table 1. 1 Polyphosphates have paranoia, fleshy, beadlike lobes on each segment. Paranoia are attention in locomotion and gas exchange. Setae are located on the paranoia. Setae in annelids are bristle or hair like structures found in living organisms. They help in balancing of some living organisms like earthworms not to backslide, It often functions like a kind of overlie when the animal is feeding.
The shape and composition of promethium are important for annelid systematic. The anterior end has a mouth opening. Covered by a lobe termed promethium. The posterior segment bears the anus. The first section behind the promethium, called the peritoneum (Greek meaning “around” and rope meaning “mouth”), is regarded by some zoologists as not a true segment, but in some polyphosphates the peritoneum has cheetah and appendages like those of other segments. Peristalsis cirri are paired, elongated cirri on the peritoneum.
Several fused segments compose that region, which is confirmed by the presence f several fused ganglia along the ventral nerve cord. Anterior locomotors appendages: the pair Of head appendages located ventilator’s on the peritoneum. These aids in locomotion, fixation on the host, and feeding. They are retractile, and are also known as anterior limbs. Factual & Rouse (1997) has cited in Titian Machine Steiner; A. Cecilia Z. Amoral: The family Histrionically (Annelid, Polyphosphate) including descriptions of two new species from Brazil and a new genus- termed them peristalsis cirri because they are located on the peritoneum.
Other families of Annunciated order have the peristalsis cirri coated dorsally and posterior on the peritoneum. A pair of pals which are differentiated into two units, the distal unit of which is substantial even though it is smaller than the proximal unit. Pals and antennae are located on the head to many polyphosphates. In some groups they are both sensory while in others the pals are used for feeding. A spermatophyte function in annelids is to receive and store sperm from the male or, in the case of hermaphrodites, the male component of the body, and can sometimes be the site of fertilization when the octets are sufficiently develop.
The conducts (oviduct/vagina and sperm duct) usually open via a common opening, with the ducts leading into a hemispherical chamber called the genital atrium which opens to the outside via the snooper. The snooper is at one side of the proctologist, either central or toward one end. A sphincter muscle can open or close the snooper. The snooper Of each proctologist may all occur on the same side of the worm, as in our piece of worm drawn above, or they may be on both sides in an irregular and random fashion. (Though each proctologist only has one snooper on either did).
In some species, there is a double system with each proctologist having NON snoopers, one on each side. The sperm funnel, Which consists Of a ciliated epithelium bounded by a flattened peritoneum, is characterized by a “halo” of vertically orientated spermatozoa. The spermatozoa nuclei terminate within the culinary zone of the funnel but junction attachments been sperm and cilia have not been observed. A tubercle is knob. Like protuberance, often referring to a large (macromolecule) or small (micrometeorite) projection on the Elton of some annelids.
The cellulite is part of the reproductive system of classmates, a subgroup of annelids which contains lighthouses (earthworms) and hardiness (leeches). The cellulite is a thick, saddle-like, ring found in the epidermis (skin) of the worm, usually with a light-colored pigment. To form a cocoon for its eggs, the cellulite secretes a viscous fluid. This organ is used in sexual reproduction of some annelids. The cellulite becomes apparent in mature annelids, but may be hard to locate visually in younger annelids. In leeches, it appears seasonally.
Its lour is usually slightly lighter than that of the body of the annelid, Occasionally, living segments of the worm will be shed with the cellulite. Cellulite produces a slime tube that slides forward toward the anterior segments As it passes along, it receives deposits of eggs and sperm from another individual that has been stored in the seminal receptacles, Fertilization occurs within the mucous cocoon, which is then deposited in the soil. References I. Hemming, T. P. (1 981), The littérateurs Of the sperm funnel and nor-I-glandular Vass deferent of Tubbier tubbier (Annelid: Oligocene).