Class of subphylum uniramia - symphyla, Biology

Class of Subphylum Uniramia - Symphyla

Symphyla is yet other small myriapodous group that includes around 160 described species. These are also soil living forms and live in leaf molds also. They measure approximately 1 to 8 mm in length and have a trunk Lade of 13 segments but 15-22 tergal plates. Only 12 segments bear a pair of legs each and the 13th segment bears a pair of cerci or spinnerets. The 13th segment as well bears a pair of sensory, hairs called trichobothria. These animals can run fast through humus. The hunk terminates in a tiny telson. Mouth parts include a pair of mandibles two pairs of maxillae of that the second pair of maxillae is fused to make labium. A pair of spiracles opens, on every side of the head and the trachea arising from them supplies only the first three segments. Eyes are not present but a pair of Tomosvary's organs is present. Symphylans show peculiar copulatory behavior. The males deposit 150 to 450 spermatophores which are swallowed by the female. There are stored in particular buccal pouches. Then she releases the eggs through a single gonopore located on the ventral surface of the fourth segment. The eggs are attached to the substratum and the sperms are smeared over the eggs through the female to fertilize them. Development is anamorphic. Parthenogenesis is as well common in Symphylans e.g. Scutigerella.

Posted Date: 2/4/2013 12:40:41 AM | Location : United States







Related Discussions:- Class of subphylum uniramia - symphyla, Assignment Help, Ask Question on Class of subphylum uniramia - symphyla, Get Answer, Expert's Help, Class of subphylum uniramia - symphyla Discussions

Write discussion on Class of subphylum uniramia - symphyla
Your posts are moderated
Related Questions
Body Cavity and Coelom - Metazoa Vacuoles, spaces, lacunae and cavities have been of importance in all organisms, may it a be plant or animal. All animals have cavities. The c

Differences between cells of Prokaryotes and Eukaryotes The prokaryotes also differ from the eukaryotes in many other ways, as you can see from Table. Table: Differences

Q. One characteristic of the DNA molecule is its replication capability. What are the consequences of failures during the DNA replication? Ideally the DNA molecule should replicate

Q. What are the difference between plasma membrane and cell wall? Plasma membrane and cell wall is not the same thing. Plasma membrane, also known as cell membrane, is the exte

Q. Angiographic Findings and Interpretation? Pulmonary angiography is useful in the following clinical scenarios: 1) Pulmonary artery stenosis 2) Pulmonary arteriovenous

Q. What is the kinds of asexual reproduction that occurs in hydras? Hydras reproduce asexually by budding.

Where in the leaves is photosynthetic tissue often located? The major photosynthetic tissue is the photosynthetic parenchyma (also known as chlorenchyma, do not confuse with co

Lateral Roots - Root Apex Lateral roots normally arise at a definite distance behind the tip from areas close to or opposite the points of xylem star. So, a triarch root can

Secondary Egg Envelopes These are secreted by oviducts and other accessory parts of genital organs while the egg is passing through them from ovary to the exterior. a) In

GENERAL NURSING RESPONSIBILITIES IN DIAGNOSTIC PROCEDURE Let us understand what are the general responsibilities of nursing personnel while assisting in diagnostic procedure