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
Define Drug metabolism (Poly-pharmacy)? As older persons are sometimes prescribed number of medications, care is to be taken, as there is reduction in renal and hepatic clearan

Planning of Nursing Care Planning of the nursing care depends on the decision of the surgery. The surgery may be performed in two stages depending upon the degree of the d

Endosperm with micropylar Haustorium A very prominent and aggressive micropylar haustorium is seen in Impatiens. Here the division of the primary endosperm nucleus is followed

Q. What is the name of the sea anemones and larva of corals? What is the biological importance of that larval stage? Sexual reproduction in sea anemones and corals have a larva

What is the difference between embryo and endosperm?

What is the best microscope to get a detailed view of the parts inside of a preserved plant cell

what are the general characters of chordates? At least 10 characters.

Which two of the following changes (a - d) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)? 1. Enhance in red blood cell size 2

The pumps The blood from the operating field is sucked with the help of the cardiotomy sucker and pump, which is filtered to remove all particulate matter and then pass

Explain Zipping of the Apical Canal a. If the preparation is continued with progressively larger and stiffer file lead to : zipping perforation or tear apical foramen.