फ़ायरब्रेट्स; सिल्वरफिश; माचिलिड्स

thysanura's Usage Examples:

Lamarck included the Thysanura and the Myriapoda in his class Arachnida.

In most respects, the shortened abdomen, for example, they are more specialized than the Thysanura, and most of the features in which they appear to be simple, such as the absence of a tracheal system and of compound eyes, can be explained as the result of degradation.

- Reasons have been given for regarding the Thysanura as representing, more nearly than any other living group, the primitive stock of the Hexapoda.

It is most unlikely that wings have been acquired independently by various orders of Hexapoda, and if we regard the Thysanura as the slightly modified representatives of a primitively wingless stock, we must postulate the acquisition of wings by some early offshoot of that stock, an offshoot whence the whole group of the Pterygota took its rise.

Brauer, that the Thysanura represent more nearly than any other existing insects the ancestors of the class, has been accepted by the great majority of students.

Thysanura (Bristle-tails): with ten abdominal segments; number of abdominal appendages variable.

In the adult state no insect possesses more than six legs, and they are always attached to the thorax; in many Thysanura there are, however, processes on the abdomen that, as to their position, are similar to legs.

The stylets, when present, are placed on the ninth segment, and in some Thysanura exist also on the eighth segment; their development takes place later in life than that of the cerci.

In interpretations of Kowalevsky and Heider, and so on the whole do Orthoptera and Thysanura, as well as some others of the lower those of F.

Thysanura >>

thysanura's Meaning':

firebrats; silverfish; machilids