
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

PG Notes 2016 : Biology

4 pages, 0 questions, 0 questions with responses, 0 total responses,

P K Agrawal
Sacred Heart Convent Higher Secondary School, Mathura
10

+Fave Message

Profile Timeline Uploads

Home > ritvij >

Formatting page ...

Dichotomous Keys INSECTS Dr. P . K. Agrawal Head, Deptt. of Zoology, BSA College, Mathura Tips: Only adult arthropods are included, and certain uncommon orders are not included. To use a key, read both descriptions in a couplet (for instance, 1a and 1b). Decide which sounds most like your insect, and move to the next couplet indicated. Some orders are found more than once in the keys, because the arthropods occur in different forms. STE FROM P CHARACTERS 1a One pair of wings. . . . . . . . . . go to 2 1b ORDER / CLASS Two pairs of wings. . . . . . . . . . go to 3 2a 1a Hind wings reduced to tiny knobs (halteres), tip of abdomen without 2-3 thread-like tails DIPTERA (Flies) 2b 1a Hind wings not reduced to tiny knobs, tip of abdomen with 2-3 thread-like tails (caudal filaments) EPHEMEROPTERA (Mayflies) 3a 1b Front and hind wings have similar texture. . . . . . . . . . go to 4 3b 1b Front wings a rigid or leathery covering for clear hind wings. . . . . . . . . . go to 14 4a 3a Wings covered with powdery scales, mouthparts usually a coiled tube (proboscis) for sucking LEPIDOPTERA (Moths / Butterflies) 4b 3a Wings not covered with powdery scales, mouthparts not a coiled tube. . . . . . . . . . go to 5 5a 4b Wings slope downwards (rooflike) from the center at rest. . . . . . . . . go to 6 5b 4b Wings not held rooflike at rest. . . . . . . . . . go to 9 Dr. P. K. Agrawal

Related ResPapers
PG Notes 2016 : Biology
by ritvij

Formatting page ...

ritvij chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: