This document describes the different types of modifications that insect legs can undergo. It begins by explaining the basic structure of a typical insect leg, which consists of six segments: the coxa, trochanter, femur, tibia, tarsus, and pretarsus. It then outlines 15 different types of leg modifications, including walking, running, jumping, clinging, digging, grasping, swimming, pollen collecting, sound producing, sticking, clasping, sucking, antenna cleaning, wax picking, and prehensile legs. Each modification type is adapted for a specific purpose and locomotion style. Examples are provided for each leg modification type to illustrate insects that exhibit that trait.
Structure and types of insect legs and identification of insect legs, Modification in insect legs - Cursorial leg(running leg), Ambulatorial leg(walking leg), Saltatorial leg(jumping leg), Scansorial leg(climbing leg), Fossorial leg(digging leg), Natatorial leg(swimming leg), Raptorial leg(grasping leg), Basket – like leg, Sticking leg, Foragial leg, Prolegs or False legs or Pseudolegs
Structure and types of insect legs and identification of insect legs, Modification in insect legs - Cursorial leg(running leg), Ambulatorial leg(walking leg), Saltatorial leg(jumping leg), Scansorial leg(climbing leg), Fossorial leg(digging leg), Natatorial leg(swimming leg), Raptorial leg(grasping leg), Basket – like leg, Sticking leg, Foragial leg, Prolegs or False legs or Pseudolegs
There are three main types of insects larvae
1. oligopod: Scarabeiform, Campodeiform
2. polypod: Hairy caterpillar, Slug caterpillar, Looper, Semilooper
3. apodous: Euciphalous, Hemicephalous, acephalous
1) OLIGOPOD: a) Campodeiform:
• Have resemblance to the dipluran genus campodea.
• Body is elongate, depressed dorso ventrally and well
sclerotised.
• Head is prognathous.
• Thoracic legs are long.
• A pair of abdominal cerci
is usually present.
• Larvae are generally predators
and are very active.
• Eg: grub of ant lion, grub of lady bird beetle
b) Scarabaeiform:
• Body is ‘C’ shaped, stout and subcylindrical.
• Head is well developed.
• Thoracic legs are short.
• Caudal processes are absent.
• Larva is sluggish, burrowing into wood or
soil.
• Eg: grub of rhinocerous beetle.
There are three main types of insects larvae
1. oligopod: Scarabeiform, Campodeiform
2. polypod: Hairy caterpillar, Slug caterpillar, Looper, Semilooper
3. apodous: Euciphalous, Hemicephalous, acephalous
1) OLIGOPOD: a) Campodeiform:
• Have resemblance to the dipluran genus campodea.
• Body is elongate, depressed dorso ventrally and well
sclerotised.
• Head is prognathous.
• Thoracic legs are long.
• A pair of abdominal cerci
is usually present.
• Larvae are generally predators
and are very active.
• Eg: grub of ant lion, grub of lady bird beetle
b) Scarabaeiform:
• Body is ‘C’ shaped, stout and subcylindrical.
• Head is well developed.
• Thoracic legs are short.
• Caudal processes are absent.
• Larva is sluggish, burrowing into wood or
soil.
• Eg: grub of rhinocerous beetle.
Insects, spiders, crabs, shrimp, millipedes, and centipedes are all arthropods. Arthropods have jointed feet, a segmented body, and an exoskeleton, a cuticle on the outside of their body. Arthropods have by far the greatest number of species of any animal group, at around 900,000 species
Photosynthesis is a biological process used by many cellular organisms to convert light energy into chemical energy, which is stored in organic compounds that can later be metabolized through cellular respiration to fuel the organism's activities.
Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg. Due to the embryos resulting from the same egg, the embryos are identical to one another, but are genetically diverse from the parents.
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Glycolysis is a series of reactions that extract energy from glucose by splitting it into two three-carbon molecules called pyruvates. This powerpoint Presentation includes all steps of glycolysis.
This ppt includes the brief introduction about class Insecta or Phylum Arthropoda. In this ppt families of Class Insecta and their suitable examples also have been discussed with pictures.
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In this ppt classes of Phylum Arthropoda have been discussed in very simple way with suitable pictures.
A presentation on study of special classification created with the help of fundamentals of Agriculture Written By Arun Katyayan. Images Source : Google
Remote Sensing and its Applications in AgricultureVikas Kashyap
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Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
2. 2
What are Legs?
“An insect usually bears three
pairs of legs which are located
on the ventral surface of
thoracic segments. They are
primary organs for running or
walking, but according to the
habit and habitat of insects they
are modified for different
purposes.”
3. 3
Structure of Insect Leg
A typical leg consists of the following parts:-
a) Coxa:- It is the basal segment and joint the leg with thorax.
b) Trochanter:- It is the small second division of the leg which
articulates with coxa but is usually fixed with femur.
c) Femur:- It is the largest and most powerful division of the leg.
d) Tibia:- It is the slender, usually quite long.
e) Tarsus:- It is the fifth divisional segment and generally sub
divided into 2-5 segments.
f) Pretarsus:- It is the last terminal segment of the leg which
represented of the leg which is represented by a complex set
of claws.
5. 5
Modifications of Leg
1. Ambutorial or Walking Type:-
It is generalized form of insect
leg, which is usually adapted
for walking.
Example:- Cockroach and
Bugs
6. 6
2. Cursorial or Running Type:- It is
almost similar to walking type
of leg, but it is differentiated by
the tarsus which is
comparatively longer and
touches the ground while
running.
Example:- Ants, Blister Beetle
and wasps.
7. 7
3. Saltatorial or Jumping Type:-
Such type of legs are present
in grasshopper, crickets and
flea beetle where the femur
of the hind leg get enlarged
and accomodates the
powerful tibial muscles.
Example:- Hind leg of
Grasshopper
8. 8
4. Scansorial or Clinging Type:-
This type of legs are smaller
and flat. The coxa are widely
separated and tarsi bears a
single claw.
Example:- Head Louse
9. 9
5. Fossorial or Digging Type:- This
type of legs are modified for
the purpose of digging. These
are powerful, broad and small
in size. Tibia and tarsus short
and broad with teeth like
projections.
Example:- Mole crickets and
Dung rollers.
10. 1 0
6. Raptorial or Grasping Type:-
Such legs are adapted for
catching the prey and are
found in Mantids. Coxa of fore
leg is more elongated whereas
the trochanter is small. Tibia is
spinous and fits along the
femur.
Example:- Preying Mantids
11. 1 1
7. Natatorial or Swimming Type:-
These type legs are found in
insects which lives in the water
and help them to swim. The
femur, tibia and tarsus are
flattened and posses the long
rows of hairs.
Example:- Dytiscus and Jaint
water bug.
12. 1 2
8. Foragial or Pollen Collecting
Type:- This type of legs are
found in worker honey bees
which is mainly adapted for
carrying the pollen from the
flowers. Tibia of the hind leg is
dialated and covered with longs
dense hairs which forms a
pollen basket.
Example:- Hind leg of Woker
Honey Bee.
13. 1 3
9. Stridulatorial or Sound
Producing Type:- These legs
are typically adapted for
producing sound wherein the
femur of hind leg is provided
with the row of pegs on its
inner side. These femoral pegs
work against the outer surface
of each tergum or coastal
margin of the fore wing,
thereby producing a sound.
Example:- Male Grasshopper
and cricket.
14. 1 4
10. Sticking Type:- In such type of
legs the pretarsus is highly
modified in a pair of claws and
a pair of pad like structure
known as pulvilli (found at the
base of claws). Hollow and
tubular hairs secrets a sticky
substance. These are also
known as Adhesive type of
legs.
Example:- House fly.
15. 1 5
11. Clasping Type:- This Such type
of legs are modified for
reproduction purposes. Coxa
and Trochater is comparatively
smaller while the Femur is
thick. The tibia is slender,
tarsus is one segmented and
arched. This adaptation helps
male to holds the female
during reproduction.
Example:- Chleredryinus
(Parasite of Sugarcane Pyrilla)
16. 1 6
12. Suctorial or Sucking Type:- This
type of legs are also modified
for the purpose of
reproduction in which coxa and
trochanter of fore legs are
small while femur is thick and
small. They are also helpful in
sticking with grasses and leaves
against the water flow.
Example:- Male Dytiscus.
17. 1 7
13. Antennal Cleaning Legs:-
This type of legs are
modified for the purpose of
cleaning antennae in which
tibia possess a movable
spine and the first tarsal
segment with a semi-circular
notch.
Example:- Front legs of
Honey Bees.
18. 1 8
14. Wax Pick Legs:- This type of
legs are modified for the
purpose of picking of wax
plate in which Tibia possess a
spine called wax pick for
removing the wax plates
from the ventral side of the
abdomen.
Example:- Middle legs of
Honey Bees.
19. 1 9
15. Prehensile:-
This type
of legs are modified
for the purpose of
catching prey and
basket forming.
Example:- Dragon
Flies.
20. 2 0
For any questions or doubts you can find
me:
Twitter:- @vikaskashyap__
Email:- Vikas Kashyap
THANKS!