Transcript Subphylum Mandibulata (ppt)

Subphylum Mandibulata
Class Crustacea
1
Subphylum Mandibulata
Subphylum Mandibulata
All members of this group bear mandibles
on the third head segment that are
modified for feeding
 Taxonomic Summary

–
Phylum Arthropoda
 Subphylum
–
–
2
–
Mandibulata
Class Myriapoda
Class Insecta
Class Crustacea
Subphylum Mandibulata
Class Crustacea
3

Defining
Characteristics

Crustacean
Characteristics
Subphylum Mandibulata
Crustacean Segments &
Appendages


4
The crustacean head consists of 5 segments fused tightly together
These segments bear five paired appendages
– 2 pairs of antennae
– 1 pair of mandibles
– 2 pairs of maxillae
Subphylum Mandibulata
Crustacean Segments &
Appendages


5
Following segment is the thorax, which can have a variable amount
of appendages
The abdomen may or may not have appendages
Subphylum Mandibulata
Taxonomic Summary

Class Crustacea
–
–
–
Subclass Cirripedia
Subclass Copepoda
Subclass Malacostraca





6
Order Stomatopoda
Order Euphausiacea
Order Isopoda
Order Amphipoda
Order Decapoda
Subphylum Mandibulata
Subclass Cirripedia

Defining
Characteristics
–
–
7
All species are
highly modified
for attachment to
hard substrates
Thoracic limbs
are modified as
filtering cirri
Subphylum Mandibulata
Haven’t I Seen You Before

Thought to be molluscs by early naturalists
–

8
Possess a shell that is secreted by “mantle tissue”
What makes barnacles members of the phylum
Arthropoda?
Subphylum Mandibulata
Barnacle Anatomy

Have a reduced head and 6
segmented thorax
–
9
Thorax - six pairs of feather
like appendages which are
used for suspension
feeding
Subphylum Mandibulata
Is that a roll of quarters, or are you
just happy to see me?
10
Subphylum Mandibulata
Subclass Copepoda

Defining
Characteristics
–

11
Loss of abdominal
appendages
Abundant in the
plankton and benthic
communities; but due
to small size escape
notice
Harpacticoid
Subphylum Mandibulata
Cows of the Sea
Calanoid
12
Cyclopoid
Subphylum Mandibulata
Subclass Malacostraca


13
Defining Characteristics
–
The head has 5 fused segments, thoracic with 8
segments, abdomen with 6-7 segments plus a
telson
–
Appendages on the 6th abdominal segment are
flattened to form uropods
Contains nearly 75% of all crustaceans
Subphylum Mandibulata
Malacostraca Characteristics
14
Subphylum Mandibulata
Order Stomatopoda
15
Subphylum Mandibulata
Order Euphausiacea
Krill, a small group of only 85 species
 Have 8 pairs of walking feet instead of 5
like most decapods

16
Subphylum Mandibulata
Order Isopoda
17
Subphylum Mandibulata
Order Amphipoda
18
Subphylum Mandibulata