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BIOLOGY FORM 4. INVERTEBRATES ARTHROPODS. ARTHROPODS. Phylum TARDIGRADA Phylum PENTASTOMA Phylum ONYCHOPORA. What is Arthropods. Protostome Very diverse BUT share TWO characteristics anatomical features:

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Biology form 4

BIOLOGYFORM 4

INVERTEBRATES

ARTHROPODS


Arthropods
ARTHROPODS

  • Phylum TARDIGRADA

  • Phylum PENTASTOMA

  • Phylum ONYCHOPORA


What is arthropods
What is Arthropods

  • Protostome

  • Very diverse BUT share TWO characteristics anatomical features:

  • Pair of legs along all OR part of the body (served by ganglionic swellings on the latitudinal nerve cords

  • Pseudocoelomic body cavities (filled with blood – haemocoels)


Biology form 4
Cont.

  • Arthropod body plan:

    • Small anterior region (acron)

    • Equivalent posterior portion (telson) without legs

    • Number of intervening section (segments) with a pair of legs each

  • BUT non-leg-associated (respiratory, excretory) organs are not serially repeated


Phylum tardigrada e g water bears
Phylum TARDIGRADAe.g: water bears



What is phylum tardigrada
What is Phylum TARDIGRADA?

400 living species in 1 class

  • Characteristics[size: 0.05 – 1.2 mm]

  • Bilaterally symmetrical, minute, squat

  • Body more than 2 cell layer thick

  • Straight gut

  • Body monomeric –

    • four pair of short unjointed claw-bearing legs

    • Crawl by extrinsic muscle

    • Legs served by nerve ganglia

  • Well develop pseudocoelomic cavity => hydrostatic skeleton

  • Body wall with cuticle-covered epidermis without muscle

    • Non-chitinous cutilce moulted, bear spines or thickened into plates

    • Network of smooth muscle criss-cross the body




Biology form 4
Cont.

100 species placed in 1 class

  • Characteristics[size: 2 – 16 cm long]

  • Bilaterally symmetrical, flattened, vermiform

  • Body more than 2 cell layer thick

  • Straight gut

  • Body monomeric –

    • annular

    • 2 pair claw-bearing legs at anterior

    • OR two pair of claw

  • Pseudocoelomic hydrostatic skeleton

  • Body wall with cuticle-covered epidermis

    • Layer of striated circular and longitudinal muscle

    • Cuticle chitinous, porous and moulted





Phylum onychopora1
Phylum ONYCHOPORA

70 species placed in 1 Class, 1 Order

  • Characteristics[size: up to 15 cm long]

  • Bilaterally symmetrical, elongately and cylindrically vermiform

  • Body more than 2 cell layer thick

  • Straight gut bearing pair of mouthpart with 2 claw-like mandible

    • Fore- and hind-guts line with cuticle without digestive diverticula

  • Body 14-43 pairs of short unjointed fleshy legs along

    • Each leg: hollow evagination of body, padded terminally, with pairing claws and intrinsic muscle

    • Legs associated with a pair of heart ostia and excretory organ

  • Well developed haemocoelomic body hydrostatic skeleton with tubular heart but no other blood vessel



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