Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 26 views

    Penaeus

    Uploaded by

    Soothing Melody
    This document describes the anatomy and physiology of marine prawns. Key points include: 1) Marine prawns have a segmented body divided into a cephalothorax and abdomen, with 19 pairs of appendages and an exoskeleton made of chitin and calcium. 2) They have an open circulatory system with a dorsal heart, gills for respiration, and specialized organs like antennary and green glands for excretion. 3) Their digestive system includes a stomodaeum, mesodaeum, and proctodaeum for ingestion, digestion with a hepatopancreas, and waste elimination through the rectum and anus

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Penaeus

    Uploaded by

    Soothing Melody
    26 views37 pages
    This document describes the anatomy and physiology of marine prawns. Key points include: 1) Marine prawns have a segmented body divided into a cephalothorax and abdomen, with 19 pairs of appendages and an exoskeleton made of chitin and calcium. 2) They have an open circulatory system with a dorsal heart, gills for respiration, and specialized organs like antennary and green glands for excretion. 3) Their digestive system includes a stomodaeum, mesodaeum, and proctodaeum for ingestion, digestion with a hepatopancreas, and waste elimination through the rectum and anus

    Original Description:

    arthropode prawn

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This document describes the anatomy and physiology of marine prawns. Key points include: 1) Marine prawns have a segmented body divided into a cephalothorax and abdomen, with 19 pairs of appendages and an exoskeleton made of chitin and calcium. 2) They have an open circulatory system with a dorsal heart, gills for respiration, and specialized organs like antennary and green glands for excretion. 3) Their digestive system includes a stomodaeum, mesodaeum, and proctodaeum for ingestion, digestion with a hepatopancreas, and waste elimination through the rectum and anus

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    26 views37 pages

    Penaeus

    Uploaded by

    Soothing Melody
    This document describes the anatomy and physiology of marine prawns. Key points include: 1) Marine prawns have a segmented body divided into a cephalothorax and abdomen, with 19 pairs of appendages and an exoskeleton made of chitin and calcium. 2) They have an open circulatory system with a dorsal heart, gills for respiration, and specialized organs like antennary and green glands for excretion. 3) Their digestive system includes a stomodaeum, mesodaeum, and proctodaeum for ingestion, digestion with a hepatopancreas, and waste elimination through the rectum and anus

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 37

    Jointed-footed animals

    Bilaterally symmetrical

    Metamerically segmented

    Coelomate, Schizocoelic formation

    Protostomes

    Cuticular exoskeleton

    Segmental appendages with no locomotor cilia


    Tagmosis & cephalization

    Periodic moulting

    Paired, jointed and segmental appendages

    Striped muscles

    Peri-visceral haemocoel & reduced coelom

    Open circulatory system with dorsal heart

    Branchiae, tracheae, book gills and book lungs

    Malpighian tubules & green glands

    Nervous system
    Marine prawn

    Segmented body
    Body divided into cephalothorax (13= 5cephalic + 8thoracic) & abdomen (6)
    Terminal conical process- telson
    EXOSKELETON = chitin + calcium

    Protects body and provide attachment for muscles.

    Sclerites= terga (dorsal) + sterna (ventral)

    Extension of terga- pleuron

    Pleuron – (epimeron) – appendages

    Carapace- fusion 0f 13 cephalothoracic terga. Rostrum.

    Compound eyes

    Females- sternum of last thoracic segment has cup like outgrowth called

    thelycum
    APPENDAGES
    (19 pairs)

    Cephalic Thoracic Abdominal


    Appendages Appendages Appendages
    (5 pairs) (8 pairs) (6 pairs)
    Appendages are:

    Segmented

    Biramous- because they have 2 processes arising from the protopodite

    outer process- exopodite (unsegmented in all appendages)

    Inner process- endopodite (either unsegmented or segmented)

    Protopodite (base of appendage) has 2 segments- coxa & basis

    Coxa- basal segment-remains attached o body wall

    Basis- terminal segment- bears exopodite & endopodite


    CEPHALIC APPENDAGES (5 PAIRS)

    ✓ Antennules
    Tactile structures
    ✓ Antennae

    ✓ Mandibles Masticatory structures

    ✓ First maxillae
    Feeding jaws
    ✓ Second maxillae
    ✓ 1st pair of cephalic appendages
    ✓ Protopodite (3 segments- Pre-coxa, coxa, basis)
    +
    Flagellar process (2)
    ✓ Pre- coxa- concave side has compound eyes & statocyst
    ✓ 2nd pair of cephalic appendages
    ✓ Protopodite (2 segments- coxa, basis)
    +
    Filamentar process (2)
    ✓ Coxa carries excretory organ- green / antennary gland
    ✓ Basis bears an expanded-unsegmented exopodite &
    many jointed endopodite (3 segments)
    ✓ Uniramous appendages
    ✓ Cutting
    ✓ On each side of mouth
    ✓ Tooth, calcified base and two jointed palp

    ✓ Small, thin leaf like


    ✓ Uniramous appendages
    ✓ Protopodite- flat lobular coxa + basis
    +
    Endopodite- flat leaf like
    ✓ No exopodite
    ✓ Gnathobases
    ✓ Pushing food into mouth
    ✓ Last pair of cephalic appendages
    ✓ Thin leaf like and biramous
    ✓ Protopodite- 4 lobed, bilobed coxa + bilobed basis
    exopodite- flat & unsegmented- broad & fan like. Scaphognathite / baler
    endopodite- flat & unsegmented- small
    ✓ Feeding & respiratory organ
    THORACIC APPENDAGES (8 PAIRS)

    Maxillipeds- feeding Peraeopods- walking


    (first 3 pairs of appendages) Last 5 pairs of appendages
    ✓ Biramous
    ✓ 2 segmented protopodite (coxa + basis)
    ✓ 5 segmented endopodite- ischium, merus, carpus, propodus,
    dactylus. (chelae??)
    ▪ Chelipeds – chelate- non chelate appendages
    ▪ function
    ✓ Unsegmented exopodite
    ABDOMINAL APPENDAGES (6 PAIRS)
    DIGESTIVE SYSTEM

    Alimentary canal Digestive gland- heptopancreas


    • Stomodaeum: Mouth, Buccal cavity, • Bilobed
    oesophagus, stomach (intima?) • Hepato-pancreatic duct
    • Mesodaeum: intestine • Functions
    • Procodaeum: rectum, anus (intima?)
    ✓ Mouth: labrum- mandibles- labium (paragnathae)
    ✓ Buccal cavity- oesophagus
    ✓ Stomach: cardiac (internal masticatory apparatus)+ pyloric (filtering
    apparatus)

    ✓ Intestine- rectum- anus (sphincter)


    ✓ Omnivores, extracellular digestion
    ✓ Chelipeds collects food
    ✓ 2nd maxillae push food into mouth
    ✓ Mandibles masticate
    ✓ Maxilla & Maxillipeds push to oesophagus(peristalsis)
    ✓ Stomach – churning & internal mastication
    ✓ Absorption – hepato-pancreas & intestine
    ✓ Storage as glycogen & fats
    ✓ Gills(18 + 18), epipodites, vascular lining of branchiostegites.
    ✓ Gill chamber, gill axis, gill lamellae, gill filaments
    ✓ Dendrobranch
    ✓ Ventilation of gills
    ✓ Setose hair function
    ✓ Open circulatory system- Sinuses & lacunae
    ✓ Arteries, blood, heart present, veins & capillaries absent
    ✓ Hb & RBC absent. HEAMOCYANIN

    Heart → Arteries → sinuses → Lacunae → ventral Sinuses

    →
    →

    Pericardial sinus  Eff. Branchial  gills  Aff. Branchial


    channels channels
    ✓ Pair of antennary glands
    ✓ 3 parts: end sac, labyrinth, bladder

    ✓ Green glands- excretion & osmoregulation


    ✓ Ultra-filtration & selective reabsorption
    ✓ Excretory products

    You might also like