EUPAGURUS (HERMIT CRAB)

CLASSIFICATION OF EUPAGURUS (HERMIT CRAB)

KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)

PHYLUM :- ARTHROPODA (Jointed appendages.)

SUB-PHYLUM:- CRUSTACEA (Exoskeleton thick, antennae 2 pairs, jaws 3 pairs.)

CLASS :- MALACOSTRACA (Free-living Crustacea with compound eyes, biramous antennules, mandibles, 8 thoracic and 6 abdominal segments having appendages.)

ORDER :- DECAPODA (Carapace present; first three thoracic limbs from maxillipedes.)

FAMILY :- PAGURIDAE (Abdomen flexed.)

GENUS :- Eupagurus (The Hermit crab)

GEOGRAPHICAL DISTRIBUTION

  • Cosmopolitan. It is found from Alaska to lower California and Main to Florida. At Mumbai and Goa beaches. Eupagurus is a very favourite sea-shore animal.

HABIT AND HABITAT

  • Eupagurus leads a commensal life. It occupies a gastropod shell and it adjusts in the coils of shell with appendages protruding.

EUPAGURUS (HERMIT CRAB) DIAGRAM ARTHROPODA

GENERAL CHARACTERSTICS OF EUPAGURUS (HERMIT CRAB)

  • Commonly known as Hermit-crab. 
  • Eupagurus (Hermit crab) is a peculiar crustacean having extreme modifications in order to adjust in the coils of molluscan shells. Modifications are as under : 
    1. Body is reduced in varying degree and asymmetrical but shows usual divisions into head, thorax and abdomen.
    2. Carapace reduced and not fused at the sides with epistome. It covers head. Rostrum absent.
    3. Head contains antennules, antennae and stalked eyes. Thoracic appendages protrude through the opening of the shell. First thoracic leg is chelate and rest reduced. Right chelate leg is very large as compared to left and it acts as lid or operculum.
    4. Abdomen is asymmetrical, soft fleshy, elongated and twisted or bent under the thorax.
    5. Abdominal appendages of the right side absent while those of left side reduced. Sixth left abdominal appendages (uropod) adapted for holding the body in hollow objects. 
    6. Seventh and eighth thoracic appendages are reduced and remain inside the mollusc shell. 
    7. Uropods are hooked and notched in the shell.
EUPAGURUS (HERMIT CRAB) DIAGRAM ARTHROPODA

SPECIAL FEATURES

  • Hermit crab inside the gastropod shell and sea anemone over the shell associate themselves to lead a commensal life. The hermit-crab by its appendages takes sea anemone to varied places for food and in tum sea-anemone protects itself as well as the crab by its stinging cells. When the growth of the body demands, the Eupagurus selects a new large shell and deserts the old one. There is no metabolic dependency in above association.

IDENTIFICATION

  • The animal has protruding thoracic appendages, from mollusc shell and all above characters hence it is Hermit-crab (Eupagurus).

EUPAGURUS (HERMIT CRAB) DIAGRAM ARTHROPODA
EUPAGURUS (HERMIT CRAB) DIAGRAM ARTHROPODA
OUR POSTS
  • WHALE (BALAENOPTERA)​WHALE (BALAENOPTERA)​
    WHALE (BALAENOPTERA)​ CLASSIFICATION OF WHALE (BALAENOPTERA)​ PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with ...READ MORE
  • ERINACEUS : HEDGEHOGHEDGEHOG (ERINACEUS)
    HEDGEHOG (ERINACEUS) CLASSIFICATION OF ERINACEUS : HEDGEHOG PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with ...READ MORE
  • ZEBRAZEBRA
    ZEBRA CLASSIFICATION OF ZEBRA PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present ) Group :- CRANIATA ( Definite head. Cranium with brain present ) ...READ MORE
  • MANGOOSE : HERPESTESMANGOOSE : HERPESTES
    MANGOOSE : HERPESTES CLASSIFICATION OF MANGOOSE : HERPESTES PHYLUM :-  CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with ...READ MORE
  • WHY ELEPHANTS NEVER FORGETS ?WHY ELEPHANTS NEVER FORGETS ?
    WHY ELEPHANTS NEVER FORGETS ? It’s a not unexpected saying that elephants always remember, and that is why these great creatures are more than just monster strolling on our planet earth. The ...READ MORE
  • SEAL DIAGRAM : PHOCASEAL : PHOCA
    SEAL : PHOCA CLASSIFICATION OF SEAL (PHOCA) PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with brain present) ...READ MORE
  • HERDMANIA SLIDESHERDMANIA SLIDES
    HERDMANIA SLIDES Herdmania : Metamorphosis : Tadpole Larva Larva of Herdmania is called as tadpole larva. After hatching it leads a free-swimming life for 90-180 seconds and then undergoes ...READ MORE
  • AMMOCOETE LARVA
    CYCLOSTOMATA SLIDES Lamprey : Ammocoete : Larva Whole Mount COMMENTS :- It is one of the stages in the development of lamprey. Egg develops into ammocoete larva, which is a tiny transparent creature ...READ MORE
  • VERTEBRAL COLUMNVERTEBRAL COLUMN
    Vertebral Column Notochord In all chordate embryos, the first axial endoskeleton to appear is a slender, stiff, unsegmented, gelatinous rod, the notochord. It is present below the nerve cord and ...READ MORE
  • SKULL BONESKULL BONES
    SKULL BONES SCOLIODON : SKULL BONES Skull consists of :- (A) Cranium and sense capsules,  (B) Visceral skeleton. 1. Cranium and sense capsules Made up of a single piece of cartilage and divisible ...READ MORE

Leave a Reply