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Subphylum Chelicerata. Class Merostomata Class Pycnogonida. Subphylum Chelicerata. Defining characteristics Absence of antennae Contains three classes, most of the animals are terrestrial and freshwater Marine species are horseshoe crabs, sea spiders, and mites. Chelicerate Segmentation.

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subphylum chelicerata

Subphylum Chelicerata

Class Merostomata

Class Pycnogonida

Subphylum Chelicerata

subphylum chelicerata2
Subphylum Chelicerata
  • Defining characteristics
    • Absence of antennae
  • Contains three classes, most of the animals are terrestrial and freshwater
  • Marine species are horseshoe crabs, sea spiders, and mites

Subphylum Chelicerata

chelicerate segmentation
Chelicerate Segmentation
  • Cephalothorax –usually has 6 pairs of appendages
    • First pair – chelicerae
    • Second pair – pedipalps
    • Both function as mouthparts
    • The rest are walking legs

Subphylum Chelicerata

taxonomic summary
Taxonomic Summary
  • Phylum Arthropoda
    • Subphylum Chelicerata
      • Class Merostomata
      • Class Pycnogonida

Subphylum Chelicerata

class merostomata
Class Merostomata
  • Defining characteristics
    • Appendages on the abdomen are flattened and modified for gas exchange as “book gills”
    • Terminal portion of body drawn out into an elongated spike
  • Only 4 living species; the horseshoe crabs

Subphylum Chelicerata

horseshoe crab habits
Horseshoe Crab Habits
  • The cephalothorax and abdomen are covered by a hard non-jointed carapace

Subphylum Chelicerata

merostomata appendages
Merostomata Appendages
  • Possess an anterior chelicerae and 5 pairs of walking legs
  • In males the first pair of walking appendages are modified for grasping the female during reproduction
  • All the legs (except the last pair) bear pinchers for manipulating food
  • Walking legs bear gnathobases on basal part of legs, which aid in food manipulation

Subphylum Chelicerata

respiration
Respiration
  • The abdomen bears the book gills and is endowed with blood
  • The blood or components of it are used in pharmaceutical research

Subphylum Chelicerata

reproduction
Reproduction

Subphylum Chelicerata

class pycnogonida
Class Pycnogonida
  • Defining characteristics
    • Body is not divided into distinct regions
    • Unique proboscis at the anterior end, with an opening at its tip
  • Includes the sea spiders, several of which are common in our area
  • Feed on soft bodied invertebrates, hydroids, bryozoan colonies, and sponges

Subphylum Chelicerata

sea spiders
Sea Spiders
  • Have a long proboscis for feeding and a digestive tract with gonads extending into the walking legs
  • Difficult to discern the cephalothorax, and abdomen
  • Anterior appendages may bear cheliceras that grasp pieces food

Subphylum Chelicerata

sea spiders13
Sea Spiders
  • Ovigers – structures used by males to carry eggs on the body
    • When eggs are mature they are deposited in a hydroid colony

Subphylum Chelicerata