Subphylum Chelicerata: Class Merostomata
Horseshoe crab is included in subclass
xiphosura
eurypterida
archnida
crustaecia
xiphosura
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Horseshoe crab has anA. open digestive system
B. open circulatory system
C. open reproductive system
D. operculum
Giant water scorpions are included in subclass
A. xiphosura
B. eurypterida
C. Arachnida
D. crustaecia
Last segment of abdomen or termination appendages in arthropods is called:
A. termination appendages
B. last part
C. anal part
D. telson
Number of living species of horseshoe crab is:
A. 2
B. 3
C. 5
D. 4
Abdomen of spider is known as:
A. middle segment
B. telson
C. opisthosoma
D. tegument
First pair of opisthosomal appendages that cover genital pore is called:
A. operculum
B. covering
C. lid
D. genital opercula
In appendages, except, covering genital pores, collectively called as:
A. lungs
B. book lungs
C. book gills
D. gills
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