Subphylum Chelicerata: Class Merostomata
Horseshoe crab has an
open digestive system
open circulatory system
open reproductive system
operculum
open circulatory system
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Giant water scorpions are included in subclassA. 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
Horseshoe crab is included in subclass
A. xiphosura
B. eurypterida
C. archnida
D. crustaecia
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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