The Earthlife Web - Horseshoe Crabs: Class Merostomata.
Merostomata definition is - a class or other category of chelicerate arthropods including the Xiphosura and Eurypterida and sometimes made a subdivision of Arachnida.
CYCLOSTOMATA-CLASSIFICATION classification of cyclostomata. The class Cyclostomata is divided into two orders: 1) Petromyzonia and 2) Myxinoidea. Order 1. Pefromyzonia. 1)Lampreys are included In this order. 2) The buccal funnel is suctorial and shows horny teeth. 3) The mouth is present in the buccal funnel. 4) The nasal sac is dorsal. It has no connection with the pharynx. 5) Eyes are.
Class Merostomata (horseshoe crabs) Major Attributes: Separate sexes (gonorchoristic) exhibit pseudocopulation during mating. External fertilization. Juvenile stage is a small version of the adult. Thick, horseshoe shaped carapace covers the large prosoma. Bears a long post-anal, caudal spine. Book gills located behind the sixth pair of abdominal appendages representing the respiratory.
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Define class Merostomata. class Merostomata synonyms, class Merostomata pronunciation, class Merostomata translation, English dictionary definition of class Merostomata. Noun 1. class Merostomata - used in some classifications; includes the orders Xiphosura and Eurypterida Merostomata arthropod - invertebrate having jointed. Class Merostomata - definition of class Merostomata by The Free.
Xiphosurans are an order o arthropods relatit tae arachnids, or, accordin tae ane recent study, actually arachnids. References.
Merostomata is a name given to the now extinct sea scorpions (Eurypterida) and the horseshoe crabs (().There are four known species of horsehoe crabs still alive. James Dwight Dana introduced the name to refer to the horseshoe crabs only. Henry Woodward later extended it to refer to both taxa.