Definitions for merostomata
meros·tom·a·ta

Princeton's WordNetRate this definition:0.0 / 0 votes

1. Merostomata, class Merostomatanoun

   used in some classifications; includes the orders Xiphosura and Eurypterida

WikipediaRate this definition:0.0 / 0 votes

1. merostomata

   Xiphosura () is an order of arthropods related to arachnids. They are more commonly known as horseshoe crabs (a name applied more specifically to the only extant family, Limulidae). They first appeared in the Hirnantian (Late Ordovician). Currently, there are only four living species. Xiphosura contains one suborder, Xiphosurida, and several stem-genera. The group has hardly changed in appearance in hundreds of millions of years; the modern horseshoe crabs look almost identical to prehistoric genera and are considered to be living fossils. The most notable difference between ancient and modern forms is that the abdominal segments in present species are fused into a single unit in adults. Xiphosura were historically placed in the class Merostomata, although this term was intended to encompass also the eurypterids, whence it denoted what is now known to be an unnatural (paraphyletic) group (although this is a grouping recovered in some recent cladistic analyses). Although the name Merostomata is still seen in textbooks, without reference to the Eurypterida, some have urged that this usage should be discouraged. The Merostomata label originally did not include Eurypterida, although they were added in as a better understanding of the extinct group evolved. Now Eurypterida is classified within Sclerophorata together with the arachnids, and therefore, Merostomata is now a synonym of Xiphosura. One recent study places Xiphosura within the Arachnida as the sister group of Ricinulei.

ChatGPTRate this definition:0.0 / 0 votes

1. merostomata

   Merostomata is a subgroup of arthropods that includes horseshoe crabs and the extinct sea scorpions. They are characterized by having two main body parts (a prosoma and an opisthosoma), with the prosoma covered by a carapace and bearing all the appendages, and the opisthosoma divided into a front and rear part. They also have a long, sharp, stiff tail spine.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Merostomata

   a class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus

2. Etymology: [NL., fr. Gr. me`ros thigh + , -, mouth.]

WikidataRate this definition:0.0 / 0 votes

1. Merostomata

   Merostomata is the name given to a grouping of the extinct Eurypterida and the Xiphosura. The term was originally used by James Dwight Dana to refer to Xiphosura only, but was emended by Henry Woodward to cover both groups.

Matched Categories

1. • Arthropod

How to pronounce merostomata?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

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   Karen

   Australian

   Hayley

   Australian

   Natasha

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   Indian

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   Neerja

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   South African

How to say merostomata in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of merostomata in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of merostomata in Pythagorean Numerology is: 5

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=merostomata
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Merostomata
3. ^ ChatGPT
   https://chat.openai.com
4. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/merostomata
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=merostomata