Classification
Within iNaturalist.org

All Names

  • English
    • horseshoe crabs and sea scorpions
  • Spanish
    • Cangrejos cacerola
  • Scientific Names
    • Merostomata

Extras

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Creative Commons Flickr Photos Tagged "Merostomata."
Invite photos to iNat » View all photos tagged "Merostomata" on Flickr »

Recent observations

Photos / Sounds

No photos or sounds

What

horseshoe crabs Order Xiphosurida

Observer

tabristabarsi

Date

April 17, 2014

Place

Padang (Google, OSM)

Photos / Sounds

Square

What

Horseshoe Crab Limulus polyphemus

Observer

cpope

Date

January 21, 2012

Description

Found on the shore in Kiawah, South Carolina

Photos / Sounds

13551201054_77c6dc1522_s

What

Horseshoe Crab Limulus polyphemus

Date

November 23, 2010 09:45 AM EST

Description

male Atlantic Horseshoe Crab (Limulus polyphemus) on the beach at Assateague Island National Seashore, MD, 11/23/10; note the book gills on the opisthosoma [abdomen] between the tail and legs. The mouth is the dark opening between the rear legs. The chelicerae are the two small pincer-appendages between the front legs. The front legs are different from the next three pairs, indicating a male. Not a real crab, or even a crustacean, it's more closely related to spiders and arachnids, but has its own Class, the Merostomata. The genus dates to the Triassic, roughly 230 mya +/- 18 m (think early Age of Dinosaurs). Photo number: D071815 (uncropped, but resolution is reduced for faster web use; 10 MP original available by request).

Photos / Sounds

Square

What

Horseshoe Crab Limulus polyphemus

Observer

botanygirl

Date

January 20, 2014 10:47 AM EST

Photos / Sounds

What

Horseshoe Crab Limulus polyphemus

Observer

vfazio

Date

January 3, 2014

Photos / Sounds

What

Horseshoe Crab Limulus polyphemus

Observer

guarwicko

Date

January 1, 2014 03:11 PM CST

Photos / Sounds

What

Horseshoe Crab Limulus polyphemus

Observer

gyrrlfalcon

Date

December 31, 2013

Description

Deceased

Photos / Sounds

What

Horseshoe Crab Limulus polyphemus

Observer

vfazio

Date

December 25, 2013

Photos / Sounds

What

Horseshoe Crab Limulus polyphemus

Observer

kucycads

Date

August 31, 2003

Description

dead

Photos / Sounds

What

Horseshoe Crab Limulus polyphemus

Observer

chelseavmarshall

Date

the past

Photos / Sounds

What

Horseshoe Crab Limulus polyphemus

Observer

justjohn

Date

November 27, 2013

Place

(Somewhere...)

Description

Outer banks, NC

Tags

Photos / Sounds

Observer

jimsteamer

Date

January 6, 2011

Description

Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Merostomata
Order: Xiphosura
Family: Limulidae
Genus: Limulus

View all observations

Description from Wikipedia

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

No range data available.