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Extinct genus of arthropods From Wikipedia, the free encyclopedia
Chasmataspis is a genus of chasmataspidid, a group of extinct aquatic chelicerate arthropods.[1][2] It was found in the Early Ordovician deposits of Tennessee, United States.[3]
Chasmataspis Temporal range: Early Ordovician | |
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Holotype specimen | |
Life reconstruction of C. laurencii | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Subphylum: | Chelicerata |
Clade: | Dekatriata |
Order: | †Chasmataspidida |
Family: | †Chasmataspididae Caster & Brooks, 1956 |
Genus: | †Chasmataspis Caster & Brooks, 1956 |
Type species | |
†Chasmataspis laurencii Caster & Brooks, 1999 |
Just like other chasmataspidids, the body of Chasmataspis compose of a prosoma and a 13-segmented opisthosoma, with the latter subdivided into a 4-segmented preabdomen and a 9-segmented postabdomen.[4] Dorsal to the carapace were pairs of ridges, lateral eyes and median ocelli.[4] Chasmataspis characterized by a semicircular carapace (prosomal dorsal shield) with pointed genal spines and preabdomen with fused body segments.[4] Rows of tubercles and spines run through the axial and lateral regions of opisthosoma.[4] The body terminated with a spine-like telson.[4]
There is no body fossils of Chasmataspis with unambiguous appendages being discovered.[4] The only evidence were 2 specimens of disarticulated, claw-bearing appendages discovered from the same stratum which may represent the prosomal appendage (possibly appendage VI[3]) of Chasmastaspis.[4]
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