Temporal range: Middle Ordovician - Late Permian, 460–251.9 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
The defining characteristic of stylonurine eurypterids is that the sixth pair of legs remain normal limbs used for walking. Reconstructed leg of Parastylonurus.
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Chelicerata
Order:
†Eurypterida
Suborder:
†Stylonurina Diener, 1924
Clades
†Rhenopteroidea
†Stylonuroidea
†Kokomopteroidea
†Mycteropoidea
Incertae sedis
†Stylonuroides
Synonyms[1]
Woodwardopterina Kjellesvig-Waering, 1959
Hibbertopterina Størmer, 1974
Stylonurina is one of two suborders of eurypterids, a group of extinct arthropods commonly known as "sea scorpions". Members of the suborder are collectively and informally known as "stylonurine eurypterids" or "stylonurines". They are known from deposits primarily in Europe and North America, but also in Siberia.[2]
Compared to the other suborder, Eurypterina, the stylonurines were comparatively rare and retained their posterior prosomal appendages for walking. Despite their rarity, the stylonurines have the longest temporal range of the two suborders. The suborder contains some of the oldest known eurypterids, such as Brachyopterus, from the Middle Ordovician as well as the youngest known eurypterids, from the Late Permian. They remained rare throughout the Ordovician and Silurian, though the radiation of the mycteropoids (a group of large sweep-feeding forms) in the Late Devonian and Carboniferous is the last major radiation of the eurypterids before their extinction in the Permian.[3]
Though the Eurypterina contains several famous giant eurypterids such as Pterygotus and Jaekelopterus, the Stylonurina gave rise to large forms as well, several larger than a metre in length. The largest known stylonurine was Hibbertopterus scouleri, with a potential length of almost 2 meters.[4]
^James Lamsdell. "Systematic list of known eurypterid species". eurypterids.co.uk. Archived from the original on August 15, 2011. Retrieved January 13, 2011.
^James C. Lamsdell, Simon J. Braddy & O. Erik Tetlie (2010). "The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida)". Journal of Systematic Palaeontology. 8 (1): 49–61. doi:10.1080/14772011003603564. S2CID 85398946.
^Tetlie, O. E. (2008). "Hallipterus excelsior, a Stylonurid (Chelicerata: Eurypterida) from the Late Devonian Catskill Delta Complex, and Its Phylogenetic Position in the Hardieopteridae". Bulletin of the Peabody Museum of Natural History. 49: 19–99. doi:10.3374/0079-032X(2008)49[19:HEASCE]2.0.CO;2.
Stylonurina is one of two suborders of eurypterids, a group of extinct arthropods commonly known as "sea scorpions". Members of the suborder are collectively...
suborders, Eurypterina and Stylonurina, are distinguished primarily by the morphology of their final pair of appendages. In the Stylonurina, this appendage takes...
(2010) and shows the relationship of Megarachne within the suborder Stylonurina. Both known specimens of Megarachne have been recovered from the Bajo...
eurypterid suborders. They first appeared around the same time as the Stylonurina in the Middle Ordovician. The suborder faced a slow extinction during...
turn is one of four superfamilies classified as part of the suborder Stylonurina. Stylonuridae, which lived from Early Silurian to the Late Devonian,...
Rhenopteroidea, one of four superfamilies classified as part of the suborder Stylonurina. The family contains one of the earliest known eurypterids, Brachyopterus...
swimming paddles, a feature they shared with their entire suborder, the Stylonurina. Hibbertopterids fed using a method referred to as sweep-feeding, in...
"Redescription of Drepanopterus abonensis (Chelicerata: Eurypterida: Stylonurina) from the late Devonian of Portishead, UK". Palaeontology. 52 (5): 1113–1139...
the few surviving eurypterids were all walking forms of the suborder Stylonurina. Fossils of Adelophthalmus have been described from four continents;...
of the United States. List of eurypterids Kiaeropterus (Eurypterida; Stylonurina) recognized from the Silurian of the Pentland Hills O. ERIK TETLIE1,...
It is one of four superfamilies classified as part of the suborder Stylonurina. Stylonuroidea, which lived from the Early Silurian to the Late Devonian...
turn is one of four superfamilies classified as part of the suborder Stylonurina. Mycteroptids were sweep-feeding eurypterids known from the Late Carboniferous...
the specimen was found to share considerably more features with the Stylonurina than with Eurypterus (which is classified as part of the Eurypterina)...
Braddy & O. Erik Tetlie (2010). "The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida)". Journal of Systematic Palaeontology...
Drepanopteridae, now monotypic) would be subsequently included in the Stylonurina suborder for not possessing the podomere 7a. However, in 2014, Poschmann...
turn is one of four superfamilies classified as part of the suborder Stylonurina. Parastylonurids are stylonuroids with a posterior second order opisthosomal...
Braddy & O. Erik Tetlie (2010). "The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida)". Journal of Systematic Palaeontology...
Tetlie, O. Erik (2010-03-15). "The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida)". Journal of Systematic Palaeontology...
and heavy animal. It was the largest known eurypterid of the suborder Stylonurina, composed of those eurypterids that lacked swimming paddles. A carapace...
Braddy & O. Erik Tetlie (2010). "The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida)". Journal of Systematic Palaeontology...
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