Plesiosaurus   CONYBEARE 1824b  

Type Species

dolichodeirus

Species recorded

Plesiosaurus affinis
Plesiosaurus arcuatus
Plesiosaurus australis
Plesiosaurus australis
Plesiosaurus australis
Plesiosaurus balticus
Plesiosaurus baurthicus
Plesiosaurus bavaricus
Plesiosaurus bernardi
Plesiosaurus bernardi
Plesiosaurus bitractensis
Plesiosaurus brachistospondylus
Plesiosaurus brachycephalus
Plesiosaurus brachypterygius
Plesiosaurus brevifemur
Plesiosaurus brevis
Plesiosaurus capensis
Plesiosaurus carinatus
Plesiosaurus cf. P. dolichodeirus
Plesiosaurus cf. P.guilelmiimperoatoris
Plesiosaurus changduensis
Plesiosaurus chilensis
Plesiosaurus compressus
Plesiosaurus constrictus
Plesiosaurus constrictus
Plesiosaurus continiuus
Plesiosaurus conybeari
Plesiosaurus costatus
Plesiosaurus crassicostatus
Plesiosaurus crassicostatus
Plesiosaurus crassicostatus
Plesiosaurus cycnodeirus
Plesiosaurus degenhardti
Plesiosaurus depressicostatus
Plesiosaurus depressus
Plesiosaurus dewalqui
Plesiosaurus dibothricus
Plesiosaurus dibothrius
Plesiosaurus doedicomus
Plesiosaurus dolichodeirus
Plesiosaurus dubious
Plesiosaurus dubius
Plesiosaurus ellipsospondylus
Plesiosaurus erraticus
Plesiosaurus etheridgii
Plesiosaurus eurymerus
Plesiosaurus euryspondylus
Plesiosaurus fahrenkohlii
Plesiosaurus gouldii
Plesiosaurus gouldii
Plesiosaurus grandipennis
Plesiosaurus guilelmiimperatoris
Plesiosaurus gulo
Plesiosaurus gurgitis
Plesiosaurus haasti
Plesiosaurus hawkinsii
Plesiosaurus helmersenii
Plesiosaurus hesternus
Plesiosaurus hexagonalis
Plesiosaurus holmesi
Plesiosaurus holmesi
Plesiosaurus holmesii
Plesiosaurus homospondylus
Plesiosaurus hoodi
Plesiosaurus hoodii
Plesiosaurus houzeaui
Plesiosaurus imperatorisguilelmi
Plesiosaurus infraplanus
Plesiosaurus jenensis
Plesiosaurus keuperinus
Plesiosaurus laticeps
Plesiosaurus latispinus
Plesiosaurus leptopleuron
Plesiosaurus levis
Plesiosaurus limnophilus
Plesiosaurus mackayi
Plesiosaurus macrocephalus
Plesiosaurus macromus
Plesiosaurus macropterus
Plesiosaurus macrospondylus
Plesiosaurus manselli
Plesiosaurus mauritanicus
Plesiosaurus megacephalus
Plesiosaurus megapleuron
Plesiosaurus megdeirus
Plesiosaurus mexicanus
Plesiosaurus microdeirus
Plesiosaurus morinicinus
Plesiosaurus mudgei
Plesiosaurus mudgei
Plesiosaurus neocomiensis
Plesiosaurus neogaeus
Plesiosaurus nordmanni
Plesiosaurus nothosauroides
Plesiosaurus occiduus
Plesiosaurus ophiodeirus
Plesiosaurus pachyomus
Plesiosaurus pectopleuron
Plesiosaurus pentagonus
Plesiosaurus phillipsi
Plesiosaurus plainspondylus
Plesiosaurus planus
Plesiosaurus planus trigonalis
Plesiosaurus platydeirus
Plesiosaurus plicatus
Plesiosaurus poecilospondylus
Plesiosaurus posiondoniae
Plesiosaurus profundus
Plesiosaurus propinquus
Plesiosaurus robustus
Plesiosaurus rugosus
Plesiosaurus shirleyensis
Plesiosaurus simplex
Plesiosaurus simplex
Plesiosaurus simpsoni
Plesiosaurus simthii
Plesiosaurus sp.
Plesiosaurus sp.
Plesiosaurus subconcavus
Plesiosaurus subdepressus
Plesiosaurus subplanus
Plesiosaurus subtrigonus
Plesiosaurus suevicus
Plesiosaurus sutherlandi
Plesiosaurus sutherlandi
Plesiosaurus tournemirensis
Plesiosaurus traversi
Plesiosaurus trigonus
Plesiosaurus tritarsostinus
Plesiosaurus truncatus
Plesiosaurus validus
Plesiosaurus winspitensis
Plesiosaurus zetlandicus

Etymology

Greek, plesios, 'near, approaching', Greek, sauros, 'lizard': Near-to- lizard.

Diagnosis    STORRS 1997

Moderately sized plesiosaur up to 3.5 rn in length, differing from other genera by its small head with relatively short antorbital and temporal regions; subcircular supratemporal fenestrae; narrow temporal bar but only weak cheek emargination; broad yet distally pointed rostrum; prominent pineal foramen; relatively narrow and sharp sagittal crest; non spatulate mandibular symphysis; homodont dentition lacking carinae; elongate neck comprising approximately 40 cervical vertebrae; cervical rib heads pierced by elongate longitudinal forarnen resulting in distinctly paired facets on the vertebral centrum; slightly to markedly rugose edges to the articular faces of virtually all mature vertebral centra; prominent anterior “U" notch in clavicular arch, stout longitudinal pectoral bar between ovate fenestrae; slender dorsal blade of scapula; coracoids of moderate breadth; acute posterolateral expansion to the coracoid plate in adult condition humerus with prominent shaft curvature and marked posterodistal expansion but weak anterodistal corner; robust, pillar-like anterior epipodials offset to extend distally beyond posterior epipodials; broad, crescentic posterior epipodials; large, lozenge-shaped spatia interossea; pubis slightly longer anteroposteriorly than ischium; generally convex anterior margin of pubis; small, ovate to circular, puboischiatic fenestrae with unfused longitudinal pelvic bar; ihum with little twist to shaft; very elongate yet narrow limbs; forelimbs slightly longer than hindlimbs in adult; up to nine phalanges in the middle digit; digit IV the longest

Genus List

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