110:
767:
678:). The pygidial axis is long and strongly tapered with 10 or more axial rings. The segmentation of the axis, however, is often effaced. The Weymouthiidae include forms with the rear of the glabella roundly expanded over the occipital ring or with a vertical spine, forms in which the occipital ring cannot be discerned because the glabella is expanded, and forms with a primitive occipital structure but with a greatly increased numbers of axial segments.
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Most taxa in this family are small (1β2 cm or 0.4β0.8 inches long), but this is large for the
Eodiscina. The glabella is wide at its base, normally parallel sided but may taper gently or be at its widest at half length. Glabellar furrows are mainly absent, but incomplete furrows may be present
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in some species and deeply impressed transglabellar furrows also occur. Free cheeks (or fixigenae) are normally confluent in front of glabella. The occipital ring may be simple or split into two lateral lobes (e. g. in
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734:., Part O, Treatise on Invertebrate Paleontology. Revised, Volume 1 β Trilobita β Introduction, Order Agnostida, Order Redlichiida. 1997
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KOBAYASHI T. 1943. Brief notes on the
Eodiscids 1, their classification with a description of a new species and a new variety,
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suborder is nested within it, particularly in the clade that further consists of the genera
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633:. The trend in the Weymouthiidae to reduce the occipital ring is carried furthest in
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658:). All Weymouthiidae lack eyes. The thorax consists of three rings when known (
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and the
Agnostina with the occipital ring divided into basal lobes.
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553:. They lived during the late Lower Cambrian and earliest Middle
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584:. The Weymouthiidae are all blind and lack free cheeks.
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871:iNaturalist
817:Wikispecies
751:18 December
672:Tannudiscus
668:Serrodiscus
656:Tannudiscus
652:Chelediscus
645:Description
639:Tannudiscus
635:Chelediscus
627:Tannudiscus
623:Chelediscus
605:Descendants
564:Eokochaspis
485:Tannudiscus
461:Serrodiscus
377:Meniscuchus
353:Litometopus
329:Cobboldites
317:Chelediscus
293:Bathydiscus
36:Eokochaspis
992:Categories
682:References
676:Weymouthia
664:Marocconus
551:trilobites
545:eodiscinid
497:Weymouthia
449:Semadiscus
401:Ninadiscus
389:Morocconus
305:Bolboparia
269:Acimetopus
200:Suborder:
165:Arthropoda
119:Morocconus
1003:Eodiscina
945:Agnostida
712:, Volume
615:Agnostina
593:Ancestors
574:Laurentia
560:Olenellus
257:Acidiscus
225:Kobayashi
207:Eodiscida
194:Agnostida
180: (?)
178:Trilobita
151:Kingdom:
145:Eukaryota
32:Olenellus
808:Q1464537
802:Wikidata
588:Taxonomy
582:Gondwana
578:Avalonia
555:Cambrian
548:agnostid
509:Synonyms
413:Oodiscus
245:Abakolia
213:Family:
161:Phylum:
155:Animalia
141:Domain:
902:5130524
863:3266622
850:9076009
538:extinct
536:are an
233:Genera
187:Order:
171:Class:
38:-zones)
915:154079
889:117048
876:333888
566:-zones
562:- and
541:family
281:Analox
34:- and
943:This
884:IRMNG
732:et al
949:stub
858:GBIF
753:2012
674:and
654:and
629:and
572:of
532:The
227:1943
43:Preκ
845:EoL
837:HW4
832:CoL
543:of
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518:β
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313:β
301:β
289:β
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265:β
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241:β
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204:β
191:β
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98:N
88:K
83:J
78:T
73:P
68:C
63:D
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