Hebediscidae: Difference between revisions

Hebediscidae; Temporal range: Lower Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
	Tchernyshevioides ninae
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita (?)
Order:	†Agnostida
Suborder:	†Eodiscina
Superfamily:	†Eodiscoidea
Family:	†Hebediscidae; Kobayashi, 1944
Genera
	Delgadella; Dicerodiscus; Hebediscus; Luvsanodiscus; Limbadiscus; Neopagetina; Parapagetia; Tchernyshevioides;
Synonyms
	Delgadoiinae; Pagetiellinae; Dicerodiscinae;

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Hebediscidae is a family of trilobites belonging to the order Agnostida that lived during the Lower Cambrian (Atdabanian to Toyonian). They are small or very small, and have a thorax of two or three segments. The Hebediscidae include five genera (see box).

Taxonomy

The Hebediscidae probably descended from the Tsunyidiscidae and gave rise to the Weymouthiidae.^[2]

Description

Like all Agnostida, the Hebediscidae are diminutive and the headshield (or cephalon) and tailshield (or pygidium) are of approximately the same size (or isopygous) and outline. In the Hebediscidae, the central raised area of the cephalon (or glabella) is wide at its rear end, has parallel sides or tapers forward, and without transverse glabellar furrows, although the lobes may be apparent if they are expanded. A three segment thorax is known in Hebediscus, Delgadella and Tchernyshevioides. The pygidium has a wide, tapering axis of more than four segments.^[1]

References

^ ^a ^b WHITTINGTON, H. B. (1997). Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. Vol. Part O, Revised. pp. 390–392.
^ JELL, P. A. (1975). "Australian Middle Cambrian Eodiscoids with a review of the superfamily". Palaeontographica Abteilung A. 150: 1–97. cited in WHITTINGTON, H. B. (1997). Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. Vol. Part O, Revised. pp. 348–349.

This Agnostida-related article is a stub. You can help Wikipedia by expanding it.

[Treatise-1] WHITTINGTON, H. B. (1997). Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. Vol. Part O, Revised. pp. 390–392.

[2] JELL, P. A. (1975). "Australian Middle Cambrian Eodiscoids with a review of the superfamily". Palaeontographica Abteilung A. 150: 1–97. cited in WHITTINGTON, H. B. (1997). Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. Vol. Part O, Revised. pp. 348–349.

[1]

[2]

@@ Line 1: / Line 1: @@
+{{Automatic taxobox
-{{Taxobox
-| name = '''Hebediscidae'''
 | fossil_range = {{Geological range|520|514|Lower Cambrian}}
 | image = Tchernyshevioides drawing white.png
-| image_width = 100px
+| image_upright = 0.8
 | image_caption = ''Tchernyshevioides ninae''
+| display_parents = 2
-| regnum = [[Animal]]ia
+| taxon = Hebediscidae
-| phylum = [[Arthropod]]a
+| authority = Kobayashi, 1944
-| classis = [[Trilobita]]
+| synonyms = *Delgadoiinae
-| ordo = [[Agnostida]]
+*Pagetiellinae
-| subordo = [[Eodiscina]]
+*Dicerodiscinae
-| superfamilia = Eodiscoidea
+| subdivision_ranks =  Genera
-| familia = '''Hebediscidae'''
+| subdivision_ref = <ref name="Treatise"/>
-| familia_authority = Kobayashi, 1944
-| synonyms = Delgadoiinae, Pagetiellinae, Dicerodiscinae
-| subdivision_ranks =  [[genera]]
 | subdivision =
-* ''[[Hebediscus]]''
 * ''[[Delgadella]]''
 * ''[[Dicerodiscus]]''
+* ''[[Hebediscus]]''
 * ''[[Luvsanodiscus]]''
 * ''[[Limbadiscus]]'' <!--- ''Natalina'' E. Romanenko, 1978, is preoccupied by ''Natalina'' Pilsbry, 1893, a pulmonate land snail, see <ref>{{cite journal|last= Özdikmen|first= H.|year= 2009|title= Nomenclatural changes for twenty trilobites genera|journal= Munis Entomology & Zoology|volume= 4|issue=1|pages=155–171}}</ref> --->
 * ''[[Neopagetina]]''
 * ''[[Parapagetia]]''
-* ''[[Tchernyshevioides]]''<ref name="Treatise"/>
+* ''[[Tchernyshevioides]]''
 }}
-The '''Hebediscidae''' are a family of [[trilobite]]s belonging to the order [[Agnostida]] that lived during the Lower Cambrian (Atdabanian to Toyonian). They are small or very small, and have a thorax of two or three segments. The Hebediscidae include five genera (see box).
+'''Hebediscidae''' is a family of [[trilobite]]s belonging to the order [[Agnostida]] that lived during the Lower Cambrian (Atdabanian to Toyonian). They are small or very small, and have a thorax of two or three segments. The Hebediscidae include five genera (see box).
 == Taxonomy ==
-The Hebediscidae probably descended from the [[Tsunydiscidae]] and gave rise to the [[Weymouthiidae]].<ref>{{cite journal|last= Jell|first= P.A.|year= 1975|title= Australian Middle Cambrian Eodiscoids with a review of the superfamily|journal= Palaeontographica Abteilung A|volume=150|pages=1–97}} cited in {{cite book|last= Whittington|first= H.B.|year= 1997|series= [[Treatise on Invertebrate Paleontology]]|volume= Part O, Revised|title= Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida|pages= 348–349}}</ref>
+The Hebediscidae probably descended from the [[Tsunyidiscidae]] and gave rise to the [[Weymouthiidae]].<ref>{{cite journal|last= JELL|first= P. A.|year= 1975|title= Australian Middle Cambrian Eodiscoids with a review of the superfamily|journal= Palaeontographica Abteilung A|volume=150|pages=1–97}} cited in {{cite book|last= WHITTINGTON|first= H. B.|year= 1997|series= [[Treatise on Invertebrate Paleontology]]|volume= Part O, Revised|title= Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida|pages= 348–349}}</ref>
 == Description ==
-Like all Agnostida, the Hebediscidae are diminutive and the headshield (or [[Cephalon (arthropod head)#Trilobites|cephalon]]) and tailshield (or [[pygidium]]) are of approximately the same size (or [[Pygidium#Trilobites|isopygous]]) and outline. In the Hebediscidae, the central raised area of the cephalon (or [[Cephalon (arthropod head)#Trilobites|glabella]]) is wide at its rear end, has parallel sides or tapers forward, and without transverse glabellar furrows, although the lobes may be apparent if they are expanded. A three segment thorax is known in ''Hebediscus'', ''Delgadella'' and ''Tchernyshevioides''. The pygidium has a wide, tapering axis of more than four segments.<ref name="Treatise">{{cite book|last= Whittington|first= H. B. |year= 1997|series= [[Treatise on Invertebrate Paleontology]]|volume= Part O, Revised|title= Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida|pages= 390–392}}</ref>
+Like all Agnostida, the Hebediscidae are diminutive and the headshield (or [[Cephalon (arthropod head)#Trilobites|cephalon]]) and tailshield (or [[pygidium]]) are of approximately the same size (or [[Pygidium#Trilobites|isopygous]]) and outline. In the Hebediscidae, the central raised area of the cephalon (or [[Cephalon (arthropod head)#Trilobites|glabella]]) is wide at its rear end, has parallel sides or tapers forward, and without transverse glabellar furrows, although the lobes may be apparent if they are expanded. A three segment thorax is known in ''Hebediscus'', ''Delgadella'' and ''Tchernyshevioides''. The pygidium has a wide, tapering axis of more than four segments.<ref name="Treatise">{{cite book|last= WHITTINGTON|first= H. B. |year= 1997|series= [[Treatise on Invertebrate Paleontology]]|volume= Part O, Revised|title= Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida|pages= 390–392}}</ref>
 == References ==
@@ Line 39: / Line 36: @@
 {{Taxonbar|from=Q1034703}}
-[[Category:Agnostida]]
+[[Category:Eodiscina]]
+[[Category:Trilobite families]]
 [[Category:Cambrian trilobites]]
 [[Category:Cambrian first appearances]]
 [[Category:Cambrian Series 2 extinctions]]
+{{agnostida-stub}}