PBDB Taxon

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Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Dichentomum

Insecta - Permopsocida - Psocidiidae

Taxonomy

Dichentomum was named by Tillyard (1926).

It was assigned to Dichentomidae by Carpenter (1933) and Zimmerman (1962); and to Psocidiidae by Carpenter (1992), Novokshonov (1998), Rasnitsyn (2004) and Huang et al. (2016).

Species

D. arroyo, D. complexum, D. grande, D. latum, D. minimum, D. parvulum, D. tinctum (syn. Psocidium abnormale, Permentomum tenuiforme, Psocidium robustum, Pentapsocidium indistinctum, Psocidium permianum, Psocidium kansasense, Chaetopsocidium sellardsi, Metapsocidium loxoneurum)

Synonyms

Psocidium was named by Tillyard (1926).

It was synonymized subjectively with Dichentomum by Carpenter (1932).

It was assigned to Psocidiidae by Tillyard (1926).
Chaetopsocidium was named by Tillyard (1926).

It was synonymized subjectively with Dichentomum by Carpenter (1932).

It was assigned to Psocidiidae by Tillyard (1926).
Metapsocidium was named by Tillyard (1926).

It was synonymized subjectively with Dichentomum by Carpenter (1932).

It was assigned to Psocidiidae by Tillyard (1926).
Pentapsocidium was named by Tillyard (1926).

It was synonymized subjectively with Dichentomum by Carpenter (1932).

It was assigned to Psocidiidae by Tillyard (1926).
Permentomum was named by Tillyard (1926).

It was synonymized subjectively with Dichentomum by Carpenter (1932).

It was assigned to Psocidiidae by Tillyard (1926).

Synonymy list

Year	Name and author
1926	Dichentomum Tillyard p. 320
1926	Psocidium Tillyard p. 321
1926	Chaetopsocidium Tillyard p. 331
1926	Metapsocidium Tillyard p. 332
1926	Pentapsocidium Tillyard p. 334
1926	Permentomum Tillyard p. 335
1933	Dichentomum Carpenter
1962	Dichentomum Zimmerman p. 1329
1992	Dichentomum Carpenter p. 192
1998	Dichentomum Novokshonov p. 44
2004	Dichentomum Rasnitsyn p. 227
2016	Dichentomum Huang et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Ecdysozoa
—	Panarthropoda
phylum	Arthropoda	Latreille 1829
superclass	Hexapoda	Latreille 1825
class	Insecta
—	Dicondylia

Rank	Name	Author
—	Paranotalia
subclass	Pterygota	()
—	Neopterygota	Crampton 1924
infraclass	Neoptera	Martynov 1923
—	Clareocercaria
—	Acercaria	()
order	Permopsocida	()
family	Psocidiidae
genus	Dichentomum

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Dichentomum Tillyard 1926

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†Dichentomum arroyo Rasnitsyn 2004

†Dichentomum complexum Carpenter 1926

†Dichentomum grande Carpenter 1933

†Dichentomum latum Carpenter 1932

†Dichentomum minimum Tillyard 1926

†Dichentomum parvulum Carpenter 1932

†Dichentomum tinctum Tillyard 1926

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Invalid names: Chaetopsocidium sellardsi Tillyard 1926 [synonym], Metapsocidium loxoneurum Tillyard 1926 [synonym], Pentapsocidium indistinctum Tillyard 1926 [synonym], Permentomum tenuiforme Tillyard 1926 [synonym], Psocidium abnormale Tillyard 1926 [synonym], Psocidium kansasense Tillyard 1926 [synonym], Psocidium permianum Tillyard 1926 [synonym], Psocidium robustum Tillyard 1926 [synonym]

Invalid names: Chaetopsocidium Tillyard 1926 [synonym], Metapsocidium Tillyard 1926 [synonym], Pentapsocidium Tillyard 1926 [synonym], Permentomum Tillyard 1926 [synonym], Psocidium Tillyard 1926 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

chitinc

Environment:

terrestrialc

Locomotion:

actively mobilep

Created:

2017-04-17 09:56:18

Modified:

2017-04-17 09:56:18

Source: c = class, p = phylum

References: Kiessling 2004, Bush and Bambach 2015

Age range: base of the Asselian to the top of the Kungurian or 298.90000 to 272.30000 Ma

Collections (11 total)

Time interval	Ma	Country or state	Original ID and collection number
Asselian	298.9 - 295.5	USA (New Mexico)	D. arroyo (124386) D. sp. (124387)
Artinskian	290.1 - 279.3	USA (Kansas)	D. complexum (151412) D. tinctum (21979 111320 114151) D. tinctum, D. grande (111319) D. tinctum, D. minimum, D. latum, D. parvulum (111217) D. tinctum, Psocidium sp., Psocidium permianum, Psocidium abnormale, Psocidium robustum, Psocidium kansasense, Psocidium minimum, Chaetopsocidium sellardsi, Metapsocidium loxoneurum, Pentapsocidium indistinctum, Permentomum tenuiforme (111219)
Artinskian	290.1 - 279.3	USA (Oklahoma)	D. tinctum (104826)
Kungurian	279.3 - 272.3	Russian Federation (Suksun)	D. sp. (108206)