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Harajicadectes

Genus of stem-tetrapod from the Middle–Late Devonian From Wikipedia, the free encyclopedia

Harajicadectes (/ˌhærəˌdʒiːkəˈdɛktiːz/, meaning "Harajica biter") is a genus of stem-tetrapod from the Givetian to Frasnian Amadeus Basin in Northern Territory, Australia. The type and only species is Harajicadectes zhumini, known from 13 specimens of various preservation quality.[1]

Phylum:Chordata
Clade:Sarcopterygii
Clade:Rhipidistia
Clade:Tetrapodomorpha
Quick facts Scientific classification, Binomial name ...
Harajicadectes
Temporal range:
Givetian to Frasnian, 387.7–372.2 Ma
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Reconstructed skull and pectoral girdle of Harajicadectes zhumini
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Clade: Sarcopterygii
Clade: Rhipidistia
Clade: Tetrapodomorpha
Genus: †Harajicadectes
Choo et al., 2024
Species:
†H. zhumini
Binomial name
†Harajicadectes zhumini
Choo et al., 2024
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Etymology

The generic name, Harajicadectes, is derived from the geologic member the specimens were found in, the Harajica Sandstone Member, and the Greek 'dēktēs', which translates to 'biter'. The specific name, zhumini, honours Prof. Min Zhu of the Institute of Vertebrate Paleontology and Paleoanthropology, Beijing, China, for his numerous contributions to early vertebrate paleontology.[1]

Description

Choo et al. (2024) assigned a holotype and paratype to Harajicadectes, NTM P6410 and CPC 39948, respectively. The holotype consists of a partial skull and much of the body outline in dorsal view with squamation preserved. The paratype consists of a partial skull, the right post-temporal, and the right lower jaw.[1]

Classification

Choo et al. (2024) recovered Harajicadectes as a stem-tetrapod in their phylogenetic analyses. They reconstructed two trees collated from 336 most parsimonious trees. The first tree is a strict consensus tree, the numbers represent Bremer support values. The second tree is a 50% majority-rule consensus tree, the numbers are node support bootstrap values.[1] Their results are reproduced below:

Topology A: strict consensus tree
Tetrapodomorpha

Tungsenia paradoxa

Kenichthys campbelli

Rhizodontida

Gyroptychius agassizi

Osteolepis macrolepidotus

Gogonasus andrewsae

Cladarosymblema narienense

Ectosteorhachis nitidus

Megalichthys hibberti

Medoevia lata

Beelarongia patrichae

Canowindra grossi

Koharalepis jarviki

Harajicadectes zhumini

Marsdenichthys longioccipitus

Eotetrapodiformes

Topology B: 50% majority-rule consensus tree
Tetrapodomorpha

Tungsenia paradoxa

Kenichthys campbelli

Rhizodontida

"Osteolepididae"

Harajicadectes zhumini

Gyroptychius agassizi

Osteolepis macrolepidotus

Medoevia lata

Gogonasus andrewsae

Cladarosymblema narienense

Ectosteorhachis nitidus

Megalichthys hibberti

Beelarongia patrichae

Canowindra grossi

Koharalepis jarviki

Marsdenichthys longioccipitus

Eotetrapodiformes

References

  1. [1]
    Choo, Brian; Holland, Timothy; Clement, Alice M.; King, Benedict; Challands, Tom; Young, Gavin; Long, John A. (5 February 2024). "A new stem-tetrapod fish from the Middle–Late Devonian of central Australia". Journal of Vertebrate Paleontology. 43 (3). doi:10.1080/02724634.2023.2285000.
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