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Athrotaxis rhomboidea

Coniferales - Cupressaceae

Taxonomy
Athrotaxis rhomboidea was named by Hill et al. (1993) [Type Locality: BHP drill hole WA2, E.L.33179, from Bells Plains, Murchison Highway. Specimens Examined: LRR1-1111, 1134.]. It is considered to be a form taxon. Its type specimen is Holotype: WA2-002, stored in the Department of Plant Science, University of Tasmania., a leaf (Cuticle), and it is a compression fossil.

Synonyms
  • Mesibovia rhomboidea was named by Wells and Hill (1989) [Type locality. BHP drill hole WA2, E.L.33179, from Bells Plains, Murchison Highway. Specimens examined. WA2-001,002, LRR1-244, P-621.]. It is considered to be a form taxon. Its type specimen is Holotype. WA2-002; Department of Plant Science, University of Tasmania., a leaf (Cuticle), and it is a compression fossil.

    It was replaced with Athrotaxis rhomboidea by Hill et al. (1993).
Synonymy list
YearName and author
1989Mesibovia rhomboidea Wells and Hill p. 417 figs. 87-94
1993Athrotaxis rhomboidea Hill et al. p. 247 figs. 23 - 26

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RankNameAuthor
kingdomPlantae
phylumSpermatophyta
phylumPinophyta
orderConiferales
RankNameAuthor
familyCupressaceae
subfamilyAthrotaxidoideae
genusAthrotaxisDon 1839
speciesrhomboidea

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.

†Athrotaxis rhomboidea Hill et al. 1993
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Invalid names: Mesibovia rhomboidea Wells and Hill 1989 [replaced]
Diagnosis
ReferenceDiagnosis
P. M. Wells and R. S. Hill 1989 (Mesibovia rhomboidea)Leaves decurrent, not strongly keeled, 1-8-2.2 mm long, 0.7-0.9 mm wide. Stomata tightly packed in crowded zones, two zones extending almost from base to apex either side of wide stomata-free midregion on adaxial surface, two much smaller zones on basal corners of abaxial surface. Zones composed of randomly oriented, amphicyclic stomata, normal epidermal cells rare. Stomata1 complex irregular in outline, separated from neighbours by subsidiary cells only. Subsidiary cells 4-6, of irregular shapes and sizes, almost always shared with adjacent stomata, periclinal walls flat and granular, anticlinal walls thin, smooth, polar ends rounded, polar and lateral subsidiary cells indistinguishable. Guard cells' cuticular flange ovate in outline, polar ends rounded, lateral and polar extensions not developed. Epidermal cells between stomata1 zones along adaxial midregion and most of the abaxial surface, rectangular, narrow, oriented parallel to long axis of leaf, periclinal walls granular, anticlinal walls thin, smooth, straight.
R. S. Hill et al. 1993Leaves decurrent, not strongly keeled, 1.8-2.2 mm long, 0.7-0.9 mm wide. Stomates in two zones extending almost from base to apex either side of a wide stomate-free mid-region on adaxial surface, two much smaller zones on basal comers of abaxial surface. Marginal frill absent.
Measurements
No measurements are available
No ecological data are available

Age range: base of the Early/Lower Oligocene to the top of the Oligocene or 33.90000 to 23.03000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Oligocene33.9 - 28.4Australia (Tasmania) Athrotaxis rhomboidea, Mesibovia rhomboidea (166705)
Oligocene33.9 - 23.03Australia (Tasmania) Athrotaxis rhomboidea, Mesibovia rhomboidea (167313)
Late/Upper Oligocene - Early/Lower Miocene28.4 - 15.97Australia (Tasmania) Mesibovia rhomboidea (166703)