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Brachyphyllum kachaikensis
Taxonomy
Brachyphyllum kachaikensis was named by Passalia (2007). It is not extant. It is considered to be a form taxon. Its type locality is Bajo Comisión 1 - NFE, which is in an Albian/Cenomanian delta plain shale in the Kachaike Formation of Argentina.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2007 | Brachyphyllum kachaikensis Passalia |
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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.
†Brachyphyllum kachaikensis Passalia 2007
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. G. Passalia 2007 | Shoots branched at acute angle (near to 45º). Leaves scale-like, helically arranged; adpressed, with rhomboidal to oval leaf base cushion and acute apex. Free part of leaf 1/4 to 1/3 of total length. Leaf size 2-2,5 mm long and 1-1,4 mm broad (breadth/length ratio 1,5: 1 to 2: 1). Cuticle thick. Leaf margin macroscopically entire, but microscopically serrate. Epidermal cells isodiametric to rectangular (mostly elongated in longitudinal sense); periclinal cell walls usually smooth but occasionally short and slightly striae; anticlinal cell walls straight, cutinized. Hypodermal cell remains longitudinally elongated, strongly cutinized. Stomata present on both sides. On adaxial side only a few without an apparent order. On abaxial side stomata are uniform scattered but sometimes forming short ill-defined longitudinal rows, covering 2/3 of total leaf surface. Stomata typically monocyclic (sometimes imperfectly dicyclic); with a deep hypostomatical chamber. Subsidiary cells usually 5 (occasionally 4 or 6), isodiametric to polygonal. Subsidiary cells of neighboring stomata in contact. Guard cells slightly sunken. Mouth of pit basically oval to rounded, variably orientated. |
Measurements
No measurements are available
No ecological data are available
Age range: base of the Late/Upper Albian to the top of the Cenomanian or 106.30000 to 93.90000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Albian - Cenomanian | Argentina (Chubut) | Brachyphyllum kachaikensis (150880) | |
| Late/Upper Albian - Cenomanian | Argentina (Santa Cruz) | Brachyphyllum kachaikensis (type locality: 150637) |