Hemisphere-scale differences in conifer evolutionary dynamics

In a fossil-calibrated time tree sampling 489 living conifer species, predominantly Southern Hemisphere lineages including Araucariaceae had an older combined median extant-node age than sampled Northern Hemisphere Pinaceae and Cupressoideae, 8.7 versus 5.2 Ma; this relative modelled pattern is not a fossil range or family-origin date.

Leslie et al. assembled an age-calibrated phylogeny sampling about 80% of living conifer species to compare sampled hemispheric clades; this molecular tree is not a complete total-group taxonomy, direct ancestor sequence or fossil occurrence ledger.

The sampled living conifer tree contains broadly Northern- and Southern-Hemisphere lineages and supports a modelled contrast in their evolutionary dynamics; the result does not establish complete present or past distributions for Coniferophyta.

The cited conifer analysis uses molecular sequences and fossil calibrations rather than a clade-wide morphological matrix; this profile therefore withholds universal leaf, cone and body-form traits instead of converting calibration fossils into body-character observations.

Leslie et al. discuss broad climatic and habitat contrasts around sampled living lineages but do not measure one diet, habitat, growth form, body-size distribution or ecological guild for all Coniferophyta; those profile fields remain explicitly ungeneralized.