The Puerto Rican parrot is a uniquely American parrot, but one of eight parrot species found in the Caribbean (30 species comprise the 4 million years (MY) old-genus radiation in the Amazon region), a graphic example of speciation via island biogeography.
Both k-medoids and HOPACH suggest similar age estimates (Table 1), with most notably a recent diversification (<5 MY) of the genus Microcebus.
Despite its relatively recent origin (approximately 10 my old), the genus Agave has a high adaptive radiation and an active process of speciation, with a diversification rate (0.32 species per my), only comparable with the rosetophyllous silversword (0.56 species per my) (Baldwin and Sanderson 1998; Eguiarte and Souza 2007).
As a child, I admired my parents' original 1982 Genus Edition: I loved the plain, dusty blue box, the candy-colored triangular plastic wedges, and the crisp, unbent cards.
my] and crown [2.5 my] age of the genus Oreotrochilus, of which we included three of its six species.
This year I'm employing a new strategy picked up from my colleagues at Kew to help my collection fight back: a genus of carnivorous plants called Pinguicula, more commonly known as the butterworts.
MY relationship with the Oenothera genus has been a decidedly on-again, off-again affair over the past 25 years.
Because the Cotesia genus is 10 My old (Dupuy et al. 2006), we included only one of the two species in our analysis of HT (table 1).
This method estimates the age of the Nothobranchius genus to be 8.3 (6.0 – 10.7) My and the separation of the four clades 4.8 (2.7-7.0 2.7-7.0
Trigonodon (Fig. 1, node 3): The fossil Trigonodon jugleri [ 17, 65], known from the Early Miocene (20 MY), is a stem chiseltooth wrasse (genus Pseudodax).
