Question: Which genus, Bismarckia or Adonis, if either, contains more species ?

 The genus is named for the first chancellor of the German Empire Otto von Bismarck and the epithet for its only species, Bismarckia nobilis, comes from Latin for 'noble'. Bismarckia is a monotypic genus of flowering plant in the palm family endemic to western and northern Madagascar where they grow in open grassland. <SEP> The mydid fly genus Rhaphiomidas contains fewer than 30 species/subspecies, all of them occurring in the desert regions of the southwestern United States and adjacent portions of northwestern Mexico.  The adults are most commonly encountered in sand dune areas, and are typically only active for a few weeks each year, either in the spring or the fall; in some cases, more than one species can occur in the same dune system, but they are allochronic, each flying in different seasons.  Almost nothing is known about their biology, though eggs or early instar larvae of some species are laid on the soil surface and appear to be attractive to ants, and are brought into the ant nest (it therefore seems likely that the larvae are predators of the ant brood).  The restriction to sand dune areas has unfortunately led a number of these flies to the brink of extinction, especially both subspecies of "R. terminatus", and the species "R. trochilus".  While there is only one of these on the Endangered Species List ("Rhaphiomidas terminatus abdominalis", a.k.a. the "Delhi Sands Flower-loving fly"), many of the remaining taxa - including a few that have not yet been named - are gravely imperiled, as they are restricted to small geographic areas (less than 500 sqmi , sometimes much less), rendering them extremely vulnerable to habitat loss or disturbance.  These habitats are heavily targeted for development, and even if not, activities such as sand mining or motorized off-roading are common, and render the habitat unsuitable for the survival of the flies. <SEP> Adonis is a genus of about 20–30 species of flowering plants of the crowfoot family, Ranunculaceae, native to Europe and Asia. <SEP> Langeronyx is an extinct genus of basal rhynchosaurid known from the early Middle Triassic (Anisian stage) Bromsgrove Sandstone Formation of Warwickshire, UK.  It contains a single species, Langeronyx brodiei, originally included in the genus "Rhynchosaurus".  "R. brodiei" was first described and named by Michael Benton in 1990, but its redescription by Martín D. Ezcurra, Felipe Montefeltro and Richard J. Butler in 2016 recovered it as more closely related to the more advance hyperodapedontine than to the type species of "Rhynchosaurus" and thus it was moved to its own genus.  The generic name "Langeronyx" honors the Brazilian paleontologist Max Cardoso Langer in recognition of his rhynchosaur research, combined with the Greek "onyx" ("óνυξ") meaning "claw", a common suffix for rhynchosaur genera.  "L. brodiei" is known solely from the holotype, a partial skull divided into the two specimens WARMS G6097/1 and NHMUK PV R8495, housed in the Warwickshire Museum, Warwick and Natural History Museum, London, respectively.  Other specimens originally referred to "R. brodiei" either do not overlap with its type or can be just as likely referred to other basal rhynchosaurids (like "Fodonyx spenceri" and "Bentonyx sidensis" from the coeval Otter Sandstone Formation, UK).  "L. brodiei" is one of two basal archosauromorphs known from the Bromsgrove Sandstone Formation, the other being the lesser known "Rhombopholis scutulata".