amphistomous

English

Etymology

amphi- +‎ stoma +‎ -ous

Adjective

amphistomous (not comparable)

1. (zoology) Having a sucker or opening at each extremity.

   Some entozoa are amphistomous.

   • 1875 April, “Miscellany: Food of the Bongos”, in Popular Science, volume 6, number 41, page 766:

     They would even strip off the amphistomous worms which literally live in the stomachs of all cattle in this region, and, without more ado, put them raw into their mouths by the handful.

   • 1889, The Annals and Magazine of Natural History - Volume 4, page 302:

     In many a pylom occurs also at the aboral pole, so that the shell, perforated by a mouth at both poles of the principal axis, acquires an amphistomous character.

   • 1901, Pamphlets on Protozoology (Kofoid Collection):

     Some shells of an amphistomous Rhizopod were observed from near Recess, W. Ireland, which probably pertained to this genus. The shells were chitinoid, yellow in colour, and each aperture was situated on a slight protuberance.

   • 2009, Daniel H. Shain, Annelids in Modern Biology, page 108:

     Arendt and coworkers propose that the blastopore in this species is amphistomous, giving rise to both mouth and anus.

   • 2013, K. V. Galaktionov, A. Dobrovolskij, The Biology and Evolution of Trematodes, page 507:

     Contrary to the view of Cable (1974), we do not consider larvae of this species as amphistomous.

2. (botany) Having stomata on both surfaces of the leaf.
   • 1985, Systematic Botany Monographs, page 15:

     Adaxial and abaxial surfaces of three taxa of the Acutae group in the Pacific Northwest (C. aquatilis, C. lenticularis, and C. nebrascensis) are not differentiated (the amphistomous condition) .

   • 2012, Robert W. Pearcy, J.R. Ehleringer, Harold Mooney, Plant Physiological Ecology: Field methods and instrumentation:

     For most amphistomous leaves, the correct value for g_lw is between those given by Equations 11.24 and 11.25 (Moreshet et al., 1968).

   • 2012, Scaling Physiological Processes: Leaf to Globe, page 329329:

     Parkhurst et al. (1988) showed that gradients of more than 50 μbar CO₂ are common in amphistomous leaves of C₃ plants.