rhynchostomen.
/ˈrɪŋkə(ʊ)stəʊm/, U.S. /ˈrɪŋkoʊˌstoʊm/ Zoology.
In whelks and related gastropods, and in nemerteans: the anterior opening of the rhynchodaeum, through which the proboscis is everted.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [noun] > member of > parts of > opening of rhynchodaeum
rhynchostome1894
1894 Jrnl. Royal Microsc. Soc. 328 Oswald proposes to call the space between the introvert or proboscis [of certain gastropods] and its sheath the rhynchodæum, its anterior opening the rhynchostome, the opening at the apex of the proboscis the pharyngostome, and the oral aperture proper, where ectoderm joins the endoderm, the gastrostome.
1976 Biol. Bull. 150 65 The rhynchostome is applied to the insect and the soft parts are sucked out, leaving the exoskeleton and any internal hard parts.
2004 Toxicon 44 516/1 The proboscis is everted through a pore at the tip of the head, the rhynchostome.
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
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n.1894