Advertisement

Advertisement

prostomium

[ proh-stoh-mee-uhm ]

noun

, plural pro·sto·mi·a [proh-, stoh, -mee-, uh].
  1. the unsegmented, preoral portion of the head of certain lower invertebrates.


prostomium

/ prəʊˈstəʊmɪəm /

noun

  1. the lobe at the head end of earthworms and other annelids: bears tentacles, palps, etc, or forms part of a sucker or proboscis
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Discover More

Derived Forms

  • proˈstomial, adjective
Discover More

Other Words From

  • pro·stomi·al adjective
Discover More

Word History and Origins

Origin of prostomium1

1865–70; < New Latin < Greek prostómion mouth. See pro- 2, stoma, -ium
Discover More

Word History and Origins

Origin of prostomium1

via New Latin from Greek prostomion mouth
Discover More

Example Sentences

At the same time the prostomium and its appendages cease to be recognizable as distinct elements of the head.

The prostomium is essentially a part or outgrowth of the first somite, and cannot be regarded as itself a somite.

Pr, The prostomium. m, The mouth.

About 1870 the question arose for discussion whether the somites in front of the mouth are to be considered as derived from the prostomium of a Chaetopod-like ancestor.

The parapodia of Chaetopoda are never coated with dense chitin, and are, therefore, never converted into jaws; the primitive “head-lobe” or prostomium persists, and frequently carries eyes and sensory tentacles.

Advertisement

Advertisement

Advertisement

Advertisement


prostomiateprostoon