(redirected from prostomial)
Also found in: Medical, Encyclopedia.


n. pl. pro·sto·mi·a (-mē-ə)
The anterior portion of the head of an annelid worm, situated in front of the mouth.

[New Latin, from Greek prostomion, mouth, lips : pro-, in front of; see pro-2 + stoma, mouth.]

pro·sto′mi·al (-əl) adj.


n, pl -mia (-mɪə)
(Zoology) the lobe at the head end of earthworms and other annelids: bears tentacles, palps, etc, or forms part of a sucker or proboscis
[via New Latin from Greek prostomion mouth]
proˈstomial adj


(proʊˈstoʊ mi əm)

n., pl. -mi•a (-mi ə)
a small protuberance from the first segment above the mouth in certain worms and mollusks.
[1865–70; < Greek prostómion mouth. See pro-2, stoma, -ium2]
pro•sto′mi•al, adj.
References in periodicals archive ?
This radiolar crown is bilobed and likely derived from prostomial tissue homologous to the palps of other polychaetes (Orrhage, 1980; Orrhage and Muller, 2005).
Prostomial, peristomial appendages and dorsal cirri are all non-articulated; peristomial cirri reach to the mid prostomium.
kristiani Salazar-Vallejo, 1987, diferenciandose en el numero de ojos, la forma del lobulo prostomial anterior y en las dimensiones relativas de los cirros del segundo setigero.
Structure of the prostomial appendages and the central nervous system in the Protodrilida (Polychaeta).
On the other hand, Kinberg (1865:561) used the relative development of the anterior prostomial margin to propose a new genus and separated several species in Eriphyle, with Eriphyle capensis Kinberg, 1865 as the type species.