n.; pl. -ria [Gr. 4th letter, delta; thyrion, door]
The central triangular notch in the ventral valve, open to the hinge line; facilitating the passage of the pedicle; usually closed off from the hinge plate by the deltidium; delthyrial a; see notothyrium.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • delthyrium — del·thy·ri·um …   English syllables

  • delthyrium — …   Useful english dictionary

  • lamp shells — ▪ animal Introduction also called  brachiopod,         any member of the phylum Brachiopoda, a group of bottom dwelling marine invertebrates. They are covered by two valves, or shells; one valve covers the dorsal, or top, side; the other covers… …   Universalium

  • delthyrial — (ˈ)del|thīrēəl adjective Etymology: New Latin delthyrium + English al : of, relating to, or constituting a delthyrium …   Useful english dictionary

  • Rhynchonellida — Taxobox image width = 240px image caption = Hiscobeccus capax name = Rhynchonellida regnum = Animalia phylum = Brachiopoda classis = Rhynchonellata ordo = Rhynchonellida ordo authority = Kuhn, 1949 subdivision ranks = Superfamilies subdivision =… …   Wikipedia

  • deltidial plates — (BRACHIOPODA) A plate or pair of plates growing medially from the margin of the delthyrium, almost or completely closing it …   Dictionary of invertebrate zoology

  • deltidium — n.; pl. tidia, [Gr. 4th letter Δ, delta; idion, dim.] (BRACHIOPODA) A plate that closes off the delthyrium, in some forms there are two plates; also called pseudodeltidium …   Dictionary of invertebrate zoology

  • homeodeltidium — n. [Gr. homoios, like; 4th letter, delta; dim. thyrion, door] (BRACHIOPODA) A convex triangular plate closing most or only the apical part of the delthyrium …   Dictionary of invertebrate zoology

  • mesothyridid — n. [Gr. mesos, middle; thyridos, a window] (BRACHIOPODA) Pedicle opening partly in the ventral umbo and partly in the delthyrium, with beak ridges appearing to bisect the opening …   Dictionary of invertebrate zoology

  • notothyrium — n. [Gr. notos, back; thyrion, door] (BRACHIOPODA) The triangular notch in the dorsal valve, when present, open to the hinge line facilitating pedicle exit, usually closed off from the hinge plate by the chilidium; see delthyrium …   Dictionary of invertebrate zoology

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