Dicostalia see secundibracts

dicranoclone n. [Gr. dikranon, pitchfork; klon, twig] (PORIF) A megasclere spicule having a desma with swollen terminal couplings.

dictyonal framework (PORIF) Spicules fused together into a rigid framework.

dictyonine n.; pl. dictyonalia [Gr. diktyon, net] (PORIF: Hex-actinellida) Rays of regular hexactines fused at their tips to form a more or less regular three dimensional network.

dictyosome n. [Gr. diktyon, net; soma, body] The flattened set of membranes resembling a stack of plates found in a Golgi body.

dicyclic a. [Gr. dis, twice; kyklos, circle] (ECHINOD: Crinoidea) Calyx plates of primitive stalked crinoids that have an additional five infrabasal plates on the aboral side of the basal series found in the monocyclic condition; further plates may be present.

didactyl a. [Gr. dis, twice; daktylos, finger] Having two tarsi of equal length. didactyl n.; didactylism n.; didactylous a.

didelphic a. [Gr. dis, twice; delphys, womb] Having two uteri. see amphidelphic.

diductor muscles (BRACHIO) Two pairs of muscles that open valves of articulates, commonly attached to brachial valve immediately anterior to beak; principal pair usually inserted in pedicle valve on either side of adductor muscles with posterior accessory pair.

didymous a. [Gr. didymos, double] Formed in pairs; twin; double.

diecdysis n. [Gr. dia, through; ekdysis, escape from molt] Condition in which ecdysial processes are going on continuously and one ecdysis cycle passes rapidly into another.

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