tetraxons

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orthotriaenes — adj.pl. [Gr. orthos, straight; triaina, trident] (PORIFERA) In tetraxons, having clads in the angular form of about 90° with the axis of the rhabdome … Dictionary of invertebrate zoology
plagiotriaene — adj. [Gr. plagios, oblique; triaina, trident] (PORIFERA) In tetraxons, having clads directed forward and making an angle of about 45° with the produced axis of the rhabdome … Dictionary of invertebrate zoology
protriaenes — n. pl. [L. pro, before; Gr. triaina, trident] (PORIFERA) Tetraxons, with three clads directed forward making an angle of less than 45° with the produced axis of the rhabdome … Dictionary of invertebrate zoology
sponge — spongeless, adj. spongelike, adj. spongingly, adv. /spunj/, n., v., sponged, sponging. n. 1. any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or… … Universalium
Sponge spicule — Sponge spicules Spicules are structural elements found in most sponges. They provide structural support and deter predators. Large spicules, visible to the naked eye are referred to as megascleres, while smaller, microscopic ones are termed… … Wikipedia

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