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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 827hind the cephalon. 2. (MOLL: Bivalvia) The outer fold <strong>of</strong> themantle edge that houses the periostracal glands at itsbase.shell gland 1. (ARTHRO: Crustacea) see maxillary gland. 2.(MOLL) Specialized epithelium that secretes the shell mantle.3. (PLATY: Trematoda) Mehlis' gland.shield n. [A.S. scyld, shield] 1. A dorsal cover; carapace;scutellum; scutum; clypeus. 2. (ARTHRO: Crustacea) In Decapoda,the anterior part <strong>of</strong> the cephalothorax <strong>of</strong> Paguridae.3. (ARTHRO: Diplopoda) The second tergite. 4.(NEMATA) The interlabium.shoulder a. [A.S. sculdor, shoulder] 1. Any obtuse angulation.2. (MOLL: Gastropoda) The angulation <strong>of</strong> the shell whorls,forming the abaxial edge <strong>of</strong> the sutural ramp or shelf;shoulder angle.shovel n. [A.S. sc<strong>of</strong>l, shovel] (ARTHRO: Insecta) In Ephemeroptera,the expanded, flattened leg joints.sibling species True species populations that are reproductivelyisolated, but morphologically identical or nearly so;cryptic species.side n. [A.S. side, side] (MOLL: Gastropoda) The surface <strong>of</strong> ashell, when present, between the shoulder and abapicalsuture or margin <strong>of</strong> the base.Siebold's organ see crista acousticasieve area (PORIF) The area containing inhalant apertures.sieve plate 1. (ECHINOD) see madreporite. 2. (PORIF) Aplate-like porous structure below the osculum.sieve tracheae (ARTHRO: Chelicerata) In Ricinulei, bundles <strong>of</strong>tracheae that arise from a tubule <strong>of</strong> an ectodermal invaginationon the 8th somite. see tube tracheae.sigillum n.; pl. sigilla (ARTHRO: Chelicerata) 1. In some spiders,the impressed, suboval, clear areas on the sternum.2. In Acari, the external mark <strong>of</strong> a muscle insertion.sigma n. [Gr. the 16th letter, sigma] 1. (ARTHRO: Insecta) Seefurca. 2. (PORIF) A C-shaped diactinal microsclere.sigmaspires n.pl. [Gr. the 16th letter, sigma; speira, twist](PORIF) Diactinal microsclere sigmas that are spirally

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