Barrier reef see coral reef

basad adv. [L. basis, base; ad, to] Toward the base.

basal a. [L. basis, base] Pertaining to the base; near the point of attachment of a structure or appendage.

basalar a. [L. basis, base; ala, wing] (ARTHRO: Insecta) Pertaining to the sclerites below the wing base.

basal bud (BRYO: Gymnolaemata) The bud arising from the basal wall of the parent zooid. see distal bud.

basal canal (BRYO) The circumoral lacuna of the lophophore into which the internal lacunae of all the tentacles open.

basal diaphragm (BRYO: Stenolaemata) The diaphragm acting as the floor of the living chamber.

basal disc (BRYO: Stenolaemata) The encrusting proximal-most part of an ancestrula.

basalia a. [L. basis, base] (porif) Pertaining to spicules protruding from the lower surface of a sponge.

basalis n. [L. basis, base] (ARTHRO: Insecta) The main mandibular sclerite to which all other parts are joined.

basal knobs (NEMATA) The posterior knobs of the oral stylet. see stylet knobs.

basal lamina (porif) The attachment surface.

basal margin (ARTHRO: Crustacea) In Cirripedia, the lower edge of the scutum, tergum or other plates.

basal plates 1. (echinod: Crinoidea) A cycle of 5 aboral calyx plates in primitive stalked crinoids. see radial plates. 2. (NEMATA) The circular base of the cephalic framework, composed of an annular structure with posteriorly directed rim, the basal ring, and six radial elements.

basal platform (BRYO: Gymnolaemata) In Cheilostomata, the multizooidal skeletal layers of the basal zooidal walls; basal plate.

basal ring (NEMATA) The annular structure that extends posteriorly from the outer margin of the basal plate of the cephalic framework.

basal sclerites (ARTHRO: Insecta) In Diptera, two lateral, vertical lamellae uniting ventrally to form a trough that lodges the pharynx.

basal suture (ARTHRO: Insecta) In Isoptera, the line along which the wing separates from the body and shedding takes place.

basal window (BRYO: Gymnolaemata) In Cheilostomata, the subcentral, uncalcified section of an encrusting colony's exterior basal zooidal wall.

basal zooidal wall (BRYO) In Stenolaemata and Gymnolaemata, the interior or exterior zooidal supporting wall, normally parallel to the orificial wall.

base n.; pl. bases [L. basis, base] 1. The bottom of anything. 2. The main ingredient in anything that is a fundamental element or constituent. 3. The portion of a body to which an appendage or structure is attached. 4. (MOLL) The extremity opposite the apex of a shell spire.

basement membrane 1. The noncellular membrane underlying the epidermal cells of the body wall that separates it from the body cavity. 2. (ARTHRO: Insecta) Applied also to the inner surface of the eye; the basilemma.

basicarnal angle (ARTHRO: Crustacea) In Cirripedia, the intersection of the basal and median dorsal margins of the dorsal plate (tergum).

basicerite n. [Gr. basis, base; keras, horn] (ARTHRO: Crustacea) In Decapoda, the second segment of the antennal stalk of shrimp (Caridea) that bear flattened exopods.

basiconic peg (ARTHRO: Insecta) Sensory organs in the form of short hairs or pegs projecting above the general surface.

basicosta n. [L. basis, base; costa, rib] (ARTHRO: Insecta) The basal part of the coxa, as indicated by the basicostal suture. basicostal a.

basicostal suture (ARTHRO: Insecta) A strengthening ridge that indicates the external basal part of the coxa, the basi-costa.

basicoxite n. [L. basis, base; coxa, hip] (ARTHRO: Insecta) The narrow basal rim of the coxa.

basifemoral ring (ARTHRO: Chelicerata) In Acari, the suture in the basal segment of the femur, that separates the basi-and telofemur of the leg.

basifemur n. [L. basis, base; femur, thigh] (ARTHRO: Chelicerata) In Acari, a segmental division of the femur, separated from the telofemur by the basifemoral ring.

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