Buccopharyngeal armature see cephalopharyngeal skeleton

buccopharyngeal/salvary gland (MOLL: Gastropoda) In predacious Prosobranchia, a gland producing a sulfuric acid-containing secretion that is injected into its victim.

bucculla n.; pl. buccullae [L. dim. bucca, cheek] (ARTHRO: Insecta) One of two ridges on the underside of the head on either side of the beak or rostrum.

Bucephalus cercaria (PLATY: Trematoda) Larva of the furco-cercous group with the oral sucker on the midventral surface as in adults, with the tail arising from a large bulbous structure instead of a stem.

Buchner funnel A funnel with an interior perforated plate on which filter paper is placed that functions in vacuum filtration.

bud n. [ME. budde, bud] A young individual produced by budding, prior to detachment from the parent.

budding n. [ME. budde, bud] 1. The asexual reproduction of a new individual as the result of an outgrowth or bud from the parent organism. 2. (ARTHRO: Insecta) see colony fission.

buffered populations Populations of organisms affecting one another in such a way as to maintain a population density mean.

buffer species An alternative food for a predator, thereby, buffering the effect of the predator on its normal prey.

Bugel organ (ARTHRO: Insecta) A sense organ attached to the back of the tympanum, containing two scolopidia supported by an apodemal ligament and an invagination of the tympanal frame.

bulb n. [L. bulbus, a swelling] Any hollow globose organ.

bulbose, bulbous, bulbar a. [L. bulbus, a swelling] Pertaining to or resembling a bulb.

bulbus ejaculatorius (ARTHRO: Insecta) Ductus ejaculatorius. a. In some Hymenoptera, the swollen almost spherical structure. b. In Lepidoptera, the distal part. c. In Diptera, a muscled, syringe-like structure.

bulla n.; pl. bullae [L. bulla, bubble] 1. A rounded promi-nance, blister- or knob-like. 2. (ARTHRO: Crustacea) A structure secreted by the head and maxillary glands of certain parasitic female copepods that serves as an anchor for attachment to gill filaments of fish. 3. (ARTHRO: Insecta) a. Weakened spots on concave wings that allows them to bend. see stigma. b. In diaspid Hemiptera, located in the terminal outlet of wax glands (ceratuba) at the inner end. c. In scarabaeoid Coleoptera, a sclerite that closes the trachea. 4. (NEMATA: Secernentea) In Heteroderidae, knoblike structures within the vulval cone of cysts near the un-derbridge or fenestra.

bullate a. [L. bulla, bubble] Having a blister-like appearance, inflated, swollen.

bulliform a. [L. bulla, bubble; forma, shape] Bubble-shaped.

bundle n. [A.S. byndele, a binding] 1. A band or group fastened together. 2. A group of nerves, muscles or other fibers; a fasicle.

burden n. [A.S. byrthen, load] The total number of infectious parasites of an individual. see intensity.

burrow n. [uncert. origin] A hole or excavation used as a shelter and habitation, or place of retreat. see fossorial.

bursa n.; pl. bursae [L. bursa, purse] 1. Any pouch or sac, a sac-like cavity. 2. A lateral cuticular extension adanal, or surrounding the tail of male nematodes and acantho-cephalans that functions as claspers or guides during copulation; has also been applied by various workers to all caudal alae. 3. (ECHINOD: Crinoidea) In Ophiurida, formed by infoldings of the body wall of the oral disc to either side of the base of each arm, functioning in gas exchange or as bursal slits. see bursa copulatrix.

bursa copulatrix 1. A genital pouch of numerous invertebrates. 2. In certain male nematodes and acanthocepha-lans, a modified caudal ala or alae, circular or oval, may be divided into two lateral symmetrical or asymmetrical lobes, separated by a dorsal lobe, and supported by rays or pa pillae; bursa. 3. (ARTHRO: Insecta) A female copulatory pouch developed from the tubular vagina in the genital chamber for reception of the male aedeagus. see genital chamber. 4. (MOLL) A copulatory pouch or sac for receiving sperm that will be stored for only a brief period; copulatory bursa. see seminal receptacle. 5. (PLATY: Turbel-laria) In planarians, a blind pouch that holds the secretions from the penis and adenodactyl gland (muscular organ), which then activates the sperm.

bursal slits (ECHINOD: Crinoidea) Genital openings of the bursa of Ophiurida, through which water circulates for respiration, and ripe sex cells pass for fertilization or are retained as brood until rupture of the aboral disk. see ophio-pluteus.

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