Basilemma see basement membrane

basimandibula n. [L. basis, base; mandibulum, lower jaw]

(ARTHRO: Insecta) In Orthoptera, a narrow sclerite between the mandible and gena; a trochantin.

basimaxilla n. [L. basis, base; maxilla, upper jaw] (ARTHRO: Insecta) The basal maxillary sclerite.

basimetrical n. [Gr. basis, base; metrikos, of measuring] The vertical or horizontal distribution of organisms at the sea-bottom.

basinym n. [Gr. basis, base; onyma, name] The name upon which new names of species or higher classifications has been based. see isonym.

basioccludent angle (ARTHRO: Crustacea) In Cirripedia, the intersection of basal and occludent margins of the scutum.

basiophthalmite n. [Gr. basis, base; ophthalmos, eye] (ARTHRO: Crustacea) The proximal segment of the eyestalk, that articulates with the distal segment (podophthalmite) bearing the corneal surface of the eye.

basiperiphallus n.; pl. -li [Gr. basis, base; peri, around; phallos, penis] (ARTHRO: Insecta) In Protura, the basal ring of the periphallus, into which the acroperiphallus is sometimes retracted.

basipharynx n. [Gr. basis, base; pharynx, gullet] (ARTHRO: Insecta) The epipharynx and hypopharynx combined.

basipod(ite) n. [Gr. basis, base; pous, foot] 1. (ARTHRO: Insecta) The second segment of a telopodite; the first trochanter. 2. (ARTHRO: Crustacea) see basis.

basiproboscis n. [Gr. basis, base; proboskis, trunk] (ARTHRO: Insecta) In Diptera, the basal portion of the proboscis; the rostrum.

basipulvilli n.pl. [L. basis, base; pulvillus, small cushion] (ARTHRO: Insecta) In Diptera, the small lateral sclerite at the base of the pulvillus.

basirostral a. [L. basis, base; rostrum, bill] At the rostrum base.

basis n; pl. bases [L. basis, base] 1. A general term for the base of any appendage. 2. (ARTHRO: Crustacea) a. A proto-pod segment adjoining the coxa and carrying the exopod and endopod distally. b. The basipodite. c. A basal calcare ous or membranous plate functioning in anchorage of sessile barnacles to the substrate.

basiscopic a. [Gr. basis, base; skopein, to view] Looking toward the base. see acroscopic.

basiscutal angle (ARTHRO: Crustacea) Intersection of basal and scutal margins of the tergum in thoracic barnacles.

basisternum n. [L. basis, base; sternum, breastbone] (AR-THRO: Insecta) That part of a thoracic sternum anterior to the sternacostal suture and/or the sternal apophyses; ster-nannum; antesternite. see furcasternum.

basistylus n. [Gr. basis, base; stylos, pillar] (ARTHRO: Insecta) 1. In Diptera, the basal segment of the gonopods. 2. In Protura, the basal part of the stylus. see dististylus.

basitarsal ring (ARTHRO: Chelicerata) A suture separating the basitarsus and telotarsus of the legs; mesotarsal ring.

basitarsal scissure (ARTHRO: Chelicerata) A scissure separating the basitarsus and telotarsus of the leg.

basitarsus n.; pl. -si [Gr. basis, base; tarsos, flat of the foot] (ARTHRO) 1. The proximal division of a tarsus; the metatarsus. 2. In Chelicerata, separated from the telotarsus by the basitarsal ring or scissure. basitarsal a.

basitergal angle (ARTHRO: Crustacea) Intersection of the basal and tergal margins of the scutum of thoracic barnacles.

basitibial plate (ARTHRO: Insecta) In Apoidea, a small plate or scalelike projection at the base of the hind tibia.

basitrichous isorhiza, basitrich (CNID) Isorhizal nematocyst with spines at the base of the tube only.

basivalvula n.; pl. -lae [L. basis, base; dim. valva, fold] (ARTHRO: Insecta) A small sclerite at the base of the first val-vulae of the genitalia.

basopinacocytes n.pl. [Gr. basis, base; pinax, tablet; kytos, container] (PORIF) Cells that form the basal epithelium; in Corvomeyenia , a fresh-water sponge, they actively ingest and digest bacteria.

batatiform a. [L. batata, sweet potato; forma, shape] Resembling the shape of a sweet potato.

Batesian mimicry A form of deceptive mimicry in which a palatable species assumes the appearance of a species distasteful or poisonous to a predator; false warning color; allosematic color; pseudaposematic color. see Mullerian mimicry.

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