inequilateral


Also found in: Dictionary.

inequilateral

[in¦ē·kwə′lad·ə·rəl]
(biology)
Having the two sides or ends unequal, as the ends of a bivalve mollusk on either side of a line from umbo to gape.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Concha pequena, solida, trapezoidal, inequilateral con los umbos anteriores, los bordes dorsal posterior y ventral son casi paralelos, el borde anterior algo concavo en la region umbonal y redondeado en el resto, el borde posterior ampliamente redondeado; charnela con ligamento externo y un pequeno resilio, valva derecha con tres dientes cardinales,un lateral anterior y otro posterior, la valva izquierda con dos cardinales y dos laterales; escultura con 11 a 13 costillas radiales prominentes de aspecto nodular escamoso, los interespacios son anchos y algo profundos; periostraco pardo claro y color externo de la concha blanco amarillento, interior blanco a veces con manchas cafe y con los surcos producidos por la escultura externa, los bordes internos son crenulados.
Shell medium-sized to large (88.2 mm of maximum shell height and 120 mm of maximum shell length), equivalve, inequilateral, gibbose and very tumid.
The clearly recognized slight posterior wing makes the outline of the Protopleurobema shell very inequilateral. The hinges are nevertheless very similar in both, with cardinal teeth that are markedly pyramidal.
Leaflets chartaceous to papyraceous, inequilateral,
Hysterothecia single or gregarious, erumpent, superficial, straight to flexuous, surface usually striate, 0.4-2 x 0.2-0.4 mm; pseudoparaphyses hyaline, abundant, filiform, branched, longer than asci; epithecium compact; asci clavate to cylindrical, 8-spored, (55-)70-170 x 10-18 [micro]m; ascospores yellow-brown to reddish brown, uniseriate to partially biseriate, muriform, not parenchymatic, with [3-5(-7)] transverse and 1 longitudinal septa, ellipsoid to obovoid, sometimes slightly inequilateral, constricted at the median septum, (12-)15-24(-26) x (5-)6-10(-11) [micro]m.
Shell large and flat, rounded to oval, equivalve and inequilateral, similar to Anodonta, but with a solid, flat shaped and crenulated cardinal teeth on the right valve.
Shell large and flat, equivalve and inequilateral. Shape convex to oval, dorsal and ventral margins arched.
These structures are typical of highly deformed and metamorphosed sedimentary, volcanic and igneous rocks that experienced dislocation metamorphism under inequilateral pressure (stress).