| 释义 |
monotocardian|mənəʊtəʊˈkɑːdɪən|
[f. mod.L. name of suborder Monotocardia, f. mono- + Gk. ὠτό-ς gen. of οὖς auricle + καρδία heart.]
A prosobranch mollusc having only one auricle and one row of gill leaflets, belonging to the suborder Pectinibranchia, formerly called Monotocardia. Also as adj. So monotoˈcardiac a.
1901Q. Jrnl. Microsc. Sci. XLIV. 258 It is fairly easy to derive the Monotocardian type of nervous system, radula, gill, and reproductive system from the corresponding organs of existing Diotocardia. Ibid. 259 In the adult Monotocardian a single kidney alone is present. Ibid. 261 The monotocardian kidney. 1902Rep. Brit. Assoc. Adv. Sci. 630 Recent research..has resulted in proof that the dextral torsion which leads to the monotocardiac condition, does not affect all organs lying primitively to the left of the rectum. 1958G. A. Kerkut Borradaile & Pott's Invertebrata (ed. 3) xv. 613 (caption) Heteropods..are pelagic monotocardians. 1971Oxf. Bk. Invertebrates 36 Some archaeogastropods show the primitive features of paired gills within the mantle cavity... But others, the ‘monotocardians’,..have lost the second gill. |