monotocardianadj.n.
/məˌnəʊtəʊˈkɑːdɪən/, U.S. /məˌnoʊdoʊˈkɑrdiən/ Zoology.
A. adj.
Designating or relating to prosobranch molluscs having only one gill and whose heart consists of one auricle and one ventricle (formerly placed in a suborder Monotocardia).
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [adjective] > of superorder Branchifera > belonging to order Prosobranchiata > belonging to order Pectinibranchiata > of member of Pectinibranchiata or Monotocardia
monotocardian1901
monotocardiac1902
1901 Q. Jrnl. Microsc. Sci. 44 258 It is fairly easy to derive the Monotocardian type of nervous system, radula, gill, and reproductive system from the corresponding organs of existing Diotocardia.
1958 J. E. Morton Molluscs vi. 109 We..show the general course of the circulation in the monotocardian prosobranch Struthiolaria.
1990 Jrnl. Molluscan Stud. 56 249/2 Only in neritomorph and monotocardian prosobranchs are internal fertilization, elaboration of pallial reproductive glands, and encapsulation of embryos expected.
B. n.
A monotocardian gastropod.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [noun] > superorder Branchifera > order Prosobranchiata > suborder Pectinibranchiata > member of
monotocardian1901
1901 Q. Jrnl. Microsc. Sci. 44 259 In the adult Monotocardian a single kidney alone is present.
1958 G. A. Kerkut Borradaile & Potts's Invertebrata (ed. 3) xv. 613 (caption) Heteropods..are pelagic monotocardians.
1971 Oxf. Bk. Invertebr. 36 Some archaeogastropods show the primitive features of paired gills within the mantle cavity... But others, the ‘monotocardians’,..have lost the second gill.
1988 Philos. Trans. (Royal Soc.) B. 319 33 The reproductive system approaches that of monotocardians in the length of the gonadial duct.
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022).
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adj.n.1901