Actinopodan.

Brit.

/ˌaktᵻˈnɒpədə/, U.S.

/ˌæktəˈnɑpədə/

Origin: A borrowing from Latin. Etymon: Latin Actinopoda.

Etymology: < scientific Latin Actinopoda (see note) < ancient Greek ἀκτινο- actino- comb. form + scientific Latin -poda (see -pod comb. form).In sense 1 coined by H. Ludwig (1891, in Zeitschr. f. Wissensch. Zool. 51 605). In sense 2 coined by G. N. Calkins (see quot. 1909).

Zoology.

1. In Ludwig's classification: an order of holothuroid echinoderms having radial canals. rare. Now disused.

ΚΠ

1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 448 In the Actinopoda, they [sc. pseudohæmal canals] run the whole length of the body.

1906 E. W. MacBride in Cambr. Nat. Hist. I. xix. 570 Ludwig divides the group into two orders, Paractinopoda and Actinopoda, but the first includes only those forms which have lost the radial canals.

2. With plural (or occasionally singular) agreement: a phylum of amoeboid protozoans comprising the ‘radiolarians’ and heliozoans, characterized by a spherical body with radiating axopodia. Also with plural agreement: protozoans of this phylum (collectively or individually).Formerly regarded as a class, superclass, or subphylum, this group is probably polyphyletic and is still under review.

ΚΠ

1909 G. N. Calkins Protozoöl. i. 34 The Sarcodina..are here subdivided into two classes, the Rhizopoda and the Actinopoda, according as the pseudopodia are amorphous or ray-like.

1954 Q. Rev. Biol. 29 72/1 Whereas the group Actinopoda has long been recognized by protozoologists, raising it to a high rank distinct from other rhizopods and splitting the Radiolaria are perhaps novel.

1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) ii. 13/1 Actinopoda... Usually planktonic; often spherical; axopodia with microtubular stereoplasm.

1998 L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) ii. 186/1 ‘Radiolarians’ and other superficially similar plankton..are grouped as classes in the phylum Actinopoda for convenience and pedagogy.

Derivatives

actinoˈpodan adj. and n.

ΚΠ

1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 410 The body epithelium stretching across the radial region of the body wall of an actinopodan Holothurian.

1984 B. Nisbet Nutrition & Feeding Strategies Protozoa iii. 59 It contains a preponderance of ciliates.., with 35 phytomastigophorean flagellates, 30 zoomastigophorans, 29 rhizopodans and 7 actinopodans.

2002 P. Herring Biol. Deep Ocean App. 275 Radiolarians form a loose group of primarily planktonic actinopodans.

This entry has been updated (OED Third Edition, September 2009; most recently modified version published online December 2021).

单词	actinopoda
释义	Actinopodan. Brit. /ˌaktᵻˈnɒpədə/, U.S. /ˌæktəˈnɑpədə/ Origin: A borrowing from Latin. Etymon: Latin Actinopoda. Etymology: < scientific Latin Actinopoda (see note) < ancient Greek ἀκτινο- actino- comb. form + scientific Latin -poda (see -pod comb. form).In sense 1 coined by H. Ludwig (1891, in Zeitschr. f. Wissensch. Zool. 51 605). In sense 2 coined by G. N. Calkins (see quot. 1909). Zoology. 1. In Ludwig's classification: an order of holothuroid echinoderms having radial canals. rare. Now disused. ΚΠ 1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 448 In the Actinopoda, they [sc. pseudohæmal canals] run the whole length of the body. 1906 E. W. MacBride in Cambr. Nat. Hist. I. xix. 570 Ludwig divides the group into two orders, Paractinopoda and Actinopoda, but the first includes only those forms which have lost the radial canals. 2. With plural (or occasionally singular) agreement: a phylum of amoeboid protozoans comprising the ‘radiolarians’ and heliozoans, characterized by a spherical body with radiating axopodia. Also with plural agreement: protozoans of this phylum (collectively or individually).Formerly regarded as a class, superclass, or subphylum, this group is probably polyphyletic and is still under review. ΚΠ 1909 G. N. Calkins Protozoöl. i. 34 The Sarcodina..are here subdivided into two classes, the Rhizopoda and the Actinopoda, according as the pseudopodia are amorphous or ray-like. 1954 Q. Rev. Biol. 29 72/1 Whereas the group Actinopoda has long been recognized by protozoologists, raising it to a high rank distinct from other rhizopods and splitting the Radiolaria are perhaps novel. 1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) ii. 13/1 Actinopoda... Usually planktonic; often spherical; axopodia with microtubular stereoplasm. 1998 L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) ii. 186/1 ‘Radiolarians’ and other superficially similar plankton..are grouped as classes in the phylum Actinopoda for convenience and pedagogy. Derivatives actinoˈpodan adj. and n. ΚΠ 1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 410 The body epithelium stretching across the radial region of the body wall of an actinopodan Holothurian. 1984 B. Nisbet Nutrition & Feeding Strategies Protozoa iii. 59 It contains a preponderance of ciliates.., with 35 phytomastigophorean flagellates, 30 zoomastigophorans, 29 rhizopodans and 7 actinopodans. 2002 P. Herring Biol. Deep Ocean App. 275 Radiolarians form a loose group of primarily planktonic actinopodans. This entry has been updated (OED Third Edition, September 2009; most recently modified version published online December 2021). < n.1896
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