pentacrinoidadj.n.

Brit.

/pɛnˈtakrᵻnɔɪd/, U.S.

/pɛnˈtækrəˌnɔɪd/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Pentacrinus , -oid suffix.

Etymology: < scientific Latin Pentacrinus (see pentacrinite n.) + -oid suffix, perhaps after crinoid n.

Zoology.

A. adj.

Designating a larval stage of a crinoid at which it resembles a crinoid of the genus Pentacrinus in having a stalk and a calyx consisting of five plates.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [adjective] > belonging to or characteristic of Pelmatozoa > of or relating to Crinoidea > of or relating to or having characteristic of encrinites > allied to or resembling family Pentacrinidae

pentacrinoid1862

1862 Proc. Royal Soc. 12 427 Delicate sheaves of anastomosing calcareous trabeculæ shortly arise within these rings, and the series declares itself as the jointed stem of the pentacrinoid stage.

1877 T. H. Huxley Man. Anat. Invertebrated Animals ix. 551 A striking resemblance to the oral end of the young Pentacrinoid larva of Comatula.

1908 Geogr. Jrnl. 32 606 Yellow..is the colour of small specimens and of pentacrinoid young of comatulids.

a1933 J. A. Thomson Biol. for Everyman (1934) I. x. 173 Since a good living representative of the permanently stalked feather-stars is called Pentacrinus, the youthful fixed form of Antedon is described as the Pentacrinoid stage.

1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxi. 172/2 Comatulid crinoids lose the stalk after the pentacrinoid larval stage.

B. n.

A larval crinoid which resembles a crinoid of the genus Pentacrinus.

ΚΠ

1865 Philos. Trans. (Royal Soc.) 155 517 The capture of the specimen described by Sars in March would seem to indicate that the development of the Pentacrinoid of A. Sarsii extends over nearly a year.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 571 In the pentacrinoid, i.e. stalked Antedon.

1908 Amer. Naturalist 42 724 The pentacrinoids of Antedon bifida are sometimes pink, though usually, like the pentacrinoids of the other forms in which they are known, yellow.

1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxi. 171/1 A very late larva, beginning to demonstrate the adult pattern, in crinoids is known as the pentacrinoid, and in holothuroids as the pentactula.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online June 2022).

单词	pentacrinoid
释义	pentacrinoidadj.n. Brit. /pɛnˈtakrᵻnɔɪd/, U.S. /pɛnˈtækrəˌnɔɪd/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Pentacrinus , -oid suffix. Etymology: < scientific Latin Pentacrinus (see pentacrinite n.) + -oid suffix, perhaps after crinoid n. Zoology. A. adj. Designating a larval stage of a crinoid at which it resembles a crinoid of the genus Pentacrinus in having a stalk and a calyx consisting of five plates. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [adjective] > belonging to or characteristic of Pelmatozoa > of or relating to Crinoidea > of or relating to or having characteristic of encrinites > allied to or resembling family Pentacrinidae pentacrinoid1862 1862 Proc. Royal Soc. 12 427 Delicate sheaves of anastomosing calcareous trabeculæ shortly arise within these rings, and the series declares itself as the jointed stem of the pentacrinoid stage. 1877 T. H. Huxley Man. Anat. Invertebrated Animals ix. 551 A striking resemblance to the oral end of the young Pentacrinoid larva of Comatula. 1908 Geogr. Jrnl. 32 606 Yellow..is the colour of small specimens and of pentacrinoid young of comatulids. a1933 J. A. Thomson Biol. for Everyman (1934) I. x. 173 Since a good living representative of the permanently stalked feather-stars is called Pentacrinus, the youthful fixed form of Antedon is described as the Pentacrinoid stage. 1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxi. 172/2 Comatulid crinoids lose the stalk after the pentacrinoid larval stage. B. n. A larval crinoid which resembles a crinoid of the genus Pentacrinus. ΚΠ 1865 Philos. Trans. (Royal Soc.) 155 517 The capture of the specimen described by Sars in March would seem to indicate that the development of the Pentacrinoid of A. Sarsii extends over nearly a year. 1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 571 In the pentacrinoid, i.e. stalked Antedon. 1908 Amer. Naturalist 42 724 The pentacrinoids of Antedon bifida are sometimes pink, though usually, like the pentacrinoids of the other forms in which they are known, yellow. 1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxi. 171/1 A very late larva, beginning to demonstrate the adult pattern, in crinoids is known as the pentacrinoid, and in holothuroids as the pentactula. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online June 2022). < adj.n.1862
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