mesotrochaladj.

Brit.

/mᵻˈsɒtrəkl/,

/ˌmɛsə(ʊ)ˈtrəʊkl/, U.S.

/məˈzɑtrək(ə)l/,

/ˌmɛzəˈtroʊk(ə)l/; see also meso- comb. form.

Origin: Formed within English, by derivation. Etymons: mesotrocha n., -al suffix¹.

Etymology: < mesotrocha n. + -al suffix¹.

Zoology.

Of a polychaete larva: having one or more rows of cilia encircling the middle of the body.

ΚΠ

1877 T. H. Huxley Man. Anat. Invertebrated Animals v. 248 The actively locomotive embryo of Sipunculus..resemble a Rotifer or a mesotrochal Annelidan larva.

1878 F. J. Bell & E. R. Lankester tr. C. Gegenbaur Elements Compar. Anat. 137 The larvæ of the Chætopoda are divided into mesotrochal, telotrochal, and polytrochal forms.

1940 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 6) 349 In some cases the pre-oral circlet is absent and the post-oral is situated about the middle of the body (mesotrochal), or there may be several between the mouth and anal end (polytrochal).

1991 Marine Biol. 111 255 The length of the compound prototrochal and mesotrochal cilia increased 5 and 2.5 times, respectively.

This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).

单词	mesotrochal
释义	mesotrochaladj. Brit. /mᵻˈsɒtrəkl/, /ˌmɛsə(ʊ)ˈtrəʊkl/, U.S. /məˈzɑtrək(ə)l/, /ˌmɛzəˈtroʊk(ə)l/; see also meso- comb. form. Origin: Formed within English, by derivation. Etymons: mesotrocha n., -al suffix¹. Etymology: < mesotrocha n. + -al suffix¹. Zoology. Of a polychaete larva: having one or more rows of cilia encircling the middle of the body. ΚΠ 1877 T. H. Huxley Man. Anat. Invertebrated Animals v. 248 The actively locomotive embryo of Sipunculus..resemble a Rotifer or a mesotrochal Annelidan larva. 1878 F. J. Bell & E. R. Lankester tr. C. Gegenbaur Elements Compar. Anat. 137 The larvæ of the Chætopoda are divided into mesotrochal, telotrochal, and polytrochal forms. 1940 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 6) 349 In some cases the pre-oral circlet is absent and the post-oral is situated about the middle of the body (mesotrochal), or there may be several between the mouth and anal end (polytrochal). 1991 Marine Biol. 111 255 The length of the compound prototrochal and mesotrochal cilia increased 5 and 2.5 times, respectively. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < adj.1877
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