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Annelida :: Annelida (n. pl.) A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the Chaetopoda, including the Oligochaeta or earthworms and Polychaeta or marine worms; and the Hirudinea or leeches. See Chaetopoda..

Solifugae :: Solifugae (n. pl.) A division of arachnids having large, powerful fangs and a segmented abdomen; -- called also Solpugidea, and Solpugides..

Proglottis :: Proglottis (n.) One of the free, or nearly free, segments of a tapeworm. It contains both male and female reproductive organs, and is capable of a brief independent existence..

Ectental :: Ectental (a.) Relating to, or connected with, the two primitive germ layers, the ectoderm and ectoderm; as, the ectental line or line of juncture of the two layers in the segmentation of the ovum..

Protosomite :: Protosomite (n.) One of the primitive segments, or metameres, of an animal..

Chlorophane :: Chlorophane (n.) The yellowish green pigment in the inner segment of the cones of the retina. See Chromophane.

Ectolecithal :: Ectolecithal (a.) Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova..

Mesoscutum :: Mesoscutum (n.) The scutum or dorsal plate of the middle thoracic segment of an insect. See Illust. of Butterfly.

Trilobite :: Trilobite (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment..

Scallop :: Scallop (v. t.) To mark or cut the edge or border of into segments of circles, like the edge or surface of a scallop shell. See Scallop, n., 2..

Micromere :: Micromere (n.) One of the smaller cells, or blastomeres, resulting from the complete segmentation of a telolecithal ovum..

Heeltap :: Heeltap (n.) One of the segments of leather in the heel of a shoe.

Segment :: Segment (n.) One of the parts into which any body naturally separates or is divided; a part divided or cut off; a section; a portion; as, a segment of an orange; a segment of a compound or divided leaf..

Protovertebra :: Protovertebra (n.) One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm..

Scutellum :: Scutellum (n.) The third of the four pieces forming the upper part of a thoracic segment of an insect. It follows the scutum, and is followed by the small postscutellum; a scutella. See Thorax..

Two-cleft :: Two-cleft (a.) Divided about half way from the border to the base into two segments; bifid.

Archiannelida :: Archiannelida (n. pl.) A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.

Triparted :: Triparted (a.) Divided nearly to the base into three segments or lobes.

Stylohyoid :: Stylohyal (n.) A segment in the hyoidean arch between the epihyal and tympanohyal.

Catadromous :: Catadromous (a.) Having the lowest inferior segment of a pinna nearer the rachis than the lowest superior one; -- said of a mode of branching in ferns, and opposed to anadromous..

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