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EntomostracaEntomostraca En`to*mos"tra*ca, n. pl. [NL., fr. Gr. ? cut in
pieces + ? burnt clay, the hard shell of Testacea.]
(Zo["o]l.)
One of the subclasses of Crustacea, including a large number
of species, many of them minute. The group embraces several
orders; as the Phyllopoda, Ostracoda, Copepoda, and
Pectostraca. See Copepoda, Phyllopoda, and Cladocera. Entomostracan
Entomostracan En`to*mos"tra*can, a. (Zo["o]l.)
Relating to the Entomostraca. -- n. One of the Entomostraca.
Extracapsular
Extracapsular Ex`tra*cap"su*lar, a. (Anat.)
Situated outside of a capsule, esp. outside the capsular
ligament of a joint.
HolostracaPhyllopoda Phyl*lop"o*da, n. pl. [NL., fr. Gr. ? a leaf +
-poda.] (Zo["o]l.)
An order of Entomostraca including a large number of species,
most of which live in fresh water. They have flattened or
leaflike legs, often very numerous, which they use in
swimming. Called also Branchiopoda.
Note: In some, the body is covered with a bivalve shell
(Holostraca); in others, as Apus, by a shield-shaped
carapace (Monostraca); in others, like Artemia, there
is no carapace, and the body is regularly segmented.
Sometimes the group is made to include also the
Cladocera. Holostraca
Holostraca Ho*los"tra*ca, n. pl. [NL., fr. Gr. "o`los whole +
? shell of a testacean.] (Zo["o]l.)
A division of phyllopod Crustacea, including those that are
entirely covered by a bivalve shell.
Malacostraca
Malacostraca Mal`a*cos"tra*ca, n. pl. [NL., from Gr. ? soft +
? shell of a testacean.] (Zo["o]l.)
A subclass of Crustacea, including Arthrostraca and
Thoracostraca, or all those higher than the Entomostraca.
Malacostracan
Malacostracan Mal`a*cos"tra*can, n. (Zo["o]l.)
One of the Malacostraca.
MonostracaPhyllopoda Phyl*lop"o*da, n. pl. [NL., fr. Gr. ? a leaf +
-poda.] (Zo["o]l.)
An order of Entomostraca including a large number of species,
most of which live in fresh water. They have flattened or
leaflike legs, often very numerous, which they use in
swimming. Called also Branchiopoda.
Note: In some, the body is covered with a bivalve shell
(Holostraca); in others, as Apus, by a shield-shaped
carapace (Monostraca); in others, like Artemia, there
is no carapace, and the body is regularly segmented.
Sometimes the group is made to include also the
Cladocera. Pectostraca
Pectostraca Pec*tos"tra*ca, n. pl. [NL., fr. Gr. ? fixed + ?
shell of a testacean.] (Zo["o]l.)
A degenerate order of Crustacea, including the Rhizocephala
and Cirripedia.
PeriostracaPeriostracum Per`i*os"tra*cum, n.; pl. Periostraca. [NL.,
fr. Gr. ? around + ? shell of a testacean.] (Zo["o]l.)
A chitinous membrane covering the exterior of many shells; --
called also epidermis. ProostracaProostracum Pro*["o]s"tra*cum, n.; pl. Pro["o]straca. [NL.,
fr. Gr. ? before + ? shell of a testacean.] (Zo["o]l.)
The anterior prolongation of the guard of the phragmocone of
belemnites and allied fossil cephalopods, whether horny or
calcareous. See Illust. of Phragmocone. Tetracarpel
Tetracarpel Tet`ra*car"pel, a. [Tetra- + carpellary.] (Bot.)
Composed of four carpels.
ThoracostracaThoracostraca Tho`ra*cos"tra*ca, n. pl. [NL. See Thorax, and
Ostracoid, a.] (Zo["o]l.)
An extensive division of Crustacea, having a dorsal shield or
carapec? ??niting all, or nearly all, of the thoracic somites
to the head. It includes the crabs, lobsters, shrimps, and
similar species.
Meaning of Traca from wikipedia
