maxilla

maxilla

Appendage next behind maxillule serving functions in feeding and respiration.

One of a pair of two sets gnathal appendages situated immediately posteroventral to mandibles.

One of a pair of two sets of appendages lying immediately posterior to the mandible.

One of two paired appendages in mouth region, posterior to (above in ventral view) mandible.

Paired appendage of 5th cephalic somite, used in feeding, often also in respiration.

Paired mouthpart appendages of the fourth and fifth cephalic somites.

Paired mouthparts used to filter food particles from the water. They are located immediately posterior to the mandibles and labia, and are usually laminar in form.

The third paired mouthpart and fifth cephalic appendage. In the Janiroidea, it consists of a basal segment bearing three setose lobes.

Third limb of cephalon, small, complex and membranous.

Fifth and last paired appendage of head. Typically absent, yet if present, then reduced to tiny lobe. Associated with opening of maxillary gland. (absent, rudimentary).

Fifth paired appendage of head; located between maxillules and first thoracopods. Associated with opening of maxillary gland. (with well-developed lobe, reduced, absent).

Fifth paired appendage of head; located between maxillules and first trunk appendages. If present, tiny, setose, and lobe-like. Associated with opening of maxillary gland. (vestigial, absent).

Fifth paired appendage of head; located between maxillules and first thoracopods. relatively small, reduced to simple lobe.

Fifth paired appendage of head (cephalon); located between maxillules and first thoracopods. Consists of protopod with five to six endites and large pseudepipod, six-segmented endopod, and two-segmented exopod.Basically biramous, although occasionally referred to as tri-, multi-, or polyramous due to numerous endites and pseudepipod.

Fifth paired appendage of head (cephalon); located between maxillules and first maxillipeds. Represents third pair of mouthparts and consists of base (protopod) with two endites as well as lateral flabellum (exopod).

Fifth paired appendage of head; located between maxillules and maxillipeds. Represents third pair of mouthparts and, if fully developed, consists of protopod bearing two endites. May be reduced to simple lobe. Mouthparts may be absent in male.

Third paired mouthpart on underside of head; borne on fifth cephalic segment (maxillar somite) and located between maxillule and first maxilliped. Typically consists of protopod, two endites, palp, and scaphognathite.

Fifth paired appendage of head (cephalon); located between maxillules and maxillipeds. Represents third pair of mouthparts. Relatively small, consisting of base and two endites.

Schematic representation of an isopod illustrating morphological terms.

C & E

Fifth pair of head appendages, functioning as mouthparts, immediately posterior to maxillules (=second maxillae).

Fifth paired appendage of head (cephalon); located between maxillules and maxillipeds. Represents third pair of mouthparts. Relatively small, consisting of base and two or three endites.

Fifth paired appendage of head; located between maxillules and maxilipeds. Represents third pair of mouthparts and consists of base bearing two to three endites, two-segmented endopod (palp), and exopod.

Third paired mouthpart on underside of head (cephalon); borne on fifth cephalic somite and located posterior and external to maxillules. Conists of four segments, the first being cylindrical, the others flattened; segments one and two with endites (that of second is bilobed). Bears opening of maxillary gland.

Fifth paired appendage of head (cephalon); located between maxillules and first pair of thoracopods. Represents third pair of mouthparts and, if fully developed, consists of proximal section with four endites as well as distal branches (endopod and exopod). Maxillary glands open at base of maxillae.

Paired appendage on underside of head between maxillules (suction discs) and first thoracopods. Uniramous, consisting of several spinose segments and terminal claw. Bears basal plate and opening of maxillary gland basally.

Balanus trigonus: oral cone, posterior view; and oral cone, lefft lateral view.

Third paired mouthpart on head. Consists largely of gnathobase; associated with openings of maxillary glands. (fused, not fused) (See also oral pyramid).

The fifth and last pair of cephalic appendages.

Fifth paired appendage of cephalon; located between maxillules and maxillipeds. Uniramous, consisting of protopod (with endites) and four-segmented shaft. Serves in locomotion and feeding.

Third paired mouthpart on underside of head; located between maxillules and maxillipeds. Uniramous, either setose and serving in suspension feeding, with terminal hooks/spines and serving as a raptorial organ, or arm-like and modified for attachment to host. Bears opening of maxillary gland basally. The term second maxilla is often preferentially applied.

Third paired mouthpart on underside of head (cephalon) posterior to maxillules. Uniramous, consisting of six or seven segments, and with main point of flexure between third and fourth segments. First two or three segments bear endites, the last bears terminal claw; all segments bear setae along inner margin. (prehensile, subchelate).

Fifth paired appendage of head; located between maxillules and maxillipeds or between maxillules and first thoracopods. Represents third pair of mouthparts and bears two to four endites.

Fifth paired appendage of cephalon; located between maxillules and maxillipeds. Represents third pair of mouthparts and consists of protopod bearing three endites, palp (endopod), and small lobe (exopod).

Fifth paired appendage of head (cephalon); located between maxillules and first thoracopods. Represents third pair of mouthparts and, if fully developed, consists of three-segmented base (protopod) with two endites as well as distal endopod (palp) and exopod. (foliaceous).

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