exopodite

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exopodite

[ek′säp·ə‚dīt]
(invertebrate zoology)
The outer branch of a biramous crustacean appendage.
References in periodicals archive ?
Uropod with broad rami; exopod with two small spines at posterolateral angle and with distinct transverse suture; posterolateral projection of protopod terminally blunt.
homarus, information on the average length, number of setae in the apical segment of the 2nd maxilla and number of the exopod setae of each appendage were based on the illustrations reported by Radhakrishnan and Vijayakumaran (1995).
Second Maxilliped (Figure 2e): Endopod 5-segmented, distal segment ending in 1 strong distal and 2 sub-distal spines, sub-distal segment rounded distally with long serrulate setae; exopod absent.
Third Maxilliped: Endopod well developed, 5-segmented, segment distal with long setae rounding the distal margin and 2 long setae on the sub-distal margin; exopod with 3 pairs of long and plumose setae.
First and second Pereiopods: Endopod 5-segmented, completely developed, distal segment ending in a strong spine, dorsal and ventral sub-exopodal spines absent, coxal spine present but not elongated (disposition of setae as illustrated); exopod with 5 pairs of long and plumose setae.
Among eyestalkless animals, determination in the middle region (thorax) occurs later than in the head and tail region and is attained in exopods of the third and fourth pereiopods well before those of the first and second.
2] Pleopods setose (=Knowlton's stage IVA) A/B Antennal flagellum with 5 segments Antennule flagella as in stage IVA B Antennal flagellum with 9-16 segments, protopod with basicertie Antennular inner and outer flagellum segmented, peduncle with stylocerite (=Knowlton's stage IVB) B/C Exopods of pereiopods 1-4 setose Exopod of pereiopod 4 shortened [C.
30] (Table 2), exhibited most of the characteristics of Knowlton's stage IVC, but only the exopod of pereiopod 4 showed reduction in size and loss of swimming function.
The flagella of the Mxp2 and Mxp3 exopods form a well-defined functional gr oup having exactly the same function, and they almost always work together.
We agree with Schembri (1982a) in grouping together the Mxp2 and Mxp3 exopods, and the functions are identical: creating currents around the buccal field.
Labrum (Lb), mandibular incisor (Inc) and molar process (Mp), mandibular palp (Mdp), maxilla 1 coxa (Mxl cox), maxilla 1 basis (Mxl bas), maxilla 1 endopod (Mx1 endo), maxilla 2 coxa (Mx2 cox), maxilla 2 basis (Mx2 bas), maxilla 2 endopod (Mx2 endo), scaphognathite (Scapho), maxilliped 1 coxa (Mxpl cox), maxilliped 1 basis (Mxpl bas), maxilliped 1 endopod (Mxpl endo), maxilliped 1 exopod (Mxpl exo), maxilliped 1 epipod (Mxpl epi), maxilliped 2 endopod (Mxp2 endo), maxilliped 2 exopod (Mxp2 exo), maxilliped 3 endopod (Mxp3 endo), maxilliped 3 exopod (Mxp3 exo).
One of the third pair of pleopods was removed from each individual, and endopod and exopod width was measured with a pair of calipers to the nearest 0.