pleopod


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pleopod

[′plē·ə‚päd]
(invertebrate zoology)
An abdominal appendage in certain crustaceans that is modified for swimming.
References in periodicals archive ?
Todd Zimmerman (NHMLAC) corrected this based on the form of the pleopod. Aside from the formation of the anterior carapace and the male pleopods, the two species are quite similar.
The group belongs to the crayfish subgenus Procericambarus (Fitzpatrick 1987), which possesses a strong angular shoulder on the cephalic surface at the base of the form I male pleopod's central projection, the central projection accounting for at least 35% of the total pleopod length.
Young and adult crabs were sorted according to the examination of secondary sexual characters, such as pleopod morphology, free abdomen and distinct cheliped development in adult male crabs as compared to young male and convex abdomen (forming an incubator chamber) in adult females.
with a CW < about 30 mm, was determined with a dissecting microscope to ascertain whether their pleopods bore setae and thus the crabs were females.
Serum protein index should never be used without simultaneously assessing molt stage by microscopic examination of pleopods (Lyle & MacDonald 1983), or potentially by pigment stage (Musgrove 2001) although the latter has only been validated in one species of spiny lobster (the Southern Rock Lobster, Jasus edwardsii).
As shown in other studies, female crab size was a strong predictor of egg-carrying capacity, which was strongly related to pleopod size and hence egg-carrying capacity.
Molt stage was determined through microscopic observation of the tip of one pleopod (Lyle and MacDonald, 1983).
Video observations indicated that, usually, nine short (each lasting 0.18 s) pleopod beat cycles were succeeded by one slow cycle (0.38 s, coincident with cleaning of the setal filter and transient slowdown of inhalant water velocity), resulting in a mean beat frequency of [1/(9 X 0.18 + 0.38)/10] = 5 Hz (i.e., one beat cycle lasts 1/5 = 0.2 s, in which both active and recovery strokes last 0.1 s).
Premolt animals were identified by the synthesis of new exoskeleton and by pleopod setal development (Aiken, 1973), and postmolt animals (2-10 days postmolt) were identified on the basis of records of the last molt.
The carapace width (CW) and carapace length (CL), the abdominal width (AW; measured at the junction between the fourth and fifth abdominal segment), the length of the propodus of the major cheliped (ChL), the length of the second right pleopod (2PL), and the length of the merus of the second and third left pereopod (first [1L] and second [2L] walking leg, respectively) of each crab were measured using an SPI 2000 series dial caliper (precision, 0.1 mm).
Remarks: The new species is included in Buchnerillo since it shows all the characters of the genus: small size; animal able to toll up into a perfect ball; endoantennal conglobation; dorsal surface tuberculated; cephalon with a wide frontal shield; pleonite 3 with epimera reduced; telson semicircular covering the uropods in dorsal view; antenna short and stout with a flagellum of three articles; male pleopod 2 with distal article flagelliform.