. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 392 JAN ROBERT FACTOR A. FIGURE 5. Second maxilla (left) of fourth-stage lobster, showing the inner (A) and outer (B) surfaces. (The number of plumose setae on the scaphognathite has been reduced slightly for clarity.) Abbreviations are: DBE, distal lobe of basal endite; PBE, proximal lobe of basal endite; DCE, distal lobe of coxal endite; PCE, proximal lobe of coxal endite; END, endopodite; SCA, scaphognathite; A, plumose setae; Bl, pappose setae; C2 and C4, plumo- denticulate setae; Fl, serrulate setae; and I, simple setae
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 392 JAN ROBERT FACTOR A. FIGURE 5. Second maxilla (left) of fourth-stage lobster, showing the inner (A) and outer (B) surfaces. (The number of plumose setae on the scaphognathite has been reduced slightly for clarity.) Abbreviations are: DBE, distal lobe of basal endite; PBE, proximal lobe of basal endite; DCE, distal lobe of coxal endite; PCE, proximal lobe of coxal endite; END, endopodite; SCA, scaphognathite; A, plumose setae; Bl, pappose setae; C2 and C4, plumo- denticulate setae; Fl, serrulate setae; and I, simple setae. Scale bar represents mm. bears on its outer surface a row of type Fl serrulate setae behind the medial edge. The two-segmented endopodite of the fourth stage bears typical pappose (Bl) and simple (I) setae as well as a clump of densely pappose (B2) setae near the base of the first segment. This is the only location where type B2 pappose setae were observed. The first maxilla of the first stage differs in several details. The most interesting of these involves the presence of rows of small, fine setules on the cuspidate (H2) setae of the basal endite. These setules are also present in the second and third stages. Here, as in several other instances to be noted below, the first, second, and third stage mouthparts have cuspidate setae with setules, while all of the cuspidate setae observed on the fourth stage mouthparts are simple. The endopodite of this appendage in the first three stages has only a single segment. The number of setae at the tip of the endopodite appears to undergo a reduction, as stages one, two, and three have three to five pappose (Bl) and plumo- denticulate (C2) setae in that position instead of the two found in the fourth stage. The clump of pappose (B2) setae, so obvious at the base of the fourth-stage endo- podite, is absent in the first two stages and represented by only three setae in stage three. Second maxillae. A bilobed coxal endite, a bilobed
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
