. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 2. Structure and spination of the propod and dactyl of pereopod 7 as related to substratum type: A, cosmopolitan substrata (Caprclla lacriuscitla) ; B, starfish epibiont (C. gracilior) ; C, gorgonian epibiont (C. pcnaiitis) ; D, bryozoan epibiont (Paracaf>rcUa pitsilla) ; and E and F, free on the bottom (Alaycrcllo baiiksia and Perot ripus brci'is, respectively). close-set paxillae and lacking prominent pedicellaria. The aboral surface is covered with small spines arising from the paxillae. Space hetween the paxill
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 2. Structure and spination of the propod and dactyl of pereopod 7 as related to substratum type: A, cosmopolitan substrata (Caprclla lacriuscitla) ; B, starfish epibiont (C. gracilior) ; C, gorgonian epibiont (C. pcnaiitis) ; D, bryozoan epibiont (Paracaf>rcUa pitsilla) ; and E and F, free on the bottom (Alaycrcllo baiiksia and Perot ripus brci'is, respectively). close-set paxillae and lacking prominent pedicellaria. The aboral surface is covered with small spines arising from the paxillae. Space hetween the paxillae varies slightly as the starfish moves its arms. General morphology of C. gracilior in- cludes lack of prominent spination, sparse setation on the body and pereopods, the slender pereopods 5-7, and no true palmar development with a median grasping spine on the cylindrical propodi (Fig. 2B). Crawling is typical (Fig. IB) except that the substratum (starfish) is not en- circled by the pereopods. Predominant feeding mechanisms are scraping and filter-feeding, but predation occurs frequently. Filter-feeding is similar to other caprellids (Wetzel, 1932; Caine, 1974, 1976, 1977); swimming setae on the antennae passively filter settling material from the surrounding water. As observed, scraping is restricted to the capture of mucous secretions of the starfish and the settled material contained therein. Mucous capture occurs while the caprellid is stationary, but mucous strands are frequently located while the caprellid is crawling. Mucous strands are picked from the starfish with the first gnathopods, transferred to the maxillipeds and inner mouthparts, and ingested. If a small organism (<3 mm) swims between the laterally spread gnathopods II and the anteriorly directed antennae while C. gracilior is in an upright stance, capture occurs as both pairs of antenna flex ventrally concurrent with medial movement of gnathopods II. During medial movement, the gnathopods are rotated so t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
