Cap 17
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Cap 17

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; macronu-
cleus, two to many globular to ellipsoid nodules; 
micronucleus, present; contractile vacuole, present; 
cytoproct (?); feeding on bacteria, microalgae, and 
smaller protists; in marine and freshwater habi-
tats, including sand, and one species well-known 
ectocommensal on Hydra ; four genera. 
 \u2013 Kerona Müller, 1786 
 \u2013 Keronopsis Penard, 1922 
 \u2013 Paraholosticha Wenzel, 1953 
 \u2013 Parakeronopsis Shi, Song, & Shi, 1999 [nomen 
 Family PLAGIOTOMIDAE Bütschli, 1887 
 Size, medium; shape, laterally flattened, elongate-
ovoid, with right side slightly concave; free-
 swimming; somatic ciliation, holotrichous, dense, 
of small polykinetids or cirri with no differentia-
tion into cirral groups on either body surface ; 
oral ciliature of extensive adoral zone on its left 
side, coursing from apical end to subequatorial posi-
tion and then entering a deep oral cavity and with 
paroral and endoral along right wall of oral cavity; 
stomatogenesis, parakinetal; macronucleus, as an 
irregular bunch of nodules; micronuclei, several, 
relatively large; contractile vacuole, present; cyto-
proct (?); feeding on bacteria and organic matter in 
host\u2019s digestive system (?); in terrestrial habitats 
as an endocommensals solely in certain species 
of lumbricid oligochaete annelids ; one genus. 
 \u2013 Plagiotoma Dujardin, 1841 
 Family PSILOTRICHIDAE Bütschli, 1889 
 (syn. Psilotrichinae ) 
 Size, small to medium; shape, oval to elliptical 
in outline, with posterior spiny extensions in some 
species, and sometimes with zoochlorellae in cyto-
plasm; free-swimming; somatic ventral ciliature 
as long and sparse cirri in seven slightly curved 
cirral files with the postoral oblique cirral file 
developing from the anlage file IV ; frontal cirri; 
marginal cirri, strongly reduced; transverse cirri, 
present; caudal cirri, present; dorsal somatic cili-
ature as several files of monokinetids (?); peristo-
mial areal limited to anterior third of organism with 
oral ciliature typical of order, including paroral and 
endoral; macronucleus, two globular to ellipsoid 
nodules; micronucleus, present; contractile vacu-
ole, present; cytoproct (?); feeding (?); in freshwa-
ter and terrestrial habitats; one genus. 
 \u2013 Psilotricha Stein, 1859 
 \u2013 Hemiholosticha von Gelei, 1954 
 Family SPIROFILIDAE von Gelei, 1929 
 (syns. Atractidae , Chaetospiridae , Chaetospirina , 
 Chaetospirinae , Chaetospiroidea , Hypotrichidiidae , 
 Microspirettidae , Spiretellidae , Spirofilopsidae , 
 Stichotrichinae , Strongylidae , Strongylidiidae , 
 Strongylidiinae , Strongylidioidea ) 
 Size, small to medium; shape, varied, with some 
forms tailed and others more elongate at the ante-
rior end; free-swimming, but lorica produced by 
some species; somatic ventral ciliature as incon-
spicuous ventral cirri in files curved or spiralling 
obliquely around body, some ending on dorsal 
surface ; transverse cirri, present or absent; caudal 
cirri, present or absent; somatic dorsal ciliature as 
several dorsal files of bristle dikinetids in \u201cdor-
sal strip\u201d helically winding around the body ; 
adoral zone not highly prominent with oral cili-
ature typical of order and with paroral and endoral; 
macronucleus, globular to ellipsoid, single to sev-
eral nodules; micronucleus, present; contractile 
vacuole, present; cytoproct, likely present; feeding 
on bacteria, algae, and smaller protists; in marine 
and freshwater habitats, both benthic and plank-
tonic; 12 genera and one genus incertae sedis . 
 \u2013 Atractos Vörösváry, 1950 
 \u2013 Chaetospira Lachmann, 1856 
 \u2013 Hypotrichidium Ilowaisky, 1921 
17.3 The Ciliate Taxa to Genus 359
 \u2013 Microspiretta Jankowski, 1975 
 \u2013 Mucotrichidium Foissner, Oleksiv, & Müller, 1990 
 \u2013 Parastrongylidium Fleury & Fryd-Versavel, 1985 
 \u2013 Pelagotrichidium Jankowski, 1978 
 \u2013 Planitrichidium Jankowski, 1979 [nomen nudum] 
 \u2013 Spirofilopsis Corliss, 1960 
 \u2013 Stichotricha Perty, 1849 
 \u2013 Strongylidium Sterki, 1878 
 \u2013 Urostrongylum Kahl, 1932 
Incertae sedis in Family Spirofilidae 
 \u2013 Kahliela Tucolesco, 1962 
Incertae sedis in Order Stichotrichida 
 \u2013 Balladinopsis Ghosh, 1921 [nomen dubium] 
 \u2013 Klonostricha Jankowski, 1979 
 \u2013 Psilotrix Gourret & Roeser, 1888 
 \u2013 Stylonethes Sterki, 1878 [nomen dubium] 
 Order Sporadotrichida Fauré-Fremiet, 1961 
 (syn. Halteriina p.p ., Oxytrichina p.p ., Pleurotrichina 
p.p ., Sporadotrichorina ) 
 Size, small to large; shape, sometimes elongate, 
even tailed, but often oval to elliptical in outline; 
free-swimming; somatic ventral ciliature as fron-
toventral cirri, typically heavy and conspicuous, 
arranged in specific, localized frontal and ven-
tral groups, except in a few taxa (e.g., Family 
Halteriidae, Laurentiella , Onychodromus , and
 Styxophrya ); marginal cirri, typically present; 
transverse cirri, may or may not be present; caudal 
cirri, may or may not be present; dorsal somatic 
ciliature, typically as files of dikinetids with a 
single bristle cilium; oral ciliature as for subclass; 
stomatogenesis, apokinetal, usually with five or 
six anlagen streaks in two groups for differentia-
tion of ventral somatic ciliature ; in marine, fresh-
water, and terrestrial habitats, widely distributed, 
primarily benthic with some forms planktonic, 
others interstitial, and a few species symbiotic, 
either as ectocommensals on the integument or in 
the branchial cavity of several invertebrates or as 
intestinal inquilines of echinoids; three families. 
NOTE : Gene sequences of both actins and small 
subunit rRNA unambiguously place several genera 
of the Family Halteriidae (e.g., Halteria , Meseres ) 
close to the oxytrichid clade (Croft et al., 2003; 
Foissner et al., 2004; Hewitt et al., 2003). We have 
therefore transferred this family to this order from 
the Subclass Oligotrichia . We consider halteriids 
as planktonic descendants of this primarily benthic 
 Family HALTERIIDAE Claparède & Lachmann, 
 (syn. Meseridae [for Lieberkuehnidae ]) 
 Size, small; shape, spheroid to subovoid and 
conical; free-swimming, often darting through 
the water; somatic ciliature as somatic kinetids 
with long cilia (i.e., >10 µm long), often as 
cirrus-like \u201cbristles\u201d or stiff cilia ; oral cili-
ature, with the \u201ccollar\u201d as an \u201copen\u201d circle 
of apical oral polykinetids, the \u201clapel\u201d on the 
left side of the oral cavity, and only with the 
paroral (or endoral?) on the right side of the 
oral cavity; macronucleus, single, ellipsoid ; 
micronucleus, present; contractile vacuole, 
present; cytoproct (?); feeding on bacteria and 
microalgae; predominantly in freshwater habitats, 
typically planktonic but some in terrestrial habi-
tats; six genera and two incertae sedis . 
 \u2013 Cephalotrichium Meunier, 1910 (subj. syn. 
Strobilidium ) 
 \u2013 Halteria Dujardin, 1841 
 \u2013 Halterioforma Horváth, 1956 [ nomen oblitum ] 
 \u2013 Meseres Schewiakoff, 1893 
 \u2013 Pelagohalteria Foissner, Skogstad, & Pratt, 1988 
Incertae sedis in Family Halteriidae 
 \u2013 Jeannellia Tucolesco, 1962 (subj. syn. Halter-
ioforma ) 
 \u2013 Octocirrus Madhava Rao, 1929 [ nomen dubium ] 
 Family OXYTRICHIDAE Ehrenberg, 1830 
 (syns. Ancystropodiinae , Gastrostylidae p.p ., 
 Gastrostylina p.p ., Onychodromusidae , Oxytri-
chinae , Oxytrichoidea , Pattersoniellidae , Pleuro-
trichidae , Rigidotrichidae (?), Stylonychinae ) 
 Size, small to large; shape, relatively elongate; 
free-swimming; somatic ventral ciliature as fron-
toventral and transverse cirri, typically 18 in 
number, large and distinctive, scattered over 
mid-area of ventral surface, between right and 
left marginal cirral files, usually with three fron-
toventral cirri posterior to posterior vertex of the 
oral region, but several genera with conspicuous 
files of cirri (e.g., Laurentiella , Onychodromus ) ; 
360 17. The Ciliate Taxa Including Families and Genera
right and left marginal files of cirri, obvious;