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12 results for “Lightiella”
Figure 2 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 2. Light and scanning electron micrographs of first and second antennae and labrum of Lightiella magdalenina sp. nov. A, 6-segmented first antenna. Scale bar = 70 µm. B, second antenna with 2-segmented protopod (Pr), 2-segmented endopod (En) and 19-segmented exopod (Ex). Scale bar = 80 µm. C, ventral view of labrum (Lb), which appears rounded anteriorly and acutely triangular posteriorly; second antenna (A2). Scale bar = 45 µm. D, detail of the postero-ventral surface of labrum (Lb) covered by thin setae randomly distributed (arrows). Scale bar = 3 µm. E, posterior view of cephalon separated by the remaining part of the body at the level of the second maxilla. First antenna (A1), second antenna (A2), labrum (Lb), unsegmented mandible (Md), first maxilla (M1). Scale bar = 10 µm.
Figure 1 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 1. Scanning electron micrographs of Lightiella magdalenina sp. nov. A, ventral view of an adult showing the horseshoe shaped cephalon (Ce), 9-segmented thorax (Th) with thoracopods 1–7 (T1-7) and reduced thoracopod 9 (T9), 11- segmented abdomen (Ab), including telson (TL). Scale bar = 300 µm. B, high magnification of segments 7–9 showing: segment 7 with pleura (PL) and limb (T7); segment 8 reduced and lacking pleura and limb (arrow); segment 9 with tergum reduced to a spine (Sp) and limb highly modified (T9). Scale bar = 14 µm. C, ventral view of the last portion of the abdomen showing the ventral comb on the telson (arrow) and caudal rami (Cr). Scale bar = 90 µm. D, dorsal view of telson characterized by two spinose processes with rounded edges (arrows); ventral comb (Vc). Scale bar = 10 µm.
Figure 3 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 3. Light and scanning electron micrographs of mandible and first maxilla of Lightiella magdalenina sp. nov. A, B, mandible with incisor process (Ip) bearing two teeth with one small seta in between (arrow) and molar process (Mp) with numerous small teeth. Scale bars: A, 35 µm; B, 2 µm. C, first maxilla with unsegmented protopodal gnathobase (Gb), 3-segmented endopod (En) and unsegmented exopod (Ex). Exopod bears 8 long plumose setae, one of which is broken (arrow). Scale bar = 10 µm. D, detail of the endopod showing the small seta on the inner corner of each segment and the two longer plumose setae of the last segment (arrow). Scale bar = 5 µm. E, F, detail of gnathobase bearing three indented spines and two plumose seta. Scale bars: E, 10 µm; F, 2 µm.
Figure 4. A, B in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 4. A, B, light micrographs of second maxilla (A) and thoracopod 5 (B) of Lightiella magdalenina sp. nov. showing the same morphological organization. Protopod (Pr) characterized by 6 enditic processes (Pe) and 1-segmented epipod (Ep) with 4 long plumose setae. 5-segmented endopod (En) and 2-segmented exopod (Ex) with a spine (S) that distinguishes the distal group of 4 long setae (arrow). Scale bars: A, 56 µm; B, 60 µm. C, high magnification of protopodal endites (Pe) armed with spines and setae. Scale bar = 25 µm. D, detail of the last two segments of endopod. Segment 4 characterized by the small seta on the inner corner (arrow) and 3 long setae on the outer corner. The last segment bears 4 claws, three of which are large and indented; the last one is small, smooth and located on the medial side of the base of the outermost claw (arrowhead). Scale bar = 15 µm.
Figure 2 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 2. Light and scanning electron micrographs of first and second antennae and labrum of Lightiella magdalenina sp. nov. A, 6-segmented first antenna. Scale bar = 70 µm. B, second antenna with 2-segmented protopod (Pr), 2-segmented endopod (En) and 19-segmented exopod (Ex). Scale bar = 80 µm. C, ventral view of labrum (Lb), which appears rounded anteriorly and acutely triangular posteriorly; second antenna (A2). Scale bar = 45 µm. D, detail of the postero-ventral surface of labrum (Lb) covered by thin setae randomly distributed (arrows). Scale bar = 3 µm. E, posterior view of cephalon separated by the remaining part of the body at the level of the second maxilla. First antenna (A1), second antenna (A2), labrum (Lb), unsegmented mandible (Md), first maxilla (M1). Scale bar = 10 µm.
Figure 5 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 5. Light and scanning electron micrographs of thoracopods 6, 7 and 9 of Lightiella magdalenina sp. nov. A, general view of thoracopod 6 with only one claw (arrow) on the distal endopodal segment. Scale bar = 58 µm. B, posterior surface of protopod of thoracopod 6 with genital pore (Gp). Scale bar = 5 µm. C, high magnification of genital pore showing the convex plug-like membrane (Pm) and the short thin setae (arrows) covering its lateral margin. Scale bar = 2 µm. D, general view of thoracopod 7 which appears similar to the preceding one, except for the reduced protopod characterized by only three enditic processes. Scale bar = 52 µm. E, detail of protopod of thoracopod 7 showing only three enditic processes (Pe). Scale bar = 14 µm. F, high magnification of thoracopod 9. Scale bar = 3 µm.
Figure 4. A, B in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 4. A, B, light micrographs of second maxilla (A) and thoracopod 5 (B) of Lightiella magdalenina sp. nov. showing the same morphological organization. Protopod (Pr) characterized by 6 enditic processes (Pe) and 1-segmented epipod (Ep) with 4 long plumose setae. 5-segmented endopod (En) and 2-segmented exopod (Ex) with a spine (S) that distinguishes the distal group of 4 long setae (arrow). Scale bars: A, 56 µm; B, 60 µm. C, high magnification of protopodal endites (Pe) armed with spines and setae. Scale bar = 25 µm. D, detail of the last two segments of endopod. Segment 4 characterized by the small seta on the inner corner (arrow) and 3 long setae on the outer corner. The last segment bears 4 claws, three of which are large and indented; the last one is small, smooth and located on the medial side of the base of the outermost claw (arrowhead). Scale bar = 15 µm.
Figure 3 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 3. Light and scanning electron micrographs of mandible and first maxilla of Lightiella magdalenina sp. nov. A, B, mandible with incisor process (Ip) bearing two teeth with one small seta in between (arrow) and molar process (Mp) with numerous small teeth. Scale bars: A, 35 µm; B, 2 µm. C, first maxilla with unsegmented protopodal gnathobase (Gb), 3-segmented endopod (En) and unsegmented exopod (Ex). Exopod bears 8 long plumose setae, one of which is broken (arrow). Scale bar = 10 µm. D, detail of the endopod showing the small seta on the inner corner of each segment and the two longer plumose setae of the last segment (arrow). Scale bar = 5 µm. E, F, detail of gnathobase bearing three indented spines and two plumose seta. Scale bars: E, 10 µm; F, 2 µm.
Figure 1 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 1. Scanning electron micrographs of Lightiella magdalenina sp. nov. A, ventral view of an adult showing the horseshoe shaped cephalon (Ce), 9-segmented thorax (Th) with thoracopods 1–7 (T1-7) and reduced thoracopod 9 (T9), 11- segmented abdomen (Ab), including telson (TL). Scale bar = 300 µm. B, high magnification of segments 7–9 showing: segment 7 with pleura (PL) and limb (T7); segment 8 reduced and lacking pleura and limb (arrow); segment 9 with tergum reduced to a spine (Sp) and limb highly modified (T9). Scale bar = 14 µm. C, ventral view of the last portion of the abdomen showing the ventral comb on the telson (arrow) and caudal rami (Cr). Scale bar = 90 µm. D, dorsal view of telson characterized by two spinose processes with rounded edges (arrows); ventral comb (Vc). Scale bar = 10 µm.
Figure 6. Majority–rule consensus tree from 8 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 6. Majority–rule consensus tree from 8 primary trees.
Figure 6. Majority–rule consensus tree from 8 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 6. Majority–rule consensus tree from 8 primary trees.
Figure 5 in A new species of the genus Lightiella: the first record of Cephalocarida (Crustacea) in Europe
Figure 5. Light and scanning electron micrographs of thoracopods 6, 7 and 9 of Lightiella magdalenina sp. nov. A, general view of thoracopod 6 with only one claw (arrow) on the distal endopodal segment. Scale bar = 58 µm. B, posterior surface of protopod of thoracopod 6 with genital pore (Gp). Scale bar = 5 µm. C, high magnification of genital pore showing the convex plug-like membrane (Pm) and the short thin setae (arrows) covering its lateral margin. Scale bar = 2 µm. D, general view of thoracopod 7 which appears similar to the preceding one, except for the reduced protopod characterized by only three enditic processes. Scale bar = 52 µm. E, detail of protopod of thoracopod 7 showing only three enditic processes (Pe). Scale bar = 14 µm. F, high magnification of thoracopod 9. Scale bar = 3 µm.
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