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10 results for “Acanthobdellida”
Figure 6 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 6. Scanning electron micrographs of general morphology in small specimens. A, Acanthobdella peledina (4 mm; Alaska). B, Paracanthobdella livanowi (3.5 mm; Kamchatka). Single black arrows, anterior body region; double black arrows, posterior sucker. In the A. peledina specimen, some fragments of host tissue (white arrow) are still attached to the sucker.
Figure 9 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 9. Scanning electron micrographs of gonopores and posterior body regions. A, B, gonopores in a small Acanthobdella peledina (4 mm; Alaska; A) and a large Paracanthobella livanowi (11 mm; Kamchatka; B). C, D, the posterior body region for a medium-sized A. peledina (7 mm; Sweden; C) and a medium-sized P. livanowi (6 mm; Kamchatka; D). Double arrows indicate the posterior sucker; f, female gonopore; m, male gonopore; s, opening of the spermatheca. Dotted lines and Roman numerals denote segments.
Figure 4 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 4. Maximum likelihood phylogeny of Acanthobdellida (starred node). A, B, Majority rule consensus of 1000 bootstraps (log likelihood = −70 595.750). The entire phylogeny (A) shows Acanthobdellida as sister to Hirudinida (leeches). Taxa with multiple representative taxa are collapsed to triangles, with the length of the triangle corresponding to the maximum branch length from the base of the clade to the tips. The starred clade from A is expanded to show all Acanthobdellida individuals (B). The Alaskan (AK) and Nordic (NOR) Acanthobdella peledina populations form distinct clades. C–E, inset images show photographs of overall morphology of medium-sized specimens (C), scanning electron micrographs of the fifth row of chaetae (D) and silhouettes of chaetae from the first chaetal row (E). For all inset images, species are indicated using 'A' for A. peledina and 'P' for Paracanthobdella livanowi.
Figure 3 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 3. The chaetae of Acanthobdellida. Silhouettes show exemplary measurements of: A, chaetal length; B, chaetal breadth (from top to bottom) at the point of flexion, midsection (distal) and midsection (proximal); and C, flexion angle. Photographs, taken using a compound microscope, show: D, the chaetae of Acanthobdella peledina in the first segment; E, the chaetae of Paracanthobdella livanowi in the first segment; F, the chaetae of A. peledina in the fifth segment; and G, the chaetae of P. livanowi in the fifth segment. Scale bars: 35 µm (D–G).
Figure 2 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 2. Map of Acanthobdellida collecting records across their known distribution. Circles are records for Acanthobdella peledina, triangles are for Paracanthobdella livanowi. Red triangles and circles represent localities from the present study, with numbers corresponding to those in Table 2. Dark grey triangles and circles represent previously published records (from Kaygorodova et al., 2012; Utevsky et al., 2013; Kaygorodova & Dzyuba, 2018 and references therein).
Figure 1 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 1. Photographs of Acanthobdellida species. A, B, Acanthobdella peledina from two separate grayling [Thymallus thymallus (Linnaeus, 1758)] individuals in Scandinavia. C, A. peledina on Arctic grayling [Thymallus arcticus (Pallas, 1776)] from Alaska. Circles highlight A. peledina individuals on their hosts. D, a scanning electron micrograph of Paracanthobdella livanowi emphasizes the eponymous hooks we commemorate in the new common name: hook-faced fish worms.
Figure 5 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 5. General morphology of Acanthobdella peledina (A–C, E) and Paracanthobdella livanowi (D, F, G) visualized by stereo microscope. A–C, E, A. peledina: medium-sized specimen (7 mm; Sweden; A), large specimen (12 mm; Norway; B), very large specimen (25 mm; Finland; C); and anterior body region of specimen shown in B (E; note higher magnification). D, F, G, P. livanowi: small specimen (5 mm; Kamchatka; D), anterior body region of specimen figured in D (F; note higher magnification) and anterior body region of a large specimen (12 mm; Kamchatka; G). Arrow, anterior sucker; double arrows, posterior sucker; d, deepening between pairs of chaetae; Arabic numerals mark rows of chaetae.
Figure 8 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 8. Scanning electron micrographs showing details of the anterior body region. A, B, first and second rows of chaetae in small Acanthobdella peledina (5 mm; Sweden; A) and small Paracanthobdella livanowi (3.5 mm; Kamchatka; B). C, D, third, fourth and fifth rows of chaetae in medium-sized A. peledina (7 mm; Sweden; C) and P. livanowi (6 mm; Kamchatka; D). E, F, chaetae from the fifth row of medium-sized A. peledina (6 mm; Sweden; E) and medium-sized P. livanowi (6 mm; Kamchatka; F). Arrow indicates mouth opening; Arabic numerals 1–5 indicate rows of chaetae; c, putative chemoreceptors; d, deepening between pairs of chaetae.
Figure 7 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida
Figure 7. Scanning electron micrographs of the anterior body region. A, B, small specimens of Acanthobdella peledina (5 mm; Sweden; A) and Paracanthobdella livanowi (3.5 mm; B). C, D, large specimens of A. peledina (12 mm; Norway; C) and P. livanowi (11 mm; Kamchatka; D). In the large P. livanowi specimen, body segmentation and chaetae in the anterior sucker are barely visible. Arrow, mouth opening; Arabic numerals 1–5 indicate rows of chaetae; d, deepening between pairs of chaetae.
FIGURE 1 in New information on the distribution pattern of Acanthobdella peledina (Annelida, Acanthobdellida) in Eastern Siberia
FIGURE 1. Acanthobdella peledina of East Siberia. (A) The map of East Siberia with the exact geographic locations of the occurrence of A. peledina (highlighted with red dots), including the Angara River basin (green), the Lake Baikal basin (pink) and the Lena River basin (violet). (B) External appearance of the leech-like ectoparasite A. peledina biting on the dorsal fin of a Baikal black grayling. (C) The wound left after a bite: a lot of tissue disappeared from the dorsal fin.
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