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8 results for “Mesomyzostoma”
Figure 4 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 4. Mesomyzostoma lobus sp. nov. (A) Swollen oral disc of host crinoid Clarkcomanthus albinotus. (B) Oral disc dissected open, revealing coiled gut of host and emerging parts of a specimen or specimens of M. lobus sp. nov. (arrows). (C) Anterior end of holotype showing mouth and anterior gut (arrow) and first chaetiger (arrowhead). (D) Parts of a specimen or specimens live after extraction from the host. (E) Scanning electron micrograph view of a specimen fragment. (F) Micrograph of a parapodium digested in bleach showing the parapodial hook apparatus. Abbreviations: anc, anal cone of crinoid oral disc; ac, acicula; h, hook; m, mouth of crinoid oral disc; ma, manubrium; tr, central trunk from which lobes arise.
Figure 8 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 8. Phylogenetic relationships of the new Mesomyzostoma species: single most parsimonious tree resulting from the combined dataset alignment. Numbers above and below branches indicate support values> 50% obtained in the maximum likelihood (100 bootstrap pseudoreplicates) and maximum parsimony analyses (1000 jackknife replicates), respectively. An asterisk (*) indicates> 95% support for both analyses. There was low support for the relationships among the various Mesomyzostoma species and the maximum likelihood and maximum parsimony results showed some topological differences. Uncorrected pairwise distance percentage values for COI sequences for Mesomyzostoma species from different localities or with obvious divergences are given. These are specimens of M. botulus sp. nov. from Papua New Guinea and Australia, M. cf. reichenspergeri from Papua New Guinea (PNG) and Australia, M. lanterbecqae from PNG. Unfortunately COI comparisons were not possible between M. katoi (Japan) and M. cf. katoi (PNG) and between Mesomyzostoma B and M. lobus sp. nov. Hypomyzostoma fasciatum was used as outgroup in the analyses, but excluded from the figure.
Figure 7 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 7. Mesomyzostoma leukos sp. nov. (A) Remaining fragment of holotype fixed in formalin (SAM-E3408). (B) Micrograph of a parapodium from the holotype digested in bleach showing acicula and emergent hook. (C) Different view of same chaetal bundle showing acicula, hook and manubrium. Abbreviations: ac, acicula; h, hook; ma, manubrium.
Figure 3 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 3. Mesomyzostoma cf. reichenspergeri (Remscheid 1918). (A) Live specimen revealed when the oral disc was removed from the host. This specimen was partly in the oral disc and partly in the arm coelom. (B) Live specimen being dissected from oral disc. (C) Whole specimen showing five chaetigers and no cirri. (D) Scanning electron micrograph (SEM) view of entire individual showing low parapodia and external ciliation. Small arrows show four parapodia from chaetigers 1, 2, 4 and 5 (the third is not visible in the picture). (E) Detailed SEM view of anterior end and first parapodium, showing ciliation. (F) Micrograph of a parapodium digested in bleach showing acicula. (G) Micrograph of a parapodium digested in bleach showing the hook, replacement hook and acicula. Abbreviations: ac, acicula; c, cloaca; ci, cilia; h, hook; ma, manubrium; od, oral disc of crinoid host; p, parapodium; rh, replacement hook; m, mouth.
Figure 6 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 6. Mesomyzostoma botulus sp. nov. (A) Live adult being dissected from oral disc of host. (B) Juvenile stage with five chaetigers. (C) Juvenile stage with four visible chaetigers and possible everted pharynx. (D) Larger specimens in life, one on left adult holotype (SAM E3964) with possible everted pharynx. One on right paratype (SAM E3409), arrow pointing to emergent chaeta visible via scanning electron micrograph (SEM) in E. (E) SEM view of paratype (SAM E3409) showing only a single visible emergent chaeta. (F) Light micrograph of anterior end of juvenile specimen showing small hooks emerging from the body margin. (G) SEM view of smaller paratype on same stub (SAM E3409) also showing only single visible emergent chaeta on its cylindrical body. (H) Micrograph of a parapodium digested in bleach showing the acicula. (I) Micrograph of a parapodium digested in bleach showing the emergent hook. (J) Detailed SEM view of the single emergent hook of larger paratype on stub SAM E3409. Abbreviations: 1–5 refer to chaetigers; ac, acicula; ch, chaeta; h, hook; ma, manubrium; ph?, everted pharynx?
Figure 1. Mesomyzostoma katoi Okada, 1933 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 1. Mesomyzostoma katoi Okada, 1933. (A) Specimen alive, extracted from a pinnule of the crinoid host, Anneissia japonica. (B) Dorsal view of a complete specimen in life (SAM-E3407), showing the translucent margin. (C) Ventral view of an incomplete specimen in life (SAM-E3407), showing the digestive tube (through the translucent margin) and two chaetigers. (D) Scanning electron micrograph (SEM) side view of whole specimen (SIO-BIC A4072) showing the thin body section and the notched margin with small parapodia and the lack of cirri; lateral organs are evident on body margin as small slits. (E) SEM view of a hook emerging from a parapodium. (F) SEM close up of body margin showing lateral organs as small slits. (G) SEM lateral view of the anterior end, showing the mouth and first pair of very inconspicuous parapodia. Abbreviations: 1–5 refer to chaetigers; c, cloaca; ch, chaeta; dt, digestive diverticulae; lo, lateral organs; m, mouth; p, parapodium; pi, pinnule; sv, seminal vesicle; u, uterus.
Figure 2. Mesomyzostoma katoi Okada, 1933 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 2. Mesomyzostoma katoi Okada, 1933. (A) One-micrometre semithin section through body showing the single ventral nerve cord, a ventrolateral parapodium, central gut lumen, lateral gut diverticula spermatogonia/spermatids, spermatocysts and mature sperm in the vas deferens (SIO-BIC A4071). (B) Enlarged region of A showing the parapodium with its emergent hook as well as male reproductive cells. (C) Planktonic larval stage fixed in osmium tetroxide; the larva has two bundles of chaetae and an anterior ciliary ring (not visible). (D) Micrograph of a parapodium digested in bleach showing the parapodial hook apparatus. Abbreviations: ch, chaetae; dt, gut diverticulum; e, epidermis; m, muscle; p, parapodium; g, gut; h, hook; sc, spermatocycts; st, spermatogonia/spermatids; vd, vas deferens; vnc, ventral nerve cord.
Figure 5 in Four new species of Mesomyzostoma (Myzostomida: Annelida)
Figure 5. Mesomyzostoma okadai sp. nov. (A) Paratype (SIO-BIC A4080) in life. (B) Same specimen still partly inside arm of host crinoid. (C) Posterior end of paratype in A showing chaetigers 4 and 5, posterior cloaca and uterus, both filled with eggs. (D) Anterior end of paratype shown in A showing small first chaetiger, pharynx and digestive diverticulae. (E) Detailed scanning electron micrograph view of anterior margin of paratype (SIO-BIC A4086), showing lateral organs and low parapodia. (F) Micrograph of a parapodium digested in bleach showing the parapodial hook apparatus. Abbreviations: 1–5 refer to chaetigers; ac, acicula; c, cloaca; dt, gut diverticulae. go, arm gonad of host; h, hook; lo, lateral organ; ma, manubrium; pi, pinnule of host; u, uterus; ph, pharynx; m, mouth.
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