ผลต่างระหว่างรุ่นของ "หน้าหลัก"
ล |
Yarn1stream (คุย | มีส่วนร่วม) ล |
||
แถว 1: | แถว 1: | ||
− | + | 8 Anatomy from the torus stage of Micrura sp. "dark." a1-a2 and c1-c2 are confocal projections of larvae stained with phalloidin (white), and propidium iodide (orange). a1-a2 are transverse sections (from apical to vegetal), juvenile anterior is up. c1-c2 are frontal sections (from posterior to anterior, apical is up). a1. A 1.95 m slab displaying the developing proboscis (pb) and fused pairs of cephalic and trunk discs, forming the head (hd) and trunk rudiments (tr), respectively. a2. The exact same person as in a1. A 1.95 m slab showing the head and trunk rudiments fused around the gut, forming the characteristic toroid of juvenile tissue. The cerebral organ discs (cod) are closed off in the gut. Note the larval pore (pr), which is related with all the larval cirrus (not visible on this slab). b. A diagram summarizing a1- a2. c1. (outline in the gut omitted for clarity). A 1.95 m slab (frontal view) showing the apical organ and trunk rudiment. c2. A 1.95 m slab (frontal view) showing the proboscis rudiment, the cerebral organ discs closed off in the gut. d. A diagram summarizing c1-c2 (outline of your gut omitted for clarity). Scale bars 50 mposterior larval lobe --likely vestiges in the trunk disc invaginations [43] -- and in the course of metamorphosis, the M. alaskensis juvenile normally emerges caudal end 1st in that vicinity, at the base with the posterior lobe [10]. In the planktotrophic, sock-like pilidium recurvatum, there's a single larval pore in a corresponding position (posterior towards the mouth), and also the juvenile has been observed to emerge close to (possibly via) that pore, too [44]. Yet another similarity amongst the pilidium nielseni along with the standard planktotrophic pilidium is definitely the larval ciliary cirrus -- located, in pilidium nielseni, underneath the considerably decreased posterior lobe with the "pileus," and linked with its larval pore (Fig. 11a, c). Correspondingly, a short larval cirrus is found underneath the posterior larval lobe in quite a few standard planktotrophic pilidia ([10, 45], Maslakova, pers. obs., Fig. 11b, d]). Nonetheless, as a single could possibly imagine, there are actually some deviations from common pilidial development.1 in the most apparent differences in between the common pilidium and pilidium nielseni is lecithotrophy. Within a typical hat-like planktotrophic pilidium, the ciliary bands generate currents even though the lobes and lappets carry out specialized movements to capture unicellular algae [38]. Most likely, other kinds of planktotrophic pilidia, for instance the mitten-shaped pilidium auriculatum and sock-shaped pilidium recurvatum, have developed feeding mechanisms suited to their person morphologies [38]. The elaborate feeding structures and mechanisms expected by planktotrophic pilidia are, naturally, unnecessary for non-feeding pilidia, which begins to clarify their simplified physique plans. All described free-swimming non-feeding pilidia are uniformly ciliated, or have 1 or two circumferential ciliary bands of lengthy cilia as well as brief cilia covering the rest in the surface (e.g. [2, 12, 15, 22, 23]). TheyHunt and Maslakova Frontiers in Zoology (2017) 14:Page 12 ofaap pbcpb apgtvcgt prlclpcobam apdapgt gt pbco cocoFig. 9 Anatomy from the hood stage of Micrura sp. "dark." a-b are confocal projections of specimens stained with phalloidin (white) and propidium iodide (orange). Sagittal sections, apical plate (ap) up, juvenile anterior left. a. | |
− |
รุ่นแก้ไขเมื่อ 00:57, 7 กันยายน 2564
8 Anatomy from the torus stage of Micrura sp. "dark." a1-a2 and c1-c2 are confocal projections of larvae stained with phalloidin (white), and propidium iodide (orange). a1-a2 are transverse sections (from apical to vegetal), juvenile anterior is up. c1-c2 are frontal sections (from posterior to anterior, apical is up). a1. A 1.95 m slab displaying the developing proboscis (pb) and fused pairs of cephalic and trunk discs, forming the head (hd) and trunk rudiments (tr), respectively. a2. The exact same person as in a1. A 1.95 m slab showing the head and trunk rudiments fused around the gut, forming the characteristic toroid of juvenile tissue. The cerebral organ discs (cod) are closed off in the gut. Note the larval pore (pr), which is related with all the larval cirrus (not visible on this slab). b. A diagram summarizing a1- a2. c1. (outline in the gut omitted for clarity). A 1.95 m slab (frontal view) showing the apical organ and trunk rudiment. c2. A 1.95 m slab (frontal view) showing the proboscis rudiment, the cerebral organ discs closed off in the gut. d. A diagram summarizing c1-c2 (outline of your gut omitted for clarity). Scale bars 50 mposterior larval lobe --likely vestiges in the trunk disc invaginations [43] -- and in the course of metamorphosis, the M. alaskensis juvenile normally emerges caudal end 1st in that vicinity, at the base with the posterior lobe [10]. In the planktotrophic, sock-like pilidium recurvatum, there's a single larval pore in a corresponding position (posterior towards the mouth), and also the juvenile has been observed to emerge close to (possibly via) that pore, too [44]. Yet another similarity amongst the pilidium nielseni along with the standard planktotrophic pilidium is definitely the larval ciliary cirrus -- located, in pilidium nielseni, underneath the considerably decreased posterior lobe with the "pileus," and linked with its larval pore (Fig. 11a, c). Correspondingly, a short larval cirrus is found underneath the posterior larval lobe in quite a few standard planktotrophic pilidia ([10, 45], Maslakova, pers. obs., Fig. 11b, d]). Nonetheless, as a single could possibly imagine, there are actually some deviations from common pilidial development.1 in the most apparent differences in between the common pilidium and pilidium nielseni is lecithotrophy. Within a typical hat-like planktotrophic pilidium, the ciliary bands generate currents even though the lobes and lappets carry out specialized movements to capture unicellular algae [38]. Most likely, other kinds of planktotrophic pilidia, for instance the mitten-shaped pilidium auriculatum and sock-shaped pilidium recurvatum, have developed feeding mechanisms suited to their person morphologies [38]. The elaborate feeding structures and mechanisms expected by planktotrophic pilidia are, naturally, unnecessary for non-feeding pilidia, which begins to clarify their simplified physique plans. All described free-swimming non-feeding pilidia are uniformly ciliated, or have 1 or two circumferential ciliary bands of lengthy cilia as well as brief cilia covering the rest in the surface (e.g. [2, 12, 15, 22, 23]). TheyHunt and Maslakova Frontiers in Zoology (2017) 14:Page 12 ofaap pbcpb apgtvcgt prlclpcobam apdapgt gt pbco cocoFig. 9 Anatomy from the hood stage of Micrura sp. "dark." a-b are confocal projections of specimens stained with phalloidin (white) and propidium iodide (orange). Sagittal sections, apical plate (ap) up, juvenile anterior left. a.