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4 results for “Dentitheca”
FIGURE 3. Dentitheca dendritica A in Genetic and morphologic identities of hydrozoans (Cnidaria, Hydrozoa) from reef patches of Santa Marta, Colombian Caribbean
FIGURE 3. Dentitheca dendritica A. Basal part of polysiphonic hydrocaulus. Arrow indicates one of the channels. B. Apical part of the hydrocaulus. Oblique node that divides the hydrocaulus in sections. C. Lateral apophyses that support the hydrocladium. D. Hydrothecae in a hydrocladium with mobile lateral nematotheca. E. Mid-lower nematotheca. F. Cone- shaped nematotheca from the apophyses. G. Male gonotheca with gonophore.
FIGURE 4 in Medusoids in the life cycle of Dentitheca dendritica (Nutting, 1900) and Nemalecium gracile sp. nov. (Cnidaria: Hydrozoa)
FIGURE 4. Cnidome of Nemalecium gracile sp. nov. (A–D) and Nemalecium cf. lighti (Hargitt, 1924) from the Caribbean (E–H) and Indonesia (I–L): pseudostenoteles (A, E, I), microbasic mastigophores (B, F, J), microbasic euryteles (C, G, K), and unidentified rhopaloid heteronemes (D, H, L).
FIGURE 3 in Medusoids in the life cycle of Dentitheca dendritica (Nutting, 1900) and Nemalecium gracile sp. nov. (Cnidaria: Hydrozoa)
FIGURE 3. Nemalecium gracile sp. nov.—living colony (A) and hydranth (insert) showing the typical bright yellow tinge of the digestive region and the tentacles raised at different levels; fixed hydranth showing the hypostome (h.) encircled by the row of filiform tentacles (f.t.), the digestive (d.r.) and non-digestive (n.d.r.) regions, as well as ectodermic glandular cells (g.c.); detail of the non-digestive region (C) showing highly vacuolated endodermal cells; detail of a filiform tentacle showing large, endodermal chordal cells (D); insertion of the filiform tentacles (f.t.) around the hypostome, showing conspicuous glandular cells (g.c.) in between; nematodactyl (n.d.) armed with pseudostenoteles (p.s.) and filiform tentacles (f.t.) richly recovered with microbasic mastigophores (m.b.m.) (F); detail of a nematodactyl showing a discharged pseudostenotele (G); female (H) and male (I) gonothecae from dioecious stems; gonotheca and male gonophore, showing the blastostyle (b.) ending in an apical plate (a.p.) and budding off the gonophore, all being covered with a mantle (m.); the slightly eccentric spadix (s.) is distinguished from the mass of sperm cells (s.m.) through its darker tinge (J); male medusoid getting free from its mantle (m.), which remains attached to the blastostyle (b.) (K); newly released male medusoid (L), showing the conspicuous belt of refringent corpuscles (insert); fixed male medusoid seen with transmitted (M) and incident (N) light, showing the velar aperture (left) and the striated subumbrellar ectoderm; detail of the myoepithelial fibers of the subumbrellar ectoderm (O); slightly squashed preparation of a male medusoid showing the spadix (sp.) and a number of pseudostenoteles (p.s.) disseminated among the mass of gametes (P). Scale bars: 30 µm (O), 50 µm (D, E, G, and insert of L), 100 µm (F), 200 µm (P), 300 µm (C, J, M, N), 500 µm (A, B, K, L), 1 mm (H, I).
FIGURE 1 in Medusoids in the life cycle of Dentitheca dendritica (Nutting, 1900) and Nemalecium gracile sp. nov. (Cnidaria: Hydrozoa)
FIGURE 1. Dentitheca dendritica (Nutting, 1900)—fertile colony in situ (A); detail of a fertile branch showing arrangement of gonothecae (B); female (C, D) and male (E, F) gonothecae; female gonotheca seen with incident (G) and transmitted light (H), showing the terminal plate (t.p.) and the belt of refringent corpuscles (r.c.) of the medusoid; female medusoid releasing its oocytes within the gonotheca (I); eggs (e.) and developing embryo (d.e.) within the female gonotheca (J); medusoids still attached to the blastostyle after the release of the gametes in the water column (K–M). Scale bars: 100 µm (J), 200 µm (E–I, K–M), 400 µm (C, D), 2 mm (B), 3 cm (A).
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