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25 results for “Streblospio”
Figure 2. Alien spionid polychaetes from Sukhum Bay, Black Sea. A in First occurrence of the invasive alien species Streblospio gynobranchiata (Rice & Levin, 1998) and Polydora cornuta Bosc, 1802 (Polychaeta: Spionidae) on the coast of Abkhazia (Sukhum Bay, Black Sea)
Figure 2. Alien spionid polychaetes from Sukhum Bay, Black Sea. A – general view of Streblospio gynobranchiata (female, length 6.35 mm), B,C – Polydora cornuta morphology (fifth chaetiger): major spines with tooth (at) and companion chaetae (bc). Scale bars: 10 μm.
Figure 1 in The population dynamics and reproduction of Streblospio gynobranchiata (Annelida, Spionidae), an alien polychaete worm, in the Sevastopol Bay (the Black Sea)
Figure 1. Seasonal dynamics of the average abundance of spionid polychaetes S. gynobranchiata in the innermost part of the Sevastopol Bay (2006–2007).
Figure 2 in The population dynamics and reproduction of Streblospio gynobranchiata (Annelida, Spionidae), an alien polychaete worm, in the Sevastopol Bay (the Black Sea)
Figure 2. Multi-annual dynamics of the average abundance of S. gynobranchiata in the Sevastopol Bay (2007–2013).
Figure 4. S in The population dynamics and reproduction of Streblospio gynobranchiata (Annelida, Spionidae), an alien polychaete worm, in the Sevastopol Bay (the Black Sea)
Figure 4. S. gynobranchiata: А, a body fragment of an egg-carrying female; В, a 3–chaetiger larva just hatched from egg capsule; С, a 3–chaetiger larva on the 2nd day; D, a 5–chaetiger larva equipped with anal cirri; E, a 9–chaetiger larva; F, a 13–chaetiger larva making a tube. Scale: А- F – 100 µm.
Figure 3 in The population dynamics and reproduction of Streblospio gynobranchiata (Annelida, Spionidae), an alien polychaete worm, in the Sevastopol Bay (the Black Sea)
Figure 3. Distribution of polychaete worms S. gynobranchiata (density in ind.·m-2) in the Sevastopol Bay: A – in 2007; B – in 2008; C – in 2013.
Figure 1 in First occurrence of the invasive alien species Streblospio gynobranchiata (Rice & Levin, 1998) and Polydora cornuta Bosc, 1802 (Polychaeta: Spionidae) on the coast of Abkhazia (Sukhum Bay, Black Sea)
Figure 1. Location of the stations where specimens of alien spionid polychaete were found.
Figure 5 in The population dynamics and reproduction of Streblospio gynobranchiata (Annelida, Spionidae), an alien polychaete worm, in the Sevastopol Bay (the Black Sea)
Figure 5. Adult worm (♂). Scale: 1 mm.
Figure 6 in The population dynamics and reproduction of Streblospio gynobranchiata (Annelida, Spionidae), an alien polychaete worm, in the Sevastopol Bay (the Black Sea)
Figure 6. Average abundance of S. gynobranchiata in Sevastopol Bay in May and in October 2013.
FIGURE 7. Streblospio eridani n in A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)
FIGURE 7. Streblospio eridani n. sp. a brooding structures. b oocytes along the body, and in a lateral row at each side of the body on anterior chaetigers. c oocytes inside the brooding structures. d posterior branched structures. e methyl green staining pattern (paratype MNHF I.AL.19.0002-9), ventrolateral view Abbreviations: bs, brooding structures; oo, oocytes; pbs, posterior branched structures. Scale bars: a = 20 µm; b-c = 100 µm; d = 30 µm; e = 0.5 mm.
FIGURE 6. Streblospio eridani n in A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)
FIGURE 6. Streblospio eridani n. sp. a anterior chaetigers, left lateral view. b hooded hooks with pairs of small teeth distal to the main tooth on posterior chaetigers, ventral view. c neuropod of middle chaetiger with granulated sabre chaeta, hooded hooks, and companion chaetae. d pygidium with one pair of very short ventral lappets, ventral view. Abbreviations: nt2, notopod of chaetiger 2; ch2, chaetiger 2; ch1, chaetiger 1; co, companion chaetae; sa, sabre chaeta; hh, hooded hooks; vl, ventral lappets. Scale bars: a = 10 μm; b = 2 μm; c-d = 10 μm.
FIGURE 3. Streblospio eridani n in A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)
FIGURE 3. Streblospio eridani n. sp. ciliated palps. a anterior region, with branchiae and palps, lateral view. b distal end of palp, frontal surface, lateral view. c detail of palp with cilia on frontal surface, latero-frontal view. d detail of frontal surface of ciliated palp, frontal view. Abbreviations: br, branchiae; pl, palps; fs, frontal surface; Lci, lateral cilia; Fci, frontal cilia, Lfc, latero-frontal cirri. Scale bars: a = 100 μm; b = 20 μm; c = 3 μm; d = 30 μm.
FIGURE 2. Streblospio eridani n in A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)
FIGURE 2. Streblospio eridani n. sp. a holotype (MNHF I.AL.19.0002-1), complete, dorsal view. b specimen lacking palps, with finger-like brooding structures (as the holotype), lateral view. c anterior region with prostomium and peristomium, frontodorsal view. d prostomium with prostomial papillae on the fronto-lateral surface (paratype MNHF I.AL.19.0002-33), and 2 pairs of eyes, dorsal view. Abbreviations: br, branchia; bs, brooding structures; dp, dorsal papilla like a small occipital antenna; pp, prostomial peaks (or sensory knobs). Scale bars: a = 1mm; b–c = 100 μm; d = 10 μm.
FIGURE 4. Streblospio eridani n in A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)
FIGURE 4. Streblospio eridani n. sp., ciliated branchiae. a anterior region with ciliated branchiae on chaetiger 1, dorso-lateral view. b detail of abfrontal surface, lateral view. c detail of ciliated branchiae, distal end, with distal digitiform appendage, dorsal view. d detail of ciliated branchiae and distal digitiform appendage, lateral view. Abbreviations: br, branchiae; cl, collar; ap, digitiform appendage; fs, frontal surface; as, abfrontal surface. Scale bars: a = 100 μm; b = 20 μm; c = 10 μm; d = 20 μm.
FIGURE 5. Streblospio eridani n in A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)
FIGURE 5. Streblospio eridani n. sp. a unilimbate anterior notocaetae; b unilimbate anterior neurochaetae. Scale bars: a-b= 10 μm.
FIGURE 8. Streblospio eridani n in A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)
FIGURE 8. Streblospio eridani n. sp. Phylogenetic reconstruction inferred from COI sequences calculated using the HKY+G evolutionary model. The numbers near the nodes indicate bootstrap values (> 50) (NJ/MP/ML). In bold is shown the sequences obtained in this study. The clade including S. eridani n. sp. sequences is marked in grey. Abbreviations: AL, Alabama USA; CA, California; FL, Florida USA; NC, North Carolina USA; SC, South Carolina USA; TX, Texas USA; VA, Virginia USA.
Data from: Consequences of a poecilogonous life history for genetic structure in coastal populations of the polychaete Streblospio benedicti
In many species, alternative developmental pathways lead to the production of two distinct phenotypes, promoting the evolution of morphological novelty and diversification. Offspring type in marine invertebrates influences transport time by ocean currents, which dictate dispersal potential and gene flow, and thus has sweeping evolutionary effects on the potential for local adaptation and on rates of speciation, extinction, and molecular evolution. Here we use the polychaete Streblospio benedicti to investigate the effects of dimorphic offspring type on gene flow and genetic structure in coastal populations. We use 84 single nucleotide polymorphism (SNP) markers for this species to assay populations on the East and West Coasts of the United States. Using these markers we found that in their native East Coast distribution, populations of S. benedicti have high population genetic structure, but this structure is associated primarily with geographic separation rather than developmental differences. Interestingly, very little genetic differentiation is recovered between individuals of different development types when they occur in the same or nearby populations, further supporting that this is a true case of poecilogony. In addition, we were able to demonstrate that the recently introduced West Coast populations (~100ya) likely originated from a lecithotrophic population near Delaware.
FIGURE 2 in New species of Dispio Hartman, 1951 and Streblospio Webster, 1879 (Polychaeta, Spionidae) from the coast of the Iberian Peninsula
FIGURE 2. Dispio elegans sp. nov. Holotype: (MNCNM 16.01/17913: A, B, I, J; paratype MNCNM 16.01/17915: C–H, K– Z): A) anterior region, dorsal view (Holotype); B) anterior region, lateral view (Paratype); C) parapodium of chaetiger 1; D) parapodium of chaetiger 2; E) parapodium of chaetiger 4; F) parapodium of chaetiger 7; G) parapodium of chaetiger 26; H) parapodium of chaetiger 44; I) dorsal organ of middle segments, dorsal view (Paratype); J) anterior parapodia, lateral view (Paratype); K) notopodial chaeta 2 of anterior row; L) notopodial chaeta 2 of posterior row; M) anterior notopodial chaeta of anterior row; N) anterior notopodial chaeta of posterior row; O) dorsal tuft notopodial chaeta of middle and posterior chaetigers; P) middle and posterior notopodial chaeta of anterior row; Q) middle and posterior notopodial chaeta of posterior row; R) neuropodial chaeta 1 of anterior row; S) neuropodial chaeta 2 of posterior row; T) unidentate neuropodial hooded hooks U) companion capillary neuropodial chaeta; V) middle neuropodial chaeta of posterior row; W) ventral tuft neuropodial chaetae of middle chaetiger; X) posterior neuropodial chaeta of posterior row; Y) ventral tuft neuropodial chaeta of posterior chaetiger; Z) Pygidium, dorsal view (Paratype); Z´schematic drawing of pygidium, frontal view (Ac: anal cushion; Do: dorsal organ; Pc: pygidial cirri, Scale. A–B, I, J, Z: 0.8 mm; C–H: 0.3mm, L–S, U–Yʹ; 0.05; T: 0.03).
FIGURE 1 in New species of Dispio Hartman, 1951 and Streblospio Webster, 1879 (Polychaeta, Spionidae) from the coast of the Iberian Peninsula
FIGURE 1. Geographical locations of Dispio elegans sp. nov. and Streblospio padventralis sp. nov. from the coast of the Iberian Peninsula
FIGURE 3 in New species of Dispio Hartman, 1951 and Streblospio Webster, 1879 (Polychaeta, Spionidae) from the coast of the Iberian Peninsula
FIGURE 3. Streblospio padventralis sp. nov. Holotype: (MNCNM 16.01/17907: E; paratype MNCNM 000: A–D, F–Q): A) anterior region, dorsal view; B) anterior region, latero-dorsal view; C) anterior region, ventral view; D) same anterior region showing prostomial ventral pad, ventral view; E) anterior region, lateral view; F) anterior region and chaetiger 1, lateral view; G) chaetiger 2, anterior view; H) parapodium of chaetiger 3; I) parapodium of chaetiger 7; J) parapodium of chaetiger 13; K) notopodial capillary chaeta; L) neuropodial capillary chaeta; M) sabre chaeta; N–N´) hooded hook in front and lateral view, respectively; O) companion chaeta; P) posterior region, dorsal view; Q) schematic drawing of inner brood chamber (Vp: ventral pad).
Lámina I. 1. Prostomio. 2. Papila prostomial (flecha). 3. Área de la inserción de las branquias y papila nucal (flecha). 4. Región anterior mostrando los palpos (pa) y branquias (br), vista ventrolateral. 5. Región anterior, vista dorsal y detalle del collar membranoso dorsal del setígero 2 (flecha). in Una nueva especie del género Streblospio Webster, 1879 (Annelida, Spionidae) procedente del sureste del golfo de Vizcaya A new species of the genus Streblospio Webster, 1879 (Annelida, Spionidae) from SE of Bay of Biscay
Lámina I. 1. Prostomio. 2. Papila prostomial (flecha). 3. Área de la inserción de las branquias y papila nucal (flecha). 4. Región anterior mostrando los palpos (pa) y branquias (br), vista ventrolateral. 5. Región anterior, vista dorsal y detalle del collar membranoso dorsal del setígero 2 (flecha).
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