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14 results for “Haustoriidae”
Figure 5 in European species of Haustorius (Crustacea: Amphipoda: Haustoriidae), with description of a new Mediterranean species
Figure 5. Haustorius orientalis: pereiopod 6 (1); pereiopod 7 (2); coxa 2 (3); coxa 3 (4); telson (5). Scale bar: 100 mm.
Figure 6. Pereiopod 7 in European species of Haustorius (Crustacea: Amphipoda: Haustoriidae), with description of a new Mediterranean species
Figure 6. Pereiopod 7: Haustorius orientalis n. sp. (1); H. algeriensis from Bellan-Santini et al. (1989) (2); H. jayneae from Foster and LeCroy (1991) (3); H. canadensis from Bousfield (1960–61) (4); H. mexicanus from Ortiz et al. (2002) (5); H. arenarius from Sars (1895) (6).
Figure 3 in European species of Haustorius (Crustacea: Amphipoda: Haustoriidae), with description of a new Mediterranean species
Figure 3. Haustorius orientalis: lower lip (1); upper lip (2); maxilliped (3); gnathopod 1 (4); gnathopod 2 (5); maxilla 1 (6). Scale bar: 100 mm.
Figure 2 in European species of Haustorius (Crustacea: Amphipoda: Haustoriidae), with description of a new Mediterranean species
Figure 2. Haustorius orientalis: antenna 1 (1); antenna 2 (2); maxilla 2 (3); mandible (4); rostrum (5). Scale bar: 100 mm.
Figure 1 in European species of Haustorius (Crustacea: Amphipoda: Haustoriidae), with description of a new Mediterranean species
Figure 1. Haustorius orientalis, habitus. Scale bar: 1 mm.
Data from: Phylogeography of sand-burrowing amphipods (Haustoriidae) supports an ancient suture zone in the Gulf of Mexico
AIM: To evaluate the impact of a proposed ancient suture zone in the Gulf of Mexico on the distribution and molecular diversity of dispersal-limited, sand-burrowing amphipods of the genera Haustorius and Lepidactylus (Haustoriidae: Amphipoda). LOCATION: Gulf of Mexico, U.S.A. and Mexico. METHODS: Phylogenetic and population genetic analyses were performed using mitochondrial (COI and 16S) and nuclear (18S and 28S) data from 93 amphipod individuals from 16 sites across the Gulf of Mexico. Bayesian and ML phylogenies were constructed for all genes, divergence times were estimated using a molecular clock for COI (0.007–0.013 subs./site per My), and four species delimitation methods were used to identify operational taxonomic units (OTUs) within each amphipod species. The mitochondrial COI gene was used to construct haplotype networks and estimate population genetic parameters to evaluate historical changes in effective population sizes. RESULTS: Deep divergences (most estimated to be >4 Mya) were uncovered between sister clades of both amphipod genera on either side of the Mississippi River as well as within Lepidactylus triarticulatus where each sample site was found to harbor a unique genetic lineage. Two cryptic OTUs of L. triarticulatus were identified living sympatrically at Pass Christian, Mississippi. Two distinct OTUs representing western and eastern Haustorius galvezi clades were identified along the Texas and Mexico coastlines with abutting ranges. Population genetic results show some support for recent population expansions for western Gulf OTUs, while eastern Gulf OTUs may have suffered population bottlenecks in the past. MAIN CONCLUSIONS: Divergences between sister species of sand-burrowing amphipods exceeds the timing of previous vicariant hypotheses. The split appears to be consistent with Miocene sedimentation levels from the Mississippi River acting as an east-west barrier to gene flow in the Gulf of Mexico. Given their strong population structure and cryptic diversity, haustoriid amphipods are ideal model organisms for studying open coast biogeography.
Figure 4. Time-calibrated phylogeny from BEAST2 in Origin and evolution of the Haustoriidae (Amphipoda): a eulogy for the Haustoriidira
Figure 4. Time-calibrated phylogeny from BEAST2. Green diamonds represent calibration points: 1, closure of the Okefenokee Trough (1.75 Mya); 2, proposed migration to Europe by H. arenarius (~5 Mya); 3, Pontocaspian gammarid clade radiation (9–83 Mya); 4,Niphargidae–Pseudoniphargidae split (38–215 Mya); 5, Crangonyctidae-Pseudocrangonyctidae split (38–215 Mya).
Figure 3 in Origin and evolution of the Haustoriidae (Amphipoda): a eulogy for the Haustoriidira
Figure 3. Comparison of the BPP species tree (left) and the TNT-inferred morphological tree (right). Colours represent nominal genera; breaks in the colours between the trees represent species/genera placement discordances.
Figure 1. Phylogenetic hypotheses. A in Origin and evolution of the Haustoriidae (Amphipoda): a eulogy for the Haustoriidira
Figure 1. Phylogenetic hypotheses. A, basal gammarid hypothesis (Barnard & Drummond 1982); B, lysianassid hypothesis (Lowry & Myers 2017); C, convergent hypothesis; D, hypothesis of relationships within Haustoriidae (Sweet 1996); E, Haustorius galvezi; F, pereopod 6 article 5, arrow indicates taxonomically significant notch; G, maxilla 2 outer lobe compared to size of inner lobe (smaller, bottom).
Figure 5 in Origin and evolution of the Haustoriidae (Amphipoda): a eulogy for the Haustoriidira
Figure 5. Ancestral reconstructions for morphological traits using phytools. Illustrations from LeCroy (2002) and Hancock & Wicksten (2018). A, pleon overhangs urosome or not; B, pereopod 6 article 5 distal lobe present or absent. 'L. tri.' is short for Lepidactylus triarticulatus.
FIGURE 2 in Two new species of sand-burrowing amphipods of the genus Haustorius Müller, 1775 (Amphipoda: Haustoriidae) from the northwestern Gulf of Mexico
FIGURE 2. Map of representative localities of intertidal haustoriids in the Gulf of Mexico. VR) Veracruz, Mexico; GT) Galveston, TX; SR) Sea Rim State Park, TX; HB) Holly Beach, LA; GI) Grand Isle, LA; PC) Pass Christian, Mississippi; DI) Dauphin Island, AL; PB) Pensacola Bay, FL; SA) St. Andrews State Park, FL; GB) Grayton Beach, FL; CB) Carrabelle Beach, FL.
FIGURE 1. Characteristic differences between H in Two new species of sand-burrowing amphipods of the genus Haustorius Müller, 1775 (Amphipoda: Haustoriidae) from the northwestern Gulf of Mexico
FIGURE 1. Characteristic differences between H. galvezi sp. nov. and H. jayneae. A) Left is Haustorius galvezi sp. nov. and right is H. jayneae, curvature and girth of maxilliped outer plate; B) top is H. galvezi sp. nov. and bottom is H. jayneae, width vs. depth of gnathopod 1 coxa; C) top is H. galvezi sp. nov. and bottom is H. jayneae, shape of pereopod 7 coxa; D) top is H. galvezi sp. nov. and bottom is H. jayneae, cleft of telson. Drawings of H. jayneae from Foster & LeCroy (1991).
Data from: Phylogeography of sand-burrowing amphipods (Haustoriidae) supports an ancient suture zone in the Gulf of Mexico
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Figure 2 in Origin and evolution of the Haustoriidae (Amphipoda): a eulogy for the Haustoriidira
Figure 2. Maximum-likelihood phylogeny of Amphipoda from IQ-TREE.
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