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FIGURE 7 in Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches
No full textFIGURE 7. Pebble beach of Higashi-makado, Numazu City, Shizuoka Prefecture, where specimens of Metabetaeus lapillicola n. sp. were collected.Published as part of Yamashita, Ryunosuke, Komai, Tomoyuki & Kon, Koetsu, 2023, Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches, pp. 317-330 in Zootaxa 5258 (3) on page 327, DOI: 10.11646/zootaxa.5258.3.5, http://zenodo.org/record/778042
Rhinoecetes Just 1983
No full textGenus Rhinoecetes Just, 1983 [New Japanese name: Tsunoaruki-zoku]Published as part of Kodama, Masafumi, Ohtsuchi, Naoya & Kon, Koetsu, 2016, A new species of the genus Rhinoecetes Just, 1983 (Crustacea: Amphipoda: Ischyroceridae) from Japan, pp. 133-144 in Zootaxa 4169 (1) on page 135, DOI: 10.11646/zootaxa.4169.1.6, http://zenodo.org/record/26716
FIGURE 4. Metabetaeus lapillicola n in Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches
No full textFIGURE 4. Metabetaeus lapillicola n. sp., holotype, ovigerous female (cl 3.8 mm), CBM-ZC 17113. A, right mandible, outer view; B, same, dorsal view; C, same, ventral view; D, right maxillule, lateral view; E, right maxilla, lateral view; F, left maxilliped 1, lateral view; G, left maxilliped 2, lateral view H, left maxilliped 3, lateral view; I, same, ultimate segment, mesial view.Published as part of Yamashita, Ryunosuke, Komai, Tomoyuki & Kon, Koetsu, 2023, Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches, pp. 317-330 in Zootaxa 5258 (3) on page 323, DOI: 10.11646/zootaxa.5258.3.5, http://zenodo.org/record/778042
FIGURE 6. Metabetaeus lapillicola n in Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches
No full textFIGURE 6. Metabetaeus lapillicola n. sp., holotype, ovigerous female (cl 3.8 mm), CBM-ZC 17113. A, chela of major (left) cheliped (pereopod 1), flexor view; B, same, extensor view; C, chela of minor (right) cheliped (pereopod 1), flexor view; D, same, extensor view.Published as part of Yamashita, Ryunosuke, Komai, Tomoyuki & Kon, Koetsu, 2023, Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches, pp. 317-330 in Zootaxa 5258 (3) on page 325, DOI: 10.11646/zootaxa.5258.3.5, http://zenodo.org/record/778042
FIGURE 8 in Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches
No full textFIGURE 8. Phylogenetic tree for four species of Metabetaeus and Salmoneus aduncus Komai, 2022 used as an outgroup taxon; obtained by ML analysis of 16S rRNA gene sequences using the TIM3+I substitution model. The best tree with the highest log likelihood (-1856.260992) is shown. Bootstrap values of higher than 70% are indicated at nodes as percentage values. There was a total of 386 bp in the final dataset trimmed with Gblocks.Published as part of Yamashita, Ryunosuke, Komai, Tomoyuki & Kon, Koetsu, 2023, Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches, pp. 317-330 in Zootaxa 5258 (3) on page 327, DOI: 10.11646/zootaxa.5258.3.5, http://zenodo.org/record/778042
FIGURE 5. Metabetaeus lapillicola n in Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches
No full textFIGURE 5. Metabetaeus lapillicola n. sp., holotype, ovigerous female (cl 3.8 mm), CBM-ZC 17113. A, major (left) cheliped (pereopod1), lateral view; B, minor (right) cheliped (pereopod 1), lateral view, C, left pereopod 2, lateral view; D, right pereopod 3, lateral view; E, same, distal part of propodus and dactylus, lateral view; F, left pereopod 4, lateral view; G, same, distal part of propodus and dactylus, lateral view; H, left pereopod 5, lateral view; I, same, distal part of propodus and dactylus, lateral view.Published as part of Yamashita, Ryunosuke, Komai, Tomoyuki & Kon, Koetsu, 2023, Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches, pp. 317-330 in Zootaxa 5258 (3) on page 324, DOI: 10.11646/zootaxa.5258.3.5, http://zenodo.org/record/778042
Metabetaeus Borradaile, 1899: 1899
No full textKey to species of Metabetaeus 1. Carapace with pterygostomial spine; chelipeds greatly unequal and dissimilar with major one noticeably elongate; uropodal endopod unarmed or at most with rudimentary tooth on distolateral margin........................ M. lapillicola n. sp. - Carapace without pterygostomial spine; chelipeds subequal and similar; uropodal endopod with conspicuous tooth on distolateral margin............................................................................................. 2 2. Corneas developed; pereopods 2 and 3 propodi each with 1 or 2 minute spiniform seta(e) or unarmed on flexor margin............................................................................................ M. mcphersonae - Corneas reduced; pereopods 2 and 3 propodi each with numerous spiniform setae on flexor margin.................... 3 3. Cheliped fingers shorter than palm, not curved...................................................... M. minutus - Cheliped fingers longer than palm, more or less curved............................................... M. lohenaPublished as part of Yamashita, Ryunosuke, Komai, Tomoyuki & Kon, Koetsu, 2023, Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches, pp. 317-330 in Zootaxa 5258 (3) on page 328, DOI: 10.11646/zootaxa.5258.3.5, http://zenodo.org/record/778042
FIGURE 3 in A new species of the genus Rhinoecetes Just, 1983 (Crustacea: Amphipoda: Ischyroceridae) from Japan
No full textFIGURE 3. Rhinoecetes spinicaudus sp. nov. Holotype (NSMT-Cr 24583, male, 6.9 mm). A, right antenna II flagellum (setae omitted), flexor view; B, C, head, lateral (B) and dorsal view (C). Scale bars: 0.5 mm.Published as part of Kodama, Masafumi, Ohtsuchi, Naoya & Kon, Koetsu, 2016, A new species of the genus Rhinoecetes Just, 1983 (Crustacea: Amphipoda: Ischyroceridae) from Japan, pp. 133-144 in Zootaxa 4169 (1) on page 138, DOI: 10.11646/zootaxa.4169.1.6, http://zenodo.org/record/26716
Ocean acidification drives community shifts towards simplified non-calcified habitats in a subtropical?temperate transition zone
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Metabetaeus Borradaile 1899
No full textGenus <i>Metabetaeus</i> Borradaile, 1899 <p> <i>Metabetaeus</i> Borradaile, 1899: 1014.— Holthuis 1993: 204.— Anker 2010: 38.</p> <p> <b>Type species.</b> <i>Betaeus minutus</i> Whitelegge, 1897, by monotypy.</p> <p> <b>Composition.</b> In addition to the type species, the following three species are now assigned to <i>Metabetaeus</i>: <i>M. lohena</i> Banner & Banner, 1960, <i>M. mcphersonae</i> Anker, 2010 and <i>M. lapillicola</i> n. sp.</p> <p> <b>Emended diagnosis.</b> Body moderately slender, not particularly compressed. Carapace smooth, glabrous, frontal margin with rostrum and orbital spines; posterior margin with deep cardiac notch. Pleomere 6 without articulated plate at posteroventral angle. Telson sub-rectangular, slightly tapering posteriorly; dorsal surface with 2 pairs of strong spiniform setae; posterior margin straight to rounded medially, each lateral angle with 2 pairs of strong spiniform setae; anal tubercles absent. Eyestalks completely concealed in dorsal and lateral views, but visible in anterior view; corneas more or less reduced, located in lateral position of eyestalk. Antennular peduncle with elongated and distally acute stylocerite; Lateral antennular flagellum with well-developed secondary ramus. Antennal peduncle with basicerite bearing strong ventrolateral distal spine. Scaphocerite with distinct distolateral spine and lamella. Mandible with two-segmented palp, with prominent dark-brown spot on incisor process. Maxilliped 3 pediform; lateral plate of coxa not acutely produced; ultimate article with small spiniform seta sub-distally. Pereopods 1 (= chelipeds) carried extended with dactylus in lateral position; carpus subcylindrical to vase-shaped, without comblike setal rows mesially; chela simple, smooth; linea impressa and adhesive discs absent; occlusal margins of fingers without snapping mechanism, unarmed or armed with simple teeth. Pereopod 2 with five-segmented carpus, first segment longest, third segment longer than second or fourth. Pereopods 3 and 4 slender; ischium usually with 1 or 2 spiniform seta(e) on lateral surface ventrally; merus usually with 1–3 spiniform seta(e) on lateral surface ventrally; propodus unarmed or armed with small spiniform setae ventrally; dactylus simple, acute distally, with minute setae subdistally. Male pleopod 2 with appendix masculina distinctly longer than appendix interna; female pleopod 2 with appendix interna only. Uropodal exopod with diaeresis bearing large subtriangular tooth adjacent to strong distolateral spiniform seta; endopod unarmed or with a tooth on distolateral margin.</p>Published as part of <i>Yamashita, Ryunosuke, Komai, Tomoyuki & Kon, Koetsu, 2023, Metabetaeus lapillicola, a new species of alpheid shrimp (Decapoda: Caridea) from Japan, inhabiting unusual pebble beaches, pp. 317-330 in Zootaxa 5258 (3)</i> on page 328, DOI: 10.11646/zootaxa.5258.3.5, <a href="http://zenodo.org/record/7780429">http://zenodo.org/record/7780429</a>
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