Ampelisca moreirai
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Ordo: Amphipoda
Familia: Ampeliscidae
Genus: Ampelisca
Name
Ampelisca moreirai Valério-Berardo, Maria Teresa, 2006 – Wikispecies link – Pensoft Profile
- Ampelisca moreirai Valério-Berardo, Maria Teresa, 2006, Zootaxa 1286: 8-13.
Materials Examined
Material examined: holotype, female, 7.7 mm, 25 ° 35 ’S – 46 °03’W, 136 m, mud and broken shell, R/V W. Besnard col., 29 /05/ 71, MZUSP16841. Paratypes: 25 ° 13 ’S – 47 ° 29 ’W, 32 m, fine sand, R/V W. Besnard col., 18 /06/ 70, MZUSP16843, 1 male; 23 °03’S – 42 ° 19 ’W, 75 m, fine sand, R/V W. Besnard col. 05/06/ 70, MZUSP16842, 2 females; 25 ° 46 ’S – 46 ° 30 ’W, 136 m, fine sand, R/V W. Besnard col. 20 /06/ 70, MNRJ19653, 2 specimens; 29 ° 33 ’S – 48 ° 46 ’W, 118 m, mud and broken shell, R/V W. Besnard col., 25 / 06/ 70, MNRJ19654, 2 specimens.
Etymology
Etymology: This species is named in recognition to Dr. Plinio Soares Moreira (Instituto Oceanográfico/ Universidade de São Paulo) for his innumerous contributions and dedication to marine benthic projects along the Brazilian coast.
Diagnosis
Diagnosis: Head with antero ventral margin oblique. Antenna 1 shorter than antenna 2 peduncle. Antenna 2 shorter than body length. Coxa 1 with a notch on posteroventral corner and distally widened. Pereopod 7, basis with plumose setae on ventral margin; merus posterodistal lobe extending 1 / 3 of propodus, lobe margin with long plumose setae; anterior margin of carpus with two robust setae; propodus longer than carpus, 2.2X longer than wide; dactylus shorter than propodus. Epimeron 3 posteroventral corner rounded. Urosomite 1 dorsal margin produced posteriorly into a pointed carina upturned. Uropod 2 outer ramus with a long distal robust seta. Uropod 3 inner ramus wider and longer than outer ramus with setae along inner and distal margins; outer ramus with setae along outer margin. Telson deeply cleft apices lobes with 2 pair of setae.
Description
Description: Holotype, female 7.7 mm. Head shorter than first 3 body segments combined, with antero ventral margin oblique. Ventral pair of the eyes at antero ventral corner of head. Antenna 1 shorter than antenna 2 peduncle, peduncular article 2 longer than article 1 and 3, without setae on ventral margin, flagellum of 5–7 articles. Antenna 2 shorter than body length, peduncular article 4 length subequal to article 5, flagellum with 8–9 articles. Left mandible with 9 accessory blades; mandibular palp article 2 slightly longer than article 3, not inflated, inner and outer margins with long simple setae, article 3 length 0.8X of article 2 with subapical and apical setae. Maxilla 1 inner plate with 2 apical setae, outer plate with 10 setalteeth; palp aticle 2 with 3 distal cusps accompanied by 3 robust setae and 8 facial setae. Maxilliped inner lobe rectangular distally with 8 distal plumose setae; outer lobe reaching halfway of palp article 2, bearing 9 chieselshaped robust setae along margin; palp article 3 not clavate. Upper lip, lower lip and maxilla 2 with basic characters for the genus. Coxae 1–4 longer than broad. Coxa 1 and 2 with marginal row of plumose setae on ventral margins. Coxa 1 with a notch on posteroventral corner and distally widened. Gnathopod 1 basis posterior and anterior margins with a row of long simple setae; ischium and merus with setae on posterior margin; carpus 1.2X propodus length, both posterior margins with plumose setae; dactylus slightly curved. Gnathopod 2 slender than gnathopod 1, basis with few long setae on both margins, carpus elongate about 2.2X propodus length with long setae on posterior margin; propodus slender with plumose setae on posterior margin and simple setae on anterior margin; dactylus short, not curved, bearing 4 setules along inferior margin. Pereopod 3 and 4 similar in shape but the fourth is slightly more massive than third, both with elongate dactylus about 1.5X carpus and propodus length combined. Pereopod 3 merus with plumose setae along 2 / 5 posterior margin and apical long plumose setae on anterior margin, anterodistal corner produced. Pereopod 4 basis both margins with long simple setae; merus both margins with plumose setae, and about 2.7X as long as broad. Pereopod 5 basis subovoid, anterior margin with a row of setae; carpus length subequal to propodus and produced posterodistally, bearing 2 long setae and 2 short robust setae, posterior margin with 1 set of comb robust setae; dactylus short, with 5 apical cusps. Pereopod 6 basis subquadrate, anterior margin with short plumose and simple setae; carpus slightly longer than propodus and produced posterodistally bearing 4 long setae, posterior margin with 2 sets of comb robust setae, anterior margin with 4 robust setae; dactylus short, with 4 apical cusps. Pereopod 7, basis lobe obliquely rounded and surpassing carpus, with plumose setae on posterodistal margin; isquium length subequal to merus; merus posterodistal lobe extending 1 / 3 of propodus, lobe margin with long plumose setae; carpus anterior margin with two robust setae; propodus longer than carpus, not stout, 2.2X longer than wide; dactylus shorter than propodus and longer than carpus, curved anterodistally. Epimeron 3 posteroventral corner rounded. Urosomite 1 dorsal margin produced into a sharpened upturned carina. Uropod 1 extending beyond uropod 2 peduncle, peduncle shorter than rami, inner margin with 3 robust setae; inner ramus slightly longer than outer ramus with 3 robust setae on inner margin, outer ramus nacked. Uropod 2 peduncle length subequal to inner ramus and with 1 robust seta apical on inner margin; inner margins of both rami with robust setae; outer ramus shorter than inner ramus with a long apical robust seta. Uropod 3 rami lanceolate longer than peduncle, inner ramus wider and longer than outer ramus with setae along inner and distal margin; outer ramus with setae along outer margin. Telson deeply cleft, apices lobes blunt with 2 pair of setae. Male, 5.0 mm. Differing from the female by antennal peduncles with brush setae; deeper notch of urosomite 1 anterodorsal margin and rami of uropod 3 longer, with setules among all margins, except outer margin of outer ramus.
Discussion
Remarks:Ampelisca moreirai sp. nov. belongs to the group of species bearing antenna 1 shorter than antenna 2 peduncle and pereopod 7 merus lobed posteriorly, characters shared with A. brevicornis (Costa, 1853); A. cavicoxa Reid, 1951; A. gibba Sars, 1882; A. pectenata Reid, 1951; A. pugetica Stimpson, 1864; A. senegalensis Chevreux, 1925; A. uncinata Mills, 1971 and A. vervecei BellanSantini & KaïmMalka, 1977. Within this group, Ampelisca moreirai sp. nov. is closer to A. pugetica and A. gibba in having head with anteroventral margin oblique and uropod 3 rami lanceolate. However, the new species can be distinguished from those two species by pereopod 7 merus lobe surpassing carpus and urosomite 1 dorsal margin tapering into a pointed carina upturned. Ampelisca moreirai is also quite similar to A. senegalensis and A. cavicoxa in pereopod 7 merus lobe extending 1 / 3 of propodus, but may be distinguished by head margin anteroventral oblique, pereopod 7 basis obliquely rounded and uropod 2 with a long distal robust seta. Ampelisca moreirai sp. nov. differs from A. brevicornis, A. pectenata, A. uncinata and A. vervecei by pereopod 7 propodus rectangular, urosomite 1 dorsal margin upturned and lanceolate uropod 3 rami. In addition, Ampelisca moreirai sp. nov. can be distinguished from all those above species by epimera 3 posteroventral corner rounded and without spine, while all other species present a small or large spine.
Taxon Treatment
- Valério-Berardo, Maria Teresa; -, Yoko Wakabara; 2006: Ampeliscidae from the Brazilian coast. Record of Ampelisca burkey Barnard & Thomas, 1989 and descriptions of two new species of Ampelisca (Crustacea, Amphipoda), Zootaxa 1286: 8-13. doi
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