5,443 research outputs found
New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin
No full textMeland, Kenneth, Brattegard, Torleiv (2007): New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin. Zootaxa 1628: 43-58, DOI: 10.5281/zenodo.17932
Xibalbanidae Olesen, Meland, Glenner, van Hengstum & Iliffe 2017
No full textFamily Xibalbanidae fam. nov. urn:lsid:zoobank.org:act: 920F5F9D-BC04-4D64-8EA2-E3495D03C493 Type genus Xibalbanus Hoenemann, Neiber, Schram & Koenemann, 2013. Diagnosis Same as for Xibalbanus, see Hoenemann et al. (2013). Included species Xibalbanus tulumensis (Yager, 1987 b) Xibalbanus fuchscockburni (Neiber et al., 2012) Xibalbanus cokei (Yager, 2013) comb. nov.Published as part of Olesen, Jørgen, Meland, Kenneth, Glenner, Henrik, Van Hengstum, Peter J. & Iliffe, Thomas M., 2017, Xibalbanus cozumelensis, a new species of Remipedia (Crustacea) from Cozumel, Mexico, and a molecular phylogeny of Xibalbanus on the Yucatán Peninsula, pp. 1-27 in European Journal of Taxonomy 316 on pages 6-9, DOI: 10.5852/ejt.2017.316, http://zenodo.org/record/382739
A taxonomical review of the Gnathophausia (Crustacea, Lophogastrida), with new records from the northern mid-Atlantic ridge
No full textMeland, Kenneth, Aas, Pål Øyvind (2013): A taxonomical review of the Gnathophausia (Crustacea, Lophogastrida), with new records from the northern mid-Atlantic ridge. Zootaxa 3664 (2): 199-225, DOI: 10.11646/zootaxa.3664.2.
FIGURE 4. Pseudomma maasakii n in New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin
No full textFIGURE 4. Pseudomma maasakii n. sp. Paratype female (18 mm). A, mandible palp. B, maxillule. C, maxilla. D, endopod of uropod. E, telson.Published as part of Meland, Kenneth & Brattegard, Torleiv, 2007, New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin, pp. 43-58 in Zootaxa 1628 on page 50, DOI: 10.5281/zenodo.17932
FIGURE 2 in New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin
No full textFIGURE 2. Amblyops spinifera Nouvel and Lagardère, 1976. Female (12 mm). A. anterior portion of cephalon and cephalic appendages. B. proximal end of endopod of uropod. C, telson.Published as part of Meland, Kenneth & Brattegard, Torleiv, 2007, New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin, pp. 43-58 in Zootaxa 1628 on page 47, DOI: 10.5281/zenodo.17932
Pseudomma maasakii Meland & Brattegard, 2007, n. sp.
No full textPseudomma maasakii n. sp. <p> <i>Pseudomma</i> sp. Murano and Mauchline 1999: 279 –280.</p> <p> <i>Pseudomma</i> sp. M&M Meland 2004:3; Meland and Willassen 2004: 18 S rRNA (AY624301), COI mtDNA (AY624281).</p> <p> <i>Material examined</i></p> <p> <i> <i>Type material.</i> Holotype</i> (adult male, 16 mm), IMNH-2183, stn BIOICE 2860. <i>Allotype</i> (adult female, 19 mm), ZMBM-68270, stn BIOICE 3167. <i>Paratypes</i>, Stn BIOICE 2856, 2 females (18 mm), IMNH-2184. Stn BIOICE 2859, 1 adult male (15 mm), 1 immature female (16 mm), IMNH-2185. Stn BIOICE 2860, 1 adult female (thorax), 1 juvenile (8 mm) IMNH-2186. Stn BIOICE 2864, 1 male (14 mm), IMNH-2187. Stn BIO- ICE 3162, adult female (19 mm), IMNH-2188. Stn BIOICE 3164, adult female (18 mm), 2 juveniles, IMNH- 2189. Stn BIOICE 3167, 1 adult female (19 mm), IMNH-2190.</p> <p> <i>Description</i></p> <p> <i>Carapace</i> (Fig. 3 A) with anterior margin evenly rounded and anteriorly produced lateral corners.</p> <p> <i>Ocular plate</i> (Fig. 3 A, B) extending to mid-portion of first segment of antennular peduncle; plate deeply cleft, medial section slightly produced in males, anterior portion of dorsal surface finely serrated with minute spinules; antero-lateral margins armed with eight minute setae.</p> <p> <i>Antennal scale</i> (Fig. 3 C) three times longer than broad; distal terminal denticle on outer margin consisting of two to three spines; apex extending beyond terminal denticle, without suture, outer margin of apex armed with five setae.</p> <p> <i>Left mandible</i> setal row consisting of three hirsute spines and <i>right mandible</i> setal row consisting of eight entire spines. Distal segment of <i>mandible palp</i> (Fig. 4 A) with five enlarged proximal ventral setae, medial margin with row of eight to 11 setae, dorsal margin with five to six setae.</p> <p> <i>Maxillule</i> (Fig. 4 B), apex of coxal lobe armed with three strong setae bordered by three smaller setae placed distal-posterior, distal-ventral, and distal-anterior; anterior lateral margin armed with four setae in medial region; ventral surface and posterior lateral margin supporting eight to ten setae; ventral surface of maxillule basis supporting three setae, posterior lateral margin armed with robust setae, apex supporting 14 strong cuspidate setae.</p> <p> <i>Maxilla</i> (Fig. 4 C) with three setae on proximal inner margin of endopod; exopod supporting 24-28 lateral setae; coxa with one or two setae on dorsal surface, coxal surface without spines or denticles, lateral margin of coxa armed with two rows of setae, dorsal row consisting of one large and four or five smaller setae.</p> <p> First and second thoracic appendages formed as <i>maxillipeds</i>; first maxilliped with large nail bearing five denticles, dactylus fringed with four to five large setulate setae on each lateral margin; second maxilliped with small nail, dactylus fringed with nine to ten large setulate setae on each lateral margin. <i>Third to eighth thoracic appendages</i> take on the form of long and slender pereopods. <i>Female marsupium</i> consists of three pairs of oostegites arising from the sixth to eighth pereopods, increasing in size posteriorly. <i>Male genital organ</i> extending beyond seventh pereopod, bearing two apical setae.</p> <p> Sixth abdominal somite two times longer than fifth. <i>Pleopods of male</i> biramous; first pleopod with unsegmented endopod and 12–segmented exopod; second to fourth pleopods with 10-segmented endo- and exopods; fifth pleopod with 9-segmented endo- and exopods; distal setae on third and fourth pleopods not modified. <i>Female pleopods</i> uniramous, taking on the form of unsegmented plates and set with apical and ventral surface setae.</p> <p> <i>Uropod</i> endopod (Fig. 4 D) with one ventrally placed strong spinose seta on inner margin near statocyst, outer margin of endopod armed with 13 large setae, and 16 small setae.</p> <p> <i>Telson</i> (Fig. 4 E), lateral margins entire, apex armed with two pairs of spinose setae; apex with one pair of median plumose setae.</p> <p> <i>Etymology</i></p> <p>The species was first recognized by Murano and Mauchline (1999) and is named in honour of Dr. Maasaki Murano for his huge contribution to mysid taxonomy.</p> <p> <i>Distribution</i></p> <p> Three specimens of <i>Pseudomma maasakii</i> have earlier been recorded from the Rockall Trough as stomach content in the deep-water grenadier species <i>Nematonurus armatus</i> (Hector, 1875) and <i>Coryphaenoides guentheri</i> (Vailant, 1888) (Murano and Mauchline 1999). The present BIOICE material extends its species range into 2300 m depths of the Iceland Basin.</p> <p> <i>Remarks</i></p> <p> Due to the shared telson characters with two pairs of apex setose setae and the absence of lateral spinose setae, <i>P. maasakii</i> resembles <i>P. m a t s u i</i> Murano, 1966. However, it is easily distinguishable from all <i>Pseudomma</i> species based on the antennal terminal denticle consisting of two to three spines (Fig. 3 C), and also the anterior lateral margin of the maxillule coxal lobe that is armed with four setae in the medial region (Fig. 4 B).</p>Published as part of <i>Meland, Kenneth & Brattegard, Torleiv, 2007, New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin, pp. 43-58 in Zootaxa 1628</i> on pages 48-51, DOI: <a href="http://zenodo.org/record/179324">10.5281/zenodo.179324</a>
FIGURE 7. Pseudomma antarcticum Zimmer, 1914. A, E in New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin
No full textFIGURE 7. Pseudomma antarcticum Zimmer, 1914. A, E, North Atlantic immature female (13 mm); B, C, North Atlantic female (14 mm); D, Antarctic male (20 mm). A, anterior portion of cephalon and cephalic appendages. B, antennal scale. C, mandible palp. D, maxillule. E, maxilla.Published as part of Meland, Kenneth & Brattegard, Torleiv, 2007, New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin, pp. 43-58 in Zootaxa 1628 on page 55, DOI: 10.5281/zenodo.17932
FIGURE 6. Pseudomma islandicum n in New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin
No full textFIGURE 6. Pseudomma islandicum n. sp. A-B, holotype male (11 mm); C–D, paratype female (11 mm). A, male third pleopod. B, male fourth pleopod. C, uropod. D, telson. Numbers indicate modified pleopod setae.Published as part of Meland, Kenneth & Brattegard, Torleiv, 2007, New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin, pp. 43-58 in Zootaxa 1628 on page 53, DOI: 10.5281/zenodo.17932
Pseudomma islandicum Meland & Brattegard, 2007, n.sp.
No full textPseudomma islandicum n.sp. Material examined Type material. Holotype (adult male, 11 mm), IMNH- 2191, stn BIOICE 2860. Allotype (adult female, 11 mm), IMNH- 2192, stn BIOICE 2860. Paratypes. Stn BIOICE 2856, 1 adult female (11 mm), IMNH- 2193. Stn BIOICE 2859, 1 immature male (9 mm), 1 immature male (thorax), 2 adult females (11 mm), 1 immature female (10 mm), 1 juvenile (7 mm), IMNH- 2194. Stn BIOICE 2860, 1 immature male, (8), 1 immature male (11 mm), 1 adult female (11 mm), 2 immature females (8 mm), 1 adult female (thorax), 1 immature female (thorax), 3 juveniles, IMNH- 2195. Stn BIOICE 2863, 1 immature male (9 mm), 1 adult female (11 mm). Description Carapace (Fig. 5 A) with anterior margin evenly rounded and anteriorly produced lateral corners. Ocular plate (Fig. 5 A) extending to mid-portion of first segment of antennular peduncle; plate deeply cleft, anterior median portion of plate slightly produced in males; antero-lateral margins coarsely serrated with 20-25 stout setae. Antennal scale (Fig. 5 B) 3.5 times longer than broad; distal terminal denticle on outer margin consisting of one spine; apex extends beyond terminal denticle, without suture, outer margin of apex armed with five setae. Left mandible setal row consisting of three hirsute spines and right mandible setal row consisting of nine or ten entire spines. Distal segment of mandible palp (Fig. 5 C) with three enlarged proximal ventral setae in male and five in female, medial margin with row of nine to 11 setae, dorsal margin with eight setae. Maxillule (Fig. 5 D), apex of coxal lobe armed with three strong setae bordered by three smaller setae placed distal-posterior, distal-ventral, and distal-anterior; anterior lateral margin armed with two setae in medial region; ventral surface and posterior lateral margin supporting seven to nine setae; ventral surface of maxillule basis supporting three setae, posterior lateral margin set with small setae, apex supporting 14 strong cuspidate setae. Maxilla (Fig. 5 E) with three setae on proximal inner margin of endopod; exopod supporting 19–20 lateral setae; coxa with seven or eight setae on dorsal surface, coxal surface set with small denticles, lateral margin of coxa armed with two rows of setae, dorsal row consisting of one large and five smaller setae. First and second thoracic appendages formed as maxillipeds; first maxilliped dactylus fringed with five large setulate setae on each lateral margin; second maxilliped with long nail, dactylus fringed with seven to nine large setulate setae on each lateral margin. Third to eighth thoracic appendages take on the form of long and slender pereopods. Female marsupium consists of three pairs of oostegites arising from the sixth to eighth pereopods, increasing in size posteriorly. Male genital organ extending beyond seventh pereopod, bearing one apical seta. Sixth abdominal somite two times longer than fifth. Pleopods of male biramous; first pleopod with unsegmented endopod and 8 –segmented exopod; second pleopod 8 -segmented endopod and exopod; third to fifth exopods 7 -segmented; third, fourth, and fifth endopods 6 -, 7 -, and 5 -segmented, respectively. The third pleopods three penultimate segments of endopod and exopod support enlarged setae (Fig 6 A); fourth pleopods bear enlarged setae on the three penultimate segments of endopods and four enlarged setae on the four penultimate segments of exopods (Fig. 6 B). Female pleopods uniramous, taking on the form of unsegmented plates and set with apical and ventral surface setae. Uropod endopod (Fig. 6 C) with one ventrally placed strong spinose seta on inner margin near statocyst, outer margin of endopod armed with 13 large setae, and 13 small setae. Telson (Fig. 6 D), distal end of lateral margins armed with six to 11 spinose setae, apex armed with six pairs of spinose setae; apex with one pair of median plumose setae. Etymology The species is named for its present distribution. Distribution Pseudomma islandicum is found at more than 2500 m depths in the eastern Iceland Basin. Remarks Pseudomma islandicum bears close resemblance to P. j a s i Meland & Brattegard, 1995, and a close relationship between these two species is suggested. The erection of a new species is justified based on the telson in P. islandicum being armed with spinose setae on the distal third portion of the lateral margins, whereas in P. jasi the lateral setae do not extend much further than the apex. Also, when compared to P. j a s i, the serrated antero-lateral margins of the ocular plates are quite conspicuous in P. islandicum, opposed to the minute serration seen in P. j a s i. It is interesting to note characters of the mandible palp, where as in P. maasakii n. sp. there are up to five enlarged proximal setae on the distal segment of the palp, which is a character state most often found in Pseudomma species from the Antarctic such as P. a r m a t u m Hansen, 1913, P. belgicae Holt & Tattersall, 1906, and P. antarcticum Zimmer, 1914. Regarding Pseudomma species from the Antarctic a clarification with reference to figured Pseudomma species in Petryashov (2006) is necessary. Note that Petryashov depicts the antennal scales of P. a r m a t u m, P. calmani, and P. belgicae with what resembles apical sutures. As such a suture has never been observed in Pseudomma, it is important to note that the supposed scale sutures, in the three Antarctic species housed in the Russian Academy collections, are actually artifacts of folding during slide preperations (Petryashov, pers. comm).Published as part of Meland, Kenneth & Brattegard, Torleiv, 2007, New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin, pp. 43-58 in Zootaxa 1628 on pages 51-54, DOI: 10.5281/zenodo.17932
Lophogastrida Boas 1883
No full textOrder Lophogastrida Boas, 1883Published as part of Meland, Kenneth & Aas, Pål Øyvind, 2013, A taxonomical review of the Gnathophausia (Crustacea, Lophogastrida), with new records from the northern mid-Atlantic ridge, pp. 199-225 in Zootaxa 3664 (2) on page 200, DOI: 10.11646/zootaxa.3664.2.5, http://zenodo.org/record/22033
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