30,494 research outputs found
Septicollarina zezinae Bitner, 2009, sp. nov.
No full textSepticollarina zezinae sp. nov. (Fig. 8; for a full systematic description see below) This is the first record of the genus Septicollarina from the New Caledonian region, including the Norfolk Ridge. The species was found on Jumeau East, Porthos and Zorro seamounts at a depth range of 670– 950 m. It occurs in the Fiji area (Bitner 2008) but, because of very limited material (one specimen), was at the time ascribed only to genus level. Two other species of Septicollarina ― S. hemiechinata Zezina, 1981 a from off Java and S. oceanica Zezina, 1990 from the Eastern Pacific ― are known from shallower water (240–485 m).Published as part of Bitner, Maria Aleksandra, 2009, Recent Brachiopoda from the Norfolk Ridge, New Caledonia, with description of four new species, pp. 1-39 in Zootaxa 2235 on page 14, DOI: 10.5281/zenodo.19039
Aulites crosnieri Bitner, 2009, sp. nov.
No full textAulites crosnieri sp. nov. (Fig. 5; for a full systematic description see below) This rhynchonellide, closely related to Cryptopora, was represented by only three specimens from a single sample on Crypthelia seamount at 200– 291 m. The genus Aulites, originally monospecific, was previously known only from off the east, south and west coasts of Australia (Dall 1920; Richardson 1987). The present finding extends the geographical range of the genus about 1,500 km to the west.Published as part of Bitner, Maria Aleksandra, 2009, Recent Brachiopoda from the Norfolk Ridge, New Caledonia, with description of four new species, pp. 1-39 in Zootaxa 2235 on page 9, DOI: 10.5281/zenodo.19039
Nipponithyris afra Cooper-Bitner & Logan 1973
No full textNipponithyris afra Cooper, 1973 (Fig. 1 H–R) 2016 Nipponithyris afra Cooper—Bitner & Logan, p. 28, fig. 16 (cum syn.). Material examined. DongSha 2014 cruise, stn CP 4130, 20°16’N, 116°08’E, depth 795–822 m, six specimens. Measurements. Maximum length 15.0 mm, width 12.7 mm, thickness 7.1 mm. Description. Shell of medium size, subpentagonal in outline, longer than wide, ventribiconvex with smooth surface and strongly unisulcate anterior commissure. Beak erect with weakly defined beak ridges. Foramen circular, mesothyrid to permesothyrid. Deltidial plates conjunct forming a visible symphytium. Shell posteriorly strongly thickened (Fig. 1 N– R). Ventral valve interior with short, thick teeth with swollen bases; delthyrial cavity narrow. Dorsal valve interior with massive inner socket ridges. Cardinal process prominent. Crura short. Descending branches slender becoming broad anteriorly. Septum short. Remarks. The specimens correspond well with those described as Nipponithyris afra. This species was first recorded by Cooper (1973a) from off Mozambique (see also Bitner & Logan 2016) and later recognized in the New Caledonian region (Laurin 1997). Nipponithyris afra differs from N. nipponensis Yabe & Hatai, 1934 that is found off the coasts of Japan in being rounder and in having a more strongly sulcate anterior commissure (Hatai 1940, Cooper 1973a).Published as part of Bitner, Maria Aleksandra & Romanin, Marco, 2017, Recent brachiopods from the South China Sea, NW Pacific, pp. 287-290 in Zootaxa 4306 (2) on page 289, DOI: 10.11646/zootaxa.4306.2.9, http://zenodo.org/record/84383
Annuloplatidia richeri Bitner, 2009, sp. nov.
No full textAnnuloplatidia richeri sp. nov. (Fig. 10; for a full systematic description see below) This is the first record of the genus Annuloplatidia from the New Caledonian region including the Norfolk Ridge, although the genus is known from the western Pacific (Zezina 1981 b), Atlantic and eastern Pacific (Atkins 1959; Bernard 1972; Lüter 2007). Annuloplatidia richeri was found only in sediment samples collected during Norfolk 1 cruise on 3 seamount cruises (Tables 1, 2). Its bathymetric range is 200–967 m (Fig. 14).Published as part of Bitner, Maria Aleksandra, 2009, Recent Brachiopoda from the Norfolk Ridge, New Caledonia, with description of four new species, pp. 1-39 in Zootaxa 2235 on page 16, DOI: 10.5281/zenodo.19039
Megerella Bitner & Logan 2016, n. gen.
No full textGenus Megerella n. gen. TYPE SPECIES. — Megerella hilleri n. gen., n. sp. by monotypy. ETYMOLOGY. — Referring to the affinity of this genus to the genera Megerlina and Megerlia. DIAGNOSIS. — Small, subquadrate kraussinid with widely spaced ribs and a bifurcate loop with distal extensions uniting to form a complete oval ring, weak dental plates present in adults.Published as part of Bitner, Maria Aleksandra & Logan, Alan, 2016, Recent Brachiopoda from the Mozambique-Madagascar area, western Indian Ocean, pp. 5-41 in Zoosystema 38 (1) on page 32, DOI: 10.5252/z2016n1a1, http://zenodo.org/record/457814
Oceanithyris Bitner & Zezina
No full textGenus Oceanithyris Bitner & Zezina gen. nov. Type species. Oceanithyris juveniformis Bitner & Zezina gen. et sp. nov. Diagnosis. Small terebratulide, biconvex, shell surface with numerous wrinkled growth lines; foramen large, deltidial plates minute, triangular, disjunct, pedicle collar absent; teeth hooked, without dental plates; inner socket ridges high and anteriorly divergent; no cardinal process; lophophore trocholophous, with no brachial skeleton. Etymology. Referring to the oceanic occurrence. Remarks. Very few diagnostic characters can be seen, but the Family Dyscoliidae is the only one among short-looped brachiopods with representatives having a trocholophous lophophore in adults. Additionally, our specimens have very delicate striae in the posterior part; such striae are common in all dyscoliids known today, and this led us to attribute Oceanithyris juveniformis, with some doubts, to the Dyscoliidae.Published as part of Bitner, Maria Aleksandra, Melnik, Vjacheslav P. & Zezina, Olga N., 2013, New paedomorphic brachiopods from the abyssal zone of the north-eastern Pacific Ocean, pp. 281-288 in Zootaxa 3613 (3) on page 283, DOI: 10.11646/zootaxa.3613.3.6, http://zenodo.org/record/21576
Cryptopora norfolkensis Bitner, 2009, sp. nov.
No full textCryptopora norfolkensis sp. nov. (Fig. 4; for a full systematic description see below) The micromorphic brachiopod Cryptopora norfolkensis was found on five seamounts (Tables 1, 2), with a depth range of 200 to 980 m (Fig. 14). The genus Cryptopora has a worldwide distribution (Logan 2007) but this is the first record from the Norfolk Ridge. D’Hondt (1987) reported C. boettgeri Helmcke, 1940 from the New Caledonian slope but he had limited material and did not investigate internal structures, making it difficult to assess the reliability of his species assignment. The material collected during the Norfolk 1 and 2 cruises comprises more than 290 specimens, all found in loose sediment.Published as part of Bitner, Maria Aleksandra, 2009, Recent Brachiopoda from the Norfolk Ridge, New Caledonia, with description of four new species, pp. 1-39 in Zootaxa 2235 on page 8, DOI: 10.5281/zenodo.19039
Annuloplatidia richeri Bitner, 2009, sp. nov.
No full textAnnuloplatidia richeri sp. nov. (Fig. 10; for a full systematic description see below) This is the first record of the genus Annuloplatidia from the New Caledonian region including the Norfolk Ridge, although the genus is known from the western Pacific (Zezina 1981 b), Atlantic and eastern Pacific (Atkins 1959; Bernard 1972; Lüter 2007). Annuloplatidia richeri was found only in sediment samples collected during Norfolk 1 cruise on 3 seamount cruises (Tables 1, 2). Its bathymetric range is 200–967 m (Fig. 14).Published as part of Bitner, Maria Aleksandra, 2009, Recent Brachiopoda from the Norfolk Ridge, New Caledonia, with description of four new species, pp. 1-39 in Zootaxa 2235 on page 16, DOI: 10.5281/zenodo.19039
Eucalathis daphneae Bitner & Logan 2016, n. sp.
No full textEucalathis daphneae n. sp. (Fig. 10 E-O; Table 9) TYPE MATERIAL. — North-West Madagascar. MIRIKY, stn DW 3234, holotype (MNHN IB-2013-61; Fig. 10 F-J). — Same data, stn DW 3196, paratypes (MNHN IB-2013-62, 63; Fig. 10E, K-O). TYPE LOCALITY. — Madagascar, MIRIKY, stn DW 3234, 13°27'S, 47°55'E, 187- 247 m. DIAGNOSIS. — Eucalathis with single, broad, rounded costae nearly smooth in anterior half, and incomplete loop. MATERIAL EXAMINED. — North-West Madagascar. MIRIKY, stn DW 3196, 8 bivalved specimens. — Stn DW 3234, 2 bivalved specimens, 1 ventral valve, 1 dorsal valve. DEPTH RANGE. — 187-249 m DESCRIPTION Shell small (maximum observed length 5.9 mm), ventribiconvex, widely subtriangular in outline. Shell surface covered with 10-12 strong, single, rounded costae. Costae weakly beaded posteriorly, nearly smooth in anterior half except where crossed by elevated growth lines; intercostal spaces wide. Anterior commissure rectimarginate. Hinge line slightly curved. Beak low, suberect. Foramen large, subcircular, mesothyrid; deltidial plates small, triangular (Fig. 10E, G). Ventral valve interior with small teeth; pedicle collar wide. Dorsal valve interior with massive inner socket ridges extending beyond margin. Cardinal process distinct. Crura long, slender; crural processes short, can be slightly incurved. Loop short with an incomplete transverse band (Fig. 10 I-O). Low, short median ridge visible on inner dorsal valve. Inner margin of both valves crenulated. REMARKS In size, outline and ornamentation the new species described here is most similar to Eucalathis rotundata. In the strong costation E. daphneae n. sp. also resembles E. rugosa Cooper, 1973, differing in size and outline, as well as in the character of costae. E. rugosa possesses beaded, strongly tuberculate ribs (Cooper 1973c; Laurin 1997; Bitner 2008, 2009, 2010); in E. daphneae ribs are nearly smooth. However, the species described by Cooper (1973c, 1981a) have a typical loop for the genus, whereas in all specimens collected in North-West Madagascar the loop has an incomplete transverse band. Among Recent representatives of chlidonophorids only in the species Melvicalathis macroctena (Zezina, 1981) may the loop be incomplete (Zezina 1981b; Lee et al. 2008), however, it possesses broad, triangular in cross-section costae with smooth ridges without any tubercles, differing greatly from E. daphneae. In the fossil chlidonophorids an incomplete loop is observed only in the Eocene-Oligocene genus Orthothyris Cooper, 1955 (see Bitner & Müller 2015).Published as part of Bitner, Maria Aleksandra & Logan, Alan, 2016, Recent Brachiopoda from the Mozambique-Madagascar area, western Indian Ocean, pp. 5-41 in Zoosystema 38 (1) on page 18, DOI: 10.5252/z2016n1a1, http://zenodo.org/record/457814
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