193 research outputs found
A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan
No full textObuchi, Masami, Omori, Akihito (2015): A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan. Zootaxa 3972 (3): 441-449, DOI: 10.11646/zootaxa.3972.3.
Fig. 1 in Shallow-water Comatulids (Echinodermata: Crinoidea: Comatulida) of the Ashizuri-Uwakai Sea, Shikoku Island, Southern Japan
No full textFig. 1. The Ashizuri-Uwakai Sea, Shikoku Island, southern Japan. Black circles indicate the sampling sites.Published as part of Obuchi, Masami, 2020, Shallow-water Comatulids (Echinodermata: Crinoidea: Comatulida) of the Ashizuri-Uwakai Sea, Shikoku Island, Southern Japan, pp. 309-328 in Species Diversity 25 on page 310, DOI: 10.12782/specdiv.25.309, http://zenodo.org/record/573881
FIGURE 3. Belonometra kogoi n. gen, n in A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan
No full textFIGURE 3. Belonometra kogoi n. gen, n. sp., OMNH-Iv5435. A, centrodorsal, aboral view; B, centrodorsal, oral view. Scale bars 1 mm.Published as part of Obuchi, Masami & Omori, Akihito, 2015, A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan, pp. 441-449 in Zootaxa 3972 (3) on page 446, DOI: 10.11646/zootaxa.3972.3.9, http://zenodo.org/record/23324
FIGURE 4. Belonometra kogoi n. gen, n in A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan
No full textFIGURE 4. Belonometra kogoi n. gen, n. sp. OMNH-Iv5437. A, basal rosette, lateral view; B, radial cavity, aboral view. Abbreviations: BR, basal ray; R, radial. Scale bars 0.5 mm.Published as part of Obuchi, Masami & Omori, Akihito, 2015, A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan, pp. 441-449 in Zootaxa 3972 (3) on page 446, DOI: 10.11646/zootaxa.3972.3.9, http://zenodo.org/record/23324
Fig. 2. Comanthus scintillus n in Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan
No full textFig. 2. Comanthus scintillus n. sp. A, feeding posture, RUMF-ZE-00437; B, whole animal, aboral view, BIK-EC-CR0095; C, centrodorsal and proximal rays, aboral view, OMNH-Iv6233; D, disk, oral view, RUMF-ZE-00437.Published as part of Obuchi, Masami & Fujita, Yoshihisa, 2017, Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan, pp. 201-206 in Species Diversity 22 on page 203, DOI: 10.12782/sd.22_201, http://zenodo.org/record/573789
Fig. 3 in Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan
No full textFig. 3. Middle segments of distal pinnules, lateral view. A and B, Comanthus scintillus n. sp., holotype, OMNH-Iv6230 (distal fringe of spines distinct in A, but not in B); C, Comanthus gisleni Rowe, Hoggett, Birtles, and Vail, 1986, BIK-EC-CR0107; D, Comanthus suavia Rowe, Hoggett, Birtles, and Vail, 1986, BIK-EC-CR0096. Scale bars 0.5 mm.Published as part of Obuchi, Masami & Fujita, Yoshihisa, 2017, Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan, pp. 201-206 in Species Diversity 22 on page 204, DOI: 10.12782/sd.22_201, http://zenodo.org/record/573789
Fig. 3 in Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan
No full textFig. 3. Middle segments of distal pinnules, lateral view. A and B, Comanthus scintillus n. sp., holotype, OMNH-Iv6230 (distal fringe of spines distinct in A, but not in B); C, Comanthus gisleni Rowe, Hoggett, Birtles, and Vail, 1986, BIK-EC-CR0107; D, Comanthus suavia Rowe, Hoggett, Birtles, and Vail, 1986, BIK-EC-CR0096. Scale bars 0.5 mm.Published as part of Obuchi, Masami & Fujita, Yoshihisa, 2017, Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan, pp. 201-206 in Species Diversity 22 on page 204, DOI: 10.12782/sd.22_201, http://zenodo.org/record/573789
Fig. 1. Comanthus scintillus n in Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan
No full textFig. 1. Comanthus scintillus n. sp., holotype, OMNH-Iv6230. A, centrodorsal and proximal ray, aboral view; B, cirrus, lateral view; C, proximal pinnules (P1 to P3, left to right), lateral view; D, terminal comb on P1, lateral view. Scale bars 5 mm for A and C, 1 mm for B and D.Published as part of Obuchi, Masami & Fujita, Yoshihisa, 2017, Comanthus scintillus, a New Species of Featherstar (Echinodermata: Crinoidea: Comatulida: Comatulidae) from Southern Japan, pp. 201-206 in Species Diversity 22 on page 202, DOI: 10.12782/sd.22_201, http://zenodo.org/record/573789
Belonometra kogoi Obuchi & Omori, 2015, n. sp.
No full textBelonometra kogoi n. sp. [New Japanese Name: Matsuba-Umishida] (Figs. 1–5) Types. Holotype : OMNH-Iv 5432, R 185 mm, west coast of Otsuki, Shikoku Island, Japan, 40.6 m depth, 7 March 2013, SCUBA, coll. M. Obuchi. Paratypes: OMNH-Iv 5433, R 200 mm, same data as OMNH-Iv 5432 (except depth, 30.4 m). OMNH-Iv 5434, R 190 mm, same data as Cr 130307 (except depth, 30.4 m). OMNH-Iv 5435, centrodorsal and radials, R estimated 180 mm, same data as OMNH-Iv 5432 (except depth, 27.0 m). OMNH-Iv 5436, R 115 mm, Horse Shoe Cliff, Onna, Okinawa Island, Ryukyu Islands, Japan, 18.0 m depth, 16 April 2013, SCUBA, coll. M. Obuchi. OMNH- Iv 5437 (dissected), R estimated 80 mm, Horse Shoe Cliff, Onna, Okinawa Island, Ryukyu Islands, Japan, 20.4 m depth, 16 April 2013, SCUBA, coll. M. Obuchi. Description of holotype. Centrodorsal low hemispherical, 7.8 mm across (Fig. 1 B); polar area narrow, slightly concave, 18 % of centrodorsal diameter, smooth without papillae; cirrus sockets closely crowded rather than forming regular rows (Fig. 3 A). Cirri numerous, XCVI (including XXV functional scars), slender, laterally compressed, easy to detach (Fig. 1 B). Peripheral cirri much longer than apical ones, 27–30 mm long, composed of 21–22 segments (Fig. 2 A); cirrals elongated except short proximal two, smooth without aboral keel or process except opposing spine; distal segments with flared distal end, especially on aboral side, overlapping base of next cirrals; c 1 L/ W 0.5; c 2 L/ W 1.0; c 3 L/ W 1.4 –1.7; c 4 L/ W 2.0 – 2.3; c 5–10 longest, L/ W 2.4 –3.0; following cirrals gradually decreasing in length, laterally compressed; antepenultimate L/ W 1.0; penultimate elongated again, L/ W 1.6 –1.8, with straight opposing spine on distal part; terminal claw curved, approximately as long as antepenultimate. Apical cirri approximately 15 mm long, composed of 16 segments; c 5–7 longest, L/W up to 2.7 (Fig. 2 B). FIGURE 2. Belonometra kogoi n. gen, n. sp. (A–K, OMNH-Iv 5432, holotype; K, OMNH-Iv 5436). A, peripheral cirrus; B, apical cirrus; C, proximal brachials; D, P 1; E, P 2; F, P 3; G, P 4; H, P 5; I, P m; J, P d; K, P 1 of small specimen. Scale bars 5 mm. Radials, also Ibr 1, completely concealed by centrodorsal (Fig. 2 C). Ibr 2 (axillary) proximally concealed by centrodorsal, connected to Ibr 1 by synarthry, 3.3 mm wide. Each ray well separated. Ten arms almost equal in length, 175 mm long, 3.0 mm wide at first syzygy. Brachials without aboral projection and modified distal end (Fig. 2 C); proximal four brachials oblong; br 1 united interiorly, W/L 3.0; br 2 completely separated from neighbor, with interior margin proximally notched, W/L 2.3; weak synarthrial tubercle present between br 1 and br 2; br 3 + 4 oblong, W/L 2.7: following brachials until middle arms (about br 60) wedgeshaped, gradually decreasing in length, each with aboral swellings on proximal edge of pinnule-bearing side and distal edge of side opposite pinnule, making proximal arms appear aborally rough; brachials on distal half of arms short, almost oblong, W/L 3.0–4.0, wider than long even at arm tips, with smooth surface (Fig. 1 C). First syzygy at br 3 + 4; second at br 9 + 10 (seven of ten) or br 10 + 11 (three); following at intervals of three (occasionally four) muscular articulations. Pinnules flagellate, greatly elongated except for short P 1 and P 2, lacking aboral carination, comb, side- and covering-plates, and terminal hook; comparative lengths P 1 =P 2 P 5 P 5 P 4>P 5 <P M≤P D; P 3 always longest of proximal pinnules; P 1 5.0–6.0 mm long, 24–26 segments; P 2 6.5 –7.0 mm long, 18–21 segments; P 3 14.3 –16.0 mm long, 28–31 segments; P 4 8.5–9.5 mm long, 23 segments; P 5 11.5 –12.0 mm long, 25–29 segments; P M up to 18.0 mm long, 33 segments; P D up to 20 mm long, 36 segments. Disk 17 mm in diameter. Skeletal morphology. OMNH-Iv 5435. Adoral surface of centrodorsal concave, rugged, with five interradial ridges and several radiating furrows (Fig. 3 B); interradial ridge with median groove, low and indistinct adjacent to opening of centrodorsal cavity, gradually becoming higher, highest and thickest at outer margin. Diameter of adoral opening of centrodorsal cavity 17 % of centrodorsal diameter; opening narrowed by overhanging rim at adoral edge; thus internal diameter of cavity probably larger than opening. Basal rosette located above proximal surface of radial pentagon, perforated centrally, with five radial and five narrower, not spout-like interradial processes (Fig. 4 A); basal rays rod-shaped, broad, each with distinct median groove, strongly curved upward and exposed as globular tubercles at each corner of radial pentagon (Fig. 4 B, 5 B); interior end of basal rays adjacent to thin circlet enclosing and slightly overhanging radial cavity. Radial cavity with sparse calcareous filling. Radial pentagon much smaller than centrodorsal in diameter, but each corner reaching almost to margin of centrodorsal (Fig. 5 A). Radial facets high trapezoidal with broadened bottom, H/ W 1.3, concaved (Fig. 5 B); muscular fossae almost parallel to oral-aboral axis, interarticular ligament fossae steep, and aboral ligament fossa more gently sloping; pairs of muscular and interarticular ligament fossae laterally separated from adjacent ones. Muscular fossae, thin, flange-like, slightly higher than interarticular ligament fossae, H/ W 1.5, deeply concave near intermuscular septum; intermusclar notch distinct; intermuscular septum broad, running from just above central nerve canal to near intermuscular notch, with deep median furrow. Interarticular ligament fossae proximally broadened, H/ W 1.3, shallowly concave, separated from muscle fossae by narrow diagonal ridge; lateral edge shallowly notched. Aboral ligament fossa low semicircular, much lower than interarticular ligament fossae, H/ W 0.3. Central nerve canal rounded square; ligament pit slightly larger than central nerve canal. Radial clefts distinct (Fig. 5 A). Cr 130416 d: small but mature specimen. Opening of centrodorsal cavity larger, 25 % of centrodorsal diameter; adoral edge of cavity thickened, forming distinct lip. Radial cavity without calcareous filling, completely empty. Radial facet with lateral margins not notched at interarticular ligament fossae. Coloration in life. Ground body color chrome yellow to dark brown (Fig. 1 A). Cirri khaki. Arms with two dark longitudinal lines gradually fading in distal arm, unclear in life but recognizable in preserved specimens (Fig. 1 B, C). Pinnules faded distally, yellow to whitish at tip; each pinnular with dark pigmentation on side toward arm tip; fleshy part of genital pinnules containing bright orange gonad (Fig. 1 D). Distal end of brachials and pinnulars sometimes whitish. Habitat and ecology. The specimens were found usually deeper and rarely shallower than 25 m in rocky areas in Kochi, and in small crevices on drop-offs of coral reefs at Okinawa Island. Living animals were usually located behind overhanging rocks, but sometimes exposed on pinnacles where current flows, exhibiting multidirectional posture in which pinnules were aligned in six rows along each arm (Fig. 1 A, C). When disturbed, the animals vigorously swam away from the substratum. Etymology. Named for Ichizo Kogo in recognition of his contributions to understanding the Japanese crinoid fauna. Remarks. Some characters are different between large and small specimens, suggesting difference with regards to individual growth. As mentioned above, in the small specimen, the size of centrodorsal cavity is smaller, and the overhanging lip on the adoral edge of the centrodorsal cavity is distinct. Distal arm brachials are short but not remarkably so in small specimens. Aboral processes on proximal segments of proximal to middle pinnules are more distinct in small specimens, although this feature varies between the same-sized specimens, e.g., OMNH- Iv 5432 and OMNH-Iv 5434.Published as part of Obuchi, Masami & Omori, Akihito, 2015, A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan, pp. 441-449 in Zootaxa 3972 (3) on pages 444-448, DOI: 10.11646/zootaxa.3972.3.9, http://zenodo.org/record/23324
FIGURE 1. Dorometra sesokonis n in A new brooding feather star of the genus Dorometra (Echinodermata: Crinoidea: Comatulida: Antedonidae) from the Ryukyu Islands, southwestern Japan
No full textFIGURE 1. Dorometra sesokonis n. sp., OMNH Iv 3444-1: A, aboral view of centrodorsal and proximal arms; B, oral view of disk and proximal arms; C, distal arm with pinnules (aboral view); D, large and small cirri (side view). Parenthesized pinnules are absent. Abbreviations represent at: anal tube, cd: centrodorsal, ci: cirrus, eg: attached egg, mo: mouth, re: ripe egg in gonad, sy: syzygy. Scale bar 1.0 mm.Published as part of Obuchi, Masami, Kogo, Ichizo & Fujita, Yoshihisa, 2009, A new brooding feather star of the genus Dorometra (Echinodermata: Crinoidea: Comatulida: Antedonidae) from the Ryukyu Islands, southwestern Japan, pp. 61-68 in Zootaxa 2008 on page 64, DOI: 10.5281/zenodo.18573
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