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FIGURE 13 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 13. Number of cirrus sockets versus centrodorsal height in Atopocrinus sibogae (filled triangle) and A. ojii n. sp. (filled circles).

FIGURE 2 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 2. Atopocrinus sibogae, holotype (NBC V.ECH.C. 2097). A–B. Two views of centrodorsal and bases of rays. C–D. Corresponding enlarged views of proximal portion of centrodorsal, ends of basals and (at top) portions of radial ossicles. E. Br7 syzygy; distal articular facet. * indicates end of one basal (=basal ray of A.H. Clark). Arrowheads indicate apparent sutures of A.H. Clark's (1915, p. 329) "reduced and laminar basals". Arrowheads correspond to arrows in Figure 1A. Photo credit 2E: J. Bleeker, NBC. Scale bars: 1 mm.

FIGURE 7 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 7. Atopocrinus ojii new species, paratype (SAM K2158). Two lateral views of specimen to show slight bend in centrodorsal. Scale bars: 5 mm.

FIGURE 1. Atopocrinus sibogae, holotype. A. From A.H in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 1. Atopocrinus sibogae, holotype. A. From A.H. Clark (1915, fig. 227, pp. 245). Arrows mark supposed sutures of reduced basal between basal ray above and centrodorsal per A.H. Clark (1912, 1915). B. From A.H. Clark (1918, fig. 15, p. 263). Arrow marks suture between his basal ray and centrodorsal. * indicates end of one basal ray (according to A.H. Clark), which is treated as the true basal herein.

FIGURE 10 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 10. Atopocrinus ojii new species, paratype (USNM cat. no. 1548291), SEM images, brachial ossicles. A. Br2 proximal facet; synarthry. B. Br4 distal facet; syzygy. C. Br5 distal facet with projecting pinnule articulation at left; muscular synarthry. D. Br6 distal facet with pinnule articulation at upper right, muscular synarthry. E. Lateral view of D; proximal articulation to lower left. F. Enlargement of lateral surface of E. G. Middle brachial with pinnule articulation at upper left, distal facet; muscular synarthry. H. Middle brachial with pinnule articulation at right; ambulacral view. I. Middle brachial, proximal facet; syzygy. Scale bars: A, B, D–I—1 mm; C—500 µm.

FIGURE 4 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 4. Atopocrinus ojii new species, holotype (OMNH Iv2233). A. Entire specimen. B. Enlarged view of proximal portion of centrodorsal and basals in A. Large upper arrowheads indicate suture between basals and centrodorsal (with exterior end of left-hand basal larger than right-hand basal); smaller arrowheads indicate faint suture-like lines. C. Enlargement of proximal portion of centrodorsal and basals in a different radial area than B; upper arrowheads indicate centrodorsal/basal suture; lower arrowheads indicate apparent second suture in interradial ridge. D. Aboral view of radial with centrodorsal base and external ends of two basals. Upward-pointing arrowheads indicate centrodorsal/basal suture; downward-pointing arrowheads indicate basal/radial suture; left-pointing arrowheads indicate possible fractures within basal ossicles. Scale bars: A—5 mm; B, C—1 mm.

FIGURE 3 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 3. In situ image attributed to Atopocrinus sibogae. Screengrabs from video taken north of Pulau Sangihe, 28 July 2010, 4°14.894'N, 125°15.879'E, depth 1,151.1–1,151.7 m. A. Entire specimen; current from right rear; arrows indicate filamentous distal arms lacking pinnules. B. Close-up of cirri. C–D. Proximal (C) and middle pinnules (D). Large arrows indicate irregularly or smoothly undulating long primary podia. Small arrows indicate straight lines of secondary podia in extended feeding orientation. Credit: NOAA Okeanos Explorer Program, INDEX-SATAL 2010.

FIGURE 12. Centrodorsals. A. Atopocrinus sibogae holotype, Leiden V.ECH.C 2097. B–F. Atopocrinus ojii new species. B in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 12. Centrodorsals. A. Atopocrinus sibogae holotype, Leiden V.ECH.C 2097. B–F. Atopocrinus ojii new species. B. Paratype (OMNH Iv 2980). C. Holotype (OMNH Iv2233). D. Paratype (OMNH Iv2448). E. Paratype (USNM 1548291). F. Paratype (SAM K2158) Scale bar: 1 mm.

FIGURE 14 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 14. Spinimetra chesnieri Hess & Thuy, 2017. MHNLM 2015.1.26, holotype, centrodorsal with attached basal circlet. A. lateral view. B. aboral view. Scale bars: 500 μm. Modified from Hess & Thuy (2017, fig. 8b2, b3); used with permission.

FIGURE 6. Atopocrinus ojii new species. A, C in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 6. Atopocrinus ojii new species. A, C. Large paratype (OMNH Iv2448). A. Entire specimen. C. Enlargement of an interradial ridge (not the same as in A). B, D. Small paratype (OMNH Iv 2980). B. Lateral view of entire specimen. D. Enlargement of an interradial ridge (not the same as in B). Uppermost large arrowheads in C and D indicate suture between basal (*) and centrodorsal; lower large arrowheads indicate suture-like line that may be equivalent to supposed suture between A.H. Clark's (1915) "reduced basal" and centrodorsal in A. sibogae; small arrowheads indicate additional suture-like lines. Scale bars: A—5 mm; B—1 mm.

FIGURE 9 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 9. Atopocrinus ojii new species, paratype (USNM cat. no. 1548291), SEM images. A–B. Basal ossicles; interior to left. A. Aboral view. B. Adoral view. C–G. Radial ossicles (adoral margins of muscle fossae in C–F chiefly broken or eroded). C–E. Distal articular facets; D. Slightly oblique view; E. Slightly oblique adoral view. F. Interior surface. G. Aboral surface. Scale bars: A, B—500 μm; C, G—1 mm.

FIGURE 5 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 5. Atopocrinus ojii new species, holotype (OMNH Iv2233). Pinnules. A. P1 (first pinnule on right side of br2), oblique aboral view. B. Pc (third pinnule on right side of br9 of different arm bearing P1 on left side of br2), side view. Dotted lines indicate breakage points. Scale bar: 5 mm.

FIGURE 8 in A revision of the unusual feather star genus Atopocrinus with a description of a new species (Echinodermata: Crinoidea)

FIGURE 8. Atopocrinus ojii new species, paratype (USNM cat. no. 1548291) SEM images, centrodorsal. A. Lateral view (composite of two images separated by horizontal white line). B. Adoral surface showing tube-like rudimentary cirrus sockets and stellate depression around centrodorsal cavity, with interradial rays. C. Portion of interradial buttress within centrodorsal cavity adjacent to adoral cavity opening (out of sight to right) showing ladderlike arrangement of grooves and ridges. D. Lateral view of basal portion of centrodorsal showing interradial ridge (center). Scale bars: A, B, D—1 mm; C—100 µm.