Astrodia excavata (Lütken & Mortensen, 1899 )

Granja-Fernández, Rebeca, Hendrickx, Michel E., Rangel-Solís, Pedro Diego & López-Pérez, Andrés, 2023, Deep-sea Ophiuroidea (Echinodermata) collected during the TALUD cruises in western Mexico, Zootaxa 5259 (1), pp. 1-71 : 16

publication ID	https://doi.org/10.11646/zootaxa.5259.1.1
publication LSID	lsid:zoobank.org:pub:4306F52E-FD24-45B0-B307-66B71173D805
DOI	https://doi.org/10.5281/zenodo.7798720
persistent identifier	https://treatment.plazi.org/id/03AB87FA-FFAE-FFDA-FF7B-FF1CFC03FA5E
treatment provided by	Plazi (2023-04-03 13:18:02, last updated 2024-11-28 20:47:02)
scientific name	Astrodia excavata (Lütken & Mortensen, 1899 )
status

Treatment

Astrodia excavata (Lütken & Mortensen, 1899) View in CoL

Fig. 2A‒G View FIGURE 2

Asteronyx excavata Lütken & Mortensen, 1899: 185‒186 View in CoL , pl. 22, figs. 2‒6.—H.L. Clark 1913: 219; 1923: 157.— Döderlein 1927: 59, 98.

Astrodia excavata View in CoL . Okanishi & Fujita 2014: 192‒195, figs. 5‒7.

Material examined. 58 individuals at eight stations. TALUD IV, Sta. 19, 1 ind. (ICML-EMU-11094). TALUD VIII, Sta. 11, 1 ind. (ICML-EMU-11096). TALUD XII, Sta. 23, 1 ind. (ICML-EMU-11093); Sta. 27, 17 ind. (ICML-EMU-11114); Sta. 28, 1 ind. (ICML-EMU-11097). TALUD XV, Sta. 23, 6 ind. (ICML-EMU-11100); Sta. 24, 26 ind. (ICML-EMU-11099), 1 ind. (ICML-EMU-11101), and 3 ind. (ICML-EMU-11697). TALUD XVIB, Sta. 17, 1 ind. (ICML-EMU-11102).

Comparative material. Asteronyx excavata Lütken & Mortensen, 1899 , lectotype, 1 ind.: MCZ OPH-2817 . Paralectotype, 1 ind.: USNM 19598 About USNM . Syntype, 1 ind.: USNM 19599 About USNM (Supplementary file 2).

Description (ICML-EMU-11099). DD = 24.7 mm. Disc five-lobed, indented interradially. Dorsal disc covered with thickened skin, lacking scales. RS coarse, surrounded by epidermal ossicles, very prominent, almost reaching the center of the disc ( Fig. 2A View FIGURE 2 ). Ventral interradii covered by integument and external ossicles. Genital slits oval, restricted to proximal-middle part, elongated, covering approximately 3/4 of the interradius ( Fig. 2B View FIGURE 2 ). OSh broader than long, triangular. One madreporite, larger than OSh. AdSh broader than long, with rounded edges, meeting or almost meeting proximally. Jaws bearing six papillae at each side; OPa four, granule-like, distalmost papilla larger, rectangular-shaped; TPa two at jaw tips, spiniform, larger than OPa. Teeth several, similar to TPa ( Fig. 2C View FIGURE 2 ). Arms entirely covered by integument, coiled, thick, gradually narrowing distally. LAP located on the ventral lateral side of vertebrae, bar-like, prominent ( Fig. 2D View FIGURE 2 ). First to fourth tentacle pores lacking ArSp; fifth to ninth with one ArSp ( Fig. 2E View FIGURE 2 ); subsequent pores with 3‒4 ArSp, 2‒3 serrated, one ventralmost elongated (approximately 1.5 VAP in length), bulbous, serrated at the tip, not hooked ( Fig. 2F View FIGURE 2 ). TSc lacking. Color pattern brownish-beige (ethanol preservation) ( Fig. 2A‒G View FIGURE 2 ).

Habitat and distribution. California, USA to Mexico ( Luke 1982; Granja-Fernández et al. 2015); doubtful record in Peru ( Granja-Fernández & Hooker 2020); 267‒ 1,273 m depth ( Okanishi & Fujita 2014), associated with rocks and gorgonians (Lütken & Mortensen 1899; H.L. Clark 1923). The material examined is from off western Baja California and Baja California Sur, the southern Gulf of California, and off Colima; 530‒ 1,245 m depth, associated with unidentified gorgonians.

Remarks. In Mexico, Astrodia excavata has been recorded in western Baja California and Baja California Sur, the Gulf of California, and Marias Islands ( Granja-Fernández et al. 2015). Present records in Colima represent a significant extension of its distribution to the south (to 18º33′43″N; 103º57′45″W) in western Mexico. GranjaFernández & Hooker (2020) suggested that the Peruvian record of A. excavata is doubtful and needs taxonomical confirmation. If further revision of the material from Peru indicates that this record is incorrect, then Colima (TALUD XII, Sta. 23) will be the southernmost distribution limit for this species.

References

Clark, H. L. (1913) Echinoderms from Lower California, with descriptions of new species. Bulletin of the American Museum of Natural History, 32, 185 - 236. https: // doi. org / 10.5962 / bhl. title. 1734

Clark, H. L. (1923) Echinoderms from Lower California with descriptions of new species: supplementary report. Bulletin of the American Museum of Natural History, 48 (6), 147 - 163.

Doderlein, L. (1927) Indopacifische Euryalae. Abhandlungen der Mathematisch-Physikalischen Klasse der Koniglich Bayer Akademie der Wissenschaften, 31 (6), 1 - 105. https: // doi. org / 10.1515 / 9783486755459

Granja-Fernandez, R., Herrero-Perezrul, M. D., Lopez-Perez, R. A., Hernandez-Morales, A. & Rangel-Solis, P. D. (2015) A literature review of the Ophiuroidea (Echinodermata) from the Pacific coast of Mexico. Revista de Biologia Tropical, 63 (2), 37 - 47.

Granja-Fernandez, R. & Hooker, Y. (2020). Revisiting the diversity and distribution of the ophiuroids (Echinodermata: Ophiuroidea) from Peru. Zootaxa, 4766 (4), 539 - 556. https: // doi. org / 10.11646 / zootaxa. 4766.4.2

Luke, S. R. (1982) Catalog of benthic invertebrate collections, Echinodermata. Scripps Institution of Oceanography series, no. 82 - 5, University of California, 66 pp.

Lu ¨ tken, C. F. &. Mortensen, T. (1899) The Ophiuridae. Memoirs of the Museum of Comparative Zoology at Harvard College, 23 (2), 93 - 208.

Okanishi, M. & Fujita, T. (2014) A taxonomic review of the genus Astrodia (Echinodermata: Ophiuroidea: Asteronychidae). Journal of the Marine Biological Association of the United Kingdom, 94 (1), 187 - 201. https: // doi. org / 10.1017 / S 0025315413001331

Figures

FIGURE 2. Astrodia excavata (Lütken & Mortensen, 1899) (ICML-EMU-11099, DD = 24.7 mm). A, Dorsal disc; B, Ventral disc; C, Mouth; D, Dorsal arm; E, Proximalmost ventral arm; F, Middle ventral arm; G, Dorsal view. Ophiosphalma glabrum (Lütken & Mortensen, 1899) (ICML-EMU-11061, DD = 31 mm). H, Dorsal disc; I, Ventral disc; J, Mouth; K, Dorsal arm; L, Ventral arm; M, Dorsal view.