Ophiosphalma glabrum (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 : 16-17

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.7798722

persistent identifier

https://treatment.plazi.org/id/03AB87FA-FFAE-FFC5-FF7B-F884FB11FA13

treatment provided by

Plazi

scientific name

Ophiosphalma glabrum (Lütken & Mortensen, 1899 )
status

 

Ophiosphalma glabrum (Lütken & Mortensen, 1899) View in CoL View at ENA

Fig. 2H‒M View FIGURE 2

Ophiomusium glabrum Lütken & Mortensen, 1899: 132‒123 View in CoL , pl. 4, figs. 7‒9.—H.L. Clark 1913: 213; 1917: 449‒450.— Koehler 1922: 405.

Ophiomusium multispinum H.L. Clark, 1911: 113‒114 View in CoL , fig. 42.— Baker 2016: 31.

Ophiomusium fimbriatum Koehler, 1922: 403‒405 View in CoL , pl. 90, figs. 6‒8.— Baker 2016: 31.

Ophiosphalma glabrum View in CoL . Baker 2016: 31 View Cited Treatment , figs. 51a‒d.

Material examined. 367 individuals at six stations. TALUD XII, Sta. 8, 20 ind. (ICML-EMU-11060); Sta. 15, 3 ind. (ICML-EMU-11072); Sta. 25, 288 ind. (ICML-EMU-11061), 14 ind. (ICML-EMU-11062), 7 ind. (ICML-EMU-11066), and 3 ind. (ICML-EMU-11683). TALUD XVIB, Sta. 1, 1 ind. (ICML-EMU-11092); Sta. 9, 1 ind. (ICML-EMU-11064-A), 14 ind. (ICML-EMU-11064-B), and 2 ind. (ICML-EMU-11065); Sta. 15, 14 ind. (ICML-EMU-11063).

Comparative material. Ophiomusium glabrum Lütken & Mortensen, 1899 , syntypes, 86 ind.: MCZ OPH-452 , MCZ OPH-453 , MCZ OPH-454 , MCZ OPH-455 , MCZ OPH-780 , MCZ OPH-880 , MCZ OPH-1021 , MNHN-IE-2013-10254, USNM 19494 About USNM , USNM 19496 About USNM , USNM 19498 About USNM , USNM 19499 About USNM , USNM 19500 About USNM (Supplementary file 2).

Description (ICML-EMU-11061). DD = 31 mm. Disc pentagonal, flat. Dorsal disc covered with imbricated, irregular scales. RS longer than broad, prominent, separated by numerous elongated scales of different sizes; one triangular plate with rounded edges between each pair of RS ( Fig. 2H View FIGURE 2 ). Ventral interradii covered by oval imbricated scales, larger than dorsal scales. Genital slits with numerous quadrangular papillae ( Fig. 2I View FIGURE 2 ). OSh almost as broad as long, triangular. One irregular madreporite, slightly larger than OSh. AdSh longer than broad, elongated, broader distally, meeting in front of OSh. Jaws bearing 6‒7 papillae at each side, quadrangular, merging, two distalmost the largest; one pointed papilla at jaw tips. Teeth four, similar to papilla at jaw tips ( Fig. 2J View FIGURE 2 ). Arms gradually narrowing distally. Dorsal arm base with 3‒4 imbricated DAP, with a granular appearance, projecting laterally. DAP as long as broad, rhombic, proximally meeting and gradually separating and decreasing in size distally ( Fig. 2K View FIGURE 2 ). First VAP smaller than rest; subsequent three VAP the largest (almost covering all arm segment length), almost meeting, the only ones with tentacle pores; posterior VAP triangular, reduced in size (1/3 arm segment in length), separated from each other. LAP with 6‒9 ArSp, short (approximately 1/5 LAP in length), pointed, separated; ventralmost ArSp slightly longest than rest. Three tentacle pores with one abradial pointed TSc (approximately 3.5 arm segments in length) and 1‒2 smaller adradial TSc ( Fig. 2L View FIGURE 2 ). Color pattern beige ( Fig. 2H‒M View FIGURE 2 ), center of dorsal disc light brown (ethanol preservation) ( Fig. 2H View FIGURE 2 ).

Habitat and distribution. Widely distributed in the eastern Pacific: British Columbia, Canada, Washington, USA, Mexico, Costa Rica, Panama, Colombia, Ecuador, and Peru; 878‒ 5,203 m depth, muddy substrates (Lütken & Mortensen 1899; Luke 1982; Maluf 1988; Lambert & Boutillier 2011). The material examined was collected off western Baja California, Colima, and Guerrero; 1,858 ‒2,125 m depth.

Remarks. The specimens of the ICML-EMU-11061 lot presented some morphological differences compared to specimens of the type series, including: 1) three and rarely five tentacle pores, 2) the largest specimens can have up to 12 arm spines, and 3) some specimens have conspicuous primary plates. In Mexico, O. glabrum has been documented in western Baja California and Baja California Sur, the Gulf of California, and Oaxaca (GranjaFernández et al. 2015). The material examined herein was collected off Colima and Guerrero, representing new records for these areas, thus filling the previously known distribution gap in western Mexico.

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Echinodermata

Class

Ophiuroidea

Order

Ophiurida

Family

Ophiosphalmidae

Genus

Ophiosphalma

Loc

Ophiosphalma glabrum (Lütken & Mortensen, 1899 )

Granja-Fernández, Rebeca, Hendrickx, Michel E., Rangel-Solís, Pedro Diego & López-Pérez, Andrés 2023
2023
Loc

Ophiosphalma glabrum

Baker, A. N. 2016: 31
2016
Loc

Ophiomusium fimbriatum

Baker, A. N. 2016: 31
Koehler, R. 1922: 405
1922
Loc

Ophiomusium multispinum H.L. Clark, 1911: 113‒114

Baker, A. N. 2016: 31
Clark, H. L. 1911: 114
1911
Loc

Ophiomusium glabrum Lütken & Mortensen, 1899: 132‒123

Koehler, R. 1922: 405
Clark, H. L. 1917: 449
Clark, H. L. 1913: 213
Mortensen, T. 1899: 123
1899
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