Amphiophiura oligopora (H.L. Clark, 1913 )

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 : 25-27

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.7798736

persistent identifier

https://treatment.plazi.org/id/03AB87FA-FFB9-FFCF-FF7B-FB0DFE30FD6A

treatment provided by

Plazi

scientific name

Amphiophiura oligopora (H.L. Clark, 1913 )
status

 

Amphiophiura oligopora (H.L. Clark, 1913) View in CoL

Fig. 5G‒L View FIGURE 5

Ophiura oligopora H.L. Clark, 1913: 210‒211 , pl. 35, figs. 8‒9.

Material examined. 74 individuals in seven stations. TALUD VIII, Sta. 3, 1 ind. (ICML-EMU-11128-B). TALUD XII, Sta. 23, 2 ind. (ICML-EMU-11129-A); Sta. 28, 67 ind. (ICML-EMU-11139). TALUD XV, Sta. 5C, 1 ind. (ICML-EMU-11131-A); Sta. 24, 1 ind. (ICML-EMU-11131-C). TALUD XVIB, Sta. 23, 1 ind. (ICML-EMU-11132-A); Sta. 28, 1 ind. (ICML-EMU-11132-B).

Comparative material. Ophiura oligopora H.L. Clark, 1913 , holotype: USNM 31641 About USNM . Paratype, 1 ind.: MCZ OPH-3618 (Supplementary file 2).

Description (ICML-EMU-11139). DD = 9.4 mm. Disc pentagonal with a central depression. Dorsal disc covered by irregular oval scales. Primary plates oval, conspicuous, separated from each other. RS longer than broad, triangular, separated by large scales, only meeting distally; one oval plate at disc margin between each pair of RS ( Fig. 5G View FIGURE 5 ). Ventral interradii covered by few scales, similar size to dorsal scales. Genital slits with minute, pointed genital papillae, projecting dorsally and forming discrete arm combs with small, rounded papillae ( Fig. 5H View FIGURE 5 ). OSh longer than broad, pentagonal proximally, quadrangular with rounded edges distally. Madreporite not evident. AdSh longer than broad, elongated, slender, meeting in front of OSh. Jaws bearing five papillae at each side; BSc rectangular, very elongated; IPa similar to BSc but smaller; 2IPa quadrangular, elongated; TPa two pointed, apicalmost the largest. vT pointed, more large than oral papillae. Preceding ossicles separated by a diastema; one AdShSp, two 2AdShSp, rounded ( Fig. 5I View FIGURE 5 ). Arms gradually narrowing distally. First three DAP broader than long, overlapping; subsequent DAP longer than broad, trapezoidal, meeting ( Fig. 5J View FIGURE 5 ). VAP broader than long, oval, separating and decreasing in size distally ( Fig. 5K View FIGURE 5 ). LAP with three ArSp, short (approximately 1/5 LAP in length), pointed, dorsalmost the longest, often widened at the tip ( Fig. 5J View FIGURE 5 ). First tentacle pore with three rounded TSc; subsequent tentacle pores with one and none TSc distally ( Fig. 5K View FIGURE 5 ). Color pattern beige-whitish ( Fig. 5G‒L View FIGURE 5 ). RS and large plate between them and arms with dark brown tint (ethanol preservation) ( Fig. 5G, J View FIGURE 5 ).

Habitat and distribution. Only known in western Mexico; 772‒ 1,532 m depth, sandy and muddy substrates (H.L. Clark 1913; Granja-Fernández et al. 2015; see Remarks). The material examined was collected off western Baja California and Baja California Sur, in the southern Gulf of California, and off Colima; 772‒ 1,532 m depth.

Remarks. Amphiophiura oligopora requires revision since the genus Amphiophiura is characterized by having massive oral shields ( Matsumoto 1917), a character absent in A. oligopora . It is therefore reported herein as a doubtful member of this genus. The only previously known material of A. oligopora corresponds to the type material (holotype and one paratype) collected in the southern Gulf of California at 1,152 m depth (H.L. Clark 1913). The finding of new material of this species at six localities during the TALUD cruises is therefore very relevant since it represents the only non-type material available to date. It represents new distribution range limits to the north (31º22′00″N; 117º01′60″W) and to the south (18º33′43″N; 103º57′45″W) as well as a new bathymetric distribution range (772‒ 1,532 m).

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Echinodermata

Class

Ophiuroidea

Order

Ophiurida

Family

Ophiopyrgidae

Genus

Amphiophiura

Loc

Amphiophiura oligopora (H.L. Clark, 1913 )

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

Ophiura oligopora H.L. Clark, 1913: 210‒211

Clark, H. L. 1913: 211
1913
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