Overview

Brief Summary

Ecology

Exists at hydrothermal vents and methane cold seeps only.
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Comprehensive Description

General Description

The disk has a diameter between 2 - 3 mm. The disk is flat and covered with small imbricating scales, without ornamentation. The radial shields are distinct with a length twice their breadth. The radial shields are contiguous along most of the length, extending halfway to the centre of the disk. The ventral inter-radial areas have small plates. Well developed arm combs are formed by up to ten small, flattened, peg-like spines, which extend onto the first dorsal arm plate with up to four spines on the plate.

The oral shields are strongly pentagonal and arrow-shaped, with the outer two sides slightly concave. The adoral shields are small, extending to just outside the wings of the oral plate. The jaw is lined by a continuous sharp-edged plate with numerous transverse striations. The second oral tentacle pore opening is just outside the mouth edge with two erect, flattened, pointed tentacle scales. One scale arises from the adoral shield, the other form the oral plate. Two (occasionally three or rarely four) long, sharply-pointed teeth are inside each jaw. The distal portions of the genital slits are partially lined with pointed papillae.

The arms are ca. four times the disk diameter, cylindrical but slightly flattened dorso-ventrally. The dorsal arm plates are oval with the distal edge notched. Most proximal arm plates have four comb papillae. The ventral arm plate has a flat distal edge whilst the proximal edge is pointed. The lateral plates are wide and meet at the mid-line on the dorsal and ventral side of the arm, separating both the ventral and dorsal arm plates. In larger individuals the ventral part of the lateral arm plates is often rugose, particularly on the distal part of the arm as a result of increased growth in the plate stereom. The tentacle pores open with two (decreasing to one distally) flattened, pointed tentacle scales. There are three (rarely four) equal-length arm spines that are less than one arm segment in length. The arm spines are conical, proximally giving way to curved, hooked spines distally.

(Tyler et al., 1995)

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Color: Pinkish to light orange on disk, cream to light orange on arms.
  • STÖHR S. & M. SEGONZAC (2005) J. Mar. Biol. Ass. UK 85: 383-402.

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Occurs within several meters of active black smokers and diffusers mainly on blocks of sulphide from collapsed chimneys; abundant on beds of mytilid bivalves Bathymodiolus spp. Appears restricted to depths below 1600 m, most abundant below 3000 m. Also abundant on Northwest Atlantic cold seeps with similar depth preference. Post-larval structures suggest planktonic development. Affinity to Bathymodiolus suggests that these ophiuroids may utilize the rich organic food source provided by the mussel pseudofeces.
  • STÖHR S. & M. SEGONZAC (2005) J. Mar. Biol. Ass. UK 85: 383-402.

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Distribution

Restricted to the (North?) Atlantic Ocean.
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Types from hydrothermal vents at Snake Pit (23°22`N, 44V56`W) and Broken Spur (29°10.01`N, 43°10.43`W) on the Mid-Atlantic Ridge bewteen 1626-3650 m depth (Tyler et al., 1995). Also found at the Florida Escarpment cold seep in the Gulf of Mexico (Turnipseed et al., 2004).

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MAR, at all hydrothermal vent sites except Menez Gwen; 1626-3650 m. Occurs also at Northwest Atlantic methane cold seeps (South Barbados).
  • STÖHR S. & M. SEGONZAC (2005) J. Mar. Biol. Ass. UK 85: 383-402.

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Physical Description

Morphology

Disk strongly indented interradially; length of radial shields about 1/4 disk diameter, contiguous for most of length; 3-4 arm spines. Jaws lined with long plate-like structure with a sharp outer edge giving the jaw an arrow-head appearance. Teeth long, sharply pointed structures with two or three on each jaw; dorsal arm plate with a distinctive proximal notch.
  • STÖHR S. & M. SEGONZAC (2005) J. Mar. Biol. Ass. UK 85: 383-402.

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Size

Disk diameter up to 5 mm.
  • STÖHR S. & M. SEGONZAC (2005) J. Mar. Biol. Ass. UK 85: 383-402.

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Ecology

Habitat

Depth range based on 21 specimens in 1 taxon.
Water temperature and chemistry ranges based on 20 samples.

Environmental ranges
  Depth range (m): 1627 - 3650
  Temperature range (°C): 2.523 - 4.255
  Nitrate (umol/L): 17.840 - 22.153
  Salinity (PPS): 34.913 - 35.039
  Oxygen (ml/l): 5.657 - 6.060
  Phosphate (umol/l): 1.148 - 1.496
  Silicate (umol/l): 13.580 - 42.727

Graphical representation

Depth range (m): 1627 - 3650

Temperature range (°C): 2.523 - 4.255

Nitrate (umol/L): 17.840 - 22.153

Salinity (PPS): 34.913 - 35.039

Oxygen (ml/l): 5.657 - 6.060

Phosphate (umol/l): 1.148 - 1.496

Silicate (umol/l): 13.580 - 42.727
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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