Ophiarachnella septemspinosa ( Müller & Troschel, 1842 )

Parameswaran, Usha V., Nowshad, B. Mohammed, Dixit, Sudhanshu, Manjebrayakath, Hashim, Idreesbabu, K. K. & Saravanane, N., 2020, New records of brittle stars (Echinodermata: Ophiuroidea) from the Lakshadweep atolls, northern Indian Ocean, with notes on Indophioderma ganapatii Sastry Marimuthu & Rajan, 2019, Zootaxa 4809 (3), pp. 560-570: 564-565

publication ID

https://doi.org/10.11646/zootaxa.4809.3.9

publication LSID

lsid:zoobank.org:pub:49205946-98C0-44E8-833B-315A1B686656

persistent identifier

http://treatment.plazi.org/id/C57D87D4-FFBA-FFBA-FF4D-FA5BC547F89F

treatment provided by

Plazi

scientific name

Ophiarachnella septemspinosa ( Müller & Troschel, 1842 )
status

 

Ophiarachnella septemspinosa ( Müller & Troschel, 1842)  

( Fig. 4 View FIGURE 4 a-f)

Ophiarachna septemspinosa Müller & Troschel, 1842: 105–106   .

Pectinura septemspinosa   — Lütken 1869: 15.— Lyman 1882: 17.— Döderlein 1888: 830–831, pl. 32(4a–c).— de Loriol 1893: 395–397, pl. 13(2).— Koehler 1905: 9.

Pectinura rigida Lyman, 1874: 224   .

Ophiarachna armata Troschel, 1879: 137–138   .

Ophiarachnella septemspinosa   —H. L. Clark 1909: 126; 1938: 349–350; 1946: 263–264.— Koehler 1930: 273.— Cherbonnier & Guille 1978: 218–219, pl. 16(1–2).— Guille & Vadon 1985: 64.— Marsh et al. 1993: 62.— Olbers et al. 2015: 110–111, fig. 9(A–B).— Boissin et al. 2016: 288–289, fig. 5(e).

Material examined: Agatti Island—western reef (10° 51.97’ N, 72° 12.42’ E, 20m), coll. S. Dixit on 06.11.2018 by SCUBA diving, 1 specimen ( CMLRE IO /SS/ECD/00235) GoogleMaps   .

Description: D.d. 36 mm, disc pentagonal, arms 7–8 times d.d. Disc covered uniformly with rounded granules, on dorsal and ventral side, leaving only small, dark, circular radial shields bare ( Fig 4 View FIGURE 4 a-c). Oral shield large, spear- head shaped, longer than broad; supplementary oral shields small, broadly oval, some bare; adoral shields small, triangular, not contiguous; oral plates covered by granules ( Fig. 4d View FIGURE 4 ). Teeth broadly rounded; 1–2 large, rounded, scale like tooth papillae, followed by three scale-like oral papillae—corresponding with infradental papilla, secondary adoral shield spine and adoral shield spine; Lyman’s ossicle projecting between the latter and the first ventral arm plate ( Fig. 4d View FIGURE 4 ). Genital slits long, reaching edge of the disc ( Fig. 4d View FIGURE 4 ). Dorsal arm plates rectangular, faintly carinate, over twice as wide as long, distal edge distinctly scalloped ( Fig. 4 View FIGURE 4 b-c). Ventral arm plates with concave inner and convex outer margins ( Fig. 4 View FIGURE 4 d-e). Arm spines increasing from two to nine in the basal segments; spines adpressed, flat and pointed; spines as long as segment, except the ventral-most which is twice as long, distinctly flattened with squared-off tips ( Fig. 4 View FIGURE 4 e-f). Two rounded leaf-like tentacle scales basally, becoming one distally ( Fig. 4e View FIGURE 4 ).

Colour: In life, uniformly greyish-green with dark green radial shields; preserved specimen dull grey with dark brownish-grey radial shields.

Distribution: Saudi Arabia, Kenya, South Africa, Madagascar, Reunion, Mauritius, Maldives, Sri Lanka, Indonesia, Christmas Island, Papua New Guinea, Australia, New Caledonia, Fiji, Philippines, Japan; intertidal to 50m ( OBIS, 2020c).

Remarks: This species has never previously been collected from Indian waters, and therefore does not appear in the detailed annotated list of Indian echinoderms compiled by Sastry (2007). It has been recorded from Sri Lanka by Döderlein (1888) and from the Maldives by Clark & Davies (1965). James (1986), thus, included it in his table of shallow-water species from ‘Indian Seas’, with positive records for ‘Sri Lanka’ as well as the ‘ Maldives & Lakshadweep’ regions. Based on this, Samuel et al. (2017) erroneously included it in their ‘updated checklist of echinoderms from Indian waters’. However, the present collection represents the first valid report of this species from the India’s exclusive economic zone (EEZ).

IO

Instituto de Oceanografia da Universidade de Lisboa

Kingdom

Animalia

Phylum

Echinodermata

Class

Ophiuroidea

Order

Ophiurida

Family

Ophiodermatidae

Genus

Ophiarachnella

Loc

Ophiarachnella septemspinosa ( Müller & Troschel, 1842 )

Parameswaran, Usha V., Nowshad, B. Mohammed, Dixit, Sudhanshu, Manjebrayakath, Hashim, Idreesbabu, K. K. & Saravanane, N. 2020
2020
Loc

Ophiarachnella septemspinosa

Boissin, E. & Hoareau, T. B. & Paulay, G. & Bruggemann, J. H. 2016: 288
Olbers, J. M. & Samyn, Y. & Griffiths, C. L. 2015: 110
Marsh, L. M. & Vail, L. & Hoggett, A. K. & Rowe, F. W. E. 1993: 62
Guille, A. & Vadon, C. 1985: 64
Cherbonnier, G. & Guille, A. 1978: 218
Clark, H. L. 1946: 263
Clark, H. L. 1938: 349
Koehler, R. 1930: 273
Clark, H. L. 1909: 126
1909
Loc

Ophiarachna armata

Troschel, F. H. 1879: 138
1879
Loc

Pectinura rigida

Lyman, T. 1874: 224
1874
Loc

Pectinura septemspinosa

Koehler, R. 1905: 9
De Loriol, P. 1893: 395
Doderlein, L. 1888: 830
Lyman, T. 1882: 17
Lutken, C. F. 1869: 15
1869
Loc

Ophiarachna septemspinosa Müller & Troschel, 1842: 105–106

Muller, J. H. & Troschel, F. H. 1842: 106
1842