The Shallow-water Crinoid Fauna of Lakshadweep Atolls, North-western Indian Ocean
Author
Mohammednowshad, B.
Department of Science and Technology, Kavaratti- 682555, Union Territory of Lakshadweep, India. & School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi, 682506 Kerala, India.
Author
Idreesbabu, K. K.
Department of Science and Technology, Kavaratti- 682555, Union Territory of Lakshadweep, India.
Author
Parameswaran, Usha V.
Centre for Marine Living Resources & Ecology, Kendriya Bhavan, Kakkanad, Kochi- 682 037, Kerala, India.
Author
Messing, Charles G.
Nova Southeastern University, Halmos College of Natural Sciences and Oceanography, 8000 N Ocean Drive, Dania Beach, FL 33004 USA.
Author
Sureshkumar, S.
School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi, 682506 Kerala, India.
text
Zootaxa
2020
2020-06-08
4789
1
247
265
journal article
10.11646/zootaxa.4789.1.9
1175-5326
3884945
376263E2-07B2-4B4B-A8E3-C718FE0FC969
Stephanometra
A.H.
Clark, 1909d
Type
species.—
Antedon monacantha
Hartlaub, 1890
(a junior synonym of
Stephanometra indica
(
Smith, 1876
)
.
Diagnosis.—
A genus of
Mariametridae
with centrodorsal convex discoidal with gently sloping sides; cirrus sockets encroaching on aboral pole; brachitaxes well-separated; brachitaxis ossicles bearing rounded adambulacral processes oriented parallel or oblique to longitudinal axis of ossicle and producing characteristically scalloped or knobbed lateral margins; cirrals <40; distal cirral aboral ornamentation ranging from slight carination to prominent spine; one or more pairs of oral pinnules with reduced ambulacral groove, flattened articular facets, reduced tissue between pinnulars, conical tip, and with LW of middle pinnulars 1.5–4.0; P2 of 8 to 18 pinnulars; up to 40 arms (usually 30 or fewer) (modified from
Rankin & Messing, 2008
).
Remarks.—
Rankin & Messing (2008)
reduced the six species recognized by A.H.
Clark (1941)
and A.M.
Clark & Rowe (1971)
to two species:
S. tenuipinna
(
Hartlaub, 1890
)
and
S. indica
.