Echinodermata of Lakshadweep, Arabian Sea with the description of a new genus and a species Sastry, D. R. K. Marimuthu, N. Rajan, Rajkumar 89BDB (Lamarck) Lamarck 1816 [861,1232,1655,1681] Crinoidea Tropiometridae Tropiometra Animalia Comatulida 6 Echinodermata species carinata  1971.  Tropiometra carinata: Clark, A.M. and Rowe, F.W.E. Monograph of shallow-water Indo-West Pacific echinoderms. 10-11 (distribution) and 25 (key). 2007.  Tropiometra carinata: Sastry, D.R.K. Rec. Zool. Surv. India, Occ. Paper No. 271: 19  Material:  AGN. DT.  20.11.2018. One spec.AG-26 A. Dt.    03.02.2018. One spec. KA-40. Dt.   15.02.2018. One spec. KA-  48. Dt.  15.02.2018. One spec. KA-50. Dt.  15.02.2018. Two specs. KP-14.Dt.  20.02.2018. One spec. KP-12.Dt.  20.02.2018. Three spec. KP-25. Dt.  21.02.2018. Two specs. KP-36. Dt.    21.02.2018. Three specs. KP-2. Dt.   20.02.2018. One spec. KP-5. Dt.   20.02.2018. Four specs. KP-7. Dt.   20.02.2018. Two specs. KP-26.Dt.   21.02.2018. One spec. KP-27.Dt.   21.02.2018. Two specs. KV-26. Dt.   03.12.2018. One spec. PMPN18. Dt.    22.11.2018.Two specs. KP28. Dt. 21.02.2018. Four specs.  Description: Arms 10, 35-80 mmlong. Pinnules stiff and prismatic, gradually become shorter and slender. Cirri 10-15, sometimes robust and short, with 11 to 16 segments, distal segments transversely thickened dorsally mostly at the distal margin. Cirri and distal segments with transverse dorsal thickening.  Remarks: One specfrom B-35. Dt. 4.2.2018has 10 arms of 40 mmlength and very slender and long cirri with up to 20 segments. Distal cirrus segments have the dorsal thickening like a projection towards distal sometimes appearing almost like a spine.  Distribution: Lakshadweep, Kerala, Tamil Naduand Andhra Pradesh. Elsewhere:Red Sea and East coast of Africa to East Indies. The species is newly recorded from Lakshadweep. Class ASTEROIDEA Order VALVATIDA Family ACANTHASTERIDAE   Acanthaster planci(Linnaeus) (Pl. III. Fig. a,b) 1758.  Asterias planci: Linnaeus, C. Systema Naturae.Ed. 10: 823. 1840.  Echinaster ellisiGray, J.E. Ann. Mag.  nat. Hist. 6(1): 281. WoRMS 1971.  Acanthaster planci: Clark, A.M. and Rowe, F.W.E. Monograph of shallow-water Indo-West Pacific echinoderms,p. 71 (key), p. 38-39 (distribution). 1991.  Acanthaster planci: Sastry. D.R.K. State Fauna Series 2: Fauna of Lakshadweep, p. 372. 1993.  Acanthaster planci: Clark, A.M. Echinoderm studies. 4: 323. 2007.  Acanthaster planci: Sastry, D.R.K. Rec. zool. Surv. IndiaOcc. Paper No.271: 67  Material: AG-4. Dt.  03.02.2018 One spec. MCYN18-127. Dt.  28.11.2018. One spec.Arms 15, R/r = 40/ 15 mm, spines long.  Distribution: Goa, Lakshadweep, Andamans and Nicobars. Elsewhere: Tropicopolitan, Red Sea and East Africa to Hawaiian Island, in the Indo-west Pacific, Galapagos Islands to Gulf of California in the East Pacific with  Echinaster ellisi(Gray)as a synonym as per WoRMS. [275,768,298,324] 2018-11-20 AGN A. Dt 7 1 [133,441,334,360] 2018-03-02 KA 7 KA-40 1 [490,771,334,361] 2018-02-15 KA- 7 1 2018-02-15 2018-02-21 2018-02-15 KA, KP 7 KA-50, KP-14, KP-12, KP-25, KP-36 5 [133,514,478,504] 2018-02-21 KP 7 KP-2 1 2018-02-20 KP 7 KP-5 1 [243,592,514,540] 2018-02-20 KP 7 KP-7 1 2018-02-20 KP 7 KP-26 1 [312,646,550,576] 2018-02-21 KP 7 KP-27 1 2018-02-21 KV 7 KV-26 1 [383,768,586,612] 2018-03-12 PMPN 7 PMPN18 1 [133,474,622,648] 2018-11-22 KP 7 KP28 1 [970,1469,216,238] 2018-03-02 MCYN 7 MCYN18-127 1