Echinometra

Arachchige, Gayashan M., Jayakody, Sevvandi, Mooi, Rich & Kroh, Andreas, 2019, An annotated species list of regular echinoids from Sri Lanka with notes on some rarely seen temnopleurids, Zootaxa 4571 (1), pp. 35-57 : 41

publication ID

https://doi.org/10.11646/zootaxa.4571.1.3

publication LSID

lsid:zoobank.org:pub:BC125BE1-02D7-4756-BD63-DE0C4919CBAB

DOI

https://doi.org/10.5281/zenodo.5929016

persistent identifier

https://treatment.plazi.org/id/EF6D87EE-C063-2B1E-FF60-FEB8E0CBFB90

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Plazi (2019-03-26 05:18:13, last updated 2024-11-26 08:02:35)

scientific name

Echinometra
status

 

Echinometra View in CoL ex grupo mathaei (Blainville, 1825)

Material studied. WUSL/ER/225 (dry, denuded) from Hiriketiya, WUSL/ER/226 (dry, denuded) from Hikkaduwa; WUSL/ER/227 (wet, with spines) from Beruwala.

Literature records for Sri Lanka. Clark (1915, 1925), Price & Rowe (1996), Fernando (2006), Jayakody (2012), Gayashan & Jayakody (2012).

Distribution in Sri Lanka. Southern and western coasts of Sri Lanka.

Recorded depth range in Sri Lanka. 0.5– 1 m (present study), 0.5– 5 m (previous records).

Habitat. Rocky shores, in rock crevices, among rock boulders, channels, and self-made burrows.

Observed occurrence in this study. Southern coast (Hiriketiya and Hikkaduwa) and the western coast (Beruwala) of Sri Lanka.

Remarks. E. mathaei can be distinguished from the other Sri Lankan echinometrids, except from E. oblonga , in having the test elongated through the axis between ambulacrum I and interambulacrum 3, and only four pore pairs in the pore arcs of the ambulacra.

E. mathaei and E. oblonga cannot be easily distinguished from each other. Mortensen (1943b: 394) admits that “there are no reliable characters in the test distinguishing oblonga from the typical mathaei ”. Hence, molecular analyses are required to distinguish these species unequivocally, although sperm morphology and spicules have been shown to be very useful in distinguishing some members of the E. mathaei species complex (Arakaki et al. 1998; Bronstein & Loya 2013).

Two colour variants, green and brown, occur in Sri Lanka. There is a high likelihood that more than one species is present on the island, pending full molecular analyses of additional specimens from across the range of echinometrids currently listed under the names E. mathaei and E. oblonga .

Clark, H. L. (1915) The echinoderms of Ceylon other than holothurians. Spolia Zeylanica, 10, 83 - 102.

Clark, H. L. (1925) A Catalogue of the Recent Sea-Urchins (Echinoidea) in the Collection of the British Museum (Natural History). Oxford University Press, London, 250 pp.

Fernando, M. (2006) Coral associated invertebrates: An overview of the current taxonomic status. In: Bambaradeniya, C. N. B. (Ed.), The Fauna of Sri Lanka. Section 3. Status of Marine Fauna in Sri Lanka. IUCN-The World Conservation Union, Gland and Cambridge, pp. 259 - 273.

Gayashan, M. A. & Jayakody, S. (2012) Diversity and density of sea urchins populations in rocky shores off Nilwella in Southern province of Sri Lanka. Sri Lanka Journal of Aquatic Science, 17, 35 - 46. https: // doi. org / 10.4038 / sljas. v 17 i 0.6854

Jayakody, S. (2012) Provisional checklist of sea urchins (Echinodermata: Echinoidea) of Sri Lanka. In: Weerakoon, D. K. & Wijesundara, S. (Eds.), The National Red List 2012 of Sri Lanka; Conservation Status of the Fauna and Flora. Ministry of Environment, Colombo, Sri Lanka, pp. 370 - 372.

Mortensen, T. (1943 b) A Monograph of the Echinoidea III. 3, Camarodonta. II. Echinidae, Strongylocentrotidae, Parasaleniidae, Echinometridae. C. A. Reitzel, Copenhagen, 446 pp.

Price, A. R. G. & Rowe, F. W. (1996) Indian Ocean echinoderms collected during the Sindbad Voyage (1980 - 81), 3. Ophiuroidea and Echinoidea. Bulletin of the Natural History Museum, Zoology Series, 62, 71 - 82.