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The Echinoids of Easter Island (Rapa Nui)L

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The Echinoids of Easter Island (Rapa Nui)L Pacific Science (1974), Vol. 28, No.2, p. 147-158 Printed in Great Britain The Echinoids of Easter Island (Rapa Nui)l F. JULIAN FELL2 ABSTRACT: The known echinoid fauna of Easter Island now comprises seven species. Four of them, Tripneustes gratilla, Echinostrephus sp., crypeaster reticulatus, and Brissus agassizii are reported here from Easter Island for the first time, Trip­ neustes gratilla apparently being represented by a previously unknown variant. The value of the pedicellariae and the heavily plated peristome as specific differences in the genus Tripneustes is questioned. Comparison of Easter Island material with specimens from other parts of the Pacific supports the synonymy of Brissus meri­ dionalis with Brissus agassizii. One of the previously reported species, Echinometra insularis, is herein restricted to Easter Island, reports of its occurrence elsewhere being based upon erroneous identifications. The reported occurrence of Diadema mexicanum at Easter Island is discounted. THE REMOTENESS of Easter Island has caused insularis, and Brissus agassizii. In January and much curiosity about its faunistic affinities and February 1969, Dr. John E. Randall and Gerald yet has made collections there very infrequent R. Allen, on an ichthyological expedition until relatively recently. This paper was sponsored by the National Geographical So­ written in 1968 as a Medical Expedition to ciety, collected some specimens of Echinometra Easter Island (M.E.T.E.I.) report but delays insularis. In January 1971, Dr. Richard U. have enabled the inclusion of material from Gooding collected some echinoids (which I various other sources. have not examined) and made some observa­ The first echinoids recorded from Easter tions which he has contributed for this paper. Island were collected by the U.S.S. Albatross These collections, although small, confirm Expedition in December 1904 (Agassiz and that this eastern Pacific island has an Indo-West­ Clark 1908; H. L. Clark 1912, 1917). Only three Pacific affinity. species were found, one being the widely I wish to thank the following for their distributed Echinoneus ryclostomuJ', another being assistance to this study. Professor I. E. Efford, the Indo-West-Pacific Diademasavig'!)li, and one University ofBritish Columbia, permitted me to a new species, Echinometra insularis, which Clark report on the M.E.T.E.I. collection. Dr. R. H. (1912) also reported from Socorro Island. Chesher loaned me material of Brissus from However, as shown below, the record from Panama and gave valuable advice on problems Socorro proves to be incorrect. No further presented by the genus. Miss M. E. Downey references to Easter Island Echinoidea have and Dr. D. L. Pawson ofthe Smithsonian Insti­ been noted in the Zoological Record. tution, Drs. G. Nogrady of Montreal, E. C. Since the Albatross collections the following Allison of San Diego State College, C. W. sources have yielded echinoids from Easter Allison of the University of Alaska, J. H. Peck Island. In February 1958, the D01vnwind Expedi­ of the University of California at Berkeley, and tion from Scripps Institution of Oceanography D. P. Kelso of George Mason University, Vir­ collected a specimen of crypeaster reticulatus. In ginia, assisted me with a number of loans. Dr. January and February 1965, Dr. Ian E. Efford Kelso also supplied data on Hawaiian Echino­ and John A. Mathias of M.E.T.E.I. collected metra. Dr. Richard U. Gooding has sent me specimens of Tripneustes gratilla, Echinometra some of his observations, which have been included. Dr. Alan N. Baker of the National Museum, Wellington, New Zealand, assisted I Manuscript received 25 May 1973. 2 Department of Zoology, University of Maine at with the genus Diadema. Professor H. B. Fell at Orono, Orono, Maine 04473. the Museum ofComparative Zoology, Harvard 147 148 PACIFIC SCIENCE, Volume 28, April 1974 (MCZ) and D. Keith Serafy assisted in the prepa­ (which is used in other islands only for diadema­ ration of the manuscript. NSF grants GB 3532 tids) applies on Easter Island to Tripneustes, to H. B. Fell and GV 24157 to J. H. Dearborn while 'hetuke patia' is used for this species." provided the facilities used in this study. Mortensen (1940: 277) reported Diadema mexicanum from Easter Island. This author considers the occurrence of a tropical west SYSTEMATICS American echinoid at Easter Island to be most unlikely, although confusion between D. FAMILY DIADEMATIDAE savig'!Ji, D. antil/arum, and D. mexicanum is Regular echinoids with aulodont lantern. very possible as these species may be reliably Ambulacral plates trigeminate, compounded in distinguished only by their tridentate pedicellar­ diadematoid fashion. Primary tubercles per­ iae. Mortensen (1940: 254) referred to them as forate and crenulate. Primary spines hollow and "geographical species." Dr. Gooding collected verticillate. a Diadema at Easter Island and sent it to Alan Baker, who (personal communication) found Diadema Gray, 1825 no mexicanum-type pedicellariae. Primary ambulacral tubercles in two vertical series, regular throughout. Globiferous pedi­ FAMILY TOXOPNEUSTIDAE cellariae absent. No spines on buccal plates. Regular camarodont echinoids with deep Diadema savig'!Ji (Audouin) gill slits. Valves of globiferous pedicellariae without any side teeth below terminal tooth. Syno'!Jmy Cidarites savig'!Ji-Audouin 1826: 13; Diadema Tripneustes L. Agassiz, 1814 savig'!Ji-Agassiz and Clark 1908: 114, Morten­ sen 1940: 265 (complete synonymy). Ambulacral plates trigeminate, the com­ pounded plates very low and wide so that there is only one primary tubercle to every three or Type Locality four compound plates. Pore zones wide with Egypt (Red Sea). three vertical series ofpore pairs. Genus occurs in all tropical oceans. Type Specimen Tripneustes gratilla (Linnaeus) Unknown. Audouin (in J. C. Savigny 1826) gave the name Cidarites savig'!Ji to a Diadema Fig. la, 19 illustrated by M. J. C. Savigny. Mortensen Syno'!Jmy (1940: 268) gave reasons why this drawing is taken to be what is now known as Diadema Echinus gratil/a-Linnaeus 1758: 664; Trip­ savig'!Ji. neustesgratil/a-Mortensen 1943a: 500 (complete synonymy). Remarks Type Locality Dr. R. U. Gooding has reported of D. "Habitat in O. Indico." savig'!Ji (personal communication) that" speci­ mens were found in a rockpool at the entrance of Hanga-Piko Bay in 1 m and on top of or on Type Specimen the protected sides ofrockridges closeandparal­ The type specimen was in the collection of lel to the mouth (S. side) of the bay off Vaihu Queen Louisa Ulrika. Linnaeus examined this in 2-3 m. It is not eaten locally, being said to collection in 1751, 1752, and 1754. He hoped to cause a swelling and blistering of the mouth. publish a report on the queen's collection The gonads were rather bitter in one that was before 1758 in order to quote the more detailed tasted. The general polynesian term 'vana' descriptions in the Systema Naturae, 10th The Echinoids of Easter Island-FELL 149 FIG. 1. A, G, Tripnetlstes gratilla: A, aboral aspect, MCZ 8331,122 mm diameter; G, heavily plated peristome of Easter Island specimen, MCZ 8333, peristome diameter 45 mm. B, Ecbinometra instllaris: aboral aspect, MCZ 4045, paralectotype, test diameter 38 mm. C, D, Ecbinonetls cyclostomtls: C, aboral aspect and D, oral aspect, MCZ 8233, test length 34 mm. E, F, CO'Peaster reliCt/latlls: E, aboral aspect and F, oral aspect, test length 55 mm. 10 HPS 28 150 PACIFIC SCIENCE, Volume 28, April 1974 edition. However, his report was delayed until The other four specimens are quite unlike the 1764 and then it was published without the first. One of these (MCZ 8330), an almost com­ plates he originally had hoped to include. In pletely denuded test with the peristome intact 1803 the queen's collection was transferred and with a few tube feet, spines, and pedi­ from the palace at Dr6ttningholm to the Uni­ cellariae attached, has a diameter of 155 mm versity Museum at Uppsala. Loven (1887: 75) and a height of92 mm. The largest specimen of reported that the type was missing. T. gratilla recorded (Baker 1968) measures 149 mm diameter of test. Two others (MCZ Material Examined 8331, MCZ 8332) of these four retain the spines and pedicellariae. The tests of these four EASTER ISLAND-five specimens collected by specimens all are closely covered with numer­ M.E.T.E.I.: MCZ 8329-8330, Anakena, 2-25 ft ous, rather small, primary tubercles in regular (1-8 m), "notfrom closed offtide pools," 15-16 vertical and horizontal series in the inter­ Jan. 1965; MCZ 8331-8333, off Hanga-Roa, ambulacra on and below the ambitus. This 5-10 ft (1-3 m), 2 Feb. 1965. regularity (especially in the horizontal rows) Also specimens in the MCZ collection from disappears aborally except on the smallest other central and eastern Pacific localities, these specimen (MCZ 8333, 97 mm diam.), where it including: ceases at the ambitus. The test is densely cover­ SOCIETY ISLANDS-MCZ 1384, Society Islands, ed by spines, which do not exceed 12 mm on the two specimens. adoral side and 8 mm on the ambitus and the aboral side. The spines taper distad, but termi­ TUAMOTU ARCHIPELAGo-MCZ 3949, Fakarava, nate abruptly with a blunt end. On the adoral Albatross collection, two specimens. side of the test the spines are light gray; on the HAWAIIAN ISLANDS-MCZ 990, Hawaiian Is­ aboral side they are brownish, becoming darker lands, one specimen; MCZ 1389, Hawaiian at the tips. The aboral median areas of the Islands, one specimen; MCZ 4030, reefin front of interambulacra are not bare, as is commonly the Honolulu, Oahu, Albatross collection, 1901, case in T. gratilla, but are covered with short, three specimens; MCZ 4031, Puako Bay, west dark brown spines. The peristomes of all four coast of island of Hawaii, Albatross collection, specimens are covered by numerous, thick, 1902, three specimens; MCZ 1383, Hawaiian irregularly scattered plates that carry numerous Islands, six specimens; MCZ 7024, Honolulu, pedicellariae and a few small spines (Fig.
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