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The Sequence of Origin of the Postmetamorphic Rays in Heliaster and Labidiaster (Echinodermata: Asteroidea)

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The Sequence of Origin of the Postmetamorphic Rays in Heliaster and Labidiaster (Echinodermata: Asteroidea) Revista Chilena de Historia Natural 73:573-578, 2000 The sequence of origin of the postmetamorphic rays in Heliaster and Labidiaster (Echinodermata: Asteroidea) Origen sequencial de los rayos postmetamorficos en Heliaster y Labidiaster (Echinodermata: Asteroidea) PATRICIO SANCHEZ R* ABSTRACT Postmetamorphic rays in Heliaster and Labidiasteroriginate in four 'quadrants' between the five primary rays, and not normally in the madreporic interradius. The rays originate in one of two very definite sequences depending on the species. H. kubiniji and H. multiradiatus share one sequence, whereas H. canopus, H. helianthus and Labidiaster share the other sequence. Pycnopodia, Rathbunaster, Heliaster and Labidiaster add rays at far greater sizes and in a manner that is distinctive from other multiradiate starfish, possibly indicating a new taxonomic unit. Key words: Echinodermata, development, symmetry, Heliaster, Labidiaster. RESUMEN Los rayos post-metam6rficos en Heliaster y Labidiaster se originan en cuatro"cuadrantes" entre los cinco rayos primarios, y no como ocurre normalmente en el interradio del madreporito. Los rayos se originan en una de dos secuencias definidas, dependiendo de la especie. H. kubiniji y H. multiradiatus comparten una secuencia, mientras que H. canopus, H. helianthus y Labidiaster comparten otra secuancia. Pycnopodia, Rathbunaster, Heliaster y Labidiaster adicional rayos de tamaiios mucho mayores y de una manera que es distintiva de aquel de otras estrellas de mar multiradiadas, posiblemente indicando su pertenencia a una nueva unidad taxon6mica. Palabras clave: Echinodermata, desarrollo, simetrfa, Heliaster, Labidiaster. Santiago, March 9, 1976 1960. As things are in this part of the world, the Proceedings of this Congress were never published I did in fact investigate the origin of new, completely and my report has remained postmetamorphic rays in Heliaster during a unpublished so far. I myself became involved in residence at the MCZ [Museum of Comparative other projects, which prevented me from preparing Zoology, Harvard University], back in 1958-59. I a text to be published elsewhere. Moreover, I was was led to this on finding a specimen of H. hopeful at that time to make a sizable collection helianthus, in Chile, with several small rays of really young specimens in order to settle one regularly spaced every third large ray. Reviewing final question which had remained unanswered, the literature, HL Cl ark's (1907) conclusion that in spite of the collections I had examined in the rays originate with no definite order seemed USA - including one I left at the MCZ - which untenable, in view of my specimen. Yet it took me were mostly of large or medium size Heliaster. It a long time and the examination of very many turned out that very small specimens are difficult specimens before I came to the answer, for the to find in large numbers and it is only after years sequence is not simple. I reported my findings in of field work that I have of late come across a seminars and lectures at several universities in 'nursery ground' which has provided the material the USA at that time (see: Emery Swan's comment necessary for the purpose. So I am now back to on page 410 of Boolootian' s Physiology of this research and giving the final touches to my Echinodermata) (Swan 1966, Boolootian 1966) manuscript. and I presented a formal account at the 1st. Chilean The sequence of origin of postmetamorphic Zoological Congress in Santiago, September of rays is not simple in Heliaster, being 'obscured' *Passed away on February 23, 1999. This paper was edited by Frederick H. C. Hotchkiss, 26 Sherry Road, Harvard, MA 01451 USA, from two letters. 574 SANCHEZ by at least two factors: individual variability and spaces A-B, B-C, D-E and E-A but, surprisingly regeneration of rays. Yet I will try to provide you enough, the sequence is not exactly the same in with the core of the answer, in anticip'ition of the all Heliaster species. In H. kubinzji and H. full story. multiradiatus, the sequence is the same as 1. HL Cl ark ( 1907) was correct in assuming that described by Ritter & Crocker (1900) for new rays originate in four of the original interradial Pycnopodia helianthoides, but in these Heliaster spaces (A-B, B-C, D-E, E-A) and not normally species the process occurs in four regions, as between the original rays C and D, the five origi- mentioned. In all the other species (including H. nal rays being those with gastric muscles (rays canopus, which grows up to some 25 rays, as do are lettered such that the madreporite is between H. kubinji and H multiradiatus), the sequence is rays C and D). He was also correct that certain another. I trust the difference can be easily grasped territories or quadrants have different activity on examining the illustration from my manuscript rates, in that new rays appear earlier and/or grow which is enclosed (Fig. 1 ). As this illustration faster in some of the original interradial spaces, shows, the 'age' of the rays can be recognized by as illustrated in his plate no. 8.1t is my conviction their differences in length (very small rays not that Clark was mistaken in concluding that rays shown there) and also by the alignment of the originate in no definite order in those four marginal aboral spines in the proximal portion of interradial spaces. Furthermore, it seems to me rays, even if of equal size. New rays are numbered that the 'gradients' of new-ray-growth found by 1, 2, 3 in this figure, implying the order of their Clark in H. kubiniji (his plate 8) do not hold alike appearance in each original interradial space (B- for all the species of the genus. C in this figure); first one grows, then pairs, but 2. New postmetamorphic rays originate in very this last statement requires qualification (see definite sequences in the original interradial below). D C D c 3 2 0 oo Oo Oo oo oo Oo o oo •o o 0ooO 0 o 0oooo 0 ··---.~ ..... ooooooo o~~~~~~------------- 00 Oo OOooO 0 0000 B 0 o o o 0 oo0000006------- H. kubiniji H. canopus Fig. 1. The two sequences of origin of rays in Heliaster in aboral view. The C-D madreporic interradius does not develop postmetamorphic rays. For simplicity the ray addition is shown for only the B-C 'quadrant'. New rays are numbered in the order of their appearance. First one ray grows, then pairs, so the numbering is 1, 2 (twice), 3 (twice). In H. canopus (right side of Fig. I) new rays 3 arise between the two most recently formed rays 2 and 1. In H. kubiniji (left side of Fig. 1) new rays 3 arise between the most recently formed rays 2 and the adjacent primary rays B and C. The new rays can be recognized by the alignment of the marginal aboral spines in the proximal portion: toward the disk their full development is blocked by the preexisting rays. Drawing by Prof. Sanchez, prepared for publication courtesy of Dr. Rich Mooi. Las dos secuencias de origen de rayos en Heliaster en vista aboral. El interradio madreporitico C-D no desarrolla rayos postmetam6rficos. Para efectos de simplicidad se muestra la adici6n de rayos solo para el "cuadrante" B-C. Los rayos nuevos estan numerados en orden de aparici6n. Primero crece un rayo, luego en pares. Asf, la numeraci6n es 1, 2 (doble), 3 (doble). En H. canopus (derecha de Fig. I) el nuevo rayo 3 apareci6 entre Ios recientemente formados rayos 1 y 2. En H. kubiniji (izquierda de Fig. I) el rayo nuevo 3 apareci6 entre el rayo 2 recientemente formado y el rayo primario adyacente B y C. Los rayos nuevos pueden ser reconocidos a !raves de la a1ineaci6n de las espinas margina1es aborales en la porci6n proximal: hacia el disco su desarrollo pleno es bloqueado por Ios rayos pre-existentes. Dibujos por Prof. Sanchez, preparados para publicaci6n por la cortesfa de Dr. Rich Mooi SEQUENCE OF RAYS IN Heliaster AND Labidiaster 575 3. In H. kubiniji, H. multirariatus and H. observations, but could not be proven with the canopus, three 'generations' of new rays growing samples then available, large as they were. I trust in four of the quadrants bring the total number of that statistics oflarge samples of small specimens, rays to 25, which is the 'normal' for these species. as now available, will enable a solution to the Yet further rays can grow and they normally question. This should also settle the question of appear according to the pattern of each of the differences in growth gradients in Heliaster species; that is, in the angle between the youngest species-groups. pre-existing rays and the originals (A,B,C .. ) in H. 5. Regeneration of rays is a frequent event in kubiniji and H. multiradiatus, whereas they appear Heliaster. It can involve larger or smaller between the two youngest rays of each quadrant fragments of isolated rays, or of two or three in H. canopus. More than three 'generations' of adjacent rays, or it can involve the whole length new rays are needed to complete the process in all -from their origin in the disc proper, on the aboral the other species, and they grow following the side- of a series of adjacent rays as shown in the pattern described for H. canopus. A fourth photograph enclosed (Fig. 2). This last feature is generation of 8 new rays brings the total number in the literature but it is only recently known that of rays to 33; a fifth generation, to 41. Yet these it is due to autotomy in Heliaster. Dr. Carlos 'final' numbers also require qualification.
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