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The Red Devil-Midas-Arrow Cichlid Species Complex in Nicaragua

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The Red Devil-Midas-Arrow Cichlid Species Complex in Nicaragua University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Investigations of the Ichthyofauna of Nicaraguan Lakes Papers in the Biological Sciences 1976 The Red Devil-Midas-Arrow Cichlid Species Complex in Nicaragua George W. Barlow University of California - Berkeley John W. Munsey California State University Follow this and additional works at: https://digitalcommons.unl.edu/ichthynicar Part of the Aquaculture and Fisheries Commons Barlow, George W. and Munsey, John W., "The Red Devil-Midas-Arrow Cichlid Species Complex in Nicaragua" (1976). Investigations of the Ichthyofauna of Nicaraguan Lakes. 24. https://digitalcommons.unl.edu/ichthynicar/24 This Article is brought to you for free and open access by the Papers in the Biological Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Investigations of the Ichthyofauna of Nicaraguan Lakes by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Published in INVESTIGATIONS OF THE ICHTHYOFAUNA OF NICARAGUAN LAKES, ed. Thomas B. Thorson (University of Nebraska-Lincoln, 1976). Copyright © 1976 School of Life Sciences, University of Nebraska-Lincoln. The Red Devil-Midas-Arrow Cichlid Species Complex in Nicaragua GEORGE W. BARLOW AND JOHN W. MUNSEY INTRODUCTION lip to dorsal insertion of pectoral fin when fin held away from body. We became involved in the systematics of these fishes Width upper lip - Greatest width, measured at middle of through an interest in polymorphism in Nicaraguan cich­ upper lip. lids. It soon became evident, however, that there was a for­ Caudaljin length - Distance from posterior margin of midable problem in identifying the species. Populations in hypural plate to tip of longest central caudal-fin ray. different lakes of apparently the same species were recog­ Body depth - Perpendicular distance from origin of first nizably different. Some of those populations appeared dorsal-fin spine to ventral surface of body. highly variable while others were relatively uniform. Even Snout top - Angle formed by two lines, one following the occurrence of polychromatism varied radically from profile of snout, other running from tip of premaxilla to lake to lake (Barlow, 1976). Yet the number of names avail­ top of pectoral-fin insertion. able seemed greater than the number of species, as indi­ "Lip corrected" measurements - Some fish had enormously cated by Miller (1966: 792). fleshy lips. This created a problem in comparing popula­ Since no ichthyologist was able to undertake this problem tions. Yleasurements of fishes are conventionally converted when we started the research in 1966 we took it upon our­ to proportions of standard length (S.L.), which is the dis­ selves to clarify the situation. Specimens were collected tance from the middle posterior margin of the hypural from Lake Nicaragua and from four of the nearby crater plate to the anterior-most tip of the upper lip. If two fish lakes. We also preserved laboratory specimens to assess the are morphologically identical except that one has a large effect of environmental modification. protrusive upper lip, that fish will then have a greater S.L. We have resolved the status of the species and uncovered Consequently, all proportions calculated on that length will a new one. In assigning species to the synonymy of the two appear realtively smaller than those calculated for the fish principal species, we were aided by conversations with As­ with the normal lips. Thus instead of differing in one men­ torqui and later by correspondence with Villa. Once it was sural character, they will differ in all of them. determined that only two species were involved, and how to Our solution was to adjust the standard length of the separate them, the synonymy became apparent. thick lipped fish to that of a fish with thin lips. U sing as our We have also discovered some interesting evolutionary reference several normal (thin) lipped fish, we measured in problems. These include apparent introgressive hybridiza­ each the standard length, and the standard length minus tion in two lakes, evidence for character shift (Grant, 1972) the lip. The latter is the distance from the top of the involving two of the species, and a possible case of sympat­ hypural plate to the middle of the maxilla just behind the ric speciation. upper lip. We could then calculate the expected standard length for any fish of comparable size, irrespective of lip MATERIALS AND METHODS thickness, by measuring the distance to the maxilla. These We gathered data from 197 specimens of three species. "lip corrected" standard lengths facilitate the comparison of From the different populations we chose fish as close to the populations, revealing the fundamental differences in their same size as possible to minimize differences due to al­ morphological traits. For identification, nevertheless, it is lometric growth. Eighteen of the Cichlasoma citrinellum had useful to have measurements based on traditional S. L. ("lip been raised in the laboratory. All specimens are currently included"), so both are given in Table 1. housed in the Department of Zoology, University of California, Berkeley, except for the holotype arid paratypes Underwater observations were made in some of the of the new species (see below). Four other specimens of C. clearer crater lakes. These are reported elsewhere (Barlow, citrinellum (mislabelled C. labiatum) were deposited earlier in 1976) for C. citrinellum, but some other observations are the British Museum (Natural History); one was collected in presented here. Observations were also attempted in the Lake Masaya, Nicaragua, and is designated 1968: 1.12.1; Great Lakes and in Lake Masaya, but with no real success the other three are laboratory raised fish of Lake Masaya because of their great turbidity (Barlow, 1976). stock, designated 1968:1.12.2-4. Methods of counting and measuring follow those given by Hubbs and Lagler (1958), RESULTS except as follows: Face depth - Perpendicular line from dorsal surface to S)'stematics: ventral surface of head and tangent to anterior edge of Gunther (l864a,b, 1869) described four species from orbit. Nicaragua in this complex (see below), one being Heros cit­ Snout - Pl insertion - Distance from anterior-most tip of rinellus and the oth~r three H. labiatus and two synonyms of 359 BARLOW, MUNSEY it. In no case did Gunther have more than three specimens Cichlasoma labiatum in hand when he described a species. His decisions to rec­ 1859. Amphilophus froebelii Agassiz, Proc. Boston Soc. Nat. ognize new species appear to have been guided primarily.by Hist., 6: 408. Locale: Great Lakes of Nicaragua. the color of the specimens (yellow, orange, red, or greemsh 1864. Heros labiatus Gunther, Proc. ZooI. Soc. London, yellow), the size and shape of the lips, the length of the 1864: 27, PI. 4, Fig. 1. Locale: Lake Managua, eighth spine in the dorsal fin, and the relationship between Nicaragua. the length and depth of the free portion of the caudal fin. 1869. Heros lobochilus Gunther, Trans. ZooI. Soc. London, :\" one of these is a discriminating character when all popula­ 6: 457, PI. 75, Fig. 1. Locale: Lake Managua, tions are considered. In his description of H. lobochilus, Nicaragua. however, Gunther did recognize that the development of 1869. Heros ervthraeus Gunther, Trans. Zool. Soc. London, the lips may vary with age. 6: 457: PI. 75, Fig. 2. Locale: Lake Managua, ~1eek had more material at hand when he studIed these Nicaragua. fishes, and he had field experience in Nicaragua. His frame 1907. Cichlasoma dorsatum Meek, Field Columbo Mus., of mind, illustrated by the following lengthy quotation Zool. Ser., 7(4): 123. Type: Field Mus. Nat. Hist. about C. citrinellum, helps to set the stage for the rest of this 5971. Locale: Managua, Lake Managua, Nicaragua. article (Meek, 1907: 122-123). Nomenclature - Amphilophus froebelii Agassiz was inade­ "Of all the species (of) fishes in these lakes, this quately described and lacks a type specimen (as determined one is by far the most variable. I made many re­ by Karel F. Liem who diligently searched for it at Harvard). peated efforts to diyide this material ... in from two It also qualifies as a nomen oblitum under Article 23b of the to a half-dozen or more species, but in all cases I was International Code of Zoological Nomenclature since it has unable to find any tangible constant characters to remained unused as a senior synonym in the primary define them. To regard them as more than one zoological literature for more than a half century. It is true species meant only to limit the number by th~ mater­ that Jordan et al. (1930: 422) recognized the genus Am­ ial at hand, and so I have lumped them all m one. philophus Agassiz, indicating that A. froebelii is probably the "The fact that no red forms were found in Lake same species as Heros labiatus, of later date. However, th~y Tiscapa and Lagoon J enicero led me to believe that did not synonymize labiatus with froebelii because of theIr there was possibly one form or species in which rub­ uncertainty of the identity of Agassiz's species. They did not rism did not occur, but I found myself unable to realize that C. citrinellum from the Great Lakes does not discover any constant characters to separate it from develop fleshy lips. Amphilophus is a valid supraspecific the others, except on color alone. As to form, some name by monotypy. Since stability in zoological nom~~cla­ individuals are very deep, others quite elongate. On ture is desirable (Mayr et al., 1971), we regardA.froebelzz as a some with normal color there are well defined lateral nomen oblitum and also as a senior synonym of the currently bars but no trace of a lateral spot, on other speci­ recognized and long-used C. labiatum. mens of same size or larger, the lateral blotch is well Diagnosis - It can be distinguished from those C.
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