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The Neotropical Mailed Catfishes of the Genera Lamontichthys P. De

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The Neotropical Mailed Catfishes of the Genera Lamontichthys P. De The neotropical mailed catfishes of the genera Lamontichthys P. de Miranda Ribeiro, 1939 and Pterosturios ma n. gen., including the description of Lamontichthys stibaros n. sp. from Ecuador (Pisces, Siluriformes, Loricariidae) by I.J. H. Isbrücker & H. Nijssen Institute of Taxonomie Zoology, University of Amsterdam., The Netherlands than Abstract of the characters given are rather specific the Descriptions and illustrations are given of four species of generic." However, re-examination of holotype mailed catfishes to the Loricariinae, tribe belonging subfamily of the of the Parasturisoma A. type-species genus Harttiini. Two species are assigned to Lamontichthys P. de de Miranda Ribeiro de- Miranda Ribeiro, 1939: Lamontichthys filamentosus (La (1911: 109), originally 1935) of which the Monte, (type-species, Harttia filamentissima scribed as Loricaria brevirostris (in subgenus C. H. Eigenmann & Allen, 1942, is provisionally considered Rineloricaria Bleeker, 1862) by C. H. Eigenmann based of a junior synonym), on a total thirteen specimens, & R. S. demonstratedthat including all type-specimens, from Brazil, Bolivia, Peru, and Eigenmann (1889: 35), Ecuador from tributaries of the Rio Amazonas this is of the Sturi- (all system), species a representative genus and Lamontichthys stibaros n. sp., based on two specimens soma Swainson (1838: 337). from Ecuador, sympatric with the former species. Three species of the tribe Harttiini Boeseman Harttia microps C. H. Eigenmann & Allen, 1942, is redescribed from three out of the five type-specimens, (1971: 10, originally proposed as a subfamily, originating from Iquitos, Peru (Rio Amazonas system). It Harttiinae) share the peculiar shape of body, head, is designated as type-species of Pterosturisoma n. gen., which and caudal are somewhat inter- superficially resembles Lamontichthys. peduncle; they Sturisoma brevirostre (C. H. Eigenmann & R. S. Eigen- mediate between species of Sturisoma and of Hart- of Miranda mann, 1889), type-species Parasturisoma A. de tia Steindachner (1876b: 110-111). Two of these Ribeiro, 1911 ( = Sturisoma Swainson, 1838), which was are to Lamontich- poorly described previously, is redescribed from its unique species assigned Lamontichthys: holotype, primarily to indicate the generic distinction from thys filamentosus (La Monte, 1935), and Lamont- both Lamontichthys and Pterosturisoma, the species of which stibaros C. H. ichthys n. sp. Harttia filamentissima have been recently referred to Parasturisoma. Eigenmann & Allen (1942: 211) is included INTRODUCTION in the of provisionally synonymy Lamontichthys filamentosus. Lamontichthys differs from all other P. de Miranda Ribeiro (1939: 12) diagnosed the members of the Loricariinae "Forma subfamily Bonaparte, genus Lamontichthys as: menos deprimida in rather than six branched da dobro da 1831, having seven que Harttia; comprimento cabeça, o fin maior dentes pectoral rays. sua altura; setiformes; a segunda Pterosturisoma is here established for the re- série de ventral escamas, carenadas; superficie of Pterosturisoma de- de até à do ception microps (originally recoberta escamas espiculadas margem scribed as Harttia C. H. & inferior. Maior altura do sete vezes microps by Eigenmann beiço corpo, no 1942: the Dorsal im- Allen, 211-212). Superficially, body comprimento total (sem a caudal). and fin of Pterosturisoma is remi- ventral acûleo shape microps plantada à frente da com o prolon- niscent of Lamontichthys species, but the former gado em filamento, o mesmo acontecendo com os has the "normal" number of six branched pectoral peitorais e os caudais. Espécie-tipo: Lamontichthys fin rays. filamentosa (La Monte, 1935) n. comb." Subsequently, Lamontichthys was accepted by ABBREVIATIONS who all but one author, Boeseman (1971: 6), AMNH American Museum of Natural History, New York, stated: "In the original diagnosis I find no reasons N. Y. for this from Parasturisoma. Most separating genus BMNH British Museum (Natural History), London. Downloaded from Brill.com10/09/2021 02:59:30PM via free access - 58 I. J. H. ISBRUCKER & H. NIJSSEN LAMONTICHTHYS AND PTEROSTURISOMA rather CAS California Academy of Sciences, San Francisco, of this seven only genus subfamily having Calif. branched fin with than six pectoral rays. Together FMNH Field Museum of Natural History, Chicago, 111 Pterosturisoma it is intermediate in general body IU Indiana University, specimens in CAS Harttia. MCZ Museum of Comparative Zoology, Cambridge, Mass. and head shape between Sturisoma and National TJSNM former United States Museum, specimens Sturisoma Lamontichthys resembles the genus in National Museum of Natural History, Smith- more than Harttia, on account of the relatively sonian Institution, Washington D. C. ZMA Institute of Taxonomie Zoology (Zoölogisch Mu- deeper body and the larger fins. Like the other Amsterdam. seum), of has dorsal genera Harttiini, Lamontichthys 1,6 ZSM Zoologische Sammlung des Bayerischen Staates, fin last one to its base; 1,4 anal fin Munich. rays, split rays, last its fin si standard length. one split to base; 1,5 pelvic rays; 1,12,1 caudal fin rays. ACKNOWLEDGEMENTS Lateral line weakly developed. Dorsum of Dick Dr. W. N. Eschmeyer (CAS), Mrs. M. M. (MCZ), cleithrum broad. Further characters are described Dr. E. J. Fittkau (ZSM), Mrs. L. M. Hirsch (AMNH), for the two below. Dr. E. A. Lachner (USNM), Dr. G. J. Nelson (AMNH), species Mr. F. Scharl (ZSM), Miss P. Sonoda (CAS), and Dr. F. Terofal in loans (ZSM) were helpful providing (and a gift) Lamontichthys filamentosus (La Monte, 1935) of the in this We wish thank specimens recorded paper. to (Figs. 1-7, lOa-c, 14; tables Ia-b, Ila-h, Ilia) them for their assistance. der made the for Harttia La 4 Mr. L. A. van Laan (ZMA) photographs filamentosa Monte, 1935: 5-6, fig. (original this publication. description; type-locality: Brazil, Est. Amazonas, "Rio Jurua: Mr. for collected in the of the mouth of Rio Embira, a We are grateful to G. J. Howes (BMNH) his vicinity valuable while draft of this of Rio in is of suggestions reading a paper. tributary Tarauaca, which, turn, a tributary also Rio Jurua (70°15' W 7°30'S)"; listed on p. 7). METHODS Lamontichthys filamentosa; P. de Miranda Ribeiro, 1939: 12 of 108 (type-species new genus); Gosline, 1945: (listed; The methods of and meristic taking morphometric Rio Jurua). data are the same as those employed in our recent Lamontichthys filamentosus;r; Fowler, 1954: 90, fig. 690 (references; figure from Zizka, in La Monte; Alto Ama- studies on Loricariinae, see e.g. Isbriicker & Nijs- zonas); Ovchynnyk, 1968: 258 (listed; eastern Ecuador, sen We follow based (1978: 180-182). 0rvig (1977, upper Amazon basin; on personal communication with Isbrücker also 1967) in adopting the term "odontode" for G. Orcés); & Nijssen, 1976: 121-122 (discussion; Harttia filamentissima presumed to be conspecific). teeth-like structures occurring on dermal ossifica- Parasturisoma filamentosa; Boeseman, 1971: 6, 9, table 1 tions head and and fin covering body, on spines Harttia of (cited as filamentosa, type-species Lamontichthys, and considered a of Parasturisoma; rays. junior generic synonym morphometric data listed in table). Harttia filamentissima C. H. Eigenmann & Allen, 1942: 211, P. de Miranda Ribeiro, 1939 Lamontichthys pl. VIII figs. 1-2 (original description; type-locality: Peru, "Rio from also Huallaga"; paratype "Lago Cashiboya"; listed Lamontichthys P. de Miranda Ribeiro, 1939: 12 (original and Rio on p. 47 49); Fowler, 1945b: 109 (listed; Peru, diagnosis; type-species, by original designation and monotypy, Huallaga, Lago Cashiboya); Gosline, 1945: 108 (listed; Lamontichthys filamentosus (La Monte, 1935) = Harttia 88 Alto Huallaga e Ucayali); Fowler, 1954: (references; filamentosa La Monte, 1935). Amazonas, Peru); Tovar Serpa, 1967: 222 (listed; after Fowler, 1945b); Ovchynnyk, 1968: 258 (listed; Ecuador, Diagnosis. — Lamontichthys belongs to the tribe Chicherota near mouth of Rio Bobonaza, tributary of Rio Harttiini of the Loricariinae. It is the subfamily Pastaza, Prov. Napo-Pastaza; USNM 177215). Fig. 1. Lamontichthys filamentosus (La Monte, 1935), holotype in lateral view. Downloaded from Brill.com10/09/2021 02:59:30PM via free access 48 - 59 BIJDRAGEN TOT DE DIERKUNDE, (1) 1978 Fig. 2. Lamontichthys filamentosus (La Monte, 1935), paratype in dorsal view. table Ecuador: Parasturisoma filamentissima; Boeseman, 1971: 9, 1 (listed). USNM 167913 (two), si 71.7 and 167.3 mm, largest a male; USNM 177215 (one, recorded as Harttia filamentis- Specimens examined. — sima by Ovchynnyk, 1968), si 154 mm, Prov. Pastaza, Ri'o Bobonaza 02°25' S Amazonas system, Rio at Chicherota, Brazil : altitude 260-280 Rio 76°38'W, approximately m, upper AMNH AMNH 12616 (holotype), si 142 mm, 26941 Pastaza, coll. R. Olalla, 1-1954. Amazonas (paratype), si 161 mm, Est. Amazonas, Rio — the of Rio of Rio Description. system, near mouth Envira, a tributary and meristic data in tables Tarauacâ, which itself is a tributary of Rio Jurua, at Morphometric are given coll. A. 07°30' S 70°15'W, B. Krukoff, 1934. here. Ia-b, Ila-h, and Ilia and are not repeated General shape of body, head, and fins are illus- Bolivia: trated in figs. 1-7. of in ZMA ZSM 23876 (six, one which is deposited The following description of the various scutes 111.205), si 120.7 to 133.8 mm, all males, Prov. Cocha- is based the available coll. mainly on largest specimen bamba, Rio Amazonas system, R!o Chapare drainage, O. Schindler, XI-1953. (in USNM 167913), but it is representative of the other specimens since there
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