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Utrecht), the Artis Fund (Amster- Holotype from the Rio Ucayali, Peru, Collected Dam), and the Royal Academy of Sciences of the 1966 Bijdragen tot de Dierkunde, 56 (1): 39-46 1986 New records of the mailed catfish Planiloricaria cryptodon from the upper Amazon in Peru, Brazil and Bolivia, with a key to the genera of the Planiloricariina by H. I.J.H. Isbrücker & Nijssen Institute of Taxonomic Zoology, University of Amsterdam, P.O. Box 20125, 1000 HC Amsterdam, The Netherlands Abstract the variability of certain characters. Illustra- tions of a representative specimen are given. A The mailed catfish Planiloricaria cryptodon (Isbrücker, 1971) the the subtribe key to genera forming was hitherto only known from the holotype from Río Planiloricariina Martín Ucayali, Peru. New material from Rio Purus (Est. Acre, (sensu Salazar et al., and from Río Mamoré is de- Brazil) (Prov. Beni, Bolivia) 1982) is included. scribed and compared with the holotype. One of the new is illustrated. A the of the sub- specimens key to genera MATERIAL AND ABBREVIATIONS tribe Planiloricariina (tribe Loricariini of the subfamily is added. Loricariinae) Specimens are deposited in the collections ofthe Muséum National d'Histoire Naturelle, Paris (MNHN); Museu de Résumé Zoologia da Universidade de Sâo Paulo, Sâo Paulo (MZUSP); Zoologisches Forschungsinstitut und Museum Seulement l’holotype du Poisson-Chat cuirassé Planilo- Alexander Koenig, Bonn (ZFMK); and Zoòlogisch ricaria cryptodon (Isbrücker, 1971) était connu, en prove- Museum, Amsterdam (ZMA). Standard length is ab- Río nance du Ucayali, Pérou. Des exemplaires breviated as SL, head length as HL. supplémentaires sont maintenant décrits et comparés à l’holotype; ils proviennent du Rio Purus (Est. Acre, ACKNOWLEDGEMENTS Brésil) et du Rio Mamoré (Prov. Beni, Bolivie). Un des est illustré. On clé nouveaux exemplaires présente une We are grateful to Dr. H. A. Britski (MZUSP), who les de la sous-tribu Planiloricariina(tribu des pour genres loaned one and donated another specimen of Planiloricaria Loricariini de la sous-famille Loricariinae). cryptodon collected by Prof. Dr. P. E. Vanzolini in the Rio Purus. Likewise, Dr. L. Lauzanne and Dr. G. Loubens of the Convenio Piscicola, ORSTOM, Trinidad, Bolivia generously provided the specimens they collected in the INTRODUCTION Río Mamoré. Mr. L. A. der Laan of the van Zoòlogisch Museum, Amsterdam (ZMA) made the photographs. Financial visit Planiloricaria cryptodon (Isbrücker, 1971) was support for the to Brazil (January 1983) was given to the first author by the Treub Society for originally described, based upon the single Tropical Research (Utrecht), the Artis Fund (Amster- holotype from the Rio Ucayali, Peru, collected dam), and the Royal Academy of Sciences of the 1966. the Museu in During a visit to de Netherlands (Amsterdam). Zoologia da Universidade de Sâo Paulo the first author encountered two specimens from the Rio Purus, Brazil, collected in 1973. Quite PLANILORICARIINA received four additional recently, we specimens the Río obtained in The of this subtribe of tribe from Mamoré, Bolivia, type-genus the 1983. Loricariini established was originally as a Examination of this material revealed the subgenus of Pseudohemiodon Bleeker, 1862. It of various and ranked of the so-called variability morphometric was as a genus meristic characters of Planiloricaria. More abun- Pseudohemiodon Isbrücker & group by Nijssen material also from the which also included dant —particularly type- (1974 a & b), Hemiodont- in locality —is still necessary to obtain insight ichthys Bleeker, 1862, Reganella Eigenmann, 40 - I. J. H. ISBRUCKER & H. NIJSSEN PLANILORICARIA CRYPTODON and Rhadinoloricaria Isbrücker & Abdomen covered not into 1905, Nijssen, b) by scutelets, arranged a 1974a. single median strip 4 4a) Sides of head and snout more or less triangular in Isbrücker (1979a) established Planilori- dorsal view; cleithral width 0.8-1.1 in HL; cariina, Reganellina, and Hemiodontichthyina supracleithral width 1.3-1.7 in HL; head depth 2.5- as distinct, subtribes, monotypic, retaining 3.3 in HL; maxillary barbel 1.4-2.4 in HL; depth Pseudohemiodon and Rhadinoloricaria in the sub- caudal in peduncle 12.3-12.7 HL ... Pseudohemiodon tribe in which additional b) Sides of head tapering, of snout narrow and some- Loricariina, an genus, what concave in dorsal view; cleithral width 1.2 in Crossoloricaria, was erected. HL; supracleithral width 1.9 in HL; head depth 3.5 In 1981, Isbrücker informally subdivided the in HL; maxillary barbel 1.1 in HL; depth caudal Loricariina into two one genus groups, being peduncle 9.7 in HL Rhadinoloricaria the Pseudohemiodon group, now consisting of 5a) Upper lip with about 30 filaments; maxillary barbel Pseudohemiodon, Rhadinoloricaria, and Crosso- anteriorly covered with dermal ossifications bearing odontodes; lateral body scutes 31-33; maximum or- loricaria. bital diameter 5.6-6.4 in HL Dentectus Martin Salazar al. et (1982) established an b) Upper lip with about 4 filaments; maxillary barbel additional Dentectus, which genus, evidently without dermal ossifications; lateral body scutes 37- linked the with the maximum 12.2-14.5 in HL Pseudohemiodon-group genera 40; orbital diameter Planiloricariina. Planiloricaria Isbrücker estab- Finally, & Nijssen (1984) lished additional which an genus, Pyxiloricaria, Planiloricaria Isbrücker, 1971 was assigned to the Planiloricariina. Pseudohemiodon 1971: Of the six genera now included in this sub- (Planiloricaria) Isbrücker, 276-278 (original diagnosis; type-species, by original designa- tribe, four are monotypic, viz., Planiloricaria, tion Pseudohemiodon and monotypy, (Planiloricaria) cryp- Rhadinoloricaria, Dentectus, and Pyxiloricaria. todon Isbrücker, 1971). Pseudohemiodon contains seven described species Planiloricaria;Isbriicker & Nijssen, 1974a: 74-76 (elevation new remain be (several species to described), to generic rank). whereas four of species Crossoloricaria are known & (Isbrücker Nijssen, 1983). Planiloricaria can be easily distinguished from the other of the subtrihe Planiloricariina genera Distinctions. — The Planiloricariina can be by the characters indicated in the above key. distinguished at once from the subtribe Loricariina Martín Salazar et al., 1982; = (cf. Nowadays, the genus is represented in museum Loricaria- of 1981: collections group Isbrücker, 56) particu- by seven specimens from three areas the teeth. The larly by reduced, inconspicuous (fig. 4), all tributaries to the Amazon River, six be from genera may distinguished one an- viz., Rio Ucayali (Dept. Ucayali, Peru), Rio other the characters indicated in the by key, as Purus (Est. Acre, Brazil), and Río Mamoré follows: (Prov. Beni, Bolivia). Several (often slight) differences exist be- KEY TO THE PLANILORICARIINA tween the Peruvian, Brazilian, and Bolivian Teeth visible in both and lower 2 la) upper jaws specimens available. However, the samples are Teeth visible in of b) not upper jaws normally preserved small too to permit an explanation of the dif- specimens 5 ferences. Hence, the six specimens foundsubse- 2a) Lateral body scutes 31-34; no fleshy flap on bran- to the of the of P. chiostegal membrane 3 quent description holotype Lateral are identified with that b) body scutes 29-30; a large, transverse, fleshy cryptodon species, wrinkled flap originates from anterior margin of awaiting the collection of more abundant branchiostegal membrane Pyxiloricaria material. While preparing the description, the 3a) Abdomen naked except for a single median strip of Rio used larger specimen from Purus was first, small, roundish scutelets (holotype of C. rhami, how- and the differences with the remaining material ever, has the abdomen completely covered) Crossoloricaria are given. BIJDRAGEN TOT DE DIERKUNDE, 56 (1) - 1986 41 In addition to the references to P. cryptodon ferences obtained while taking measurements the Planiloricaria and the methods described given below, genus was com- counts according to mentioned pared or by Isbriicker & Nijssen by Isbriicker & Nijssen (1978: 180-182). (1974b: 196; 1976: 118, table 4; 1978: 179; Predorsal area slightly shorter in the holotype 1979: 192; and 1984: 163) and by Isbriicker et than in the other specimens (3.5 in SL against al. (1983: 41, table II). All these references 3.2-3.4); filamentous dorsal fin spine much SL 2.7-2.9 were based upon the hitherto only known longer in the holotype (2.4 in against in dorsal specimen, holotype of the species. specimens with a complete filament); shorter in the thoracic area slightly holotype (1.3 in HL against 1.1-1.2); abdominal area Planiloricaria cryptodon (Isbrücker, 1971) slightly shorter in the Rio Purus specimens table HL (Figs. 1-4; I) (1.7-1.9 in against 1.5-1.6); maximum or- bital diameter smaller in the Río Mamoré Pseudohemiodon (Planiloricaria) cryptodon Isbrücker, 1971: specimens in HL against 12.2-13.4); 278-281, figs. 2b-c, 3-8 (original description; type- (13.8-14.5 "Peru: Rio caudal in the Rio locality: Ucayali nearPucallpa"; holotype, peduncle more depressed 1972: 175 "ZFMK/I/66/1717"); Isbrücker, (com- Mamoré specimens (14.3-16.4 in HL against 1973: 188 186 listed parison); Isbrücker, (listed; on p. 12.6-14.0); the holotype and the Rio Purus Pseudohemiodon 1984: 219 as cryptodon); Busse, (holotype specimens have slightly more lateral body ZFMK listed; reg. no. 1865). scutes the Río Mamoré Planiloricaria cryptodon; Isbrücker & Nijssen, 1974a: 68, 78, (39-40 against 37-38); figs. 3, 4c-d, table I (data and figures of holotype); specimens tend to have slightly fewer coalescing Isbrücker, 1975: 90 Isbrücker, 1979a: 87 (comparison); scutes (18 in 3 specimens, 19-20 in the fourth (listed); Isbrücker, 1979b: 111, fig. 4 (holotype); specimen, against 19-21 in the holotype plus the Isbrücker, 1980: 122-123 (listed); Rapp Py-Daniel, Rio Purus specimens). 1981: 14 (comparison); Isbrücker, 1981: 55 (com- Fin counts: dorsal fin anal fin parison); Martin Salazar et al., 1982: 130 (com- ray I,6,i; I,4,i; parison). pectoral fin 1,6; pelvic fin 1,5; caudal fin 1,10,1, in the seven at hand. Material examined. — specimens PERU: ZFMK 1865 (previously ZFMK/I/66/1717), holo- Number of subbarbels along maxillary type, Dept. Ucayali, Rio Ucayali near Pucallpa with total of barbel: holotype a (left/right) 18/20 (08°21'S 74°33'W), coll.
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