A New Species of the Cave-Fish Genus Lucifuga (Ophidiiformes, Bythitidae), from Eastern Cuba

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A New Species of the Cave-Fish Genus Lucifuga (Ophidiiformes, Bythitidae), from Eastern Cuba A new species of the cave-fish genus Lucifuga (Ophidiiformes, Bythitidae), from eastern Cuba Hernandez, Damir; Moller, Peter Rask; Casane, Didier; Garcia-Machado, Erik Published in: ZooKeys DOI: 10.3897/zookeys.946.51373 Publication date: 2020 Document version Publisher's PDF, also known as Version of record Document license: CC BY Citation for published version (APA): Hernandez, D., Moller, P. R., Casane, D., & Garcia-Machado, E. (2020). A new species of the cave-fish genus Lucifuga (Ophidiiformes, Bythitidae), from eastern Cuba. ZooKeys, (946), 17-35. https://doi.org/10.3897/zookeys.946.51373 Download date: 26. sep.. 2021 ZooKeys 946: 17–35 (2020) A peer-reviewed open-access journal doi: 10.3897/zookeys.946.51373 RESEARCH ARTICLE https://zookeys.pensoft.net Launched to accelerate biodiversity research A new species of the cave-fish genus Lucifuga (Ophidiiformes, Bythitidae), from eastern Cuba Damir Hernández1, Peter Rask Møller2, Didier Casane3,4, Erik García-Machado1,5 1 Centro de Investigaciones Marinas, Universidad de La Habana, Calle 16, No. 114 entre 1ra y 3ra, Miramar, Playa, Ciudad Habana 11300, Cuba 2 Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark 3 Université Paris-Saclay, CNRS, IRD, UMR Évolution, Génomes, Comportement et Écologie, 91198, Gif-sur-Yvette, France 4 Université Paris Diderot, Sorbonne Paris Cité, 5 rue Thomas-Mann, 75205 Paris, France 5 Institut de Biologie Intégrative et des Sys- tèmes, Université Laval, Québec, QC, G1V 0A6, Canada Corresponding author: Peter Rask Møller ([email protected]) Academic editor: K. Piller | Received 22 February 2020 | Accepted 3 April 2020 | Published 6 July 2020 http://zoobank.org/6A134ED0-2FAC-483F-940B-6413D600FE55 Citation: Hernández D, Møller PR, Casane D, García-Machado E (2020) A new species of the cave-fish genusLucifuga (Ophidiiformes, Bythitidae), from eastern Cuba. ZooKeys 946: 17–35. https://doi.org/10.3897/zookeys.946.51373 Abstract Recently, a barcoding study and a molecular phylogenetic analysis of the Cuban species of the cave-fish genus Lucifuga Poey, 1858 revealed the existence of different evolutionary lineages that were previously unknown or passed unnoticed by morphological scrutiny (i.e., cryptic candidate species). In the present study, Lucifuga gibarensis is described as a new species restricted to anchialine caves in the northeastern karst region of the main island. The species was earlier described as a variety of Lucifuga dentata, but since the name was introduced as a variety after 1960, it is deemed to be infrasubspecific and unavailable ac- cording to the International Code of Zoological Nomenclature Art. 15.2. The new species differs from L. dentata by pigmented eyes vs. eyes absent and lack of palatine teeth vs. present. Lucifuga gibarensis seems to be most similar to the Bahamian species L. lucayana by showing pigmented eyes, 13 or 14 precaudal vertebrae and ten caudal fin rays. However, differs from it by a larger size of the pigmented eye (1.1–1.9 vs. 0.9–1.0% SL) and number of posterior lateral line neuromasts (30–33 vs. 34–35). Keywords Anchialine caves, Gibara, Holguin, speleology, taxonomy, viviparous brotulas Copyright Damir Hernández et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 18 Damir Hernández et al. / ZooKeys 946: 17–35 (2020) Introduction Lucifuga Poey, 1858 is a conspicuous genus of obligate cave-dwelling fishes, currently recognised with six species distributed in Cuba and Bahamas (Nielsen et al. 1999; Møller et al. 2006, 2016; see comparative material). Another nominal species, Lucifuga inopinata Cohen and McCosker, 1998, from off Galapagos Archipelago belongs to another, yet undescribed, genus (Møller unpublished data). Because of the characteristics of the habitats of Lucifuga species (caves, sinkholes and crevices) and the morphological modifications that they show in the evolutionary adaptations to the environment, the genus represents an iconic part of the fish fauna in Cuba. The scientific interest in these fishes, however, has been sporadic. Since the description of the genus and the two first Cuban species by Felipe Poey (1858), the studies dealing with the genus are very few and have mainly been dedicated to the discussions of morphological characters of taxonomic interest for the genus and spe- cies and the descriptions of new species (Gill 1863; Nalbant 1981; Díaz-Pérez et al. 1987a, 1987b; Díaz-Pérez 1988); some aspects of feeding and reproductive system (Lane 1903; Eigenmann 1909; Thinès and Piquemal 1978; García-Debrás and Pérez 1999) and two studies that constituted the first approximation to the evolutionary relationships of the group based on a comparison of several morphological characters of the three species known at that time (Vergara 1980, 1981). Møller et al. (2006) found evidence for all Cuban and all Bahamian species repre- senting two separate evolutionary lineages, but recently García-Machado et al. (2011) made a phylogenetic analysis of the Cuban species using mitochondrial and nuclear genes finding several new evolutionary lineages not identified previously by morpho- logical analyses. It was also indicated that the separation in Cuban and Bahamian species as suggested by Møller et al. (2006) is no longer correct, since some of the new Cuban species are more closely related to Bahamian species than to other Cuban species. Their results also questioned the specific status ofLucifuga teresinarum Diaz, 1988, showing no difference to L. subterranea Poey, 1858 (see also Lara et al. 2010). A controversial taxon has been Lucifuga dentatus var. holguinensis Díaz-Pérez, Ni- eto and Abio, 1987 from the Holguin province in eastern Cuba. It was suggested as a valid species name by Proudlove (2019), but the name has now been decided to be infrasubspecific and unavailable according to ICZN Art. 15.2, since it was introduced as a variety after 1960 (Fricke et al. 2019). In the present study, based on the molecular results of García-Machado et al. (2011) and from revisiting the morphological charac- ters recently used to define species in the genus (Møller et al. 2006), we present a new formal description of the species as Lucifuga gibarensis sp. nov. Materials and methods The morphological study of the Cuban Lucifuga species was based on the analysis of 214 individuals sampled from several localities covering most of its known distribu- New species of smiley-faced spider Spintharus 19 tion areas (Fig. 1). Nine morphometric measurements were taken using a Vernier cal- liper (precision 0.05 mm) and eleven meristic counts (e.g., fin ray numbers, scales, etc.) were carried out using a Novel stereomicroscope (magnification 40 x maximum) and/ or radiographs. All morphometric measurements were weighted according to the standard length (SL) to avoid allometric effects. The number of vertebrae was counted using X-ray radiographs. Abbreviations include: ANSP Academy of Natural Sciences of Drexel University, Philadelphia, Pennsylva- nia, U.S.A; FMNH Division of Fishes, Department of Zoology, Field Museum of Natural His- tory, Chicago, Illinois, U.S.A.; MCZ Museum of Comparative Zoology, Harvard University, Ichthyology De- partment, Cambridge, Massachusetts, U.S.A; MFP Felipe Poey Museum of Havana University, Cuba; UMMZ University of Michigan Museum of Zoology, Ann Arbor, Michigan, U.S.A.; ZMB Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiver- sitätsforschung, Berlin, Germany; ZMUC Natural History Museum of Denmark, University of Copenhagen, Denmark. Taxomomy Family Bythitidae Genus Lucifuga Poey, 1858 Type species. Lucifuga subterranea Poey, 1858 by subsequent designation of Jordan and Evermann, 1896, type locality: El Cajio cave, but not precisely stated for L. subter- ranea, which was referred originally from caves of San Antonio, middle-south Havana province, Cuba. Diagnosis. Body moderately elongated and compressed mainly from the abdomen to the caudal end. Snout with two nostrils: anterior nostril tube-shape and smaller, placed near to the upper lip; posterior nostril is a larger hole, placed ca. midway be- tween snout and eyes cavity. The mouth is subterminal with the lower jaw only slightly shorter than the upper. Opercular spines absent. Seven branchiostegal rays. The entire body is covered with small, rounded cycloid scales; fins naked except for scales on pectoral fin basis. Predorsal area and operculum scaled. Branchiostegal membranes, entire underside of the head, snout, interorbital areas and entire course of the cavernous cephalic system are naked. Origin of dorsal fin approximately above the tip of pectoral fins. Pelvic fin is subjugular with a single ray reaching ca. 1/3 to halfway to the anus. Pectoral fin behind the operculum, peduncle short and narrow. Lateral line 20 Damir Hernández et al. / ZooKeys 946: 17–35 (2020) with two series of sensory neuromasts: upper and anterior series extends from the head to a point ca. midway between dorsal and anal fin origins; and lower and posterior series extends from a point under and slightly in advance of the end of the upper series to the mid side from the caudal base. There are three symmetric sensory canal series on each side of the head: supraorbi- tal series with three pores (two anterior and one posterior): the anteriormost is at the snout rim, the second open between and above the nasal openings, and the posterior single pore is at the end of the lateral canal above the operculum. The infraorbital se- ries with six pores (three anterior and three posterior): first pore is slightly below the anterior nasal opening, the other five pores (two anterior and three posterior) are along the edge of infraorbital rim. Finally, the mandibular series with six pores (three anterior and three posterior). The first pore is in the fold of skin between the lip and canal se- ries, the second is at the side of the jaw tip on the lower lip, the third is at the anterior end of the mandibular series, the fourth to sixth posterior pores open ventrally along the mandibular series.
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