Validity of <Emphasis Type="Italic">Abudefduf caudobimaculatus</Emphasis> Okada and Ikeda 1939 and synonymies of <Emphasis Type="Italic">Abudefduf vaigiensis</Emphasis> (Quoy and Gaimard 1825) (Perciformes: Pomacentridae)

Abudefduf caudobimaculatus Okada and Ikeda 1939, having long been regarded as a junior synonym of Abudefduf vaigiensis (Quoy and Gaimard 1825), is herein redescribed as a valid species on the basis of the holotype and 77 additional specimens. Abudefduf caudobimaculatus can be distinguished from A. vaigiensis in having 11–13 (modally 12) dorsal-fin soft rays, 4 scale rows above the lateral line, 2½ scale rows between the middle of the spinous portion of the dorsal-fin base and lateral line, 3–4 (4) scale rows on the cheek, scales always present on the anteroventral region of the head, eleventh and last dorsal-fin spines and pectoral-fin length 15.5–18.4%, 17.1–20.6%, and 33.5–39.9% of SL, respectively, two black spots on the caudal-fin base, anteriormost bar descending to behind the pectoral-fin base, 0–1 tubed lateral-line scales on the fourth vertical bar, and third to seventh (usually fifth or sixth) dorsal-fin soft ray base at the anterior margin of the fourth vertical bar. Synonymies of A. vaigiensis are discussed with designations of lectotypes for Glyphisodon vaigiensis and Glyphisodon rahti.     

Review of Indo-Pacific dwarf lionfishes (Scorpaenidae: Pteroinae) in the <Emphasis Type="Italic">Dendrochirus brachypterus</Emphasis> complex,with description of a new species from the western Indian Ocean

A taxonomic review of the Dendrochirus brachypterus complex resulted in the recognition of five species, including Dendrochirus barberi (Steindachner 1900), Dendrochirus bellus (Jordan and Hubbs 1925), Dendrochirus brachypterus (Cuvier in Cuvier and Valenciennes 1829), Dendrochirus hemprichi sp. nov. and Dendrochirus tuamotuensis Matsunuma and Motomura 2013. The complex is defined as having usually 9 dorsal-fin soft rays, usually 5 anal-fin soft rays, 17–20 (rarely 20) pectoral-fin rays, no ocellated spots on the soft-rayed portion of the dorsal fin and usually 2 (sometimes none) barbels on the snout tip. Dendrochirus barberi, known from the Hawaiian Islands and Johnston Atoll, is characterized by usually 18 pectoral-fin rays, a relatively high number of scale rows in the longitudinal series (modally 51 vs. 39–49 in other species) and mottled markings on the pectoral fin in large specimens. Dendrochirus bellus, restricted to the northwestern Pacific Ocean from the South China Sea north to southern Japan, is characterized by usually 17 pectoral-fin rays, a relatively low number of scale rows in the longitudinal series (modally 38 vs. 44–51 in other species), and the absence of skin flaps on the orbit surface and uppermost preopercular spine base. Dendrochirus tuamotuensis, recorded only from the Tuamotu Archipelago, is characterized by 19 pectoral-fin rays, the posterior margin of the pectoral fin strongly notched, and a relatively shallow and narrow head and body. Dendrochirus hemprichi sp. nov. is distributed in the western Indian Ocean, including the Red Sea. Although previously confused with a closely related congener (D. brachypterus, known from the northern and eastern Indian Ocean and western Pacific), D. hemprichi can be distinguished from the former by having fewer scale rows between the last dorsal-fin spine base and lateral line, and between the sixth dorsal-fin spine base and lateral line [4–7 (5) in D. hemprichi vs. 5–7 (6) in D. brachypterus, in both cases], a slightly greater interorbital width at the mid-orbit [5.5–10.7 (mean 7.8) % SL vs. 4.5–8.9 (6.8) % of SL] and at preocular spine base [4.4–9.1 (6.6) % SL vs. 3.5–7.8 (5.7) % of SL], and slightly shorter posteriormost (usually 13th) dorsal-fin spine length [11.8–19.9 (15.3) % SL vs. 13.3–21.3 (17.2) % of SL]. Moreover, D. hemprichi tends to have relatively more spinous points on the head spines and ridges, compared with D. brachypterus. Notwithstanding the morphological similarity between the two species, an obvious genetic difference was observed between D. hemprichi and D. brachypterus. Dendrochirus chloreus Jenkins 1903 and Dendrochirus hudsoni Jordan and Evermann 1903 were synonymized under Pterois barberi, as in some previous studies. Scorpaena koenigii Bloch 1789 was regarded as conspecific with D. brachypterus, which it predated. However, the former name should be suppressed under Reversal of Precedence.     

Review of the <Emphasis Type="Italic">Ostichthys japonicus</Emphasis> complex (Beryciformes: Holocentridae: Myripristinae) in the northwestern Pacific Ocean,with description of a new species

A taxonomic review of the northwestern Pacific Ocean members of the Ostichthys japonicus complex (Holocentridae: Myripristinae), defined by 3.5 scale rows between the lateral line and spinous dorsal-fin base, recognized three valid species: Ostichthys alamai sp. nov., Ostichthys hypsipterygion Randall, Shimizu and Yamakawa 1982 and Ostichthys japonicus (Cuvier in Cuvier and Valenciennes 1829). Ostichthys alamai, based on 10 specimens (118–179 mm SL) from Panay Island, the Philippines and Sulawesi, Indonesia, is similar to O. hypsipterygion in having longitudinal rows of white spots laterally on the body, but has 17 or 18 (modally 17) pectoral-fin rays [vs. 15 or 16 (15) in the latter], the last dorsal-fin spine fused to the first dorsal-fin soft ray (vs. spine and ray separated), and no white blotch on the pectoral-fin base (vs. white blotch present). It differs from O. japonicus, also occurring in the Philippines, in having relatively longer dorsal- and anal-fin spines, a greater number of well-developed long spinules on the body scales, and rows of white spots laterally on the body (vs. generally absent). Detailed comparisons of O. alamai with other members of the complex are made, and revised diagnoses given for O. hypsipterygion and O. japonicus. Ostichthys sheni Chen, Shao and Mok 1990 and Holotrachys major Whitley 1950 are both regarded as junior synonyms of O. japonicus.     

Three new species of the genus <Emphasis Type="Italic">Acropoma</Emphasis> (Perciformes: Acropomatidae) from the Indian Ocean

Three new species of Acropoma are described from the Indian Ocean. These species have been identified as “A. japonicum Günther 1859” by many authors, but clearly differ from A. japonicum in the shape and length of the luminous gland, counts of pectoral-fin rays and scales between first dorsal-fin base and lateral line, and other diagnostic characters. Acropoma heemstrai sp. nov. is described on the basis of 17 specimens (53.1–121.0 mm standard length: SL) collected from South Africa and Mozambique. It is distinguished from other congeners by its unique moderate Y-shaped luminous gland, extending from the throat to midway between the origins of the pelvic and anal fins, (luminous gland length 23.1–27.0% SL) and a pointed protrusion on the symphysis of lower jaw. Acropoma lacrima sp. nov. is described on the basis of 6 specimens (64.1–77.9 mm SL) collected from the Arabian Sea. Also, this species has been previously reported as “A. argentistigma Okamoto and Ida 2002” from the Bay of Bengal. It is characterized by having a vertical line on the cheek, short U-shaped luminous gland (luminous gland length 15.0–16.0% SL), and weakly ctenoid and cycloid scales on the side of the body. Acropoma neglectum sp. nov. is described on the basis of 5 specimens (105.3–168.5 mm standard length: SL) collected from the Gulf of Aqaba, northern Red Sea. It is similar to A. japonicum in having a short U-shaped luminous gland, but differs in having a shorter luminous gland (12.0–13.4% SL vs. 17.0–20.8% SL in A. japonicum), 3 scales between first dorsal-fin base and lateral line (vs. 4 scales in A. japonicum), and 16–17 pectoral-fin rays [vs. 14–16 (modally 15) in A. japonicum].     

Redescription of <Emphasis Type="Italic">Lagocephalus cheesemanii</Emphasis> (Clarke 1897), a senior synonym of <Emphasis Type="Italic">Lagocephalus gloveri</Emphasis> Abe and Tabeta 1983, based on morphological and genetic comparisons (Actinopterygii: Tetraodontiformes: Tetraodontidae)

Lagocephalus gloveri Abe and Tabeta 1983 is shown to be a junior synonym of Tetrodon cheesemanii Clarke 1897 based on examination of morphological characters and DNA analysis of specimens collected from the western North Pacific, Australia and New Zealand. Lagocephalus cheesemanii is distinguished from other species of Lagocephalus by the following combination of characters: spinules on the back in a rhomboidal patch extending from the region between the nasal organ to the posterior part of the pectoral fin; caudal fin double emarginate with middle rays posteriorly produced; dorsal-fin rays 11–15; anal-fin rays 11–14; pectoral-fin rays 15–18; vertebrae 8+11=19; dorsal half of the body dark brown to brownish black; caudal fin dark brown to black with dorsal and ventral white tips. A neotype of L. cheesemanii is designated.     

<Emphasis Type="Italic">Sebastiscus vibrantus</Emphasis>, a new species of rockfish (Sebastidae) from Indonesia and Taiwan

A new species of rockfish, Sebastiscus vibrantus, is described on the basis of 24 specimens collected from Bali, Indonesia and Taiwan. Although closely resembling Sebastiscus tertius (Barsukov and Chen 1978) in overall body appearance, and having usually 19 pectoral-fin rays and black margined white blotches scattered on the lateral body surface, the new species has thicker unbranched pectoral-fin rays, a greater pectoral-fin base length, the third dorsal-fin soft ray usually longest, the anterior margin of the scaled suborbital area not reaching level the anterior margin of the orbit, and weakly developed nuchal spines.     

Redescriptions of two western Pacific triplefins (Perciformes: Tripterygiidae), <Emphasis Type="Italic">Enneapterygius fuscoventer</Emphasis> and <Emphasis Type="Italic">E. howensis</Emphasis>

Two western Pacific triplefins, Enneapterygius fuscoventer Fricke 1997 and E. howensis Fricke 1997 (Perciformes: Tripterygiidae), are similar to each other in sharing 15–19 (usually 17) notched lateral-line scales and the mandibular pore formula 3–5 + 1 + 3–5 (usually 4 + 1 + 4), in addition to similar coloration, viz. body with four vertical bands, the first and second forked ventrally, dorsal-fin membrane semi-transparent, anal fin entirely blackish, and caudal fin blackish with a semi-transparent margin. These species have previously been known only from preserved specimens. Examination of additional specimens plus color photographs of males and females of both species when fresh, and comparisons with type specimens resulted in several features, including coloration and counts of second dorsal-fin spines, anal-fin soft rays, pored lateral-line scales and longitudinal scale rows, being regarded as new diagnostic characters. Enneapterygius fuscoventer and E. howensis have been newly recorded from southern Japan and coastal eastern Australia, respectively.     

A new species of <Emphasis Type="Italic">Pempheris</Emphasis> (Perciformes: Pempheridae) endemic to the Ogasawara Islands,Japan

Pempheris familia sp. nov. is described on the basis of two specimens collected from the Ogasawara Islands, Japan. The new species is most similar to Pempheris japonica Döderlein in Steindachner and Döderlein 1883, endemic to Japanese and Korean waters, in having adherent scales with strong ctenii on the lateral and ventral surfaces of the body, each scale expanded basally and distally due to central narrowing, the abdomen with a U-shaped cross-sectional outline, a large ventral fenestra between the coracoid and cleithrum, 10 dorsal-fin soft rays and 35 or 36 anal-fin soft rays. However, Pempheris familia can be distinguished from P. japonica by the following combination of characters: 84–88 pored lateral-line scales; 14 or 15 scale rows above the lateral line; 50–55 predorsal scales; 26 circumpeduncular scales; and a distinct blackish blotch on the pectoral-fin base. Pempheris familia appears to be endemic to the Ogasawara Islands.     

Review of the <Emphasis Type="Italic">Chromis xanthura</Emphasis> species group (Perciformes: Pomacentridae), with description of a new species

A taxonomic review of the Chromis xanthura species group, defined here as having 13 dorsal-fin spines, three upper and three lower procurrent caudal-fin rays, two black bands at the preopercular and opercular margins, and a yellow caudal fin when juvenile, resulted in the recognition of three species, Chromis xanthura (Bleeker 1854), Chromis opercularis (Günther 1867), and Chromis anadema sp. nov. Chromis xanthura and C. opercularis, the Pacific and Indian Ocean paired sister species, respectively, are redescribed, with confirmation of two color types of C. xanthura (having a white or black caudal peduncle and fin) as a single species on the basis of morphological and molecular analyses. Chromis anadema sp. nov., described from the oceanic islands of the Pacific Ocean on the basis of 21 specimens, is characterized by having 28–33 gill rakers; longest dorsal-fin soft ray length 20.0–24.7% of standard length (SL); first anal-fin spine length 5.0–6.1% of SL; caudal-fin length 33.4–43.8% of SL; posterior tips of caudal-fin lobes not filamentous in adults; broad black bands along preopercular and opercular margins, sum width of two bands 28.9–38.7% of head length; distal half of soft-rayed portion of dorsal fin transparent in adults; triangular black blotches at upper and lower caudal-fin base in adults; caudal peduncle and fin bluish black in adults; and body grayish, and all fins (except for pectoral fin) bright yellow in juveniles.     

<Emphasis Type="Italic">Stolephorus continentalis,</Emphasis> a new anchovy from the northwestern South China Sea,and redescription of <Emphasis Type="Italic">Stolephorus chinensis</Emphasis> (Günther 1880) (Clupeiformes: Engraulidae)

Stolephorus continentalis sp. nov. is described from 36 specimens from Hong Kong and northern Vietnam. The new species is closely related to the endemic Chinese anchovy S. chinensis (Günther 1880), which is redescribed with a lectotype designated, with both species having a long upper jaw with the posterior tip just reaching to the posterior border of the preopercle; no predorsal scute; the posterior preopercular border rounded, convex; the posterior tip of the depressed pelvic fin not reaching to vertical through dorsal-fin origin; a pair of dark patches behind the occiput without a following pair of dark lines; and no black spots below the eye and lower-jaw tip. However, the new species is distinguished from S. chinensis in having higher total gill-raker counts on the first, second, third, and fourth gill arches (43–48, 33–40, 23–26, and 18–21, respectively vs. 35–41, 29–34, 19–24, and 16–19), and longer pectoral (16.5–19.2 % SL vs. 15.8–16.4 %) and pelvic fins (9.1–11.6 % SL vs. 8.2–8.3 %). Examination of the specimens previously considered as S. chinensis from Southeast Asia revealed that they differed from true S. chinensis and S. continentalis in having eight transverse scales (vs. 10 in the latter two species). The applicable scientific name for the Southeast Asian species is suggested here as Stolephorus oceanicus Hardenberg 1933.     

First record of <Emphasis Type="Italic">Pojetaia runnegari</Emphasis> Jell, 1980 and <Emphasis Type="Italic">Fordilla</Emphasis> Barrande, 1881 from the Middle East (Taurus Mountains,Turkey) and critical review of Cambrian bivalves

Cambrian bivalves from the Middle East are reported here for the first time. They come from early “Middle Cambrian” and latest “Early Cambrian” limestones of the lower Çal Tepe Formation at the type locality (near Seydi?ehir, western Taurides). The majority of the new findings consists of Pojetaia runnegari Jell, 1980, but a few specimens of Fordilla sp. represent the first report of this genus from “Middle Cambrian” strata. Based on a compilation of the hitherto reported, but mostly revised Cambrian bivalves, the today widely accepted taxa are discussed. The genera Pojetaia Jell, 1980 and Fordilla Barrande, 1881 are critically evaluated, and three valid species are included in Pojetaia: P. runnegari Jell, 1980, P. sarhroensis Geyer and Streng, 1998, and—with limitations—P. ostseensis Hinz-Schallreuter, 1995. Fordilla also includes three species: F. troyensis Barrande, 1881, F. sibirica Krasilova, 1977, and F. germanica Elicki, 1994. The Cambrian genera Tuarangia MacKinnon, 1982, Camya Hinz-Schallreuter, 1995, and Arhouriella Geyer and Streng, 1998 most probably belong to the class Bivalvia. Palaeoecologically, the Cambrian bivalves of the Western Perigondwanan shelf seem to occur in a relatively small window of low-energy, subtidal, open-marine, warm-water conditions on a muddy carbonate ramp or platform with reduced sedimentation rate. The frequently interpreted infaunal mode of life of Pojetaia and Fordilla is questioned by observations of similarly organized modern bivalves. The palaeogeographical distribution of Pojetaia and Fordilla is discussed with respect to their early ontogeny and to differences in the recent state of knowledge on shelly fossils from Cambrian carbonate successions of Perigondwana.     

Review of the clingfish genus <Emphasis Type="Italic">Kopua</Emphasis> (Gobiesocidae: Trachelochisminae) in Japan,with description of a new species

A taxonomic review of the clingfish genus Kopua (Gobiesocidae: Trachelochisminae) in Japan recognizes three species: K. japonica Moore, Hutchins and Okamoto 2012, K. vermiculata Shinohara and Katayama 2015 and K. yoko sp. nov. Kopua japonica and K. vermiculata are redescribed with revised diagnoses on the basis of 20 specimens (10.4–30.4 mm standard length; SL) and the holotype, respectively. Kopua japonica is similar to K. vermiculata in head sensory pore characters (normally single nasal and postocular canal pores). However, the former differs distinctly from the latter as follows: 6–8 (modally 7) gill rakers (vs. 4 or 6); 31–33 (33) vertebrae (vs. 35); anus slightly closer to posterior margin of disc than to anal-fin origin (vs. much closer to posterior margin of disc); snout length 5.3–8.7 (mean 7.0) % SL (vs. 9.2 % SL); disc length 21.2–24.0 (22.8) % SL (vs. 18.8 % SL); pre-dorsal- and anal-fin lengths 72.9–78.4 (75.2) and 78.1–82.8 (80.1) % SL, respectively (vs. 67.5 and 73.6 % SL); and two stripes on cheek (vs. a triangular blotch). Kopua yoko sp. nov., based on 14 specimens (17.7–28.8 mm SL) from the Pacific coast of southern Japan, Sea of Japan and the East China Sea, is characterized by the following combination of characters: 6 or 7 (modally 6) dorsal-fin rays; 4–6 (5) anal-fin rays; 21 or 22 (21) pectoral-fin rays; 4–6 (5 or 6) gill rakers; 31–33 (31) vertebrae; a single (rarely two) nasal canal pores; two lacrimal and preopercular canal pores; snout length 6.5–7.9 (mean 7.1) % SL; gill opening depth 5.8–7.1 (6.5) % SL; least interorbital width 2.0–3.7 (2.6) % SL; disc length 20.3–25.0 (23.1) % SL, disc region D without flattened papillae; caudal-peduncle depth 8.1–10.2 (9.2) % SL; anus slightly closer to posterior margin of disc than to anal-fin origin; pre-dorsal- and anal-fin lengths 71.6–77.1 (73.9) and 77.0–83.7 (80.4) % SL, respectively; post-dorsal-caudal length 12.6–15.0 (13.8) % SL; arch-shaped blotches on lateral aspect of body; and two reddish-orange stripes on cheek. Morphological changes with growth in K. japonica and K. yoko sp. nov. are also described.     

A new deepwater assfish, <Emphasis Type="Italic">Bassozetus</Emphasis><Emphasis Type="Italic">mozambiquensis</Emphasis> sp. nov. (Ophidiiformes: Ophidiidae), from the western Indian Ocean

A new deepwater assfish, Bassozetus mozambiquensis sp. nov., is described from a single specimen (431 mm SL) collected from the western Indian Ocean. Originally identified as Bassozetus compressus (Günther 1878), it was subsequently found to be distinguishable from 12 valid species of the genus due to the following combination of characters: dorsal-fin rays 117; long rakers on first gill arch 14; oblique scales ca. 30; total vertebrae 65; pelvic-fin length 9.5 % of standard length; a single median basibranchial tooth patch; sagittal otolith lacking a small process on anterior margin, dorsal margin smooth, an ostial channel present.     

First-principle investigation on growth patterns and properties of cobalt-doped lithium nanoclusters

A systematic theoretical investigation on cobalt lithium clusters Li_nCo [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] was performed with a DFT approach. The location of global minima and structural evolution were carried out using the partical swarm optimization method. Li₆Co is the transition structure in going from low-coordinated structures to three-dimensional torispherical structures with a cobalt atom enclosed by lithium atoms. Maxima of ?₂ E and E _b for Li_nCo were found at n?=?3, 6, 8, 10, indicating that these clusters possess higher relative stability than their neighbors. In comparison with small clusters, n?=?1–6, the greater electron transfer from Li-2s to Co-3d within cage-like clusters Li_nCo (n?=?7–12) strengthens the bonding effect between Li_n and Co, which is reflected in the Wiberg bond index of Co and atomic binding energy analysis. AdNDP analysis verified the presence of both Lewis bonding elements (1c–2e objects) and delocalized bonding elements (6c–2e, 9c–2e and 10c–2e bonds). It is hoped that this theoretical work will provide favorable information to help understand the influence of dopant transition metal atoms on the properties of lithium-based materials.     

Aspect and modality in the interpretation of deverbal -<Emphasis Type="Italic">er</Emphasis> nominals in English

This article presents a corpus study of over 16,000 tokens of -er nominalizations on 62 verbal bases that were extracted from the Corpus of Contemporary American English and the British National Corpus. We show that an individual -er nominal can often be given a range of modal and aspectual readings and that a number of factors influence the availability of different readings for -er nominals, including verb type, syntactic context (verb tenses, adverbs), and encyclopedic information. On the basis of these data, we argue, contra Cohen (2016), that the core meaning of the affix -er (as in writer, printer, etc.) cannot be that of a dynamic modal. We show that neither Cohen’s (2016) analysis nor syntactic analyses such as that of Alexiadou and Schäfer (2010) can account for the range of readings we find. We conclude by sketching one possible analysis in terms of the Lexical Semantic Framework of Lieber (2004, 2016) that postulates underspecified lexical representations of the -er nominals and resolution of underspecification in context.     

Spinicaudata (“Conchostraca,” Crustacea) from the Middle Keuper (Upper Triassic) of the southern Germanic Basin,with a review of Carnian–Norian taxa and suggested biozones

The Coburg Sandstone member of the Hassberge Formation, Middle Keuper, Carnian, Upper Triassic, in the Germanic Basin of Central Europe contains spinicaudatan branchiopods which considerably broaden the known spectrum and provide important data on the phylogenetic history and intercontinental correlation of this systematic group. The spinicaudatan fauna for this lithostratigraphic unit is described in detail and includes Euestheria kozuri sp. nov., E.? sp. nov. A, Gregoriusella striatula sp. nov., Laxitextella freybergi Kelber and Kozur in Kozur and Weems, 2007, L. dorsorecta (Reible, 1962), and Laxitextella? sp. A. Additional discussions deal with Euestheria multicostata (Geyer, 1987), E. winterpockensis (Bock, 1953a), Laxitextella laxitexta (Sandberger in Jones, 1890), Laxitextella multireticulata (Reible, 1962), and “Laxitextella? hausmanni (Schmidt, 1938),” as well as problems with (sub)global zonations that are based on spinicaudatans and suggested to be of Carnian and Norian age.     

<Emphasis Type="Italic">Anonchotaenia adhiraji</Emphasis> sp.n. (Platyhelminthes:Cestoidea) from a Bird <Emphasis Type="Italic">Hypsipetes madagascarensis</Emphasis> from Arunachal Pradesh,India

The genus Anonchotaenia Cohn, 1900 contains 23 valid species. In this paper Anonchotaenia adhiraji sp.n. obtained from the intestine of a bird Hypsipetes madagascarensis commonly known as black bulbul from Bomdila in Dirang district of Arunachal Pradesh, India is described and illustrated.The species is characterized by a large unarmed, square-shaped scolex; testes 7–8 in number arranged in two lateral groups and a voluminous paruterine organ that differentiates it from the rest of the described species in the genus. This is also the first report of the genus Anonchotaenia Cohn, 1900 from Arunachal Pradesh, India.     

Neotropical Monogenoidea. 55. Dactylogyrids parasitising the pintado-amarelo <Emphasis Type="Italic">Pimelodus maculatus</Emphasis> Lacépède (Actinopterygii: Pimelodidae) from the Rio São Francisco,Brazil

Eight species of Dactylogyridae were collected from the gills of the pintado-amarelo Pimelodus maculatus Lacépède in the Rio São Francisco in Brazil: Ameloblastella paranaensis (França, Isaac, Pavanelli &; Takemoto, 2003) Mendoza-Franco &; Scholz, 2009, A. satoi n. sp., Ameloblastella sp., Demidospermus armostus Kritsky &; Gutiérrez, 1998, D. cf. bidiverticulatum (Suriano &; Incorvaia, 1995) Kritsky &; Gutiérrez, 1998, D. ichthyocercus n. sp., D. paravalenciennesi Gutiérrez &; Suriano, 1992 and D. uncusvalidus Gutiérrez &; Suriano, 1992. Two new species, A. satoi n. sp. and D. ichthyocercus n. sp., are described, and A. paranaensis is redescribed. The Rio São Francisco represents new geographical records for the five previously described dactylogyrid species.