212 research outputs found
Métricas de autor Oscar Fernando Acevedo Arango
No full textInforme de las métricas de autor del Dr. Oscar Fernando Acevedo Arango de las publicaciones indexadas en Google Académico cuyo objetivo es entregar un insumo para el fortalecimiento de las capacidades y potencialidades de los autores de la Universidad Santo Tomás en el posicionamiento y visibilidad de sus publicacionesReport of the author metrics Oscar Fernando Acevedo Arango of the publications indexed in Google Scholar whose objective is to provide an input for the strengthening of the capacities and potentialities of the authors of the Santo Tomás University in the positioning and visibility of their publications.http://unidadinvestigacion.usta.edu.c
A user modeling pipeline for studying polarized political events in social media
No full textThis paper presents a user modeling pipeline to analyze discussions and opinions shared on social media regarding polarized political events (e.g., public polls). The pipeline follows a four-step methodology. First, social media posts and users metadata are crawled. Second, a filtering mechanism is applied to filter spammers and bot users. As a third step, demographics information is extracted out of the valid users, namely gender, age, ethnicity and location information. Finally, the political polarity of the users with respect to the analyzed event is predicted. In the scope of this work, our proposed pipeline is applied to two referendum scenarios (independence of Catalonia in Spain and autonomy of Lombardy in Italy) in order to assess the performance of the approach with respect to the capability of collecting correct insights on the demographics of social media users and of predicting the poll results based on the opinions shared by the users. Experiments show that the method was effective in predicting the political trends for the Catalonia case, but not for the Lombardy case. Among the various motivations for this, we noticed that in general Twitter was more representative of the users opposing the referendum than the ones in favor.Accepted Author ManuscriptWeb Information System
Enfurecer el pasado. Álvaro Bisama y Fernando Vallejo, biógrafos
No full textIt is a question of interrogating books by writers about writers, based on the contemporary question of affects: how does the "unspeakable" of emotion articulate with the effects of reading, author figures, the creation of affiliations, the rewriting of the past? For this, an emotion, fury, and two books, Almas en pena chapolas negras by Fernando Vallejo (1995) and Mala lengua. A portrait of Pablo de Rokha by Alvaro Bisama (2020). Two biographies of writers who have in common the staging of that passion by constantly articulating it with the presence of death and the corpse, that is, with melancholic obsessions. Both also propose an iconoclastic revision of the literary past, from a subjectivity that leaves aside truth, ethics and chronology to disrupt hierarchies and focus on the frontal conflict, on arbitrary violence as the driving force of the history of Chilean or Colombian literature. Affection ends up being the unexpected axis around which common issues such as value, tradition, conceptions of creation, modes of circulation are settled. Fury, as much as love, would be the irreducibly literary aspect of literature.Se trata de interrogar los libros de escritores sobre escritores, a partir de la pregunta contemporánea por los afectos. ¿Cómo se articula allí lo “indecible” de la emoción con los efectos de la lectura, las figuras de autor, la creación de filiaciones, las reescrituras del pasado? Para ello, una emoción, la furia, y dos libros, Almas en pena chapolas negras de Fernando Vallejo (1995) y Mala lengua. Un retrato de Pablo de Rokha de Álvaro Bisama (2020). Dos biografías de escritores que tienen en común la puesta en escena de esa pasión articulándola constantemente con la presencia de la muerte y del cadáver, o sea con obsesiones melancólicas. Ambos proponen también una revisión iconoclasta del pasado literario, desde una subjetividad que deja de lado la verdad, la ética y la cronología para desbaratar jerarquías y centrarse en el conflicto frontal, en la violencia arbitraria como motores de la historia de las letras chilenas o colombianas. El afecto termina siendo el inesperado eje alrededor del cual se dirimen cuestiones habituales, como el valor, la tradición, las concepciones sobre la creación, los modos de circulación. La furia, tanto como el amor, sería lo irreductiblemente literario de la literatura
Enraging the Past. Alvaro Bisama and Fernando Vallejo, Biographers
No full textSe trata de interrogar los libros de escritores sobre escritores, a partir de la pregunta contemporánea por los afectos. ¿Cómo se articula allí lo “indecible” de la emoción con los efectos de la lectura, las figuras de autor, la creación de filiaciones, las reescrituras del pasado? Para ello, una emoción, la furia, y dos libros, Almas en pena chapolas negras de Fernando Vallejo (1995) y Mala lengua. Un retrato de Pablo de Rokha de Álvaro Bisama (2020). Dos biografías de escritores que tienen en común la puesta en escena de esa pasión articulándola constantemente con la presencia de la muerte y del cadáver, o sea con obsesiones melancólicas. Ambos proponen también una revisión iconoclasta del pasado literario, desde una subjetividad que deja de lado la verdad, la ética y la cronología para desbaratar jerarquías y centrarse en el conflicto frontal, en la violencia arbitraria como motores de la historia de las letras chilenas o colombianas. El afecto termina siendo el inesperado eje alrededor del cual se dirimen cuestiones habituales, como el valor, la tradición, las concepciones sobre la creación, los modos de circulación. La furia, tanto como el amor, sería lo irreductiblemente literario de la literatura.It is a question of interrogating books by writers about writers, based on the contemporary question of affects: how does the "unspeakable" of emotion articulate with the effects of reading, author figures, the creation of affiliations, the rewriting of the past? For this, an emotion, fury, and two books, Almas en pena chapolas negras by Fernando Vallejo (1995) and Mala lengua. A portrait of Pablo de Rokha by Alvaro Bisama (2020). Two biographies of writers who have in common the staging of that passion by constantly articulating it with the presence of death and the corpse, that is, with melancholic obsessions. Both also propose an iconoclastic revision of the literary past, from a subjectivity that leaves aside truth, ethics and chronology to disrupt hierarchies and focus on the frontal conflict, on arbitrary violence as the driving force of the history of Chilean or Colombian literature. Affection ends up being the unexpected axis around which common issues such as value, tradition, conceptions of creation, modes of circulation are settled. Fury, as much as love, would be the irreducibly literary aspect of literature
Transactions Cost Theory influence in strategy research: A review through a bibliometric study in leading journals
No full textTransaction cost theory (TCT) is widely used in several management disciplines. Its value for explaining organizational phenomena and managers? decisions is well accepted and has been recognized with two Nobel laureates (Ronald Coase and Oliver Williamson). In this paper we examine the impact of the TCT on extant research in top tier management journals. We conduct a bibliometric study supported in the analysis of citations and co-citations to uncover the connections between authors and presumably theories. We conclude that the TCT, albeit its specific focus on the transactions as the unit of analysis, is present in a majority of management- and business-related research.transaction costs theory, bibliometric study, strategy research, review
Bopyrissa wolffi Markham 1978
No full textBopyrissa wolffi Markham, 1978 Figs 1, 2F, 9, Table 1 Bopyrissa wolffi Markham, 1978: 103–107, figs 1–5, table 1. Stegias clibanarii – Pearse 1932: 4–5, figs 22–26 (in part). — Schultz 1969: 323, fig. 514 (non stegias clibanarii). Pseudione sp. – Menzies & Glynn 1968: 17–18, figs 2A–B. — Markham 1972: 64; 1975a: 228. — McDermott 1974: 2. Bopyrissa wolffi – Markham 1979: 523 (in key), 524; 1986: 154; 2003: 72. — Kensley 1994: table 1. — Markham & Donath-Hernández 1990: 243. — Markham et al. 1990: 416. — Camp 1998: 134. — McDermott 2002: 33–40, tables 1, 3. — Boyko & Williams 2004: 359–361, 369. — RománContreras, 2008: 106 (in table 2). — McDermott et al. 2010: 8. — Cericola & Williams 2015: table 1. — An et al. 2018: 579, 589 (in key), table 1. — Williams et al. 2019: 92 (in key), 93 (in key), 95. — Klompmaker et al. 2022 fig. 5.2. Bopyrissa wolfii (sic) – Romero-Rodríguez & Martínez-Mayén 2018: 1191 (in table II). Material examined MEXICO • 1 ovigerous ♀ (2.18 mm TL), 1 ♂ (0.78 mm TL); Quintana Roo, Cozumel, Km 13 coastal road; 20º25′09″ N, 87º00′42″ W; 20 Apr. 1988; J.L. Villalobos et al. leg.; host ♀ of Clibanarius tricolor (3.20 mm SL); O. Valdez det. host; CNCR-36501 • 1 ovigerous ♀ (3.37 mm TL), 1 ♂ (1.15 mm TL); Quintana Roo, Ensenada Lamcom, NE border of Isla Blanca; 21º24′45.44″ N, 86º48′35.29″ W; 18 Jun. 2005; J.L. Villalobos et al. leg.; host ♂ of same species as for preceding (4.85 mm SL); J. Romero det. host; CNCR-36502-A • 1 ovigerous ♀ (3.32 mm TL), 1 ♂ (1.13 mm TL); same collection data as for preceding; host ♀ of same species as for preceding (4.75 mm SL); CNCR-36502-B • 1 ovigerous ♀ (4.90 mm TL), 1 ♂ (1.47 mm TL); Veracruz, south inlet of Laguna de Tamiahua; 21º16′45″ N, 97º26′41″ W; 21 Sep. 2011; J.L. Bortolini leg.; host ♀ of Clibanarius vittatus (Bosc, 1801) (7.50 mm SL); G. Cervantes det. hosts; CNCR-36503-A • 1 ovigerous ♀ (3.76 mm TL), 1 ♂ (1.20 mm TL); same collection data as for preceding; host ♀ of same species as for preceding (6.07 mm SL); CNCR-36503-B • 1 ovigerous ♀ (4.10 mm TL), 1 ♂ (1.04 mm TL); same collection data as for preceding; host ♀ of same species as for preceding (7.70 mm SL); CNCR-36503-C • 1 ovigerous ♀ (4.95 mm TL), 1 ♂ (1.64 mm TL); same collection data; host ♂ of same species as for preceding (8.00 mm SL); CNCR-36503-D • 1 ovigerous ♀ (4.50 mm TL), 1 ♂ (1.64 mm TL); same collection data; host ♂ of same species as for preceding (6.47 mm SL); CNCR-36503-E. Distribution Bopyrissa wolffi is distributed from North Carolina, Florida and Texas, USA, to the Bahamas, Bermuda, Puerto Rico and Mexico (Boyko & Williams 2004). In Mexico, this bopyrid had only been recorded parasitizing C. tricolor near Akumal, Quintana Roo (Markham et al. 1990); here, two more locations on this coast are added, Isla Blanca and Cozumel, parasitizing C. tricolor. Similarly, for the first time B. wolffi is recorded attached to C. vittatus in Laguna de Tamiahua, Veracruz (Fig. 1A), which is a new locality for this bopyrid in the Gulf of Mexico. McDermott et al. (2010) noted that only two hosts are recognized for B. wolffi, C. tricolor and C. vittatus. Remarks Both females (Figs 2F, 9A) and males (Fig. 9K–L) examined match well the description of Bopyrissa wolffi provided by Markham (1978); however, the following variations were observed: the marsupium of five females was partially or totally closed; first pair of oostegites differs in size, the one on the short side of the female was consistently larger than the one on the opposite side (Fig. 9B–E). Most females (n = 7) show the barbula with a single, stout and crenulated lateral projection (Fig. 9F), similar to that noted as variation and illustrated by Markham (1978: fig. 3b) but one of them (CNCR-36501) bears just a small bump on each side on the barbula (Fig. 9G), as well as pleomeres 1–3 distinct whilst pleomeres 4–5 are fused (Fig. 9H). Excepting one female (CNCR-36502-C) that had four pairs of pleopods biramous and the fifth uniramous, all other females examined had five pairs of pleopods biramous, with the endopod thinner and larger than exopod (Fig. 9I). Markham (1978) described the antennae of B. wolffi as “markedly reduced”, in our females the antennule was short and 3-segmented whilst the antenna was thin, long and 4-segmented, both bearing small apical setae (Fig. 9J). Likewise, in males of this species Markham (1978) noted the antennule of three segments and the antenna as “obscurely segmented (maybe of four segments)”, in the males examined both antennule and antenna were 3-segmented and of similar outline and size (Fig. 9K). The pleopods in our males were a pair of small bulges at middle of each pleomere, those in first pleomere were the largest and from pleomeres 2 to 5 gradually decreasing in size (Fig. 9K). Reproduction The average TL of ovigerous females (3.89 ± 0.93 mm) of P. wolffi was more than twice that reported (1.91 mm) by McDermott (1998), since this author recorded ovigerous females between 1.73 and 2.20 mm in size and the females with embryos examined here ranged from 2.18 mm TL to 4.95 mm TL (Table 1). This noticeable difference in sizes may explain the higher overall average fecundity calculated in our samples (2182.17 ± 1660.14 embryos) compared to the mean fecundity of 314 embryos calculated by McDermott (1998). Only the smallest ovigerous female (Table 1), with an evident loss of embryos (220 embryos) was below the range reported by McDermott (1998). The average length and width of embryos of B. wolffi by stage of development and epicaridium larvae are shown in Table 1. Sizes of embryos in egg stage ranged from 0.109 to 0.145 mm of length and between 0.091 and 0.127 mm of width, whilst the lengths of embryos in stage I varied from 0.145 to 0.182 mm and their width between 0.127 and 0.164 mm. Volume of embryo in egg stage ranged from 0.0005 to 0.0012 mm 3, and for embryos in stage I varied between 0.0012 and 0.0023 mm 3. The average volumes of both stages of development (Table 1) are comparable to those reported for other bopyrids of similar sizes (see Romero-Rodríguez & Álvarez 2020). The epicaridium larvae length ranged from 0.164 to 0.200 mm and the width between 0.109 mm and 0.145 mm. In both hermit crab species parasitized by B. wolffi a similar number of females and males were recorded, thus no statistical differences were found (χ 2 = 0.01, df =1; P <0.05), and both sexes were of similar average sizes: C. tricolor had an average size of 3.98 ± 1.10 mm of shield for females (n = 2) and 4.85 mm of shield for males (n = 1), whilst in C. vittatus the average size was 7.09 ± 0.89 mm of shield for females (n = 3) and 7.23 ± 1.08 mm of shield for males (n = 2). The prevalence estimated for B. wolffi was 3.36 %, eight parasitized hosts out of 238 individuals.Published as part of Romero-Rodriguez, Jesús & Álvarez, Fernando, 2023, Parasitic bopyrid isopods of hermit crabs (Anomura, Paguridae) from the Atlantic coast of Mexico, with notes on their reproduction and distribution, pp. 132-167 in European Journal of Taxonomy 861 on pages 153-156, DOI: 10.5852/ejt.2023.861.2073, http://zenodo.org/record/775375
Transposable elements and polyploid evolution in animals
No full text© The Author(s), 2018. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Current Opinion in Genetics & Development 49 (2018): 115-123, doi:10.1016/j.gde.2018.04.003.Polyploidy in animals is much less common than in plants, where it is thought to be pervasive in all higher plant lineages. Recent studies have highlighted the impact of polyploidization and the associated process of diploidy restoration on the evolution and speciation of selected taxonomic groups in the animal kingdom: from vertebrates represented by salmonid fishes and African clawed frogs to invertebrates represented by parasitic root-knot nematodes and bdelloid rotifers. In this review, we focus on the unique and diverse roles that transposable elements may play in these processes, from marking and diversifying subgenome-specific chromosome sets prior to hybridization, to influencing genome restructuring during rediploidization, to affecting subgenome-specific regulatory evolution, and occasionally providing opportunities for domestication and gene amplification to restore and improve functionality. There is still much to be learned from the future comparative genomic studies of chromosome-sized and haplotype-aware assemblies, and from post-genomic studies elucidating genetic and epigenetic regulatory phenomena across short and long evolutionary distances in the metazoan tree of life.Work in the laboratory is supported by R01GM111917 from the U.S. National Institutes of Health to I.A.2019-04-3
Estrategias de crecimiento intensivo para mejorar el nivel de posicionamiento y ventas de la empresa hotel “San Camilo” de Trujillo
No full textEl desarrollo del presente trabajo, tiene como propósito principal elaborar una propuesta de estrategias de crecimiento intensivo orientado a mejorar el nivel de posicionamiento y ventas de la Empresa HOTEL SAN CAMILO, en virtud de que en la provincia de Trujillo, existe un número considerable de tales organizaciones, en las cuales no se han tomado en cuenta este tipo de estrategias; que para el autor es de relevante importancia.
Han participado en la presente investigación según el muestreo probabilístico utilizado 432 clientes, a los cuales se les aplico la encuesta, los propietarios del establecimiento a quienes se les aplico la entrevista, el diseño de contrastación utilizado es el de una sola casilla con Pre y Pos test (simulado) y la estadística descriptiva para el análisis de los datos.
Los resultados de la presente investigación han permitido demostrar que las estrategias de crecimiento intensivo (penetración de mercado y desarrollo del producto) mejora el posicionamiento y ventas de la empresa HOTEL SAN CAMILO considerando su aplicación en un corto y mediano plazo dentro del mercado de la ciudad de Trujillo.The development of this work, whose main purpose is to develop a proposal for
intensive growth strategies aimed at improving the level of positioning and sales
HOTEL SAN CAMILO Company, under which the province of Trujillo, a
considerable number of such organizations, which have not been taken into
account such strategies; that the author is of significant importance.
They have participated in this research as probability sampling used 432 clients,
which we applied to the survey, establishment owners who are applied the
interview, the design of contrasting used is one box with Pre and Post test
(simulated) and descriptive statistics for data analysis.
The results of this investigation have demonstrated that intensive growth strategy
(market penetration and product development) improves positioning and sales
company HOTEL SAN CAMILO considering its application in a short and
medium term within the market town TrujilloTesi
Successful airway management of a patient with progressive supranuclear palsy during the induction of anesthesia
No full textAnathelges hyptius
No full textAnathelges hyptius (Thompson, 1902) Figs 1, 2A, 3, Table 1 Stegophryxus hyptius Thompson, 1902: 53–56, pls. 9–10. Stegophryxus hyptius – Richardson 1904: 59; 1905: 532–535, 537, figs 578, 579. — Rathbun 1905: 48. — Sumner et al. 1913a: 136; 1913b: 661. — Kunkel 1918: 236. — Reinhard et al. 1947: 70–72. — Reinhard 1949: 17, 18, 20, 21, 27, 29, 30; 1956: 101. — Caullery 1950: 97. — Reinhard & Buckeridge 1950: 131. — Caullery 1952: 76. — Reverberi 1952: 292. — von Brand 1952: 256, 271, table 41; 1966: 222, table 38. — Szidat 1959: 504. — Florkin 1960: 405. — Danforth 1963: 11, 20. — Bowman 1964: 105, 107–109, pl. 14, fig. 22. — Noble & Noble 1964: 392–393, figs XVI-5a, 5b, 5c. — Smith 1964: 105. — Oguro 1967: 67 (in table 3). — Bourdon 1968: 133. — Schultz 1969: 322, fig. 513. — Kaestner 1970: 463. — Gosner 1971: 476. — Markham 1972: 73; 1974: 33, 35, 38, 40, figs 1–3; 1978: 102, 111, 114, 116, table 1; 1988: 3, 45–46, 57, table 1; 2003: 73–74. — Adkison & Heard 1978: 408. — García-Gómez 1983: 22, 37. — Overstreet 1983: 225. — Adams et al. 1987: 127. — Greenwood & Adams 1987: 106. — Anderson 1990: 290. — Korpelainen 1990: 165. — McDermott 1998: 1042–1044; 2001: 629, 634–635; 2002: 39. — Boyko & Williams 2003: 796, 797, 798. — Meconcelli et al. 2015: 43. Stegophrixus hyptius – Nierstrasz & Brender à Brandis 1931: 197–198. Stegophryxus hyptias (sic) – Miner 1950: 450, 453, pl. 145. Stegophryxus sp. – Baffoni 1953: 447. — Reinhard 1956: 93. — Kaestner 1967: 1161; 1970: 425, 463. ?”Male bopyrid isopod” – Lemaitre et al. 1982: 697, fig. 7C. Anathelges hyptius – Boyko & Williams 2003: 798–800, figs 2–3; 2004: 361, 369; 2009: 203. — RománContreras & Martínez-Mayén 2011: 1145–1147, 1150. — Romero-Rodríguez & Román-Contreras 2013: 646 (in table 3). — Cericola & Williams 2015: 238 (in table 1). — Ewers-Saucedo 2019: 225. — Romero-Rodríguez & Álvarez 2020: 226 (in table 1). — Aguilar-Perera 2022: 115 (in table 1). Anathelges hyptuis (sic) – Schotte et al. 2009: 981. Anathelges cf. hyptius – Diaz & Roccatagliata 2006: 331–340, figs 1–6. — Pardo et al. 2009: 2041– 2042, 2052–2053, table 1. Material examined MEXICO • 1 ovigerous ♀ (2.45 mm TL), 1 ♂ (1.64 mm TL); Campeche, Laguna de Términos, Estero Pargo; 18º38′05.64″ N, 91º46′16.39″ W; 6 Jun. 1981; V. Solís et al. leg.; host ♀ of Pagurus maclaughlinae García-Gómez, 1982 (2.50 mm SL); J. Romero det. host; CNCR-36504 • 1 ovigerous ♀ (3.80 mm TL), 1 ♂ (1.98 mm TL); same locality as for preceding; 14 Nov. 1984; same collector; same host data as for preceding (2.97 mm SL); CNCR-36507 • 1 ovigerous ♀ (3.00 mm TL), 1 ♂ (1.31 mm TL), same locality as for preceding; 20 May 1987; same collector; host ♂ of same species as for preceding (2.25 mm SL); CNCR-36524-A • 1 ovigerous ♀ (3.70 mm TL), 1 ♂ (1.53 mm TL); same collection data as for preceding; same host data as for preceding (3.60 mm SL); CNCR-36524-B • 19 ovigerous ♀♀ (3.88 ± 0.62 mm TL), 19 ♂♂ (1.89 ± 0.28 mm TL), 2 cryptoniscus larvae (0.63 ± 0.07 mm LT); same locality; 8 Dec. 1987; same collector; host 10 ♀♀, 9 ♂♂ of same species as for preceding (3.47 ± 0.65 mm SL); CNCR-36525 • 1 ovigerous ♀ (3.17 mm TL), 1 ♂ (1.78 mm TL); Campeche, Laguna de Términos, La Bayoneta; 18°46′42.0″ N, 91°29′14.7″ W; 3 Oct. 1981; same collector; host ♀ of same species as for preceding (3.17 mm SL); J. Romero det. hosts; CNCR-36505-A • 1 cryptoniscus larva (0.56 mm TL); same locality; same host data as for preceding (3.17 mm SL); CNCR-36505-B • 1 ♀ (4.25 mm TL), 1 ♂ (2.00 mm TL); same locality; 3 Nov. 1981; same collector; detached from host; CNCR-36527 • 1 ovigerous ♀ (2.13 mm TL), 1 ♂ (1.31 mm TL); Campeche, Laguna de Términos, Punta Zasnath; 18º46′20.77″ N, 91º19′39.16″ W; 1 Aug. 1984; same collector; host ♀ of same species as for preceding (2.40 mm SL); CNCR-36506-A • 1 ovigerous ♀ (2.00 mm TL), 1 ♂ (1.30 mm TL); same locality; same host data as for preceding (2.03 mm SL); CNCR-36506-B • 1 ovigerous ♀ (4.00 mm TL), 1 ♂ (1.96 mm TL); Campeche, Laguna de Términos, Isla Pájaros; 18º38′08.22″ N, 91º41′45.72″ W; 10 Mar. 1981; same collector; same host data as for preceding (3.33 mm SL); CNCR-36526 • 1 ♀ (3.40 mm TL), 1 ♂ (1.55 mm TL); Campeche, Laguna de Términos, Punta Gorda; 18º43′18.34″ N, 91º33′50.17″ W; 14 Nov. 1984; same collector; detached from host; CNCR-36528. Distribution Anathelges hyptius has one of the largest geographical ranges for any bopyrid species in the western Atlantic (Fig. 1), from Massachusetts, USA, to Curaçao and the Bahamas (Boyko & Williams 2004), which may be related to the eight species of pagurids used as hosts throughout its range (Markham 1978; Boyko & Williams 2004): Iridopagurus caribbensis (A. Milne-Edwards & Bouvier, 1893; I. margaritensis García-Gómez, 1983; Pagurus annulipes (Stimpson, 1860); P. brevidactylus (Stimpson, 1859); P. longicarpus Say, 1817; P. maclaughlinae; P. provenzanoi Forest & de Saint Laurent, 1968 and P. stimpsoni (A. Milne-Edwards & Bouvier, 1893). It has been suggested that its geographical distribution extends to Argentina and Chile parasitizing two more hosts (Diaz & Roccatagliata 2006; Pardo et al. 2009): P. comptus (White, 1847) and P. villosus Nicolet in Gay, 1849, respectively. In Mexico it has only been recorded in Laguna de Términos parasitizing a single female of P. longicarpus (Román-Contreras & Martínez-Mayén 2011), so this record does not represent a new locality for this bopyrid but P. mclaughlinae is recorded as new host in the area. Remarks Our material (Figs 2A, 3A, F) conforms well with the characters proposed for A. hyptius by Thompson (1902), but some variations were observed. The barbula of adult females consists of a single slightly acute and curved projection on each side and two foliaceus plates in the medial margin (Fig. 3B). The barbula of this species was described with three curved processes on each side but only two lateral projections were illustrated (Thompson 1902: plate 9, fig. 7). However, the observed specimens agree with the subsequent illustrations and description of the barbula provided by Markham (1974: fig. 1d) and Diaz & Roccatagliata (2006: fig. 4b). Overall, the first pair of oostegites of the adult females examined (Fig. 3C–D) are similar to those described by Thompson (1902), although this author did not define the internal ridge. Markham (1974: fig. 1e) illustrated it smooth and almost straight, contrasting with the inner ridge thickened in the middle portion and bearing one small digitation proximally recorded in our adult females (Fig. 3D), which coincides with what Diaz & Roccatagliata (2006: fig. 5g) reported for an adult female of A. cf. hyptius parasitizing the abdomen of P. comptus in Argentina. Likewise, an ovigerous female (36525-Q) had no uropods thus the last segment of pleon had a round appearance. The maxilliped was similar to that noted by Thompson (1902: pl. 9, fig. 5) but the anterior segment was somewhat rectangular in outline when the external lateral margin, that tends to bend inwards, is extended; the surface of both anterior and posterior segments has a rough appearance (Fig. 3E). Reproduction Sizes of the two adult females without embryos in the marsupium were 3.40 and 4.25 mm TL, both paired with a male but detached from the host. Average TL of the ovigerous females (n = 23) was 3.65 ± 0.73 mm and ranged from 2.13 to 5.53 mm TL (Table 1), which are smaller than the range of females carrying embryos (5.98–6.56 mm long) reported by McDermott (1998); however, the overall average fecundity calculated (1906.67 ± 1021.51 embryos) is close to the average number of embryos (2462.33 ± 1,181, calculated from original data) reported by McDermott (1998). The lowest (480 embryos) and highest (4572 embryos) fecundities were recorded from the ovigerous females with the minimum and maximum TL, respectively. The latter could be explained by the significant (τ 16 = 5.74, p <0.05) and positive (r = 0.67) relationship calculated between fecundity and the size of the ovigerous females: fecundity = 1808 + 1031.10 (TL). The highest number of embryos recorded (Table 1) was higher than the maximum fecundity (3437 embryos) reported by McDermott (1998) in a 6.56 mm female. The average length and width of embryos of A. hyptius by stage of development and epicaridium larvae are shown in Table 1. Sizes of embryos in egg stage ranged from 0.11 to 0.15 mm of length and between 0.09 and 0.13 mm of width, whilst the length of embryos in stage I varied from 0.13 to 0.16 mm and their width was between 0.09 and 0.15 mm. These sizes are smaller than those reported by McDermott (1998) for embryos in an early stage (0.172 ± 0 mm long and 0.144 ± 0.4 mm wide), this difference may be due to the low number of embryos examined by the latter author (n = 10). Volumes of embryos in egg stage ranged from 0.0005 to 0.0013 mm 3, and for embryos in stage I varied between 0.0006 and 0.0019 mm 3. The average volume of both stages of development (Table 1) is similar to those reported for other bopyrids of comparable sizes (see Romero-Rodríguez & Álvarez 2020). The epicaridium larvae length ranged from 0.15 to 0.20 mm and the width between 0.09 and 0.15 mm. The three cryptoniscus larvae recorded, one attached dorsally to the posterior limit of the host’s cephalothorax and two more attached to the female’s marsupium (see below), matched well the description but were smaller (0.63 ± 0.07 mm TL, 0.25 ± 0.02 mm width) than the length of 0.7 mm provided by Thompson (1902). The average TL of males was 1.80 ± 0.30 mm, and varied from 1.33 to 2.25 mm TL which is similar to that recorded by McDermott (1998) and Boyko & Williams (2003), but smaller than the 3 mm males reported by Thompson (1902). Except for one male, that was attached transversally between pleomeres 1–2 of the female, all males were inside the females’ brood pouch between pereomeres 6–7, transversely aligned with their head directed towards the right side of the female and attached to the last oostegites. Although this is the typical position reported for males of A. hyptius, Markham (1974) registered during live observations that males can get out from the brood pouch and crawl all over the female’s body. The number and average size by sex of individuals of P. mclaughlinae parasitized by A. hyptius were rather similar, 14 females (3.28 ± 0.58 mm SL) and 13 males (3.32 ± 0.72 mm SL) were recorded. No statistical differences by sex were found (χ 2 = 0.08, df = 1; P <0.05). The abdomen of a P. mclaughlinae male of 3.36 mm SL was simultaneously parasitized by A. hyptius and an undetermined rhizocephalan; one externa with two lobes of different sizes; were located below the bopyrid female, this last one was tightly attached to the host abdomen, with its head directed towards the host pleon, while one of its pereomeres was holding the largest externa. The male of A. hyptus was inside the marsupium of this female, additionally two cryptoniscus larvae were observed attached to the inner side of the oostegites of this bopyrid female, one on the lateral margin of the left oostegite 5 and another one on the anterior margin of the oostegite 3 of the right side. A total of 475 hermit crabs were counted in the samples, of which 29 were parasitized by A. hyptius, this represents a prevalence of 6.11 %.Published as part of Romero-Rodriguez, Jesús & Álvarez, Fernando, 2023, Parasitic bopyrid isopods of hermit crabs (Anomura, Paguridae) from the Atlantic coast of Mexico, with notes on their reproduction and distribution, pp. 132-167 in European Journal of Taxonomy 861 on pages 134-139, DOI: 10.5852/ejt.2023.861.2073, http://zenodo.org/record/775375
- …
