Browsing by Author "Mattoni, Camilo I."
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Item Bundles of sperm : structural diversity in scorpion sperm packages illuminates evolution of insemination in an ancient lineage (American Museum novitates, no. 3993)(American Museum of Natural History., 2022-12-13) Vrech, David E.; Peretti, Alfredo V.; Prendini, Lorenzo; Mattoni, Camilo I.The spermatozoa of scorpions are often bundled together, forming a type of sperm conjugation known as a sperm package. Sperm packages may be found inside the testes and seminal vesicles but vanish in the female atrium, leaving free spermatozoa. Previous studies, based on a limited number of taxa, suggested a diversity of sperm package morphology across the order Scorpiones C.L. Koch, 1850. However, the sperm packages of most scorpion taxa remained unknown. The present study provides the first systematic survey of sperm package morphology across the order, covering 89 exemplar species in 66 genera and 19 families representing all suprafamilial ranks, with a more detailed investigation of the family Bothriuridae Simon, 1880. Whereas all exemplar species of scorpions exhibit sperm packages, Buthida Soleglad and Fet, 2003, including Chaerilidae Pocock, 1893, and most Buthidae C.L. Koch, 1837, present unorganized sperm or loosely organized bundles. Although the details vary, three main types of sperm packages may be recognized in all other families: single folded; straight; and multiple folded. Subtypes may be identified according to general shape and folding patterns, mainly among sperm packages that are folded multiple times. Single-folded sperm packages are the most common type observed in the order. Although most sperm packages lack a covering, a conspicuous secretion sheath may be evident, e.g., in some Chactidae Pocock, 1893. Sperm packages vary in length from 112–354 μm and bent sperm packages are not necessarily longer than straight sperm packages. Four exemplar species of Bothriuridae reveal that variation in sperm count within a single sperm package is consistent with the count derived in spermatogenesis. The diversity of sperm packages suggests a path from free spermatozoa, via bent sperm packages, to other forms. Sperm packages may aid in the transport, cooperation, competition, and survival of spermatozoa. The diverse morphology, function, and evolution of sperm packages merit further investigation.Item The genus Brachistosternus (Scorpiones, Bothriuridae) in Chile, with descriptions of two new species ; American Museum novitates, no. 3564(New York, NY : American Museum of Natural History, 2007) Ojanguren-Affilastro, Andrés A.; Mattoni, Camilo I.; Prendini, Lorenzo.We review the taxonomy of the Brachistosternus Pocock, 1893 scorpions of Chile, providing revised diagnoses, comprehensive distribution maps (based on all known locality records), and an illustrated key to all Chilean species of the genus. Two new species, Brachistosternus (Leptosternus) chango, n.sp., and Brachistosternus (Leptosternus) kamanchaca, n.sp., are described from northern Chile. The phylogenetic affinities of B. chango are unclear. Some characters suggest that this species may be related to Brachistosternus (L.) artigasi Cekalovic, 1974 but others suggest that it may be related to Brachistosternus (L.) roigalsinai Ojanguren Affilastro, 2002. Brachistosternus kamanchaca, in contrast, appears to be closely related to Brachistosternus (L.) donosoi Cekalovic, 1974 and other species from the plains of northern Chile and southern Perú.Item Rumikiru, n . gen. (Scorpiones, Bothriuridae), a new scorpion genus from the Atacama Desert. (American Museum novitates, no. 3731)(American Museum of Natural History., 2012-02-08) Ojanguren-Affilastro, Andrés A.; Mattoni, Camilo I.; Ochoa, J. A. (José A.); Prendini, Lorenzo.Rumikiru, n. gen., a new bothriurid scorpion genus from the coastal Atacama Desert, Chile, is described. This is the first scorpion genus endemic to northern Chile. It is most closely related to Pachakutej Ochoa, 2004, from the inter-Andean valleys of Peru. Orobothriurus lourencoi Ojanguren-Affilastro, 2003, is transferred to the new genus and redescribed, creating Rumikiru lourencoi (Ojanguren-Affilastro, 2003), n. comb., and a second species of the genus, Rumikiru atacama, n. sp., is described.Item Systematic revision of the Andean scorpion genus Orobothriurus Maury, 1976 (Bothriuridae) : with discussion of the altitude record for scorpions. (Bulletin of the American Museum of Natural History, no. 359)(American Museum of Natural History., 2011-11-23) Ochoa, J. A. (José A.); Ojanguren-Affilastro, Andrés A.; Mattoni, Camilo I.; Prendini, Lorenzo.The systematics of the Andean scorpion genus, Orobothriurus Maury, 1976 (Bothriuridae Simon, 1880), is revised. New locality records, obtained during recent field expeditions, distribution maps, and a key to identification of the 15 known species, are provided. Six new species are described: Orobothriurus calchaqui, n. sp., from northwestern Argentina; Orobothriurus compagnuccii, n. sp., from the central Andes of Argentina; Orobothriurus huascaran, n. sp., from central Peru; Orobothriurus quewerukana, n. sp., from southern Peru and northern Chile; Orobothriurus ramirezi, n. sp., from central Chile; and Orobothriurus tamarugal, n. sp., from northern Chile. The known distribution of Orobothriurus and the altitude record for scorpions are discussed. The world's altitude record for a scorpion, previously reported as 5550 m, is demonstrated to be 4910 m.Item Systematic revision of the granulatus group of Urophonius Pocock, 1893 (Scorpiones, Bothriuridae), with description of a new species from central Chile. (American Museum novitates, no. 3695)(American Museum of Natural History., 2010) Ojanguren Affilastro, Andrés A.; Ochoa, J. A. (José A.); Mattoni, Camilo I.; Prendini, Lorenzo.A systematic revision of the granulatus group of the bothriurid scorpion genus Urophonius Pocock, 1893 is presented. Urophonius pizarroi, n. sp., a new species from central Chile, is described. Urophonius granulatus Pocock, 1898, Urophonius somuncura Acosta, 2003, and Urophonius tregualemuensis Cekalovic, 1981, are redescribed using modern standards. The adult males of U. somuncura and U. tregualemuensis are described for the first time. A distribution map and key to the species of the granulatus group are provided, along with a discussion of their phenology.