Volume 21, Issue 1 - 15 January 2015
Volume 21, Issue 1 - 15 January 2015
New Scientific pubblication - started delivery on January 15, 2015
Eugenie Clark, Diane R. Nelson and Rachel Dreyer: Nesting sites and behavior of the deep water triggerfish Canthidermis maculata (Balistidae) in the Solomon Islands and Thailand, pp. 1-38
We observed the nesting behavior, eggs, and larvae of the triggerfish Canthidermis maculata in the Solomon Islands and in Thailand. We found groups of 3 to over 120 nests, extending from shallow water (6 m) to, more commonly, deeper water (35-40 m). Nests, approximately 1 m diameter, sometimes occupied every available space in the soft sand bottom between reef contours, coral heads, and/or boulders. Nesting sites were usually found near drop-offs into deep water (300+ m). We observed active nests with one or two fish near or in the nest. The guarding C. maculata aerated the nest and defended it against other fish species, except herbivorous fish which grazed around the rim of the nest. Color pattern changes on the head and pectoral region occurred when the fish were courting and/or defending a nest. We observed courtship behavior near dusk. Demersal eggs collected from nests hatched during the night in containers aboard our vessel, and the pelagic larvae immediately swam upward.
Canthidermis maculata with dark pectoral marking over its nest in foreground, Mbaleva Island, Solomon Islands. Photo © D. Seifert/www.douglasunderwater.com, 2014
María de las Mercedes Azpelicueta and Stefan Koerber: On some freshwater fish species reported by Perugia (1891) from Argentina, pp. 39-46
Perugia (1891) described and recorded many fish species from Argentina, Paraguay and Brazil, whose voucher specimens were deposited at the Museo Civico di Storia Naturale di Genova (MSNG). Several species recorded by Perugia (1891) from Argentina were misidentified, which lead to erroneous citations of species for the Rio de la Plata basin during more than one century, species which in fact are restricted to river drainages from northern South America. The reevaluation of the specimens identified by Perugia (1891) as Pimelodus cristatus Müller & Troschel, Ramphichtys brevirostris Steindachner, and Myletes asterias Müller & Troschel, and the records of Serrasalmo humeralis Valenciennes, and Serrasalmo gymnogenys Günther allowed us to rectify these records and exclude these species from the fish fauna lists of both the Rio de la Plata basin and Argentina.
MSNG 8133, Pimelodella gracilis (Valenciennes 1835), 87.19 mm SL, Argentina, Tucumán.
Gerald R. Allen and Mark V. Erdmann: Festucalex rufus, a new species of pipefish (Syngnathidae) from Milne Bay Province, Papua New Guinea, pp. 47-51
A new species of syngnathid pipefish, Festucalex rufus is described from Milne Bay Province, Papua New Guinea on the basis of four specimens, 26.5-37.8 mm SL collected from coral reef habitat in 10-20 m depth. It is distinguished from other members of the genus on the basis of a combination of features including a short snout (2.8-3.2 in head length), relatively low pectoral-ray count (10-11), and a lateral trunk ridge that terminates on the penultimate trunk ring. It is a small species with observed and collected individuals generally less than 40 mm SL and the single brood-pouch male collected measures 36.3 mm SL.
Festucalex rufus, preserved holotype, 37.8 mm SL, showing close-up view of head. Photo by G. R. Allen.
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