En el presente trabajo se describe y proporciona información sobre las especies del género Conus (Neogastropoda: Conidae) mantenidas en el Laboratorio de Biología y Sistemática de Invertebrados Marinos de la Facultad de Ciencias Biológicas (LaBSIM) y en el Departamento de Malacología y Carcinología del Museo de Historia Natural de la Universidad Nacional Mayor de San Marcos (MUSM). Se estudió material colectado en 9 localidades del Departamento de Tumbes, y 16 del Departamento de Piura. La colecta intensiva se llevó a cabo en abril del año 2007 y fue esporádica en los años posteriores. De las 16 especies reportas para Perú hasta antes de este estudio, se cuenta con material correspondiente a 11 de ellas: Conus (Conus) gladiator Broderip, 1833; Conus (Asprella) arcuatus Broderip & Sowerby, 1829; Conus (Cylinder) lucidus Wood, 1828; Conus (Leptoconus) poormani Berry, 1968;...

Se reportan por primera vez para el mar peruano seis especies de gasterópodos: Sthenorytis turbinus Dall, 1908, Crucibulum (Crucibulum) umbrella (Deshayes, 1830), Favartia (Murexiella) lappa (Broderip,1833), Cantharus (Cantharus) shaskyi Berry, 1959, Cantharus (Solenosteira) macrospira (Berry, 1957), Cancellaria (Bivetopsia) haemastoma Sowerby, 1832. Se informa sobre la distribución, el hábitat y comentarios relevantes acerca de cada una de las especies.

The following species of Bivalvia are recorded for the first time for Peruvian sea: Ennucula panamina (Dall, 1908), Nuculana (Nuculana) loshka, (Dall,1908), Saccella laeviradius (Pilsbry & Lowe, 1932), Liralucina approximata (Dall, 1901), Carditamera radiata (G. B. Sowerby I, 1833), Carditella (Carditella) naviformis (Reeve, 1843); Macoma (Psammacoma) elytrum Keen, 1958, Psammotreta (Psammotreta) pura (Gould, 1853), Sphenia fragilis (H. Adams & A. Adams, 1854) y Caryocorbula amethystina Olsson, 1961. Se informa sobre la distribución, el hábitat y comentarios relevantes sobre cada una de las especies.

Seis especies de Bivalvia: Adrana sowerbyana (Orbigny, 1845); Malletia goniura Dall, 1890; Mytilus strigatus Hanley, 1843; Leiosolenus spatiosa (Carpenter, 1857); Pinna rugosa G.B. Sowerby I, 1835 y Delectopecten zacae (Hertlein, 1935) se reportan por primera vez para aguas peruanas. Se da información sobre la distribución, el hábitat y comentarios relevantes de cada una de las especies.

Cinco especies de gasterópodos: Northia pristis (Deshayes in Lamarck, 1844), Macron aethiops (Reeve, 1847), Latirus concentricus (Reeve, 1847), Terebra elata, Hinds, 1844 y Carinodrilla adonis Pilsbry & Lowe, 1932, se reportan por primera vez para aguas tropicales del mar peruano. Se da información sobre la distribución, el hábitat y comentarios relevantes sobre cada una de las especies.

Se reporta por primera vez para el Perú a la «estrella de mar» Henricia obesa (Sladen, 1889) (Asteroidea: Echinasteridae), hallada en aguas frías, dentro de los límites de la Provincia Peruana.

En el presente trabajo se realiza una revisión taxonómica de la familia Calyptraeidae Lamarck, 1809, en la costa Peruana. Se confirma la presencia de 17 especies de las 19 reportadas por diversos autores. Crepidula arenata (Broderip, 1834) es sinónimo de C. excavata (Broderip, 1834). Se da información sobre la distribución geográfica y algunas relaciones ecológicas.

We report 8 species of Ellobiidae from the Peruvian coast, which belong to the subfamilies Ellobiinae: Ellobium stagnale (Orbigny, 1835) and Sarnia frumentum Petit, 1842; Melampodinae: Melampus carolianus (Lesson, 1842), Melampus olivaceus Carpenter, 18574 and Detracia graminea Morrison, 1846; and Pedipedinae: Marinula acuta (Orbigny, 1835), Marinula concinna (C.B Adams, 1852) and Marinula pepita King, 1831. Six species live associated to the mangrove of the department of Tumbes, and two in boulder beaches in the limits of the Peruvian Province. Four tropical species are registered for the first time in the Peruvian Sea: A. stagnale, M. olivaceus, D. graminea and M. acuta.

The incursion of 25 tropical species of mollusks and 15 of crustaceans have been analyzed. This species were registered among the years 1972 and 2003, time in which five El Niño events (EN) were occurred. Presence of the tropical species in the Peruvian Province would be related to larvae transport for benthonic species and juvenile for pelagic species, both stimulated by movements of the masses of waters. It is possible that some species have found «refuge areas» where to be developed and to remain, these species would display a discontinuous distribution in the Peruvian Province, like it is the case of Malea ringens, Prunum curtum and Bulla punctulata. Other species that intrude when typical oceanographic conditions of an event appear EN, apparently disappear when recovering the conditions «No Nino».

The following species of marine bivalve mollusks were recorded for the first time from the Peruvian sea: Glycymeris (Axinactus) delessertii (Reeve, 1843); Botula cylista Berry, 1959; Parahyotissa (Pliohyotissa) quercinus (Sowerby II, 1871); Pitar (Pitar) helenae Olsson, 1961; Eurhomalea lenticularis (Sowerby I, 1835); and Cardiomya planetica (Dall, 1908). Description, habitat and the geographical distribution are cited for each species.

Seis especies de bivalvos: Thyasira flexuosa (Montagu, 1803); Diplodontina tumbesiana Stempell, 1899; Retrotapes exalbidus (Dillwyn, 1817); Pandora (Pandorella) cornuta C.B. Adams, 1852; Entodesma cuneatum (Gray, 1828); Periploma (Cricoploma) carpenteri Dall, 1896 se reportan por primera vez para el Mar Peruano. Se incluyen datos sobre la distribución, el hábitat y comentarios relevantes de cada una de las especies.

The following species of Bivalvia have been recorded for the first time for Peruvian waters: Nucula (Nucula) iphigenia (Dall, 1908); Ennucula cardara (Dall, 1916); Nuculana (Nuculana) extenuata (Dall, 1897); Orthoyoldia panamensis (Dall, 1908). These bivalves were collected in the platform and continental slope down to depths of 864 meters.

Four species of marine bivalve mollusks, Nuculana (Jupiteria) cuneata (Sowerby, 1833), Isognomon (Isognomon) janus Carpenter, 1857, Ostrea conchaphila Carpenter, 1857 and Mysella (Rochefortia) molinae Ramorino, 1968 are reported for the first time from Peruvian sea. Data are included on the geographical distribution and habitat of each species.

The present state of knowledge on the aquatic mollusks of Peru is reviewed herein. Marine and freshwater mollusks are treated separately, offering information on numbers of families, genera and known species, their geographical distribution, their conservation status and utilization by man. Updated species lists are included.

La diversidad faunística de la zona intermareal rocosa del departamento de Lima, Perú, fue estudiada en 16 localidades, con énfasis en la dominancia relativa de las especies y su distribución vertical. Se registró 175 especies de invertebrados incluidos en 11 Phyla, y con predominio de los moluscos (79 especies), crustáceos (44 especies) y poliquetos (30 especies), los tres taxa que caracterizan el bentos marino. Considerando los estudios conocidos, el 41% del total de las especies está presente en la comunidad de Perurriytilus jourpuratus, 34% en Semimytilus algosus y 50% en Phragmatopoma moerchi. La diversidad y la zonación es generalizada para la Provincia Peruana.

Five species of marine gastropods are reported for the first time from Peru: Crepidula nivea Lamarck, 1799, Neosimnia aequalis (Sowerby, 1832), Simnialena rufa (Sowerby, 1832), Nitidiscala elenense (Sowerby, 1844) and Trigonostoma (Ventrilia) bullatum (Sowerby, 1832). Data on habitat and geographical distribution of any one of the species reported is included.

The discovery of mollusks that normally are distributed in the boundaries of Panamanian Province in many localities of the Peruvian Province between years 1972 and 1994, period in which several events appeared "El Niño". Fifteen species of mollusks was possible determine, that extend own distribution: Pteria sterna, Orobitella peruviana, Cryptomya califórnica, Cerithium (T) stercusmuscarum, Malea ringens, Hexaplex brassica, Thais styllmanberryi, T. (M.) triangularis, T. (T.) callaoensis, Acanthina brevidentata, Purpura pansa, Neorapana muricata, Anachis (C.) nigricans, Cancellaria (C.) decussata and C. (B.) chrysostoma. Variability in the boundaries of the biogeographics provinces of the Peruvian Coast, controlled by the ENSO, has been postuled.

This paper deal with seven species of Acmaeidae Scurria viridula (Lamarck), S. parasitica (Orbigny), S. variabilis (Sowerby), S. zebrina (Lesson), Collisella orbignyi (Dall), C. ceciliana (Orbigny) and C. araucana (Orbigny) reported along the rocky along Lima Department. Information concerned with geographical and vertical distribution, and others ecological data are also added.

Thirty-four samples of mussel assemblages were studied in the rocky mid-littoral zone at 10°45'38"S - 12°57'39"S, in the department of Lima, Peru. Such samples were taken periodically, between June and November, 1972. Using the biological index method, two kinds of communities were determined for the area: community of Perumytilus purpuratus (Lamarck, 1819), in the mid-horizon of the mid-littoral zone and community of Semimytilus algosus (Gould, 1850), in the lower horizon of the mid-littoral zone.

In the present paper the species of Donax Linnaeus, 1758 in Peru are reviewed. The presence of 7 out of the 11 species is confirmed: D. asper Hanley. 1845; D. caelatus rothi Coan, 1983; D. obesulus Reeve, 1854; D. carinatus Hanley, 1843; D. transversus Sowerby 1,1825; D. californicus Conrad, 1837 and D. marincovichi Coan, 1983; in addition, one is recorded for the first time (D. punctatostriatus Hanley, 1843) in Peruvian waters. Information on the distribution geographical and some ecological relations is presented.