Hydrozoa

RESUMEN. Se presenta el primer inventario de corales, octocorales y anémonas para el arrecife Enmedio, eco-sistema que forma parte del Sistema Arrecifal Lobos-Tuxpan (SALT). La información fue recabada de abril 2014 a noviembre 2015, realizando muestreos aleatorios en cinco sitios de las zonas de sotavento, planicie y barlovento. Las zonas arrecifales se caracterizaron mediante el número de especies registradas; y con base en el índice de Jaccard se determinaron diferencias/semejanzas. Se registró un total de 46 especies, las cuales están representadas por dos clases, seis órdenes, 25 familias y 31 géneros. El Orden Scleractinia fue el más diverso en especies. Se amplía el ámbito de distribución de Palythoa grandis y Eunicea mammosa para el suroeste del Golfo de México. Se adicionan 10 especies de anémonas y cinco de corales escleractinios como nuevos registros para el SALT. Las zonas arrecifales son disímiles en composición de especies y definen una marcada zonación, siendo sotavento la más importante por concentrar mayor riqueza de especies, atributo que decrece hacia barlovento. El arrecife Enmedio se considera importante en riqueza de especies y amerita especial atención al presentar tres especies con estatus de protección especial (Acropora cervicornis, Acropora palmata y Plexaurella dichotoma) de acuerdo a la Norma Oficial Mexicana. ABSTRACT. The present work reports the first inventory of corals, sea anemones, zoanthids and octocorals of the Enmedio reef, ecosystem that is part of the Lobos-Tuxpan Reef System. The information was gathered during the April 2014-November 2015 period. Five sampling sites were established in the leeward, flatland and wind-ward area. At each site random surveys were carried out to record species. The reef areas were characterized by considering the number of species recorded and using the Jaccard index to determine differences/similarities. A total of 46 species were recorded, which are represented by two classes, six orders, 25 families and 31 genera. The order Scleractinia was the most diverse in species. There is an extension in the distribution range of Palythoa grandis and Eunicea mammosa for the southwest Gulf of México. Ten species of sea anemones and five species of scleractinian corals were added as new records to the Lobos-Tuxpan Reef System. The reef areas are dissimilar in species composition and define a marked zonation. The leeward zone had the most importance because it has the highest species richness, an attribute that decreases towards the windward zone. The Enmedio reef is considered important in species diversity and merits special attention because it includes three species with special protection status (Acropora cervicornis, Acropora palmata y Plexaurella dichotoma) according to Mexican laws.

We report upon eleven species of thecate hydroids collected during a recent scientific expedition to the North Patagonian
Zone between southern Chiloé and Puyuguapi fjord/ Magdalena Island. One species belongs to the family Haleciidae
Hincks, 1868, four to the family Sertulariidae Lamouroux, 1812, and six to the family Campanulariidae Hincks, 1868. Of
them, Halecium cymiforme Allman, 1888 and Symplectoscyphus leloupi El Beshbeeshy, 1991 are redescribed based on
new, fertile material. Sertularella allmani Hartlaub, 1901 is assigned to the synonymy of S. antarctica Hartlaub, 1901.
Campanularia subantarctica Millard, 1971 is considered as a junior synonym of C. lennoxensis Jäderholm, 1903, and
data on both the male and female gonothecae are provided. A variant of Clytia gigantea (Hincks, 1866) with smaller
hydrothecae than usual is described. Sertularella sanmatiasensis El Beshbeeshy, 1991 is recorded from Chile for the first
time. Although not belonging to the present collection, several notes on Kirchenpaueria curvata (Jäderholm, 1904) are
provided.