Unidad Campeche

To date the occurrence of Mayerella redunca has only been reported from the northern Gulf of Mexico (USA) and southern
Caribbean (Venezuela). Based on samples collected from the continental shelf of Yucatan, this paper provides the first record
of M. redunca from the southern Gulf of Mexico (Mexico), along with its main morphological features

The southeast region of the Gulf of Mexico is considered to be biologically important, because it is a connection and
transition zone between the Caribbean and the Gulf of Mexico, harboring great marine biodiversity. Nevertheless, benthic
amphipods have been poorly studied in the Mexican southeast sector of the Gulf of Mexico with few studies listing
species. The aim of this study is to provide an update checklist of species for the Mexican southeast sector (based on
literature review and records from the present study) as well as a brief zoogeographical analysis for the Gulf of Mexico
amphipod fauna, putting them in context with the fauna on the tropical western Atlantic. Fifty-five species were listed for
the Mexican southeast sector; 36 of them showed a geographical extension to the Yucatan continental shelf representing
23 new records for the Mexican southeast sector, nine for the southeast region and four for the Gulf of Mexico. Based on
the zoogeographical analysis, there is support of the application of Carolinian and Caribbean zoogeographic provinces to
amphipods in the Gulf of Mexico

A new species of the genus Caribboecetes Just, 1983 is described and illustrated from specimens collected on sandy bottoms
of the northern Yucatan Peninsula, southeastern Gulf of Mexico. Caribboecetes progreso sp. nov. differs from the
closely related species Caribboecetes barbadensis Just, 1983 and Caribboecetes jenikarpae Just, 1984 by the inflated triangular
anterolateral flange on basis of gnathopod 2, and from Caribboecetes justi Ortiz & Lemaitre, 1997 by the setose
anterolateral surface of coxal plate 7 and basis of pereopod 7. Ecological notes for the new species, a morphological comparison,
map of distribution and key for all members in the genus are also provided

The present study documents for the first time the occurrence of amphipods in the Alacranes Reef, Gulf of Mexico. Six macrofouling
assemblages were sampled from two types of man-made structures (wood docks and navigation buoys). After sorting
the material, 17 species were identified. An annotated checklist for all species is provided, documenting new records for 11
species (Ampithoe marcuzzii, Apolochus cf. delacaya, Audulla chelifera, Cymadusa compta, Leucothoe cf. wuriti,
Neomegamphopus hiatus, Parhyale hawaiensis, Podocerus fissipes, Quadrimaera prope pacifica, Stenothoe gallensis and
Stenothoe valida)

The discovery of a new melitid amphipod in the Celestun Biosphere Reserve (northern Yucatan peninsula, SE Gulf of
Mexico) is reported. Dulichiella celestun sp. nov. differs from its congeners by an unique set of characteristics: truncated
lateral cephalic lobe, mandibular palp article 1 having inner margin produced distally, carpus longer than the propodus of
gnathopod 1, gnathopod 2 propodus distolateral crown with four spines, pereopods 3–7 dactylar unguis anterior margin
with two accessory spines, and urosomite 3 bearing four dorsal spines. A key to species and zoogeographical affinities
among members of the genus in the western Atlantic are also provided

Tropical coral reefs are known to exhibit high levels of biodiversity. Amphipod crustaceans are successfully adapted to a wide range of marine habitats in coral reefs, but some regions, such as the Campeche Bank in southern Gulf of Mexico, are poorly studied or even unsurveyed for amphipods. To begin to address this paucity of information, the present study records amphipod species from Isla Pérez, an island of the Alacranes Reef National Park, southern Gulf of Mexico. Twenty sites were sampled in the intertidal zone and shallow water
adjacent to the island. Thirty-one species of amphipod were identified, 15 of which represented a geographical range extension to the northern Yucatan Peninsula, with four new records for the Mexican south-east sector of the Gulf of Mexico; nine for the Gulf Coast of Mexico; and two for the entire Gulf of Mexico. Significantly, a difference in faunal composition between windward and leeward areas of the intertidal zone was found

Seventeen species of caprellid amphipods have been recorded so far in the Gulf of Mexico. New distributional and habitat data are included for 12 species. Pseudaeginella biscaynensis has been recorded again in the Gulf of Mexico for the first time since it was originally described 45 years ago. New orphological
information based on the development of Deutella mayeri and a redescription of Metaprotella hummelincki are also provided, along with a key for species identification and zoogeographical comments at the regional and global scales

A new amphipod species of the genus Elasmopus Costa, 1853 is described and illustrated based on material collected in a harbor on the northern Yucatan coast, southern Gulf of Mexico. Elasmopus yucalpeten sp. n. is recognized from its congeners by a two-articulate
accessory flagellum, a group of long robust setae on the anterodistal margin of the gnathopod 2 basis, a distomedial concave portion on palm of gnathopod 2 propodus, long setae on basis posterior margin of pereopods 5–7, and an entire telson. The differences among closely related species are pointed out and they are compared with the new species.
An identification key to species of the genus Elasmopus in the Gulf of Mexico and biogeographic comments at the regional and global scales are also provided

The present study documents for the first time the occurrence of amphipods in the Alacranes Reef, Gulf of Mexico. Six macrofouling
assemblages were sampled from two types of man-made structures (wood docks and navigation buoys). After sorting
the material, 17 species were identified. An annotated checklist for all species is provided, documenting new records for 11
species (Ampithoe marcuzzii, Apolochus cf. delacaya, Audulla chelifera, Cymadusa compta, Leucothoe cf. wuriti,
Neomegamphopus hiatus, Parhyale hawaiensis, Podocerus fissipes, Quadrimaera prope pacifica, Stenothoe gallensis and
Stenothoe valida).