Person:
Pardos Martínez, Fernando

First Name

Fernando

Last Name

Pardos Martínez

URI

https://hdl.handle.net/20.500.14352/74513

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Biológicas

Department

Biodiversidad, Ecología y Evolución

Area

Zoología

Identifiers

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Now showing 1 - 10 of 20

A new species of the recently established genus Setaphyes (Kinorhyncha, Allomalorhagida) from the Mediterranean with an identification key
(Marine Biodiversity, 2018) Sánchez Santos, Nuria; García-Herrero, Álvaro; García-Gómez, Guillermo; Pardos Martínez, Fernando
A new species of the very recently erected kinorhynch genus Setaphyes is described here using scanning electron microscopy and differential interference contrast microscopy. Specimens of the new species were collected from the Mediterranean coast of Spain. Setaphyes cimarensis sp. nov. is distinguished from other congeners by the presence of unpaired paradorsal setae on segments 2–9, laterodorsal setae on segments 2–9 and ventromedial setae on segments 3–9, combined with the presence of a distinctive cuticular ornamentation at the anterior dorsal margin of segment 1 forming small, round depressions, as well as conspicuous longitudinal cuticular folds on both sides of segment 10. Moreover, the new species has a significantly larger total trunk length compared to its Mediterranean congeners. A key to all known species of Setaphyes is provided. The present contribution brings the total number of kinorhynch species around the Iberian Peninsula to 33.
Meristoderes gen. nov., a new kinorhynch genus, with the description of two new species and their implications for echinoderid phylogeny (Kinorhyncha: Cyclorhagida, Echinoderidae)
(Zoologischer Anzeiger, 2012) Herranz, María; Thormar, Jonas; Benito, Jesús; Pardos Martínez, Fernando; Sánchez Santos, Nuria
A new kinorhynch genus, Meristoderes gen. nov., and two new species from Spain and the Solomon Islands, respectively, are described. The new genus is distinguished from all other genera by the first segment consisting of a closed cuticular ring, and the second segment having partial tergosternal junctions, and a superficial midventral fold. This is a new cuticular configuration that may shed light into the phylogenetic relationships of echinoderid kinorhynchs. Meristoderes macracanthus gen. et sp. nov. from the Mediterranean coast of Spain is recognised by the presence of middorsal spines on segments 4, 6 and 8, ventrolateral tubules on segment 2, lateroventral tubules on segment 5, lateroventral spines on segments 6–9, lateral accessory tubules on segment 8, one pair of laterodorsal tubules on segment 10. Meristoderes galatheae sp. nov. from the Solomon Islands is recognized by having a middorsal spine on segment 4 only, ventrolateral tubules on segment 2, lateroventral tubules on segment 5, lateroventral spines on segments 6–9, lateral accessory tubules on segment 8 and subdorsal tubules on segment 10. Both species have a pattern of paraventral perforation site clusters on segments 3–9, with conspicuously long bracteate hairs from the posteriormost perforations sites on the segments 3–7 and 3–6, respectively. The new genus Meristoderes gen. nov. is included into the family Echinoderidae Bütschli, 1876 and appears closely related with the genera Cephalorhyncha Adrianov, 1999 and Echinoderes Claparède, 1863. The new information it provides is discussed to clarify the internal phylogeny of Echinoderidae. The terminology for cuticular characters in the overlapping area between consecutive segments is also standardized.
A new species and first record of Dracoderes (Kinorhyncha: Allomalorhagida: Dracoderidae) from American waters, with an identification key of the genus
(Zoologischer Anzeiger, 2019) Cepeda Gómez, Diego; Pardos Martínez, Fernando; Sánchez Santos, Nuria
A new species of Dracoderes, Daracoderes spyro sp. nov., is described from Hispaniola Island (Caribbean Sea), and represents the first record of this genus in American waters. The new species is distinguished from its congeners by the presence of lateroventral spines on segments 3e4 and 6e9, lateral accessory spines on segment 5, lateroventral tubes on segments 2, 5 and 10, and laterodorsal tubes on segment 8. Additionally, a dichotomous key to the species level for the genus Dracoderes is included.
A new kinorhynch genus, Mixtophyes (Kinorhyncha: Homalorhagida), from the Guinea Basin deep-sea, with new data on the family Neocentrophyidae
(Helgoland Marine Research, 2014) Sørensen, M.V.; Pardos Martínez, Fernando; Sánchez Santos, Nuria
A new homalorhagid genus and species, Mixtophyes abyssalis gen. et sp. nov., is described from the deep-sea of the Guinea Basin in the Atlantic Ocean. The new genus and species was collected during the R/V Meteor Diva2 M63/2 Cruise, and it is characterized by a trunk with segment 1 consisting of a tergal and a single sternal plate, without any subdivisions or differentiations, segment 2–10 of one tergal and two sternal plates and segment 11 of a tergal and a sternal plate. Lateral terminal spines are present in both sexes. As part of the study of the new taxon, the type material of Neocentrophyes intermedius and N. satyai was re-examined, and new information is provided for both species. Based on the information from Mixtophyes abyssalis gen. et sp. nov. and re-examination of the two Neocentrophyes species, emended diagnoses for Neocentrophyes and Neocentrophyidae are proposed, and an updated identification key to homalorhagid genera and species of Neocentrophyidae is provided. Mixtophyes abyssalis gen. et sp. nov. is tentatively assigned to Neocentrophyidae, but evaluation of our current hypotheses about homalorhagid evolution and phylogeny also indicated that the family most probably is paraphyletic and that revision of homalorhagid classification is required when new results from phylogenetic analyses become available.
Morphology disentangles the systematics of a ubiquitous but elusive meiofaunal group (Kinorhyncha: Pycnophyidae)
(Cladistics, 2016) Sánchez Santos, Nuria; Yamasaki, Hiroshi; Pardos Martínez, Fernando; Sorensen, Martin V.; Martínez, Alejandro
Kinorhyncha is a group of benthic, microscopic animals distributed worldwide in marine sediments. The phylum is divided into two classes, Cyclorhagida and Allomalorhagida, congruent with the two major clades recovered in recent phylogenetic analyses. Allomalorhagida accommodates more than one-third of the described species, most of them assigned to the family Pycnophyidae. All previous phylogenetic analyses of the phylum recovered the two genera within Pycnophyidae, Pycnophyes and Kinorhynchus, as paraphyletic and polyphyletic. A major problem in these studies was the lack of molecular data of most pycnophyids, due to the limited and highly localized distribution of most species, often in the Arctic and the deep-sea. We here overcame the problem by adding a morphological partition with data for 79 Pycnophyidae species, 15 of them also represented by molecular data. Model-based analyses yielded seven clades, which each was supported by several morphological apomorphies. Accordingly, Kinorhynchus is synonymized with Pycnophyes and six new genera are described for the remaining recovered clades: Leiocanthus gen. nov., Cristaphyes gen. nov., Higginsium gen. nov., Krakenella gen. nov., Setaphyes gen. nov. and Fujuriphyes gen. nov.
Four new species of Kinorhyncha from the Gulf of California, eastern Pacific Ocean
(Zoologischer Anzeiger, 2019) Cepeda Gómez, Diego; Alvarez-Castillo, Lucía; Hermoso-Salazar, Margarita; Sánchez Santos, Nuria; Gómez, Samuel; Pardos Martínez, Fernando
Kinorhynch specimens were studied from abyssal sediment samples collected during seven cruises at the Clarion-Clipperton Fracture Zone (Eastern Central Pacific), a vast area that will be mined for polymetallic nodules in a near future. This study is the first in a series focused on kinorhynchs mainly collected at the German zone following requirements of the International Seabed Authority (ISA), who demands identification of fauna associated with nodules previous to the concession of the exploitation license. A total of 18 species were found, of which three new Echinoderidae species are described herein. Cephalorhyncha polunga sp. nov. is easily discriminated from its congeners by the presence of pointed and prominent tergal extensions together with middorsal spines on segments 4–8, ventrolateral tubes on segment 2, lateroventral tubes on segment 5, lateroventral spines on segments 6–9 and midlateral tubes on segment 10; plus subdorsal type 2 glandular cell outlets on segment 2 and midlateral ones on segment 8. Echinoderes shenlong sp. nov. is characterized by middorsal spines on segments 4, 6, 8, lateroventral tubes on segment 5 and lateroventral spines on segments 6–9; glandular cell outlets type 2 are not present. Meristoderes taro sp. nov. is defined by the combination of long middorsal spines on segments 4–8, remarkably increasing in length on posterior segments; short laterodorsal tubes on segment 10, ventrolateral tubes on segment 2 and lateroventral tubes on segment 5, plus lateroventral spines on segments 6–9.
From biggest to smallest mud dragons: size-latitude trends in a group of meiobenthic animals worldwide
(Organisms Diversity and Evolution, 2021) Cepeda Gómez, Diego; Pardos Martínez, Fernando; Sánchez Santos, Nuria
Size-latitude trends in the meiobenthic phylum Kinorhyncha, commonly known as mud dragons, have been explored in oceans worldwide. Generalized least squares regression was used to assess relationships between size and latitude, as well as between size, latitude, and two selected environmental variables that exhibit latitudinal gradation: the sea surface temperature and the net primary productivity. Different structures of spatial autocorrelation and potential confounding factors, such as the species richness and the number of kinorhynch records that could affect latitudinal gradients, were also addressed. In addition, generalized mixed models were used to determine the influence of the phylogeny on body size. Size-latitude relationships of Kinorhyncha were commonly found globally, as well as for particular geographic regions (hemispheres and/or coastlines), with important differences between taxonomic groups. These size-latitude trends were heterogeneous and implied the influence of the latitude itself, environmental variables, and phylogeny. These facts indicate that a single underlying process is not likely to explain the observed relationships but a complex interaction of several macroecological patterns both present and past. Perhaps, the inclusion of future new reports, conducted in undersampled areas, may shed some light on the matter and reveal more generalized size-latitude patterns. Nevertheless, it is also likely that broadly generalizable size-latitude relationships may not exist in meiofaunal communities.
Meiofauna is an important, yet often overlooked, component of biodiversity in the ecosystem formed by Posidonia oceanica
(Invertebrate Biology, 2022) García Gómez, Guillermo; García Herrero, Álvaro; Sánchez Santos, Nuria; Pardos Martínez, Fernando; Izquierdo Muñoz, Andrés; Fontaneto, Diego; Martínez, Alejandro
The ecosystem formed by the marine flowering plant Posidonia oceanicais a biodiversity reservoir and provides many ecosystem services in coastal Mediterraneanregions. Marine meiofauna is also a major component of that biodiversity, and itsstudy can be useful in addressing both theoretical and applied questions in ecology, evolution, and conservation. We review the meiofaunal diversity in the meadow ecosystem of P. oceanica by combining a literature review and a case study. First, wegathered records of 672 species from 71 published studies, as well as unpublishedsources, highlighting 4 species exclusive to this ecosystem. Eighteen of those studiesquantified the spatial and temporal changes in species composition, highlightinghabitat-specific assemblages that fluctuate following the annual changes experiencedby these meadows. Hydrodynamics, habitat complexity, and food availability, all threeinherently linked to the seagrass phenology, are recognized in the literature as themain factors shaping the complex distribution patterns of meiofauna in the meadows.These drivers have been identified mainly in studies of Copepoda and Nematoda,and their effect may depend ultimately on species-specific preferences. Second, wetested the generality of these observations using marine mites as a model group,showing that similar ecological preferences might be found in other less abundant meiofaunal groups. Overall, our study highlights the high diversity of meiofauna inmeadows ofP. oceanicacompared with algae and sessile macrofauna associated withthis seagrass and shows the complexity of the interactions and habitat use bymeiofauna associated with the seagrass.
Deep-sea Kinorhyncha diversity of the polymetallic nodule fields at the Clarion-Clipperton Fracture Zone (CCZ)
(Zoologischer Anzeiger, 2019) Sánchez Santos, Nuria; Pardos Martínez, Fernando; Martínez Arbizu, Pedro
Kinorhynch specimens were studied from abyssal sediment samples collected during seven cruises at the Clarion-Clipperton Fracture Zone (Eastern Central Pacific), a vast area that will be mined for polymetallic nodules in a near future. This study is the first in a series focused on kinorhynchs mainly collected at the German zone following requirements of the International Seabed Authority (ISA), who demands identification of fauna associated with nodules previous to the concession of the exploitation license. A total of 18 species were found, of which three new Echinoderidae species are described herein. Cephalorhyncha polunga sp. nov. is easily discriminated from its congeners by the presence of pointed and prominent tergal extensions together with middorsal spines on segments 4e8, ventrolateral tubes on segment 2, lateroventral tubes on segment 5, lateroventral spines on segments 6e9 and midlateral tubes on segment 10; plus subdorsal type 2 glandular cell outlets on segment 2 and midlateral ones on segment 8. Echinoderes shenlong sp. nov. is characterized by middorsal spines on segments 4, 6, 8, lateroventral tubes on segment 5 and lateroventral spines on segments 6e9; glandular cell outlets type 2 are not present. Meristoderes taro sp. nov. is defined by the combination of long middorsal spines on segments 4e8, remarkably increasing in length on posterior segments; short laterodorsal tubes on segment 10, ventrolateral tubes on segment 2 and lateroventral tubes on segment 5, plus lateroventral spines on segments 6e9.
Two new stygophilic tanaidomorphs (Peracarida, Tanaidacea) from Canary Islands and southeastern Iberian Peninsula
(Marine Biodiversity, 2017) García Herrero, Álvaro; Sánchez Santos, Nuria; García Gómez, Guillermo; Pardos Martínez, Fernando; Martínez, Alejandro
Two new species of stygophilic tanaidomorphs are described from El Hierro (Canary Islands) and the Spanish Mediterranean coast from samples collected both at caves and open marine environments. Both species lack autapomorphies but are described based on their unique combination of characters. Pseudotanais isabelae sp. nov. is characterized by the presence of eyes and forcipate chelas, absence of outer seta in article 2 of maxilliped, absence of tubercles on the endite of the maxilliped, presence of 2–6 blade-like spines on the pereopods and presence of one segment on the endopod of the uropod. Zeuxo bimbache sp. nov. is diagnosed by the presence of three aesthetascs on the terminal article of the antennule, laccinia mobilisnot articulated on the right mandible, wide and crenulated on the left one; basis of the maxilliped with serrated margin, article 1 of the palp without outer seta, anterior process of the coxa naked, unique chaetotaxy of the pleopods, and endopod of the uropod with three articles. These two species represent the first stygophilic members of the genera Pseudotanais and Zeuxo. Araphura brevimanus (Lilljeborg 1864) and Chondrochelia savignyi (Krøyer 1842) are also reported from our cave samples. An updated checklist of all 24 tanaidaceans recorded in caves is provided, with data on their ecological characterization and degree of troglomorphism. The ecological preferences and affinities of all tanaidaceans present in caves is briefly discussed, and compared with those of other peracarids.