Angel Valdes

Angel Valdes
California State Polytechnic University, Pomona | Cal Poly Pomona · Department of Biological Sciences

Ph.D.

About

270
Publications
112,765
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3,967
Citations
Citations since 2016
68 Research Items
2080 Citations
20162017201820192020202120220100200300
20162017201820192020202120220100200300
20162017201820192020202120220100200300
20162017201820192020202120220100200300
Introduction
Angel Valdes currently works at the Department of Biological Sciences, California State Polytechnic University, Pomona. Angel does research on Evolutionary Biology, Ecology and Systematics (Taxonomy).

Publications

Publications (270)
Article
Full-text available
Specimens of Aplysia punctata inhabiting the Catalonian coast (NE Spain, Western Mediterranean Sea) display two different color patterns, which have been thought to represent two distinct species. However, molecular analyses conducted by other authors and confirmed herein show that there are no genetic differences between individuals of the two col...
Article
The evolutionary relationships of the nudibranch genus Dondice Er. Marcus, 1958, its hypothesized synonym with Nanuca Er. Marcus, 1957, as well as its species-level diversity remain unresolved. Here, in order to assess the systematics of Dondice a molecular phylogenetic analysis based on cytochrome c oxidase I and 16S genes was carried out, includi...
Article
The genus Dendrodoris is ascribed to the family Dendrodorididae, whose members are characterized lacking spicules in the dorsum as well as a radula, one of the most important taxonomic traits to distinguish and define nudibranch species. The absence of this taxonomic character makes difficult to delineate species based on morphologic traits, and co...
Article
Transitions to terrestriality have been associated with major animal radiations including land snails and slugs in Stylommatophora (>20 000 described species), the most successful lineage of ‘pulmonates’ (a non-monophyletic assemblage of air-breathing gastropods). However, phylogenomic studies have failed to robustly resolve relationships among tra...
Article
Conformity of trans-Arctic Coryphellidae genera with the most recent revised taxonomy for the group was tested. Both morphological and molecular data were used to compare more than 200 specimens from various localities in the North Pacific, North Atlantic and Arctic Oceans. The molecular study included four markers (COI, 16S, H3 and 28S) and implem...
Article
In this paper we investigate a collection of Northwest Pacific nudibranch molluscs by means of integrative taxonomy, including morphological analyses, molecular data from the cytochrome c oxidase subunit I, 16S rRNA, histone H3, 28S rRNA, 18S rRNA markers, and ecological data. Two new species, Bathydoris antoni sp. nov. and Dendronotus kurilensis s...
Article
Full-text available
The genus Micromelo (family Aplustridae) occurs in almost all tropical and subtropical waters across the globe, with the exception of the Eastern Pacific. Most authors consider Micromelo undatus (Bruguière, 1792) as the only valid species in this genus. This study examines populations of specimens identified as M. undatus across its geographic rang...
Article
Full-text available
The activation of C . elegans spermatids to crawling spermatozoa is affected by a number of genes including spe-47 . Here, we investigate a paralog to spe-47 : spe-50 , which has a highly conserved sequence and expression, but which is not functionally redundant to spe-47 . Phylogenetic analysis indicates that the duplication event that produced th...
Article
The North Pacific nudibranch species Triopha catalinae (Cooper, 1863), also known as the clown nudibranch, includes two distinct morphotypes: the trans-Pacific morphotype, known from South Korea to Southern California, and the eastern Pacific-only morphotype from Southeast Alaska to Baja California. We tested the hypothesis that Triopha catalinae i...
Article
Full-text available
The ragged sea hare (Bursatella leachii) and the long-tailed sea hare (Stylocheilus striatus) are two widely distributed species of benthic heterobranch sea slugs. In this paper, integrative taxonomic analyses have been conducted to detect possible cryptic diversity. Our results revealed that both nominal species are actually species complexes, con...
Article
Full-text available
Berthella californica (W. H. Dall, 1900) is a widespread species of heterobranch sea slug distributed across the North Pacific Ocean, from Korea and Japan to the Galapagos Islands. Two distinct morphotypes are observed in B. californica, which differ in external coloration, egg-mass morphology and geographic distribution (with the exception of a sm...
Preprint
Full-text available
The activation of C. elegans spermatids to crawling spermatozoa is affected by a number of genes including spe-47 . Here, we investigate a paralog to spe-47 : spe-50 , which has a highly conserved sequence and expression, but which is not functionally redundant to spe-47 . Phylogenetic analysis indicates that the duplication event that produced the...
Article
Molecular and morphological evidence support the view that the widely distributed species Berthella stellata (Risso, 1826) is a species complex of at least eight different species. The closely related species Berthella plumula (Montagu, 1803), examined for comparison, is also a complex of two species; the name B. plumula is retained for the Atlanti...
Article
The widespread sea hare species Aplysia parvula includes four genetically distinct lineages, containing a total of ten different species. While the four lineages can be differentiated by their external characteristics, species in each clade are often morphologically indistinguishable. A review of literature and type material revealed that several a...
Article
Full-text available
The widespread sea hare species Aplysia parvula includes four genetically distinct lineages, containing a total of ten different species. While the four lineages can be differentiated by their external characteristics, species in each clade are often morphologically indistinguishable. A review of literature and type material revealed that several a...
Article
Full-text available
Phidiana hiltoni is a conspicuous nudibranch sea slug native to the northeastern Pacific Ocean. Over the past thirty years the range of P. hiltoni has expanded about 200 km northward, but the mechanism that facilitated this expansion is poorly understood. In this study, we use mtDNA and microsatellite data to investigate the population structure of...
Article
A compendium of the northeast Pacific benthic shelled sea slugs formerly classified in the paraphyletic group "Opisthobranchia" is provided. These include organisms with internal and/or reduced shells. Shell-less groups such as Nudibranchia or closely related benthic shelled clades such as the Pyramidelloidea and the Siphonarioidea are excluded. Th...
Article
Full-text available
Increased exploration of northeastern Pacific deep-sea habitats has revealed a diverse and often poorly-known invertebrate community, including a number of undescribed species of nudibranchs studied herein. We used morphology to distinguish several new species from their congeners, and generated data where possible for mitochondrial (COI, 16S) and...
Article
Full-text available
The sea hare Bursatella leachii (de Blainville 1817) (Mollusca: Gastropoda: Heterobranchia: Aplysiidae) is a pantropi‑cal sea slug that has colonized the Mediterranean Sea in modern times. Because the initial records in the non‑native range started in the Eastern Mediterranean, and its pattern of spread was relatively consistent with those observed...
Article
“Cryptic” can refer to species that match their background through camouflage or disruptive colouration, or in taxonomy to externally similar but unrecognized congeners. In adaptive resemblance, organisms resemble parts of a larger host animal or plant on which the mimic is highly cryptic. Mimetic lineages that radiate onto superficially similar ho...
Article
Molecular and morphological data from newly collected specimens and a review of the literature and type material indicate that the widespread tropical sea hare Dolabrifera dolabrifera is a species complex of five genetically distinct taxa. The name Dolabrifera dolabrifera is retained for a widespread species in the Indo-Pacific tropics. Dolabrifera...
Article
Polybranchia Pease, 1860 is a tropical and subtropical genus of sacoglossan heterobranch sea slugs. Eight nominal species of Polybranchia have been described; however, the taxonomic status of most species is uncertain. Here, we present an integrative assessment of species diversity in Polybranchia. Two methods of molecular species delimitation supp...
Article
Polybranchia Pease, 1860 is a tropical and subtropical genus of sacoglossan heterobranch sea slugs. Eight nominal species of Polybranchia have been described; however, the taxonomic status of most species is uncertain. Here, we present an integrative assessment of species diversity in Polybranchia. Two methods of molecular species delimitation supp...
Article
Full-text available
The mollusc nudibranch genus Hermissenda Bergh, 1879 was recently discovered to include three pseudocryptic species, dividing a single species H. crassicornis (sensu lato) into H. crassicornis Escholtz, 1831, H. opalescens J.G. Cooper, 1863, and H. emurai Baba, 1937. The species were distinguished by both genetic and morphological evidence, and the...
Article
Predicting biotic resistance to highly invasive strains of "killer algae" (Caulerpa spp.) requires understanding the diversity and feeding preferences of native consumers, including sea slugs in family Oxynoidae. Past studies reported low algal host specificity for Oxynoe (6 spp.) and Lobiger (4 spp.), but these taxonomically challenging slugs may...
Article
An integrative approach to investigate the species-level diversity in Oxynoe (Mollusca, Heterobranchia, Sacoglossa) revealed the existence of 11 distinct taxa. Oxynoe viridis (Pease, 1861) and Oxynoe antillarum Mörch, 1863 are redescribed Oxynoe natalensis E. A. Smith, 1903 and Oxynoe azuropunctata Jensen, 1980 are regarded as valid. Species origin...
Article
Full-text available
Background The impact of predator-prey interactions on the evolution of many marine invertebrates is poorly understood. Since barriers to genetic exchange are less obvious in the marine realm than in terrestrial or freshwater systems, non-allopatric divergence may play a fundamental role in the generation of biodiversity. In this context, shifts be...
Article
Full-text available
Molecular and morphological data from newly collected specimens and a review of the literature and type material indicate that the widespread tropical sea hare Dolabrifera dolabrifera is a species complex of five genetically distinct taxa. The name Dolabrifera dolabrifera is retained for a widespread species in the Indo-Pacific tropics. Dolabrifera...
Article
Placida cremoniana (Trinchese, 1892) is a sacoglossan heterobranch sea slug of striking coloration, with a reported range that has increased dramatically in recent years. Described from the Mediterranean in 1892, nominal conspecifics were reported from Japan in 1959, and since the 1990s, additional populations have been reported from across the tro...
Article
A combination of molecular, biogeographic and morphological data indicates that the eastern Pacific species Felimare ghiselini is a synonym of F. californiensis, also recorded from this region. However, a disjunct population from Peru, previously considered to be F. ghiselini, represents a distinct species, formally described herein as F. sechurana...
Article
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Morphological examination and molecular analyses of specimens of the genus Limacia collected in the Eastern Pacific Ocean indicate that four species of Limacia occur in the region. Limacia cockerelli, previously considered to range from Alaska to Baja California, is common only in the northern part of its former range. An undescribed pseudocryptic...
Article
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The bubble snail Haminoea orteai Talavera, Murillo & Templado, 1987 has been reported from several localities in the Mediterranean and northeastern Atlantic. Although H. orteai can be easily recognized by having pigmented periocular areas, difficulties in the systematics of haminoeids hampered reliable identification of specimens. In addition, the...
Article
Full-text available
A new species of Parvaplustrum from the northeastern Pacific, recognized in the literature as undescrihed, is formally named herein. This new species is morphologically distinct from the two other species in the genus, Parvnphistnnn tenenim and P. japonicum, and distinguishable by its shell sculpture. The new species is found from Oregon to Baja Ca...
Article
Full-text available
The black-ringed Aplysia was reported in Indian taxonomic records as Aplysia dactylomela Rang, 1828. This paper confirms that the Indian species records of A. dactylomela represents Aplysia argus Rüppell & Leuckart, 1830, based on morpho-molecular approach.
Article
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A new species of Melanochlamys is described based on specimens collected in Russia and Korea. This new species is genetically and anatomically different from other North Pacific species. Phylogenetic analyses of two mitochondrial (COI, 16S) and a nuclear (H3) gene confi rmed the results of previous analyses and recovered a clade including specimens...
Article
Full-text available
Nudibranch molluscs of the genus Dendronotus Alder and Hancock, 1845 are widely distributed in the Northern Hemisphere. Taxonomic studies on the genus Dendronotus have been problematic due to high variability in colour pattern in many species, as well as in external morphology and anatomy. In the present paper, we studied specimens of Dendronotus f...
Article
Full-text available
Molecular and morphological evidence indicates that the widespread North Pacific species Diaulula sandie-gensis is a complex of two pseudocryptic species. One ranges from the Sea of Japan to northern California, whereas the other is found from northern California to Baja California. The name Diaulula sandiegensis applies to the southern species and...
Article
The genus Berthellina Gardiner 1936 (Mollusca: Heterobranchia: Nudipleura) is a circumtropical group of pleurobranchid sea slugs including species with uniform coloration patterns, varying from yellow and orange to red. The systematics of Berthellina is in need of a revision for many areas of the world, particularly in the Indo-West Pacific region,...
Article
Full-text available
The Caribbean is a biodiversity hotspot for photosynthetic sea slugs, with about 27 described species in the genus Elysia Risso, 1818. However, many species are poorly known or have complex taxonomic histories, complicating assessments of regional biodiversity and impeding studies of plastid symbiosis, speciation, and larval biology. Using an integ...
Article
Full-text available
Based on morphological data a total of nine native species of Philinidae are recognized from the northeastern Pacific in-cluding the Bering Sea and the adjacent Arctic Ocean (Beaufort Sea). Four of them have been previously described: Phi-line ornatissima Yokoyama, 1927, Philine bakeri Dall, 1919, Philine polystrigma (Dall, 1908), and Philine hemph...
Article
Full-text available
Background: The Bocas del Toro Archipelago is located off the Caribbean coast of Panama. Until now, only 19 species of heterobranch sea slugs have been formally reported from this area; this number constitutes a fraction of total diversity in the Caribbean region. Results: Based on newly conducted fieldwork, we increase the number of recorded hete...
Article
Full-text available
The sea slug referred to as Placida dendritica (Alder et Hancock, 1843) distributed in the Sea of Japan (East Sea), Yellow Sea, and adjacent waters of the Pacific has been confirmed as distinct species from P. dendritica. Cytochrome c oxydase subunit I and 16S rRNA genes sequence data were used for species delimitation using either a tree method or...
Article
Full-text available
Tergipedid nudibranch specimens from the Caribbean Sea previously identified as Cuthona caerulea are here described as a new species. Sequence data for the mitochondrial CO1 and 16S genes as well as the nuclear H3 are provided. A preliminary molecular phylogeny including other Cuthona species available in GenBank produced inconclusive results, but...
Article
Full-text available
The coast of northern Chile has been sparsely studied in regards to its invertebrate fauna, with just a few works reviewing the distribution of local mollusks. This work presents a survey of the shallow water heterobranch sea slugs currently occurring around the port of Caldera (27 °S), in the Región de Atacama, northern Chile. Eight species of sea...
Data
Abstract in spanish. Resumen en Español.
Article
Full-text available
Hermissenda crassicornis is a model organism used in various fields of research including neurology, ecology, pharmacology, and toxicology. In order to investigate the systematics of this species and the presence of cryptic species in H. crassicornis, we conducted a comprehensive molecular and morphological analysis of this species covering its ent...
Article
The examination of a collection of nudibranchs (Mollusca: Gastropoda: Heterobranchia) obtained during several expeditions to international waters off Newfoundland, North Atlantic, revealed the presence of rare species, new records for the area, and an undescribed species of Tritonia (described herein). This includes the first record of Dendronotus...
Article
Full-text available
The phylogenetic position of the polar nudibranch genus Doridoxa within Nudibranchia is controversial. Because Doridoxa is only found in polar deep waters specimens available for research are scarce. Additionally, Doridoxa possesses a mixture of morphological traits that are present in the two major lineages of nudibranchs (dorids and cladobranchs)...
Article
Full-text available
Scaphander interruptus Dall, 1890 is a widespread, deep-water eastern Pacific species whose range is extended to California. The anatomical features of this species are similar to those of other members of Scaphander de Monfort, 1810, including the presence of a single lateral tooth on each half-row of the radula and the morphology of the penial co...