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The riffle beetle genus Sinonychus Jäch & Boukal, 1995 (Elminae, Macronychini) includes only three species from East Asia. In this paper, two new species, S.lipinae sp. nov. and S.luodianensis sp. nov., are described from Guizhou Province, China. Illustrations of the new species and a key to all five Sinonychus species are also provided.

The methane seeps on the Pacific margin of Costa Rica support extensive animal diversity and offer insights into deep-sea biogeography. During five expeditions between 2009 and 2019, we conducted intensive faunal sampling via 63 submersible dives to 11 localities at depths of 300-3600 m. Based on these expeditions and published literature, we compiled voucher specimens, images, and 274 newly published DNA sequences to present a taxonomic inventory of macrofaunal and megafaunal diversity with a focus on invertebrates. In total 488 morphospecies were identified, representing the highest number of distinct morphospecies published from a single seep or vent region to date. Of these, 131 are described species, at least 58 are undescribed species, and the remainder include some degree of taxonomic uncertainty, likely representing additional undescribed species. Of the described species, 38 are known only from the Costa Rica seeps and their vicinity. Fifteen range extensions are also reported for species known from Mexico, the Galápagos seamounts, Chile, and the western Pacific; as well as 16 new depth records and three new seep records for species known to occur at vents or organic falls. No single evolutionary narrative explains the patterns of biodiversity at these seeps, as even morphologically indistinguishable species can show different biogeographic affinities, biogeographic ranges, or depth ranges. The value of careful molecular taxonomy and comprehensive specimen-based regional inventories is emphasized for biodiversity research and monitoring.

Pseudosteringophorusprofundis sp. nov. a new species of deep-sea digenean, parasitizing the gallbladder of the "Bigeye grenadier" (Macrourusholotrachys Günther, 1878) in the deep waters of the southeastern Pacific Ocean is described on the basis of morphological and molecular (28S rRNA) data. The new species is distinguishable from Pseudosteringophorushoplognathi Yamaguti, 1940, the only other member of the genus, by its subterminal oral sucker, the position of the ovary and testes, the larger anterior seminal vesicle compared to the posterior one, and its larger eggs. In addition, the new species is a parasite of a deep-sea fish, whereas P.hoplognathi is a parasite of shallow-water fish. A phylogenetic tree, based on 28S rDNA sequences, indicates that this species is included in a clade of deep-sea fellodistomid species (Steringophorus spp.). We provide the first molecular data on the genus Pseudosteringophorus Yamaguti, 1940 and expand the molecular database for the family Fellodistomidae. Further studies, including sequences from other fellodistomid taxa, are needed to more precisely infer relationships within this family.

Solenogastres is a group of mollusks with evolutionary and ecological importance. Nevertheless, their diversity is underestimated and knowledge about the distribution of the approximately 300 formally described species is limited. Factors that contribute to this include their small size and frequent misidentification by non-specialists. Recent deep-sea explorations have resulted in the collection of numerous specimens through effective methods such as epibenthic sledges. However, this is a costly, labor-intensive, and destructive methodology. In contrast, Autonomous Reef Monitoring Structures (ARMS) offer a novel, non-destructive approach, by providing a substrate for benthic organism colonization. This study is the first to describe Solenogastres collected using ARMS, demonstrating that they are an effective tool for biodiversity assessment and characterizing rare marine invertebrates. Following an integrative taxonomic approach, two new solenogaster species are described: Dondersiatweedtae Farris, Olson & Kocot, sp. nov. (Dondersiidae) and Eleutheromeniabullescens Cobo, sp. nov. (Pruvotinidae). The diagnosis of the family Dondersiidae is amended and the necessity of reassessing the validity of the current diagnostic characters for Pruvotinidae, and its classification is emphasized. The two newly described species exhibit distinct external characteristics; D.tweedtae sp. nov. has a striking pink color with a bright yellow dorsal keel and E.bullescens sp. nov. has a unique, discontinuous dorsal keel with nearly spherical protrusions. The presence of cnidocytes in the digestive systems of both species indicate that they feed on cnidarians. It is hypothesized that, like in some nudibranchs, their coloration and body features reflect defensive adaptations related to their diet. This study shows that while habitus alone is typically insufficient for accurate identification in solenogasters, it can sometimes simplify the process. For this, live observations and photographs are essential.

Flies belonging to the families Streblidae and Nycteribiidae are highly specialized arthropods that feed on the blood of bats. Their morphology varies and has adapted throughout their coevolutionary history with hosts. Bat flies are often associated with specific bat species and can establish distinct infracommunities. Interaction networks have been used to better understand these associations, revealing interaction modules between bats and their parasites. The Magdalena River basin is the largest in Colombia, encompassing a wide variety of climatic and ecological conditions, with up to 98 bat species reported. We conducted field trips to capture bats and bat flies in different locations along the basin and reviewed literature records and biological collections to gather additional data on interactions between bats and bat flies in this region. We found a high diversity of bats and bat flies in the Magdalena River basin, revealing a medium specialization and modularity in these interactions. We identified bat fly infracommunities and negative associations between certain bat fly species, suggesting competition for resources within hosts. The specialization is similar to that reported in degraded and fragmented habitats where the availability of shelters decreases, favoring the overcrowding of bats, forming multi-species colonies. In conclusion, our study provides important information on the interactions between bats and bat flies in the Magdalena River basin, expanding knowledge about the diversity and structure of these communities in inter-Andean landscapes.

Three new species of the genus Atkinsoniella (Hemiptera: Cicadellidae: Cicadellinae), A.chongqingana Jiang & Yang, A.likuni Jiang & Yang and A.biostiolum Jiang & Yang, sp. nov., collected from southwestern China, are described and illustrated. The two new species, A.chongqingana Jiang & Yang, sp. nov. and A.likuni Jiang & Yang, sp. nov., are similar to A.nigrominiatula (Jacobi, 1944), A.latior Young, 1986, A.limba Kuoh, 1991, A.dormana Li, 1992, A.divaricata Yang, Meng & Li, 2017, A.peaka Yang, Meng & Li, 2017, and A.zizhongi Jiang & Yang, 2022 in appearances, but can be distinguished from these species by the characteristic of aedeagus, paraphysis, and pygofer. Atkinsonellabiostiolum Jiang & Yang, sp. nov. can be distinguished from all the known Atkinsoniella species by its special color and markings, as well as males having one ostiole in the center of the base of each subgenital plate. A key to Atkinsoniella species from China is provided.

In the present study, the rare true bug Bannacorishyalinus (Schaefer & Ashlock, 1970), comb. nov. (Hemiptera, Heteroptera, Pentatomomorpha, Pentatomoidea, Saileriolidae), which is endemic to Vietnam, is redescribed and transferred from the genus Saileriola China & Slater, 1956 to the genus Bannacoris Hsiao, 1964 based on morphological characteristics. Adults and nymphs of this species congregate in groups of several individuals and suck sap from the abaxial side of the leaves of Litsea sp. (Lauraceae). They cause visible feeding damage on the adaxial side of Litsea leaves, similar to that caused by members of the heteropteran family Tingidae Laporte, 1832 (Cimicomorpha, Miroidea). The new knowledge of B.hyalinus comb. nov. also represents the first formal record of the feeding habits of Saileriolidae China & Slater, 1956. An identification key to all four species of this family is provided.

Seamounts are biodiversity hotspots that face increasing threats from anthropogenic activities. Seamounts host diverse sessile suspension-feeding organisms such as sponges and anthozoans, which are crucial for seamount ecosystems as they construct three-dimensional habitats utilized by numerous other animals. Therefore, accurate identification of seamount fauna, in particular of sessile suspension-feeding organisms, is of paramount importance for robust conservation efforts. This study focused on Zoantharia, a sessile anthozoan group, and specifically the family Parazoanthidae, known for associations with many different host taxa, prominently including octocorals and sponges. We collected Parazoanthidae specimens from northwestern Pacific seamounts and formally describe a new species, Vitrumanthusflosculus Kise & Reimer, sp. nov., based on morphological and molecular analyses. We also report the complete mitochondrial genomes of this new species and the related species Churabanakuroshioae. Our results reconfirm the phylogenetic positions of these two species within Parazoanthidae, while demonstrating much remains to be learned about the benthic diversity of northwestern Pacific seamounts.

The relationship of Xylomoiastrix Mikkola, 1980; Xylomoiaretinax Mikkola, 1998; and Xylomoiastangelmaieri Mikkola, 1998 is reconsidered based on 59 genitalia slides (37 males and 22 females) and 40 barcodes of adults collected from the type localities and areas in-between. Due to lack of stable morphologic differences, apart from the wing coloration of X.retinax, and low genetic distance between the three, they are considered as three subspecies of X.strix: the nominotypical one X.strixstangelmaieri stat. nov. and X.strixretinax stat. nov. Included are photographs of all specimens covering 37 adults, and 28 male and 18 female genitalia, as well as a phylogenetic tree and a map showing collecting localities.

A new species of the family Calliopiidae was collected from the East Sea of Korea. Calliopiusulleungensis sp. nov. is similar to C.columbianus Bousfield & Hendrycks, 1997 in having numerous calceoli on the posteromedial margins of antennae and a weakly carinate body. However, the new species can be distinguished from C.columbianus by the shorter process on peduncular article 3 of antenna 1, subrectangular eyes, and fewer articles in the antenna flagellum. This species, along with C.ezoensisShimoji et al. 2020, occurs in the Western Pacific. The females of the two species are morphologically very similar, but the males of C.ezoensis are easily distinguishable, as the gnathopod 1 is larger than gnathopod 2. The new species is fully illustrated and extensively compared with related species. In this paper, both Calliopius and Calliopiidae are reported from Korea for the first time. A key to species of Calliopius is also provided.