Two new species of Monstrilla (Copepoda: Monstrilloida) from Brazil (original) (raw)
Related papers
Diversity, 2021
Monstrilloid copepods are protelean parasites with a complex life cycle that includes an endoparasitic juvenile phase and free-living early naupliar and adult phases. The monstrilloid copepod genus Caromiobenella Jeon, Lee and Soh, 2018 is known to contain nine species, each one with a limited distribution; except for two species, members of this widespread genus are known exclusively from males. Hitherto, members of Caromiobenella have not been recorded from tropical waters of the South Western Atlantic (SWA). The nominal species Monstrilla brasiliensis Dias and Suárez-Morales, 2000 was originally described from female specimens collected in coastal waters of Espírito Santo and Rio de Janeiro (Brazil), but the male remained unknown. The failure to reliably link both sexes of monstrilloid species is one of the main problems in the current taxonomy of the group, thus leading to a separate treatment for each sex. New zooplankton collections in coastal waters and intertidal rocky pools of the SWA yielded several male and female monstrilloid copepods tentatively identified as Monstrilla brasiliensis. Our results of both morphologic and molecular (mtCOI) analyses allowed us to confirm that these males and females were conspecific. We also found evidence suggesting that Caromiobenella is not a monophyletic taxon. Our male specimens are morphologically assignable to Caromiobenella, therefore, females of the nominal species Monstrilla brasiliensis, are matched here with the aforementioned males and, thus, the species should be known as C. brasiliensis comb. nov. (Dias and Suárez-Morales, 2000). This finding represents the third documented discovery of a female of Caromiobenella, the first record of the genus in the Southwestern Atlantic, and the first documented record of monstrilloids from coastal tidepools. With the addition of C. brasiliensis, Caromiobenella now includes 10 valid species worldwide. This work represents the second successful use of molecular methods to link both sexes of a monstrilloid copepod. The male of C. brasiliensis is here in described, and a key to the known species of Caromiobenella and data on the habitat and local abundance of C. brasiliensis are also provided.
Zoologischer Anzeiger - A Journal of Comparative Zoology, 2006
In the course of a comparative analysis of the species included in the copepod genus Monstrillopsis Sars, a new species of the genus was discovered. The new species, Monstrillopsis chilensis n. sp., was found in a plankton sample collected in coastal waters off central Chile in the Southeastern Pacific. The adult female is similar to females of the type species M. dubia Scott and related forms but differs from its congeners by a combination of characters including: (1) a pair of small cephalic processes present between bases of antennules; (2) deep corrugations present on proximolateral surface of fifth pedigerous somite; (3) exopodal lobe of fifth leg not distally elongated; and (4) endopodal lobe of fifth legs short. This is the first record of the genus in the Southeastern Pacific and the second record of any monstrilloid in Chile. A comparative analysis of the species assigned to Monstrillopsis allowed a clarification of the generic characters and limits. The most important apomorphic characters in the genus are the presence of four caudal setae and modifications of the male antennule; other potentially useful characters are the pattern of antennule segmentation and the uniform presence of a reduced inner lobe of the fifth leg. The female of Monstrilla reticulata Davis should be retained in Monstrilla, but the purportedly conspecific male is probably a Monstrillopsis. Monstrillopsis ciqroi Sua´rez-Morales and M. angustipes Isaac should be transferred to Monstrilla. Haemocera filogranarum Malaquin is probably a species of Monstrillopsis. Monstrillopsis zernowi is tentatively retained in this genus as an aberrant form. A key for the identification of the species of this genus is included.
A New Species of Monstrilla (Copepoda, Monstrilloida) From the Mexican Coasts of the Caribbean Sea
Crustaceana, 1992
The genus Monstrilla Dana, 1849 is the most diverse of the copepod order Monstrilloida. Monstrilloid copepods are endoparasites of benthic polychaetes and molluscs; adult individuals are free-living, nonfeeding reproductive forms that briefly become part of the zooplankton community, where they are occasionally captured by plankton nets. Monstrilloid copepods are frequently found during routine plankton samplings of coastal and estuarine habitats, but they are rarely found in large numbers. The western sector of the Caribbean Sea is known to harbor a diverse monstrilloid fauna. The analysis of zooplankton samples obtained during nine years from Chetumal Bay, a large embayment of the Mexican Caribbean coast, yielded a male monstrilloid that was found to represent a new species. It is herein described following upgraded standards and compared with its congeners. A key to males and females of the Monstrilla species known from the northwestern Caribbean is also provided.
Journal of Natural History, 2005
Two new species of harpacticoid copepods, Cletocamptus levis sp. nov. and Cletocamptus nudus sp. nov. are described from Brazil. Cletocamptus nudus sp. nov. seems to be closely related to C. schmidti based on the armature formula of mouth parts, P3 and P4, but can be separated based on the ornamentation of the anal operculum, relative length of exopodal and baseoendopodal setae of the female P5, and length ratio of the female P1 EXP:ENP. Cletocamptus levis sp. nov. seems to be more closely related to C. axi by the combination of a P1 ENP shorter than the P1 EXP, the armature formula of the mandibular palp, length: width ratio of caudal rami, and relative length of the female P3 ENP 2, male P2-P4 EXP 1, and number of segments of the male P3 ENP. It can be separated by the spinule ornamentation on the anal operculum, shape of female rostrum, relative length of outer spinules of female P2-P4 EXP, relative length of the setae on the male P5 EXP, armature of male P6, and by the dimorphic male rostrum of C. levis sp. nov. which is similar to that observed for C. retrogressus and C. albuquerquensis. Additionally, a fully illustrated record of the Mexican C. sinaloensis is reported for the first time from Brazilian waters, and C. affinis mongolicus Stěrba, 1968 is given full species status.
Study of Monstrilloida distribution (Crustacea, Copepoda) in the Southwest Atlantic
The Monstrilloida is one of the least known orders of planktonic Copepoda. Taxonomic and ecological work on the group has been limited by the rarity of specimens, which occur in plankton only as adults. The material examined was collected during zooplankton surveys in neritic and oceanic areas off the coast of Brazil. Sampling was carried out between April 1984 and October 1999. Data from collections made off the coast of Argentina were also analysed. Fifteen monstrilloid species: Monstrilla brasiliensis, M. grandis, M. helgolandica, M. rugosa, M. careli, M. pustulata, M. satchmoi, M. bahiana, Cymbasoma cf. longispinosum, C. quadridens, C. cf. rigidum, C. rochai, C. gracilis, Monstrillopsis dubia and M. fosshageni are reported herein for the Southwest Atlantic (5-50° S). The species groups were associated with three areas, each with different conditions of temperature and salinity. The tropical species association occurred off the northeast Brazilian coast with temperatures ranging from 20.5 to 29.1 ºC and salinities from 35.6 to 37.5, indicating the presence of the Shelf and Tropical Waters in the region. The subtropical species association occurred off the central coast with temperatures between 21.0 and 29.6 ºC and a salinity range of 27.5-35.8, and is related to the coastal and shelf waters. A subantarctic species association occurred off the coast of Argentina, with temperatures between 12.3 and 19 ºC and a salinity range of 33.0-34.0. Resumo. Estudo da distribuição de Monstrilloida (Crustacea, Copepoda) do Atlântico Sudoeste. Monstrilloida é uma das ordens menos conhecidas dos Copepoda planctônicos. Estudos taxonômicos e ecológicos são limitados pela escassez dos espécimes, que ocorrem no plâncton somente como adultos. O material foi coletado durante amostragens de zooplâncton em áreas neríticas e oceânicas na costa de Brasil. As coletas foram realizadas entre abril de 1984 e outubro de 1999. Dados de materiais coletados na costa de Argentina também foram analisados. Quinze espécies de Monstrilloida: Monstrilla brasiliensis, M. grandis, M. helgolandica, M. rugosa, M. careli, M. pustulata, M. satchmoi, M. bahiana, Cymbasoma cf. longispinosum, C. quadridens, C. cf. rigidum, C. rochai, C. gracilis, Monstrillopsis dubia e M. fosshageni foram registradas para o Atlântico Sudoeste (5-50° S).
Zoological Journal of the Linnean Society, 2008
Maemonstrilla gen. nov., known exclusively from females, is proposed for Monstrilla longipes A. Scott, 1909, M. turgida A. Scott, 1909, and five new species from coral reef plankton in the Ryukyu Islands, Japan: Maemonstrilla hyottoko sp. nov. (type species), M. polka sp. nov., M. spinicoxa sp. nov., M. simplex sp. nov. and M. okame sp. nov. A syntype of M. turgida was examined, but the holotype of M. longipes is lost; the latter species, being similar to several of the new species, is regarded as unidentifiable, and the identity of specimens assigned to it by several authors is put in doubt. Until now, all known female monstrilloids have had posteriorly trailing ovigerous spines, but in Maemonstrilla gen. nov. these spines point anteriorly and hold the egg mass between the legs beneath the thorax. This is the first known instance of subthoracic brooding in a planktonic copepod; its functional significance is discussed, and brooding habits of non-planktonic copepods are briefly reviewed. The intercoxal sclerites of legs 1-4 in Maemonstrilla gen. nov. are very wide, making room for the eggs. In all species except M. turgida comb. nov., the inner seta of the proximal segment of each leg ramus is either absent or reduced to a nub; this may lessen interference of the egg mass with leg movement. All species have a uniramous leg 5 with two setae, except M. turgida comb. nov. (biramous with setae on both rami); M. turgida comb. nov. is evidently the sister-group of its congeners, each sister-group in the genus being defined by additional autapomorphies. Scanning electron micrographs of all the Ryukyuan species except M. simplex sp. nov. are provided; these constitute a preliminary survey of monstrilloid integumental organs and cuticular ornamentation. Among the unusual features are two lobes at the base of the coxa in legs 1-4 of M. polka sp. nov. and M. spinicoxa sp. nov. and two pairs of posterodorsal spine-like scales on the first and second free pedigers of M. turgida comb. nov. Newly hatched nauplii of M. okame sp. nov., examined by scanning electron microscopy, are generally similar to those of Monstrilla hamatapex Grygier & Ohtsuka, 1995, but with a different mandibular structure in which the distal hook and seta clearly represent the endopod, not enditic armament of the basis.
ZooKeys, 2009
A new genus of Ectinosomatidae (Copepoda, Harpacticoida) from sublittoral sediments in Ubatuba, São Paulo State (Brazil), an updated key to genera and notes on Noodtiella Wells, 1965 Citation: Kihara TC, Huys R (2009) A new genus of Ectinosomatidae (Copepoda, Harpacticoida) from sublittoral sediments in Ubatuba, São Paulo State (Brazil), an updated key to genera and notes on Noodtiella Wells, 1965. ZooKeys Abstract Both sexes of a new genus and species of Ectinosomatidae (Copepoda, Harpacticoida) from sublittoral sediments collected on the inner continental shelf in Ubatuba, São Paulo State (Brazil) are described in detail. Chaulionyx gen. n. (type species: C. paivacarvalhoi sp. n.) diff ers from all known genera in the presence of a conspicuous bifi d spine on the prehensile P1 endopod. It can be diff erentiated from other genera with a prehensile endopod (Halophytophilus Brian, 1919; Bradyellopsis Brian, 1925; Klieosoma Hicks & Schriever, 1985) by the presence of distinctive subrectangular middorsal pores on the urosomites and the unarmed male sixth legs. Th e genus Lineosoma Wells, 1965 is recognized as a paraphyletic taxon and relegated to a junior subjective synonym of Noodtiella Wells, 1965. Arenosetella pectinata Chappuis, 1954a is removed from its fl oating position in Ectinosomoides Nicholls, 1945, transferred to the genus Noodtiella as N. pectinata comb. n. and considered the senior subjective synonym of N. toukae Mitwally & Montagna, 2001. Dichotomous keys are provided for the identifi cation of the 18 valid species of Noodtiella and the 21 valid genera of the family Ectinosomatidae. Halophytophilus aberrans Wells & Rao, 1987 is placed species incertae sedis in the family.
Nauplius, 2021
Santaremicaris gen. nov. is proposed to accommodate Santaremicaris amazonensis sp. nov., a new species collected by Noodt from the hyporheic zone of the Amazonas River at Santarém, Brazil, and Parastenocaris santaremensis Noodt, 1963, which is redescribed and designated as the type species of the new genus. The new genus is recorded also from several localities of the Amazonian hydrographic basin. Santaremicaris gen. nov. is well supported by clear autapomorphies, e.g., 1) the absence of distal spinules on the endopod of the second swimming leg of the male, which is ornamented with strong outer spinules along the first 2/3 of the segment and armed with a long distal seta the insertion area of which covers almost the whole width of the segment; 2) the presence of a triangular, short and strongly sclerotized endopod on the fourth swimming leg of the male; and 3) the presence of a long and slim male fifth leg ending in a long distal spiniform process, with irregular margins, armed with only three setigerous