Figure 3 - uploaded by Jaime Jardim
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Acanthochitona terezae (specimen sampled from Bahia state): a dorsal view of head valve, scale 100µm; b intermediate valve (valve V), scale 100µm; c dorsal view of tail valve, scale100µm; d dorsal side of girdle, scale 10µm; e pattern of formation of the sculpture (valve VIII), scale 10µm, f pattern of the sculpture well developed (intermediate valve), scale 10µm, g radula, dorsal view, scale 10µm, h radular central tooth oblique view from right side, scale 10µm. (add clear, close up image of minute spicules of the girdle).
Source publication
Acanthochitona terezae Guerra-Junior, 1983 was described based on 18 specimens collected at the intertidal zone of Bahia state, off ltapuã, NE Brazil. However, important taxonomic features were not addressed in the original description and the type specimens were deposited in neither the designated museum nor anywhere else, which makes the identity...
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Citations
The expression ‘you need to know to conserve’ is a well-known cliche among biologists. Documenting the richness of a group of organisms is the first step towards understanding biodiversity and preparing efficient conservation plans. In this context, many efforts have been made to quantify the number of species on Earth and estimate the number of species still unknown to science. A few countries have complete and integrated databases estimating the approximate number of species recorded for their territory, particularly in the Global South. In Brazil, a country of continental dimensions, revealing the richness of the second most diverse clade of invertebrates (=Mollusca) has been a goal of taxonomists. Recently, in an unprecedented, collective, and integrated effort among Brazilian malacologists, it was possible to estimate how many valid species of molluscs are there in Brazil. In this effort, more than 30 mollusc experts joined together to update the Taxonomic Catalogue of the Brazilian Fauna (TCBF), a governmental website that allows a quick and real-time updating of all Metazoan. So far, more than 5,000 updates have been made in TCBF, indicating the presence of 3,552 valid species of molluscs in Brazil, distributed among the main clades as follows: Caudofoveata (10 spp.), Solenogastres (6 spp.), Polyplacophora (35 spp.), Scaphopoda (43 spp.), Cephalopoda (92 spp.), Bivalvia (629 spp.) and Gastropoda (2,737 spp.). The present study, in addition to demonstrating for the first time the richness of Brazilian molluscs, also presents the state of the art of this important phylum of invertebrates highlighting its most representative and neglected groups.
KEY WORDS:
Malacology; taxonomy; database; number of species; molluscan species; biodiversity; conservation
The MD 55 cruise of the R/V Marion Dufresne was an important French-Brazilian expedition devoted to the exploration of the shallow offshore waters and benthos off the south-eastern coast of Brazil. Four polyplacophoran species belonging to the families Ischnochitonidae Dall, 1889 and Acanthochitonidae Pilsbry, 1893 were sampled during the cruise and are studied herein. We compare the material with the original descriptions and voucher material whenever possible. Range extensions are reported for Stenoplax marcusi (Righi, 1971), Acanthochitona ciroi Righi, 1971, and A. terezae Guerra-Junior,
1983. A new species of Acanthochitona Gray, 1821 is described, Acanthochitona oxum n. sp. It differs from other Western Atlantic congeners by the presence of round to oval tegmental pustules and the straight external margin of the insertion plate.
Despite the increasing focus on biodiversity of mesophotic coral ecosystems (MCEs) on a global scale, some biological groups, such as molluscs, are still poorly investigated. The taxonomic diversity of the molluscan fauna of a scarcely known MCE of the Western Equatorial Atlantic, Northeastern Brazil, was surveyed. Samples were collected along the shallower strata of the upper mesophotic zone (between 33-36 m depth). Twenty-one taxa (nine species of gastropods, ten species of bivalves, and two taxa of chitons) were listed, two of which (Novastoa sp. and Thylaeodus sp.) are potential endemic species. A new northern limit of distribution of Persicula moscatellii was established and seven species had new bathymetric records for living specimens (Barbatia domingensis, Barbatia cancellaria, Lamychaena hians, Leiosolenus bisulcatus, Pinctada imbricata, Hipponix incurvus, and Persicula moscatellii). Hipponix costellatus are the most representative species with 49 individuals, followed by Lima caribaea with six individuals. The present work is the first contribution to the knowledge of the molluscan fauna associated with consolidated substrates from this little-known MCE.
Background:
This study investigates the marine macroinvertebrate fauna of rhodolith beds (non-geniculated red corallinaceaous algae) in northeast Brazilian. A total of 57 species were identified, belonging to six phyla (Platyhelminthes, Annelida, Sipuncula, Mollusca, Arthropoda and Echinodermata), of which 50 are considered here as new records for the Paraíba State. Annelids (Class Polychaeta) were the most representative taxa in Miramar and Seixas Beaches, while molluscs were dominant in Maceió Beach.
New information:
This is the first study that includes an identification key, diagnostic features and distribution patterns worldwide and local (including new records) of the marine invertebrate fauna associated with rhodolith beds in northeast Brazil (State of Paraíba). Sampling events were performed in 2018, at low tide in the intertidal to shallow subtidal zones (1.5 and 4.0 m depth), in Miramar, Seixas and Maceió Beaches. A total of 17 species were found for the first time on Seixas Beach, as well as all identified species for Miramar and Maceió. This study tries to contribute to the knowledge of marine invertebrates in northeast Brazilian shallow habitats, providing a baseline for future environmental studies.
