Campylaspis bicurvata Duda, Roccatagliata, Lucatelli & Filho, 2025, sp. nov.
Creators: name: Duda, Maria Luiza De F.
name: Roccatagliata, Daniel
name: Lucatelli, Debora
name: Souza- Filho, Jesser F.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Cumacea
Nannastacidae
Campylaspis
Campylaspis bicurvata

description: Campylaspis bicurvata sp. nov.
(Figs. 1–4)
Material examined. Holotype: 1 subadult female (3.4 mm), T700 N 4#10, 21º14’34.508”S 40º12’39.398”W, 700 m depth, April 2019, MOUFPE 21056. Paratypes: 1 juvenile female (2.0 mm), T700 N 4#20, 21°6’15.966”S 40°11’54.089”W, 688 m depth, April 2019, MOUFPE 21039; 1 subadult male (2.2 mm), T700 N 4#17, 21º8’20.076”S 40º12’20.329”W, 726 m depth, April 2019, MOUFPE 21040; 1 subadult male (SEM photographs) T700 N 4#19, 21º6’34.517”S 40º11’52.285”W, 702 m depth, April 2019, MOUFPE 21041; 1 subadult male T700 N 4#04 (dissected and drawn), 21º19’43.262”S 40º12’25.232”W, 700 m depth, April 2019, MOUFPE 21042; 1 juvenile male (1.8 mm), T700 S 5#10, 23º42’57.884”S 41º20’44.801”W, 686 m depth, April 2019, MOUFPE 21686; 1 juvenile female (1.2 mm), T700 N 4#12, 21º11’42.702”S 40º12’30.265”W, 733 m depth, April 2019, MOUFPE 21687; 1 juvenile male (2.2 mm), T700 N 4#02, 21º21’4.849”S 40º11’51.918”W, 705 m depth, April 2019, MOUFPE 21688.
Diagnosis. Carapace strongly sculptured; each side with upper and lower oblique ridges surrounding a deep depression. This depression is divided into a posterior large area (A2) and a small anterior area (A1) by a vertical ridge. Upper oblique ridge u-shape at its posterior half, surrounding an oval dorsal area (A3). Eyelobe much longer than wide, no lenses. Second pereopod, dactylus 1.5 × carpus length, with apical digitiform process.
Description of the subadult female (based on the Holotype MOUFPE 21056 and Paratype MOUFPE 21041).
Integument well calcified, showing a hexagonal pattern.
Carapace (Fig. 1, Fig. 2A, B, Fig. 4B, D) 1.6 × longer than wide, with a few scattered setae both dorsally and laterally. Sides with 2 oblique tuberculate ridges, leaving a deep depression in between, which is divided into a posterior large area (A2) and a small anterior area (A1) by a vertical ridge. Upper oblique ridge starts from base of pseudorostrum, directed backwards, and turns forward to form on the dorsal surface a nearly closed loop that encircle a third area (A3). Lower oblique ridge starts from antennal notch running backwards close to carapace inferior margin to finally meet the opposite lower oblique ridge at mid-dorsal line, right and left ridges delimiting a small triangular area dorsally, with two large tubercles just in front of this triangular area. Pseudorostrum upturned about 30°, 0.14 × carapace total length. Siphons approximately as long as the pseudorostrum. Eyelobe small, much longer than wide, no lenses. Frontal lobe with a transverse row of 5–7 tubercles, most lateral tubercles (prominences, after Jones, 1974) large and carrying 1–2 setae, central tubercles smaller without setae (other specimens examined with 2, 3, or 5 central tubercles). With 4 tubercles, arranged in two rows, behind the frontal lobe, anterior tubercles larger than posterior ones (two additional specimens examined with 6 tubercles arranged in three rows, anterior pair larger than the others). Anteroventral margin smooth or faintly serrate. Antennal notch small.
Pereon (Fig. 4A) segments 3–5 with 2 dorsal tubercles. All segments with lateral margins serrate.
Pleon (Fig. 2A, Fig. 4C) 0.6 × cephalothorax length. Pleonites 1–4 with 2 tubercles dorsally, and with 1 serrate projection and 1 row of teeth (below the projection), on each side. Pleonite 5 with 1 transverse ridge at midway of segment, and 1 row of teeth laterally.
Description of the appendages (based on a subadult male Paratype MOUFPE 21042).
Antenna 1 (Fig. 2D) Peduncle of 3 articles, first article, 1.3 x second article, with 3 simple setae, second article subequal to third, with 1 simple seta; third article with 2 simple and 2 broom setae. Main flagellum of 3 articles, decreasing in length distally, first article glabrous, second article with 1 aesthetasc and 1 short simple seta; third article with 1 aesthetasc and 2 simple setae (1 long, 1 short). Accessory flagellum of 1 article, with 1 short simple seta and 2 broom setae.
Antenna 2 on development, with 2 articles.
Mouthparts typical of the genus. Mandible with the molar process styliform. Second maxilla reduced to a simple plate without movable endites.
Maxilliped 1 (Fig. 2E): basis as long as remaining articles together, with 2 coupling hooks, endite with 1 simple and 2 setose setae. Ischium visible only on one side. Merocarpus 0.8 × basis length, inner margin with 6 simple setae, outer margin with 2 setae (1 setose, 1 simple). Dactylus 0.2 × merocarpus length with 1 simple terminal seta.
Maxilliped 2 (Fig. 2F): basis as long as remaining articles together, with 1 large setose seta on inner distal margin and 1 simple seta on outer margin. Merus 0.4 × basis length, with 1 large setose seta distally. Carpus 0.5 × merus length, with 2 setose setae and 2 teeth distally. Propodus process on outer distal angle extending beyond dactylus teeth. Dactylus with 3 teeth, central one shortest.
Maxilliped 3 (Fig. 3A) basis 0.9 × as long as remaining articles together, with 2 setose and 1 simple setae distally. Ischium glabrous, with teeth on inner margin. Merus 0.4 × basis length, inner margin with 3 simple setae and serrations. Carpus 0.3 × merus length, both margins with 1 setose seta and serrations. Propodus 2 × as long carpus, with 2 setose setae on inner margin, 1 setose seta on outer distal angle, and teeth on both margins. Dactylus 0.6 × propodus length, with 3 simple setae (1 broken) distally. Exopod, basis glabrous, flagellum of 4 articles, with large setae (not drawn).
Pereopod 1 (Fig. 3B): basis 0.7 × as long as remaining articles together, with 2 setose setae distally. Ischium with 1 setose seta. Merus with 7 barely setose or simple setae, outer margin with a few teeth. Carpus 0.7 × as long as merus, with 8 barely setose or simple setae, outer margin with a few teeth. Propodus 1.1 × as long as carpus, with 9 barely setose or simple setae. Dactylus 0.7 × propodus length, with 9 simple setae. Exopod, basis with a simple seta and a few teeth, flagellum of 5 articles, with large setae (not drawn).
Pereopod 2 (Fig. 3C) basis 0.5 × as long as remaining articles together, with 2 barely setose setae. Ischium glabrous. Merus with 3 barely setose or simple setae. Carpus 1.5 × as long as merus, laterally with 2 simple and 1 setose setae, distally with 1 barely setose, 1 simple and 1 short robust setae. Propodus glabrous. Dactylus (including digitiform process) 1.5 × as long as carpus, with simple and barely setose setae laterally, and 4 setae (3 large setulate; 1 minute, simple) distally, largest distal seta almost as long as article; distal end with a digitiform process extending beyond setae insertion (see detail Fig. 3C). Exopod, basis with a single seta, flagellum of 5 articles with large setae (not drawn).
Pereopod 3 (Fig. 3D) basis 1.0 × as long as remaining articles together, with barely setose and simple setae. Ischium with 1 simple seta on outer distal angle. Merus with 2 simple setae (1 broken) on outer distal angle. Carpus 1.9 × as long as merus with 5 simple setae (3 laterally, 2 on outer distal angle). Propodus 0.4 × as long as carpus, with 2 simple setae distally. Dactylus 0.5 × as long as propodus, with 3 setae (distal one 2 × as long as article). Exopod, flagellum of 2 articles.
Pereopod 4 (Fig. 3E) basis 0.8 × as long as remaining articles together, with barely setose and simple setae. Ischium with 1 small simple seta. Merus with 2 setae (1 simple, 1 serrulate) on outer distal angle. Carpus 2 × as long as merus with 4 simple setae (2 at midway of article, 2 unequal on distal outer angle). Propodus 0.4 × as long as carpus, with 1 simple seta on outer distal angle. Dactylus 0.7 × as long as propodus, with 3 setae (distal one 2 × as long as article). Exopod, flagellum of 1 article.
Pereopod 5 (Fig. 3F) basis 0.3 × as long as remaining articles together, with 2 simple setae and 1 tooth. Ischium with 1 small simple seta. Merus with 1 simple seta. Carpus 1.8 × as long as merus, glabrous. Propodus 0.4 × as long as the carpus, with 1 simple seta on distal angle. Dactylus 0.6 × as long as the propodus, with 3 simple setae (distal one 2.6 × as long as article). Without exopod.
Uropod (Fig. 2C) peduncle 1.8 × as long as last pleonite, with serrations on both margins. Rami subequal. Endopod 0.6 × peduncle length, with 3 robust setae on inner edge (2 lateral, 1 subterminal), and 2 robust setae distally (1 large, 1 small). Exopod, distal article with 1 small seta on each side, and 2 unequal setae (largest slightly longer than article) distally.
Etymology. The epithet refers to the u-shaped posterior portion of each upper oblique ridge, which defines the dorsal areas A3 on the carapace.
Type locality. Campos Basin, off Espírito Santo State, 21º14’34.508”S 40º12’39.398”W, 700 m depth.
Distribution. Known only from Campos Basin, Rio de Janeiro and Espírito Santo States, Brazil, 686–733 m depth (Fig. 8).
Remarks. Campylaspis bicurvata sp. nov. is most similar to C. chisamerai Petrescu, 2018 (Australia). Both species share the following features: pseudorostrum long and upturned; siphons relatively long; sides of carapace with two oblique ridges; areas A1, A2 (schematized in Fig. 1) well defined; frontal lobe with a transverse row of tubercles; dactylus of pereopod 2 with a digital process. Campylaspis bicurvata sp. nov. can be easily separated from C. chisamerai by having a well-defined A3 (poorly defined in C. chisamerai) and a long eyelobe (short in C. chisamerai). Differences between Campylaspis bicurvata sp. nov. and C. chisamerai, and other similar species are listed in Table 1. The following morphological features are common to all these species: carapace with welldeveloped upper and lower ridges running obliquely backwards and defining the areas A1 and A2 when the anterior vertical ridge is present; posterior vertical ridge absent or poorly developed (except in C. undata); dorsal surface of carapace uneven due to the presence of many tubercles (except in C. exarata, which only has on a blunt prominence on each side of frontal lobe).
description: Published as part of Duda, Maria Luiza De F., Roccatagliata, Daniel, Lucatelli, Debora & Souza- Filho, Jesser F., 2025, On two new deep-sea species of the genus Campylaspis G. O. Sars, 1865 (Cumacea: Nannastacidae) from Brazil, pp. 447-462 in Zootaxa 5575 (3) on pages 448-453, DOI: 10.11646/zootaxa.5575.3.6, http://zenodo.org/record/14747209