Bradyidius abyssalis, Markhaseva & Renz, 2021

Markhaseva, Elena L. & Renz, Jasmin, 2021, Description of three new species of Bradyidius (Copepoda: Calanoida), the new aetideids from the deep Pacific Ocean, with notes on the genera Bradyidius and Aetideopsis, Zootaxa 5004 (2), pp. 343-369 : 346-351

publication ID

https://doi.org/ 10.11646/zootaxa.5004.2.5

publication LSID

lsid:zoobank.org:pub:419EF04D-DC25-4A75-AC8A-6C5BAFFC07F1

persistent identifier

https://treatment.plazi.org/id/03E73B78-FFF3-FFDB-FF0C-61F97FC7C225

treatment provided by

Plazi

scientific name

Bradyidius abyssalis
status

sp. nov.

Bradyidius abyssalis sp. nov.

( Figs 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 )

Holotype. Adult female, dissected, body length 2.80 mm. SMF 37266/1-4 (slides) and 37267 (vial) (Senckenberg). Collected above the sea bed at Sta. 636, Meteor Seamount, 29° 19.24’ N 28° 37.94’ W, on 18 August 2009 by the DIVA 3 expedition, Meteor cruise ME 79–1, at a depth of 4338 m. GoogleMaps

Paratype. One adult female, partly dissected, body length 2.45 mm. ZIN, 91149 the same label data as for holotype GoogleMaps .

Additional material. Four females from the Atlantic Ocean: 1 female, body length 2.90 mm, collected in the Guinea Basin , Sta. 64 (specimen 1), 15 March 2005, 00°13.27’ S 002°29.91’ W, by the DIVA 2 expedition, Meteor cruise ME 63–2, at a depth of 5055 m GoogleMaps ; 2 females, both body length 2.90 mm, collected in the Brazil Basin , Sta. 554 (specimen 2), 22 July 2009, 26°34.70’ S 35°12.79’ W, by the DIVA 3 expedition, Meteor cruise ME 79–1, at a depth of 4485 m GoogleMaps ; 1 female, body damaged, not measured, collected in the Brazil Basin , Sta. 561 (specimen 3), 23 July 2009, 26°34.78’ S 35°13.90’ W, by the DIVA –3 expedition, Meteor cruise ME 79–1, at a depth of 4484 m GoogleMaps ;

Description. Female. Body length 2.45–2.90 mm. Prosome 3.20–3.35 times as long as urosome ( Fig. 1A–B View FIGURE 1 ). Rostrum ( Fig. 1D–E View FIGURE 1 ) two-pointed, divergent. Cephalosome and pedigerous somite 1 partly fused and pedigerous somites 4–5 separate; posterior corners of prosome prolonged into short points, covering the proximal third of genital double-somite ( Fig. 1A–B, F–G View FIGURE 1 ). Urosome of 4 somites. Genital double-somite symmetrical, anterior third in dorsal view with lateral swellings and in lateral view with dorsal swelling ( Fig. 1F–G View FIGURE 1 ). Spermathecae narrowelongate and oval-widened in the distal part ( Fig. 1F View FIGURE 1 ). Caudal rami with 1 lateral seta, 1 ventral seta, and 4 terminal setae ( Fig. 1F–G View FIGURE 1 ).

Antennule ( Fig. 2A–D View FIGURE 2 ) reaching pedigerous somite 4, of 24 articulating segments; armature as follows: I–2s (holotype, paratype and additional specimens 2 and 3), or 3s in additional specimen 1, II–IV–6s+1ae, V –2s+1ae, VI –2s, VII –2s+1ae, VIII and IX–2s each, X–XI–4s+1ae, XII and XIII–2s each, XIV –1s+1? in holotype and 2s+1ae in paratype, XV–2s, XVI –2s+1ae, XVII to XX–2s each, XXI –2s in holotype and 2s+1ae in paratype, XXII and XXIII–1s each, XXIV –2s+1ae, XXV –XXVI–2s each, XXVII –XXVIII–4s+1ae in holotype and 5s+1ae in paratype.

Antenna ( Fig. 2E–F View FIGURE 2 ), coxa with 1 seta, basis with 2 setae; exopod of 8 segments, setation formula 1,1-1-1, 1, 1, 1, 1, 1, and 3 setae, endopod segment 1 with 2 setae, endopod segment 2 with 8 + 7 setae.

Mandible ( Fig. 2G–I View FIGURE 2 ), gnathobase with 7 teeth; basis with 3 setae, middle seta small; exopod 5-segmented with 1, 1, 1, 1, and 2 setae; endopod segment 1 with 3 setae, segment 2 with 9+2 setae.

Maxillule ( Fig. 3A–B View FIGURE 3 ), praecoxal arthrite with 9 terminal spiniform setae, 4 posterior and 1 anterior setae, coxal endite with 5 setae; coxal epipodite with 7 long+2 short setae; proximal basal endite with 4 setae, tubercle with pore and small denticles along the distal border present, distal basal endite with 5 setae; endopod with 15 setae (16 setae in paratype); exopod with 10 setae.

Maxilla ( Fig. 3C–E View FIGURE 3 ), praecoxal to basal endites with 3 setae each, all endites decorated with spinules; enditiclike lobe of proximal endopod segment with 3 setal elements, two of them thicker, spine-like; endopod with 9 (2+2+2+3) setae.

Maxilliped ( Fig. 4A–D View FIGURE 4 ), syncoxa with 1 seta on proximal praecoxal endite, 2 setae on middle praecoxal endite and 3 setae on distal praecoxal endite; coxal lobe with 3 setae and tubercle with a deep notch (arrowed at Fig. 4A View FIGURE 4 ). Basis with 3 setae. Endopod 6-segmented with 2, 4, 4, 3, 3+1, and 4 setae, first segment very small and fused to basis.

Legs. P1 ( Fig. 1H View FIGURE 1 ), coxa with lateral spinules; basis with medial distal seta curved with setules; endopod 1-segmented with lateral lobe, its lateral margin with spinules and anterior surface with distal spinules; exopod segment 1 with lateral setiform spine and segments 2 and 3 with 1 lateral spine each; lateral setiform spine of exopod segment 1 exceeding the base of the lateral spine at the exopod segment 2 and nearly reaching the base of exopod segment 3 third medial seta.

P2–P4 ( Fig. 4E–G View FIGURE 4 ), coxa with 1 medial seta, P2–P3 coxa with lateral spinules, at P4 coxa lateral spinules absent; basis without seta; endopod 2-segmented in P2, 3-segmented in P3–P4; posterior surface spinules present on P2 endopod segment 2 and P3–P4 endopod segments 2 and 3.

P5 absent.

Male unknown.

Type locality. 29° 19.24’ N 28° 37.94’ W.

Etymology. The species name “ abyssalis ” refers to the depth of the species’ habitat within the Atlantic Ocean.

Remarks. Differences from known congers are given in the remarks of the next species.

SMF

Forschungsinstitut und Natur-Museum Senckenberg

ZIN

Russian Academy of Sciences, Zoological Institute, Zoological Museum

V

Royal British Columbia Museum - Herbarium

VI

Mykotektet, National Veterinary Institute

Kingdom

Animalia

Phylum

Arthropoda

Class

Maxillopoda

Order

Calanoida

Family

Aetideidae

Genus

Bradyidius

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