Acanthochondria cyclopsetta Pearse 1952

• Main Authors: Tang, Danny, Kalman, Julianne E., Ho, Ju-Shey
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Poecilostomatoida; Chondracanthidae; Acanthochondria; Acanthochondria cyclopsetta; Northwest Atlantic
• Online Access: https://doi.org/10.5281/zenodo.6198871; http://treatment.plazi.org/id/E91687DD3873FFF459908C06FE5C53CA

Acanthochondria cyclopsetta Pearse, 1952 (Figs 1–4) Material examined. 3 Ψ and 3 ɗ [1 Ψ with attached ɗ, 1 Ψ with 2 attached ɗ, and 1 Ψ without attached ɗ] (CASIZ 180282), ex branchial cavity wall of 1 Cyclopsetta fimbriata (Goode & Bean) (170.2 mm SL; CAS Fish Catalogue No. SU 49886), from the northwest Atlantic Ocean (32°26΄N, 79°13΄W), off the coast of South Carolina, U.S.A., 4 February, 1940. Redescription of adult female. Body (Figs 1 A–B) divided into head, short neck, and large trunk. Total body length (from anterior margin of head to distal end of posterior processes on trunk) 5.67 mm; trunk width 2.33 mm (n = 1). Head composed of cephalosome only, about as long as wide. Neck region composed of first and second pedigers, former proportionately smaller than latter. Trunk composed of pedigers 3 and 4, delimited anteriorly from neck by transverse constriction, with pronounced mid-lateral constriction and pair of posterolateral processes; latter about 1.70 times as long as genito-abdomen. Genito-abdomen (Figs 1 A–C) divisible as 2 tagmata by transverse constriction; anterior tagma (genital somite) about as long as posterior tagma (abdominal somite), former with ventral pair of genital apertures (usual mid-ventral pair of setae not observed); posterior tagma suboval, slightly narrower than genital somite, with dorsal pair of sensilla and anteroventral pair of caudal rami. Caudal ramus (Fig. 1 C) spiniform, armed with 2 ventral setae, 1 dorsal seta, and 1 inner knob. Antennule (Figs 1 D–E) unsegmented, distinctly separated into large fleshy base and narrower tip (Type B- V); latter ornamented with 2 patches of minute spinules along ventral margin and armed with 13 elements in total. Antenna (Fig. 2 A) 2-segmented, composed of coxobasis and 1-segmented endopod; coxobasis short, unarmed; endopod forming powerful uncinate claw bearing transverse surface striations near tip. Labrum (Fig. 2 B) with row of spinules along posterior margin. Mandible (Fig. 2 C) 1-segmented, with apical falcate blade armed with 46 ...