Cymadusa filosa Savigny 1816
Creators: name: Thacker, Dimple
name: Myers, Alan
name: Trivedi, Jigneshkumar
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ampithoidae
Cymadusa
Cymadusa filosa

description: Cymadusa filosa Savigny, 1816
(Figs 5–8)
Cymadusa filosa Savigny, 1816: 51, 109, pl. IV, figure 1a, b, e, i, o, u; Monod, 1971: 176–184, figures 66–78; Krapp-Schickel, 1982: 106–108, figures 71, 72, key; Ledoyer, 1982: 130–135, figures 44–46; Ledoyer, 1984: 15–18, figures 5, 6; Lyons &
Myers, 1990: 1203, figures 7, 8; Peart, 2004: 304-310, figures 1-4.
Ampithoe filosa Audouin, 1826: pt 4: 93, pl. XI, figures 4, 5.
Grubia hirsuta Chevreux, 1900: 95–101, figures 1–5; Chevreux & Fage, 1925: 339–340, figure 347; Schellenberg, 1925: 186–187.
Grubia coei Kunkel, 1910: 97, figure 38.
Grubia filosa Ruffo, 1938: 147, 172; Ruffo, 1947: 169–173, figures 1–3; Ruffo, 1959: 19; Ruffo, 1969: 62–63; Oliveira, 1953: 358–364, figures 22, 23.
Grubia sardenta Oliveira, 1953: 365, pls 25, 26.
Materials examined. Four males (8–13 mm); four females (8–10 mm), LFSC. ZRC –194, from algae growing on submerged rocks, Shivrajpur (22º19’53.4’’N 68º56’59.6’’E), Gujarat State, India, 28 February 2022, coll. D. R. Thacker.
Description. Based on male, 13 mm.
Head: Eyes medium. Antenna 1 longer than antenna 2; peduncular article 1 subequal to article 2; article 3 shorter than article 1 and 2; accessory flagellum 2 articulated. Antenna 2 densely setose on lateral margins.
Pereon: Gnathopod 1 smaller than gnathopods 2, poorly setose; coxa with straight anterior margin, ventral margin having oval anterior corner with long setae; basis longer than coxa, distal lobe present; ischium small; merus produced into long, acute, conical anteroventral lobe; carpus longer than merus and propodus, subequal to basis, longer than propodus; propodus oval with straight palm; dactylus as long as palm. Gnathopod 2 larger than gnathopods 1, lateral margins with long dense plumose setae; coxa with round corners and setose ventral margin; basis longer than coxa, distal lobe present; ischium small and rectangular; merus formed into small, subacute, anteroventral lobe; carpus longer than merus, shorter than propodus; propodus large, subquadrate; palm straight with small, posterodistal tooth, mid-palmar tooth absent; dactylus subequal to palm.
Pleon: Uropod 1 peduncle with 13 robust setae; endopodite longer than exopodite. Uropod 2 endopodite longer than exopodite. Uropod 3 exopodite subequal to endopodite with both hooks curved; lateral margin with setal fringe; apical setae present on endopodite. Telson fleshy, somewhat triangular with lateral and apical setal fringe.
Distribution. Mediterranean Sea (Peart, 2004), Brazil (Andrade & Senna, 2017), India (present study).
Remarks. The specimen examined in the present study agrees with the description given by Peart (2004) in having the male gnathopod 2 lateral margins with long dense plumose setae and the propodus palm being straight with a small, posterodistal tooth, lacking a mid-palmar spine.
description: Published as part of Thacker, Dimple, Myers, Alan & Trivedi, Jigneshkumar, 2023, A new species and a new record of the amphipod genus Cymadusa Savigny, 1816 (Senticaudata, Ampithoidae) from India, pp. 393-405 in Zootaxa 5297 (3) on pages 398-402, DOI: 10.11646/zootaxa.5297.3.4, http://zenodo.org/record/8005172