Glyphus marsupialis Filhol 1884

Glyphus marsupialis Filhol, 1884 (Figures 1, 2, 5) Glyphus marsupialis Filhol, 1884: 231; 1885: 140. Glyphus marsupialis — Holthuis 1993: 25; Crosnier & de Bondy 1968: 42; Longhurst 1970: 278; Crosnier & Forest 1973: 144; Méndez 1981:68; Macpherson 1983: 53; Hendrickx & Wicksten 2004: 140; De Grave & Fransen 2011: 255. Sympasiphaea annectens Alcock, 1901: 63; Burukovsky 1970: 149. Sympasiphaea imperialis Terao, 1922: 110. Material examined. 1 female (cl 64.3 mm), ReviZEE— North Score, 04°07′38″N, 048°44′37″W, Amapá state, 944 m, muddy bottom (Labcrus: 76.1.1A). 1 female (cl 81.6 mm), ReviZEE— North Score, 04°07′38″N, 048°44′37″W, Amapá state, 944 m, muddy bottom (Labcrus: 76.1.1B). Diagnosis: Rostrum short, slightly overreaching eyes in adults, unarmed dorsally, with one small ventral tooth (situated near its apex in juveniles and almost in rostrum middle length in adults); extending posteriorly in a dorsal carina almost reaching posterior margin of carapace; carapace dorsal margin bearing 5–8 teeth that disappear or are reduced in larger specimens (Fig. 1). Antennal and branchiostegal teeth present. Antennal spine followed by an antennal carina extending to 1/5 to 1/7 of carapace length; below the end of antennal carina there is a large drop shaped nodule, followed by a carina extending to the beginning of the branchial region; at this point a inclined H is formed by the union of three more carinae; one superior extending through branchial region (branchial carina) until near carapace posterior end; and two inferior, one posterior extending until about half of carapace length and one anterior extending to the branchiostegal tooth (branchiostegal carina) (situated above carapace antero-ventral angle) (Fig. 2). Carapace cardiac region with a set of numerous worm-like carinae, varying between specimens and also between the two carapace sides of the same specimen. Ocular peduncle with a basal tubercle (Fig. 2). Pleon pleura with variable worm like relief (Fig. 2); second to sixth pleonal somites with dorsal carina; fourth to sixth pleonal somites with the dorsal carina ending in a tooth (Fig. 1). Telson with four pairs of distal spines, outer pair longer than three inner pairs; without dorsal spines; longitudinally grooved (modified from Crosnier & Forest 1973). Distribution: Western Atlantic Ocean: North: West Gulf of Mexico (Felder & Camp 2009); Surinam, French Guiana (Takeda & Okutani 1983); South Atlantic Ocean: Brazil, Amapá state, continental slope, 944 m depth (Fig. 5). Eastern Atlantic Ocean: from Occidental Sahara to Mauritania (from 25 o 39'N to 20 o 38'N), South of the Canary Islands (25°39'N, 16°02'W) (Filhol 1884); Senegal and Guinea Gulf from 3 o 33'S and 11 o 58'S, Gabon, Congo and Angola (Crosnier & Forest 1973); Senegal (14 o 42'N, 17 o 32'W) and Liberia (6 o 02'N, 10 o 56'W) (Burukovsky 1970); Namibia (from 17°42'S to 24°01'S) (Macpherson 1983). Arabian Sea south-west of Cape Comorin (Alcock 1901). Western Pacific Ocean: purchased at the market of Uchiura, Japan (Terao 1922). Eastern Pacific: off Panama (5 o 09′N, 81 o 41′W) (Hendrickx & Wicksten 2004), off Chicama, Peru (7º56′S) (Méndez 1981). Remarks: The rostrum in both specimens was broken, so it's impossible to describe its length; the ventral teeth were also probably lost in the broken parts of rostrum (lost about half-length in larger specimen and from the base in the smaller specimen). The carapace dorsal carina, bears four teeth in its anterior portion in the material herein observed (Figs. 1, 2) and this low number is probably related with the reduction or loss of these teeth in larger specimens as observed by Crosnier and Forest (1973). The disposition of the set of vermiform carinae on the carapace and cardiac region observed herein varies between specimens (Fig. 2) and between the two carapace sides of the same specimen. The sixth pleonal somite of the material herein examined presents a dorsal spine not mentioned by Crosnier and Forest (1973) (Fig. 1). The telson in the material herein examined is broken at its distal part. Besides that, comparing our material with comments on juveniles’ morphology made by Crosnier and Forest (1973) it becomes clear that adults and juveniles show many morphological distinctions. It is intriguing that after some deep sea cruises performed in deeper waters of the southwestern Atlantic (e.g., Living Resources Survey Program of the Exclusive Economic Zone—ReviZEE and the Environmental Characterization Project of Deep Waters of the Campos Basin—Oceanprof) which recorded many deep sea shrimp specimens, including 10 Pasiphaeidae species, the only regional record of G. marsupialis is from the Amazonian Province. Maybe, the Amazonas river system is acting as a boundary to this pelagic species, as in other taxa (Moura et al. 2016; Francini-Filho et al. 2018).