Sisalia carricarti, Ortiz, M. & Winfield, I., 2014

Ortiz, M. & Winfield, I., 2014, A new genus and species of Cyproideidae (Crustacea: Peracarida: Amphipoda) from a tropical coral reef, SE Gulf of Mexico, Zootaxa 3795 (1) : -

Sisalia carricarti sp. nov.

( Figs 1–3 )

Type material. Holotype: adult male, 1.3 mm, CNCR 28281, collected from Sisal reef (Sisal Bocacha station (21°19´17.3´´N; 90°20´02.6´´W) associated with macroalgae bed ( Udotea sp.) from 6 to 8 m depth, on 0 4 July, 2012, Yucatan offshore habitat, Mexico, SE Gulf of Mexico.

Paratype: female with oostegites and five eggs, 1.1 mm, CNCR 28282, partially dissected; collected from Bajo de diez station (21°20´50.8´´N; 90°08´53.0´´W), associated with macroalgae Dictyopteris delicatula at 12 m depth, on 0 4 July, 2012.

Other material examined, CNCR 28283: female with oostegites and 1 egg, 1.3 mm; male, 1.1 mm, both associated with seaweed Callithamnion corymbosum, Puerto Progreso station (21°20´23.1´´N; 89°40´49.5´´W) from 2 to 6 m depth, on 0 5 July, 2012.

Etymology. This new species is named in honour of Dr. Juan Pablo Carricart Ganivet, great friend and a renowned Reef Coral Sclerochronology researcher of the Universidad Nacional Autónoma de México, México.

Description. Based on holotype male, 1.3 mm, CNCR28281; same diagnosis of the genus, plus:

Head with a small rostrum; eye big and rounded; with 40–46 ommatidia; antennae 1–2 as long as head (including the flagella) ( Fig 1 A, 1B, 1C).

Body dorsally smooth; combined segments 1 and 2 as long as segment 3; segment 4 a little longer than 1–3 combined; segment 4 as long as 5–7 combined; pleonal segment 3 the longest; urosomite 1 longer than 2–3 combined; epimera 1–3 with posteroventral corner unproduced; telson longer than urosomites 2–3 combined ( Fig 1 A).

Coxae 1–2 very small, quadrate; hidden by coxa 3; coxae 3–4 directed forward; coxa 3 shorter than 4, but as deep as 4, surpassing ventral corner of head; coxa 4 with posterior lobe reaching posterior border of coxa 6; coxae 5–7 small and quadrate ( Fig 1 A).

TABLE 2. The more significant morphological characters used to compare genera in the family Cyproideidae .

Genera Mandible palp Mandible molar Palp of maxilla 1 Basis of pereopod Urosomite 1 Urosomite 3 7

Austropheonoides J. L. Barnard, 1972 3 articulate large triturative 1 articulate expanded elongate, dorsally keeled unvaulted Gbroidea Lowry & Azman, 2008 3 articulate absent 1 articulate expanded elongate without dorsal keel not projected over telson Cyproidea Haswell, 1880 3 articulate medium to small 1 articulate rectolinear not elongate or keeled vaulting over telson Hoplopheonoides Shoemaker, 1956 3 articulate large 1 articulate weakly expanded elongate, dorsally keeled unvaulted Hoplopleon K. H. Barnard, 1932 absent large 2 articulate expanded elongate, dorsally keeled unvaulted Mokuoloe J. L. Barnard, 1970 3 articulate large 1 articulate expanded not elongate or keeled unvaulted Moolapheonoides J. L. Barnard, 1974 3 articulate large, triturative 1 articulate expanded elongate, dorsally keeled unvaulted Narapheonoides J. L. Barnard, 1972 absent large, triturative 1 articulate expanded elongate, dorsally keeled unvaulted Neocyproidea Hurley, 1955 absent large, triturative 1 articulate expanded elongate with boat- shaped keel, unvaulted vaulted

Paracyproidea Stebbing, 1899 3 articulate large, triturative unknown rectolinear not elongate or keeled unvaulted Peltocoxa Catta, 1875 3 articulate large, triturative 1 articulate expanded not elongate or keeled unvaulted Peltopes K. H. Barnard, 1930 3 articulate large, triturative 2 articulate expanded elongate with boat-shaped process unvaulted reaching to base of telson

Pseudopeltocoxa Schiecke, 1977 1 articulate large, triturative 1 articulate expanded not elongate with weak bilateral keels unvaulted Sisalia , gen. nov. 3 articulate large, triturative 1 articulate rectolinear not elongate or keeled not elongate or keeled Stegoplax Sars, 1883 3 articulate large triturative 1 articulate expanded not elongate or keeled unvaulted Terepeltopes Hirayama, 1983 3 articulate large triturative 1 articulate fully expanded elongate, dorsally keeled and vaulted unvaulted over urosome

Unguja Griffiths,1976 absent large triturative 1 articulate expanded elongate with pair of dorsal keels unvaulted Unyapheonoides J. L. Barnad,1972 3 articulate large triturative 1 articulate expanded not elongate or keeled unvaulted Victorhensenoides 3 articulate large triturative 1 articulate expanded not elongate or keeled with pair of dorsal keels Rauschert, 1996

Antenna 1 with flagellum 3–articulated; article one as long as articles 2–3 combined; basal article of peduncle with two long setae distally; article 2 shorter than 3; article 3 with a terminal long seta ( Fig 1 B).

Antenna 2 slender and shorter than antenna 1; peduncle article 4 shorter than 5, combined as long as 3- articulated flagellum (including apical seta) ( Fig 1 C).

Mouthpart bundle quadrate ( Fig 1 A). Mandibles with big and triturative molars; incisors armed with 8 teeth; mandible palp 3-articulated, article 3 with two distal setae, and four rakers robust setae; left mandible with lacinia mobilis of 8 teeth; missing in the right one ( Fig 1 D, 1E). Maxilliped inner lobe narrower and shorter than outer, two subterminal robust setae; outer lobe unarmed, a subdistal depression on inner margin, distally pointed; palp articles 1–3 subequal; articles 1 and 2 each with two subdistal setae on inner margin; article 3 with one small distal seta on outer margin, and another longer on inner margin; article 4 shorter than 3, naked ( Fig 1 F). Maxilla 1 outer lobe with four robust distal setae and five subdistal small setae; palp uniarticulate armed with four distal robust setae; inner lobe very small, with a tiny distal seta ( Fig 1 G). Maxilla 2 longer than wide; inner lobe wider than outer, with six distal setae; outer lobe with three distal setae ( Fig 1 H). Lower lip asymmetric; inner lobe absent; outer lobe with 3–4 setae on inner margin at each side; mandible lobes poorly developed ( Fig 1 I); Upper lip lobed asymmetricaly; devoid of setae ( Fig 1 J).

Gnathopod 1 a little smaller than 2; articles 2–3 devoid of setae; article 4 with a subdistal and short seta on posterior margin; article 5 short, a posterior long seta; article 6 3x longer than 5, with two setae on medial posterior margin and another subterminal; palm oblique; palmar angle poorly defined; dactylus armed with 6–7 robust setae on inner margin ( Figs 2 A, 3G).

Gnathopod 2 article 2 with seven long setae on anterior margin and one distal seta on outer; article 3 with two posterodistal setae; article 4 forming posterior lobe, bearing 2 midway long setae on posterior margin, and four distal and long setae; article 5 forming posterior lobe similar in shape to that on article 4, armed with a very strong and long robust setae, among three upper and three lower more, which are normally developed; article 6 subrectangular; palm oblique, armed with two small and four stronger teeth; palmar angle poorly defined; dactylus with 6–8 teeth on basal half of outer margin, and others five on inner margin ( Figs 2 B, 3G).

Pereopods devoid of long setae ( Figs 2 C–E, 3A–B).

Pereopod 3–4 very similar; article 2 almost as long as articles 3–5 combined; article 5 shorter than 6; article 6 the longest, with one very short seta, midway on posterior border and another, distally; dactylus shorter than article 6 ( Fig 2 C, D).

Pereopod 5 article 2 longer than 3–4 combined; rest missing in the type, but similar to those of pereopod 2 and 3, when checked on another male ( Fig 2 E).

Pereopods 6–7 similar; article 2 almost as long as articles 3–5 combined, with one midway small setae on posterior margin; article 4 forming a small posterior lobe; article 6 longer than 5, with one small midway seta on anterior margin; dactylus shorter than article 6 ( Fig 3 A, B).

Uropod 1 the longest; peduncle naked; rami subequal in length, with one subdistal small seta ( Fig 3 C).

Uropod 2 peduncle with one distal seta; inner ramus longer than outer, armed with one basal seta; rami with one small subterminal seta ( Fig 3 D).

Uropod 3 devoid of setae; peduncle as long as rami; outer ramus longer than inner ( Fig 3 E).

Telson entire, subtriangular and inflated vertically, in lateral view, longer than wide, with two small tubercles midway, in dorsal view ( Fig 3 F).

Paratype, female, 1.3 mm, CNCR28282, similar to male; oostegites long and slender, with very few setae; oostegite on gnathopod 2 as wide and long as article 2, with an apical point armed with one seta.

Observations. The most important variation in males included the anterior teeth on dactylus of gnathopod 2 of young specimen are longer than in adult males ( Fig. 3 G). The holotype of this new species was collected in Udotea sp. bed, with one ovigerous female of the cyproideid amphipod Hoplopheonoides shoemakeri Ortiz, Lalana & Sánchez –Díaz 2000.

Figures

FIGURE 1. Sisalia carricarti gen. nov. et sp. nov., A, lateral view of holotype male; B, antenna 1; C, antenna 2; D, right mandible; E, left mandible; F, maxilliped; G, Maxilla 1; H, maxilla 2; I, lower lip; J, upper lip.

FIGURE 2. Sisalia carricarti gen. nov. et sp. nov., holotype male. A, gnathopod 1; B, gnathopod 2; C, pereopod 3; D, pereopod 4; E, pereopod 5.

FIGURE 3. Sisalia carricarti gen. nov. et sp. nov., holotype male (A-F); other material-young male (G). A, pereopod 6; B, pereopod 7; C, uropod 1; D, uropod 2; E, uropod 3; F, telson; G, gnathopods of young male.