Calozodion pabisi Jakiel & Jóźwiak, 2015

Jakiel, Aleksandra, Stępień, Anna, Jóźwiak, Piotr, Serigstad, Bjørn & Błażewicz-Paszkowycz, Magdalena, 2015, First record of Tanaidacea (Crustacea) from a deep-sea coral reef in the Gulf of Guinea, Zootaxa 3995 (1), pp. 203-228 : 205-211

Calozodion pabisi Jakiel & Jóźwiak sp. nov.

Figs 3–6

Material examined. Holotype— non-ovigerous female (Cat. No. ZMBN 105683; GenBank Acc. No KP225292 ), Sta I BR, Gulf of Guinea, 4°45'40.7"N 3°09'10.8"W, depth 386 m, 17 November 2012.

Paratypes— seven non-ovigerous females (one dissected), one ovigerous female, one brooding female, three males (including one dissected), ten mancae (Cat. No. ZMBN 105684), one male (Cat. No. ZMBN 105685, GenBank Acc. No. KP225293 ); the same locality as a holotype.

Diagnosis. Rostrum short, flat and with crenulated distal margin. Pleotelson with two strong lateral apophyses bent upward. Article-1 of mandibular palp inner margin with seta and distinct apophysis. Labial palp with distal spine. Cheliped basis with ventral spine; basis, merus and carpus with only few simple or plumose setae. Pereopods 2–4 basis with dorsal apophyses and with only few simple setae. Pleopods with biarticulated exopod. Uropod exopod short, bisegmented.

Etymology. We dedicated this species to our colleague and excellent fellow—Dr. Krzysztof Pabis.

Description of female. Body ( Fig. 3 A–B, D–E) length 2.5 mm (holotype 3.2 mm; others 2.8–4.6 mm), 5.6 times as long as wide; cephalothorax 20% of total body length, eyes present, with pigment, rostrum short and flat with crenulated distal margin; epistome ( Fig. 3 B) conspicuous; pereonites similar in length, 0.4 times as long as wide, pereonites 2–3 with plumose, lateral seta on each side, pereonites 4–6 with two plumose setae laterally on each side; pleon about 23% of total body length, with five free pleonites, each with two or three plumose setae, and with acute margin laterally; pleotelson with two long apophyses bent up, and with five pairs of plumose setae.

Antennule ( Fig. 4 A) peduncle article-1 4.5 times as long as wide, with one large and two small apophyses on inner margin and two small apophyses on outer margin, as well as two simple and three penicillate setae and spine on inner margin and two simple and four penicillate setae and spine on outer margin and two penicillate setae on the midlength of article; article-2 0.3 times as long as article-1, with two simple setae at midlength, two setae and minute spine on inner margin; one simple and three penicillate setae distally on outer margin; article-3 2.4 times as long as wide, with simple seta at the midlength, two simple setae distally on inner margin, and with two simple setae on outer margin; article-4 with three simple and one penicillate setae; main flagellum with seven segments, with one to four simple distal setae; segments 4 and 5 each with one aesthetasc; segment-7 with five simple setae; accessory flagellum with two segments: segment-1 with penicillate seta and simple distal seta; segment-2 with three simple setae and penicillate seta distally.

Antenna ( Fig. 4 B) peduncle article-1 2.2 times as wide as long, with crenulated distal margin; article-2 3.3 times as long as wide, with three apophyses, two spines (middle and distal) and five simple setae; article-3 as long as wide, with penicillate distal seta; article-4 2.4 times as long as wide, with minute spine on outer margin and two penicillate setae on inner margin; article-5 three times as long as wide, with two penicillate setae on outer margin, penicillate seta at the midlength and with one simple, and one penicillate setae on inner margin distally; flagellum with four segments; segment-1 with two simple setae, segment-2 with two simple setae and penicillate seta, segment-3 with seta, segment-4 with five simple, distal setae. Squama small, with three simple, distal setae.

Mouthparts. Right mandible ( Fig. 5 A) incisor simple, with two small setae on outer margin; setiferous lobe with four multifurcate setae; mandibular palp ( Fig. 5 B) with three articles: article-1 1.4 times as long as wide, with distinct apophysis and simple seta on inner margin and small seta on outer margin; article-2 2.5 times as long as wide, with two long and nine short plumose setae and a simple seta on inner margin; article-3 0.6 times as long as article-2, with seven setae; molar ( Fig. 5 C) stout, blunt, distally setose. Maxillule ( Fig. 5 D) outer endite lateral margins setose, with eight spines distally and with two plumose setae subdistally; inner endite margins setose, with four robust plumose setae; palp ( Fig. 5 D’) with two articles, distal article with four terminal setae. Maxilla ( Fig. 5 E, E’) outer lobe of moveable endite with four distal and two subdistal setae, inner lobe with five distal setae; outer lobe of fixed endite with three bifurcated, one plumose and five simple setae; inner lobe of fixed endite with plumose seta and twelve simple setae and spine. Labium ( Fig. 5 F) with row of apophyses and two small setae on outer margin; palp lateral margins setose, distally with setulose spine.

Maxilliped ( Fig. 5 G) basis laterally expanded, 0.7 times as long as wide, with minute serration on outer margin; palp article-1with simple outer seta and long plumose inner seta; article-2 1.5 times as long as wide, with plumose seta on outer margin, and ten plumose setae on inner margin; article-3 0.7 times as long as article-2, with six plumose setae on inner margin; article-4 1.5 times as long as wide, with six plumose setae and two simple setae distally; maxillipedal endite ( Fig. 5 G’) with four simple and one plumose setae and four spines distally; inner margin with two robust plumose setae and three coupling hooks; outer margin finely setose.

Epignath ( Fig. 5 H) broad, cup-shaped and terminated by strong plumose seta.

Cheliped ( Fig. 4 E) exopodite distal article with four plumose setae; basis 1.8 times as long as wide, with simple seta, robust spine and two penicillate setae ventrally and with three short dorsal setae; merus with ventrodistal apophysis and three ventral setae; carpus with four simple setae and ventral spine, and dorsodistal seta; chela robust, propodus almost as long as wide, with four simple setae and spine ventrally and two short dorsal simple setae; fixed finger cutting edge with four denticulate spines and seven simple setae, ventral margin with three setae; dactylus with three setae and four denticulate spines on cutting edge.

Pereopod-1 ( Fig. 6 A) basis three times as long as wide, with two large and three small apophyses on dorsal margin, six plumose dorsal setae, four simple ventral setae, two simple setae and spine distoventrally; ischium with three simple setae; merus about twice as long as carpus, with spine, two simple setae and plumose seta distoventrally, five simple ventral setae, spine and plumose seta distodorsally; carpus 1.2 times as long as wide, with five simple setae and spine ventrally and spine, four simple and two plumose setae distodorsally; propodus subequal carpus, twice as long as wide, with three ventral spines, denticulate distoventral spine and four simple setae ventrally, as well as simple seta, penicillate seta and spine dorsally; dactylus with unguis 1.2 times as long as propodus, with simple dorsal seta and two simple ventral setae.

Pereopod-2 ( Fig. 6 B) basis 4.7 times as long as wide, with apophysis, penicillate seta and plumose seta dorsally, and with five simple ventral setae; ischium with three simple ventral setae; merus twice as long as wide, with plumose dorsal seta and three plumose ventral setae; carpus subequal merus, with three simple setae and plumose seta distodorsally and with two spines, two simple and two plumose setae ventrally; propodus five times as long as wide, twice as long as carpus, with three spines and plumose seta ventrally, and plumose distodorsal seta; dactylus and unguis together as long as propodus, with two minute setae.

Pereopod-3 ( Fig. 6 C) basis five times as long as wide, with apophysis, three penicillate and three simple setae dorsally, and three simple and one plumose ventral setae; ischium with minute ventral seta; merus 1.6 times as long as wide, with spine and plumose seta ventrally; carpus 1.8 times as long as wide, with simple seta and plumose seta dorsally, spine, plumose seta and denticulate seta ventrally; propodus five times as long as wide, twice as long as carpus, with plumose seta and two simple distodorsal setae, with three spines and two denticulate setae ventrally; dactylus and unguis 0.8 times as long as propodus, with two minute setae.

Pereopod-4 ( Fig. 6 D) basis four times as long as wide, with apophysis and simple seta dorsally and five simple ventral setae; ischium with two simple ventral setae and simple dorsal seta; merus 1.6 times as long as wide, with spine and two simple ventral setae; carpus 2.2 times as long as wide, with spine and two simple setae ventrally and two simple dorsal setae; propodus 1.5 times as long as carpus, with simple and penicillate setae dorsally, three spines, two simple setae and denticulate seta ventrally; dactylus with unguis 0.7 times as long as propodus, with two simple setae.

Pereopod-5 ( Fig. 6 E) basis 3.8 times as long as wide, with minute dorsal seta; ischium with simple ventral seta; merus 2.8 times as long as wide, with three simple distodorsal setae; carpus 2.3 times as long as wide, 0.7 times as long as merus, with two distodorsal and two distoventral simple setae; propodus 3.6 times as long as wide, with penicillate seta and three simple setae distodorsally and four ventral spines; dactylus with unguis 0.8 times as long as propodus.

Pereopod-6 ( Fig. 6 F) coxa with plumose seta; basis 5.6 times as long as wide, with penicillate seta and ten plumose setae; ischium with plumose seta ventrally; merus 2.6 times as long as wide, with four plumose setae on dorsal margin and four simple setae and plumose seta ventrally; carpus 2.2 times as long as wide, 0.7 times as long as merus, with three plumose dorsal setae, two plumose and two minute ventral setae; propodus 3.9 times as long as wide, 1.7 times as long as carpus, with three simple setae and row of seventeen plumose spines along ventral to distal margin, and three distodorsal setae; dactylus with unguis 0.8 times as long as propodus, with two simple dorsal setae, two minute ventral setae and distal seta.

Pleopod ( Fig. 6 G) all pleopods similar; basal article 1.5 times as long as wide, naked; exopod with ten plumose setae; endopod with two articles, proximal article with one ventral seta, distal article with ten plumose setae.

Uropod ( Fig. 6 H) basis three times as long as wide, with four simple and two plumose setae; endopod with 12 segments, segment-4 with two simple and two penicillate setae; segment-6 with one long simple seta; segment-7 with two simple and one penicillate setae distally; segment-9 with one simple long seta; segment-10 with four simple setae; segment-12 with four simple and one penicillate setae.

Adult male. Body length 3.8–4.2 mm. Chelipeds similar, sexually dimorphic, much larger ( Fig. 4 F) than those of female; basis and carpus about 1.5 times as long as wide, cheliped propodus about 2.5 times as long as carpus (in female only slightly longer than carpus). Antennule ( Fig. 4 C) with article-1 about seven times as long as wide, articles 3, 5 and 6 elongated with length to width ratio being 6.2, 4.6 and 3.5, respectively.

Distribution. This species is known only from the type locality at a depth of 386 m.

Remarks. Based on a review of the literature and using the key of Menioui (2013) for the separation of the ten species previously included within the genus Calozodion , C. pabisi sp. nov. appears to be most similar to the type species C. wadei Gardiner, 1973 , which is known from the tropical northwestern Atlantic waters ( Gardiner 1973; Guţu 1984). C. pabisi has a mandibular palp with distinct spine-like apophysis and a single seta on inner margin of article-1, pereopod-4 with basis having a distinct apophysis, and biarticulated pleopodal endopod C. wadei has three setae on mandibular palp article-1 inner margin and no distinct apophysis. Moreover its basis of pereopod-4 lacks an apparent apophysis and it has an uniarticulate pleopodal endopods.

Figures

FIGURE 3. Calozodion pabisi sp. nov., holotype female. A, D, body dorsal view; B, E, body lateral view. Male. C, body lateral view. Scale bar: 1 mm.

FIGURE 4. Calozodion pabisi sp. nov., female. A, antennule; B, antenna; E, cheliped. Male. C, antennule; D, antenna; F, cheliped. Scale bar: 0.1 mm.

FIGURE 5. Calozodion pabisi sp. nov., female. A, right mandible incisor and setiferous lobe; B, mandibular palp; C, mandibular molar process; D, maxillule endites; D’, maxillule palp; E, maxilla moveable endite; E’, maxilla, fixed endite; F, labium; G, maxilliped; H, epignath. Scale bar: 0.1 mm.

FIGURE 6. Calozodion pabisi sp. nov., female. A, pereopod- 1; B, pereopod- 2; C, pereopod- 3; D, pereopod- 4; E, pereopod- 5; F, pereopod- 6; G, pleopod; H, uropod. Scale bar: 0.1 mm.