Dulichiella ankeri, Alves, Jessika, Johnsson, Rodrigo & Senna, André R., 2014

Alves, Jessika, Johnsson, Rodrigo & Senna, André R., 2014, A new species of the genus Dulichiella Stout, 1912 (Crustacea: Amphipoda: Melitidae) from Pecém Harbor, Ceará state, Brazil, Zootaxa 3889 (2), pp. 289-300 : 290-299

Dulichiella ankeri sp. nov.

( Figs 1–8 )

Etymology. The new species is named in honor to Dr. Arthur Anker who is a great taxonomist of snapping shrimps and has much contributed to Carcinology of Ceará state.

Material examined. Holotype. Adult Male (dissected and drawn) 5.8 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, MZUSP 32750.

Paratypes. 1 male, 2 females, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, MUZUSP 32751; 10 male, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2119; 1 male (dissected and drawn) 5.2 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2120; 1 male (dissected and drawn) 5.7 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2121; 1 male (dissected and drawn) 6.0 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2122; 1 male (photograph) 6.8 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 15 May 2012, coll. S. G. Rabay, UFBA 2123; 1 juvenile male (dissected and drawn) 3.5 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2124; 1 ovigerous female (dissected and drawn) 6.0 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2125; 1 female (dissected and drawn) 5.2 mm, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2126; 9 males, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 29 April 2010, coll. S. G. Rabay, UFBA 2127; 2 males, 1 ovigerous female, 2 females, 5 juveniles, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 22 October 2009, coll. S. G. Rabay, UFBA 2128; 1 male, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 29 April 2010, coll. S. G. Rabay, UFC 808; 7 males, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 29 January 2010, coll. S. G. Rabay, UFC 809; 14 females, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 29 January 2010, coll. S. G. Rabay, UFC 810; 5 males, 7 females, 13 juveniles, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 29 January 2010, coll. S. G. Rabay, UFC 811; 21 females, ethanol 70%, Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil, 29 January 2010, coll. S. G. Rabay, UFC 813.

Diagnosis. Lateral cephalic lobe broad, truncated, anteroventral corner with slender seta. Antenna 1 accessory flagellum 5-articulate. Maxilla 1 inner plate, outer plate and palp distally enlarged and rounded. Article 1 of mandibular palp as long as broad. Distolateral crown of gnathopod 2 of males with 4 spines. Pereopods 3–7 dactylar unguis with 2 accessory spines. Pereopods 6 and 7 merus and carpus without bunches of long setae. Pleonites 1-3 with sparse dorsal setae. Pleonite/urosomite dorsal spine formula 7-7-7-5-4-4. Telson deeply cleft, with rounded lobes and dorsal robust setae.

Description. Head, rounded eyes, lateral cephalic lobe broad, truncated, anteroventral corner with slender setae. Antenna 1 peduncular article 1 shorter than article 2, with 3 robust setae on posterior margin. Accessory flagellum 5-articulate, articles subequal in length. Antenna 2 article 2 with cone gland reaching end of article 3, article 4 subequal in length to article 5. Mandible left and right incisor 4 and 5-dentate, respectively; left and right lacinia mobilis 3-dentate; molar triturative, with plumose seta; palp 3-articulate, article 1 broader than long, inner margin article 1 produced distally, article 2 slightly shorter than article 3. Maxilla 1 inner plate very slender, distally enlarged and rounded, with 2 apical plumose setae; outer plate rounded, with 8 robust setae; palp 3-articulated distally enlarged and rounded, article 1, with 2 slender setae on outer distal corner, apical part of palp article 3 with 5 robust setae. Maxilla 2 medial margin of inner plate lined with setae, apical margin with 11 setae, outer plate bigger than inner plate, distally setose. Upper lip (labrum) distally rounded and setose. Lower lip inner lobes well developed, innerdistally setose, outer lobes broad, rounded, with 2 long setae on lateral margins. Maxilliped inner plate subrectangular, distal margin setose; outer plate reaching over half of palp article 2. Palp 4-articulate; medial face of article 2 and 3 lined with setae; article 3 and 4 facially setose.

Gnathopod 1 coxa anteroventral corner not produced, anterior margin weakly convex, posteroventral corner with notch; carpus slightly longer than propodus; palm of propodus convex, defined by posterodistal corner, with posterodistal robust setae; dactylus not reaching beyond palmar margin. Gnathopods 2 greatly asymmetric, left (larger) gnathopod 2 coxa anteroventral corner not produced, anterior margin weakly convex, posteroventral corner with notch. Propodus distolateral crown with 4 rounded spines that do not exceed the dactylus, palm sinusoidal, posterodistal corner produced, upturned; dactylus reaching beyond the palmar margin. Right (smaller) gnathopod 2 posterodistal corner of merus acutely produced; palm straight, slightly serrated, posterodistal corner with robust setae. Pereopod 3 coxa subrectangular, ventral and posterior margin straight; propodus longer than merus, dactylar unguis with 2 accessory spines. Pereopod 4 coxa with posterior margin well excavated, ventral margin straight; dactylar unguis anterior margin with 2 accessory spines. Pereopod 5 basis serrated with short setae, anterior margin slightly rounded, posterior margin straight; propodus and carpus sparsely setose; dactylar unguis with 2 accessory spines. Pereopod 6, basis and merus without bunches of slender spines; basis serrated with short setae, anterior and posterior margin straight; dactylar unguis with 2 accessory spines. Pereopod 7 basis and merus without bunches of slender spines; basis anterior margin serrated and lightly rounded, posterior margin sigmoid and minutely serrated; carpus and propodus sparsely setose; dactylar unguis with 2 accessory spines.

Pleonite/urosomite dorsal spine formula 7-7-7-5-4-4. Pleonites 1-3 with sparse dorsal setae. Epimeron 1, posteroventral corner with small subacute spine. Epimeron 2, posteroventral corner acute with 2 acute spines. Epimeron 3, posteroventral corner produced, posteroventral margin slightly serrated with slender setae. Uropod 1, peduncle longer than both rami, with basofacial and dorsal setae, outer ramus lightly bigger than inner one, inner ramus with robust ventral setae. Uropod 2, peduncle shorter than the both rami, outer ramus shorter than inner one, with 5 robust setae on each margin, inner ramus with row of little setae and 6 robust setae on each margin. Uropod 3, inner ramus scale-like, much shorter than outer ramus, outer ramus longer than peduncle. Telson deeply cleft, with rounded lobes and dorsal robust setae.

Female (sexually dimorphic characters). Gnathopod 1 similar to gnathopod 1 of male, except for carpus that is longer in female. Gnathopod 2 subequal in size, similar to smaller gnathopod 2 of male; palm convex; dactylus posterior margin knurled with small setae. Pereopod 7 basis expanded, posterior margin tapering distally.

Juvenile male. Gnathopod 1 similar to gnathopod 1 of adult male. Left gnathopod 2 (larger) propodus distolateral crown with 4 rounded spines, first spine undeveloped, fourth one poorly developed, palm rounded, posterodistal corner not produced; dactylus large, reaching beyond the palmar margin.

Distribution. Known only from the type locality: Pecém Harbor (39º50’00’’ W, 3º30’00’’ S), São Gonçalo do Amarante municipality, Ceará state, Brazil.

Remarks. Dulichiella ankeri is most closely related to D. takedai from Japan and D. cuvettensis from Mauritius, by presenting distolateral crown of gnathopod 2 of males with 4 spines, pereopods 6 and 7 without bunches of long setae, and pleonites 1 to 3 with sparse dorsal setae. However, D. ankeri differs from D. takedai by the following characters: (1) the marginally setose gnathopod 1 of males; (2) the maxilla 1 apically rounded; (3) the absence of notch on coxa 3. Dulichiella ankeri differs from D. cuvettensis by the following characters: (1) the mandibular palp article as long as broad; (2) the equally developed spines 3 and 4 in distolateral crown of gnathopod 2 of males; (3) presence of two accessory spines in dactylar ungues of pereopods 3-7. Additionally, D. ankeri differs from both D. takedai and D. cuvettensis by having accessory flagellum 5-articulate, versus 4- articulate. Dulichiella ankeri differs also of D. pattaniensis from Thailand by having pereopods 6 and 7 without bunches of long setae. Dulichiella is also similar to the Atlantic species D. appendiculata , D. lecroyae and D. celestum by having 4 spines in distolateral crown of gnatopod 2 of males. Dulichiella ankeri differs from D. appendiculata due to pereopods 6-7 without long branches of setae on basis and merus. This species is also different from D. lecroyae by having 2 accessory spines in dactylar ungues of pereopods 3-7 and differs from D. celestum by the rounded spines in distolateral crown of gnatopod 2 of males. Until now, the single species of Dulichiella recorded from Brazil is D. anisochir , which is easily distinguished from D. ankeri by having 3 spines in distolateral crown of gnathopod 2 of males.

The description of D. ankeri sp. nov. from Brazil improves the knowledge of the Brazilian marine biodiversity and raises the species diversity of the genus Dulichiella to two from Brazilian waters, six from the Atlantic ocean, and 18 in the whole world.

Figures

FIGURE 1. Dulichiella ankeri sp. nov.: male, paratype, 6.8 mm, Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S, UFBA 2123. Photography provided by Dr. Arthur Anker.

FIGURE 2. Dulichiella ankeri sp. nov.: male, holotype, 5.8 mm Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S, MZUSP 32750. Scale bars: 1.0 mm.

FIGURE 3. Dulichiella ankeri sp. nov.: male, holotype, 5.8 mm, Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S, MZUSP 32750. Scale bars: 0.1 mm.

FIGURE 4. Dulichiella ankeri sp. nov.: male, holotype, 5.8 mm, Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S, MZUSP 32750. Scale bars: Gn 1 0.5 mm; rGn 2 0.5 mm; lGn 2 1.0 mm.

FIGURE 5. Dulichiella ankeri sp. nov.: male, holotype, 5.8 mm, Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S, MZUSP 32750. Scale bars: P 3 - P 7 0.5 mm; Cx 6 - 7 0.1 mm.

FIGURE 6. Dulichiella ankeri sp. nov.: male, holotype (U 1 - 2, T), MZUSP 32750; male paratype (Pln 1 - 3), 5.2 mm, UFBA 2120; male paratype (Ur 1 - 3), 5.7 mm, UFBA 2121; male paratype (U 3, Ep 1 - 3), 6.0 mm, UFBA 2122. Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S. Scale bars: U 1 - 2 0.5 mm; T 0.1 mm; U 3 0.5 mm; Ep 1 - 3 0.5 mm; Pln 1 - 3 0.5 mm; Ur 1 - 3 0.5 mm.

FIGURE 7. Dulichiella ankeri sp. nov.: ovigeorous female (fGn 1, fGn 2, fP 7, fPln 1 - 3, fUr 1 - 3), 6.0 mm, paratype, Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S, UFBA 2125. Female (fEp 1 - 3), paratype, 5.4 mm, Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S, UFBA 2126. Scale bars: 0.5 mm.

FIGURE 8. Dulichiella ankeri sp. nov.: juvenile (jGn 1, jGn 2), paratype, 3.5 mm, UFBA 2124; Male, holotype (A 1 - 2), 5.8 mm, MZUSP 32750, Pecém Harbor, Ceará state, Brazil, 39 º 50 ’ 00 ’’ W, 3 º 30 ’ 00 ’’ S,. Scale bars: A 1 - 2 – 0.5 mm; Gn 1 – 0.1 mm; Gn 2 – 0.5 mm.