Atlantapseudes madagascariensis, Santos, Kátia Christol Dos & Hansknecht, Tom, 2007

Santos, Kátia Christol Dos & Hansknecht, Tom, 2007, Taraxapseudes n. gen., Taraxapseudes diversus (Lang, 1968) n. comb. and two new species of Atlantapseudes B cescu, 1978 (Tanaidacea: Apseudidae) from Brazil and Madagascar, with a key for the genus, Zootaxa 1639, pp. 23-39 : 32-38

publication ID	https://doi.org/ 10.5281/zenodo.179617
DOI	https://doi.org/10.5281/zenodo.6251882
persistent identifier	https://treatment.plazi.org/id/E63187B8-1702-FFB6-FF29-F947FA68F962
treatment provided by	Plazi
scientific name	Atlantapseudes madagascariensis
status	sp. nov.

Treatment

Atlantapseudes madagascariensis View in CoL sp. nov.

( Figs. 4–7 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 )

Holotype: male, 6.0 mm, ( USNM 1106876) Sample ID MEBOO 9 SD38 MAJ – EBS – 9, March 16, 2006, 1988 m, 14°22.13’S Lat; 46°23.21’ E Long, light yellow brown clay containing forams. Paratype: male, 6.3 mm, ( USNM 1106877) unilaterally dissected for illustrations; same locality as holotype. Additional material: 2 juveniles, Sample ID MEB0010 SD38 MAJ – EBS – 10, March 19, 2006, 2300 m, 14°20.24’ S Lat; 46°19.22’ E Long., pale brown clay with forams.

Etymology. Named after the collection locality, Madagascar.

Diagnosis: Rostrum acute and continuous with eye lobes. Eye lobes wider than rostral base. Lateral apophysis on carapace, bordered by setae. Squama of antenna long, reaching to distal level of article 4. Pereonites 3–5 with anteriolateral spines not reaching anterior margins of pereonites. Pereopod 6 propodus without transverse setal row. Pereonites 1–5 with hyposphenia. Pleonites without hyposphenia, with rounded lateral margins.

Male description. Male paratype ( Figs 4 View FIGURE 4 a,b) 6.4 mm long, widest at level of first pereonite and tapering posteriorly. Cephalothorax wider than long, 0.9 times as long as wide with acute rostrum and paired lateral eye lobes. Ommatidia not evident in eye. Eye spines followed distolaterally by spinelike apophysis bordered proximally and distally by short setae.

Pereonites 3, 4, and 5 in dorsal view with anterioproximal spines located on anterior third of article. Pereopod 1 with sharp coxal apophysis. Hyposphenia present on pereonites 1–5 in male, female and juveniles. Pereonite 6 of male with rounded genital cone.

Pleonites 1–5 trapezoidal in shape with 1 and 4 wider than others, bearing several simple dorsal setae. Pleotelson slightly longer than wide with short setae on anteriodorsal area and longer posterior setae.

Antennule ( Fig. 4 View FIGURE 4 c) (aesthetascs omitted) with peduncle of 4 articles including common bearing inner flagellum. Article 1 longest with inner surface bearing proximal broom seta and two simple setae; outer margin with two simple setae in distal half. Article 2 distally enlarged with outer margin bearing two setae and inner margin with proximal and distal setae. Article 3, quadrate with distal seta on outer margin. Common article with 3-articled inner flagellum and 11-articled outer. Common article bearing distal mesial setae. Inner flagellum with three terminal setae. Outer flagellum articles 1, 3, 4, 6 with outer margins bearing long distal setae; terminal article with four setae. Aesthetascs ( Fig. 4 View FIGURE 4 b) on outer flagellum, straplike in shape, starting just before common article with twelve on peduncular article 3 and decreasing in number with article 6 bearing six.

Antenna ( Fig.4 View FIGURE 4 d) of 11 articles with article 2 bearing elongate squama reaching nearly to level of article 4. Squama with 2 terminal setae. Article 6 with linguiform aesthetasc on inner margin. Terminal article bearing whorl of five setae.

Epistome ( Fig. 4 View FIGURE 4 b) setose with broad spine.

Labrum not illustrated.

Left mandible ( Fig. 4 View FIGURE 4 e) with stout pars molaris bearing seta and spine-like processes on mastigating surface. Incisor with 4 round processes. Outer lobe of Lacinia mobilis rounded with outer setules and five terminal spiniferous setae.

Right mandible ( Fig. 4 View FIGURE 4 f) with incisor bearing four processes and seven spiniferous setae. Pars molaris like that of the left. Palp of 3 articles with article 2 longest and bearing several simple setae on distal third. Terminal article with twelve simple setae on inner surface, with the setae increasing in length distally.

Labium ( Fig. 4 View FIGURE 4 g) with oval basal lobe, setose on inner and outer margins. Palp with three terminal spines along with mesial and outer simple setae.

Maxillule ( Fig. 5 View FIGURE 5 a) with 2–articled short palp. Terminal article bearing three subdistal and single distal serrated setae. Inner endite with two terminal spines and one setulate seta; outer margin with numerous setules. Outer endite with eleven terminal spines and setules on mid-outer margin.

Maxilla ( Fig. 5 View FIGURE 5 b) with movable endite bearing two large setulate and five simple setae on outer lobe; inner lobe with cluster of five curved setae on distal margin and four curved stouter setae on inner margin. Fixed endite with outer margin bearing three truncate and two palmate serrated setae; inner comb row with numerous basally inflated setae and less numerous, five to seven, longer guard setae.

Maxilliped ( Fig. 5 View FIGURE 5 d) palp with article 1, trapezoidal in shape with outer distal setae short on outer and long on inner margin. Article 2 largest bearing numerous simple setae on rostral row and distal medial row of six setae. Article 3 about ¼ length of second with inner distal margin bearing seven long setae; naked on outer margin of article. Article 4 obtuse, widest distally, with seven terminal setae. Endite ( Fig. 5 View FIGURE 5 e) broader than long with inner margin bearing row of seven setulate setae and three coupling hooks. Outer margin expanded with row of compound setules. Distal margin of inner side with subdistal palmate seta and cleft seta along with five angular setae. Outer side with one long subdistal seta and distal row of seven thick setae with angulate tips on the inner three.

Epignath ( Fig. 5 View FIGURE 5 c) with base bearing a proximal setulate lobe and adjoining lobe bearing an antennuated one-articled process. Distal margin of outer process with large setulate seta.

Cheliped ( Fig. 6 View FIGURE 6 a) without exopod, with stout basis with anterior margin naked and posterior margin bearing medial spine and distal short seta. Merus without setae. Carpus about ¾ length of basis with ventral margin bearing two macrosetae. Propodus with fixed finger bearing three ventral setae and six near cutting margin. Cutting margin with serrations, poorly defined. Unguis of fixed finger overlapped by that of propod. Dactylus with single dorsal seta near midpoint.

Pereopod 1 ( Fig. 6 View FIGURE 6 b) fossorial, lacking exopod, basis length about 3.5 times width with short seta on midpoint of dorsal surface. Ischium short and naked. Merus with two dorsodistal setae and ventral margin with six simple setae on posterior half along with a ventrodistal spine. Carpus, rectangular with distodorsal and distoventral spines, and both margins bearing several attenuate setae. Propodus short, about half the length of the carpus with dorsomedial spine and seta, distodorsal spine, and five ventral spines. Dactylus slightly shorter than propodus with proximodorsal seta and two ventromedial spines along with small distoventral spine projecting beneath unguis. Unguis about ¾ length of dactylus.

Pereopod 2 ( Fig. 6 View FIGURE 6 c) with basis about 5 times longer than wide. Proximodorsal margin with cusplike apophysis followed by broom seta. Distoventral margin with three setae. Ischium rectangular with distoventral seta. Merus about half length of basis with ventral row of five seta and ventrolateral distal spine; distodorsal margin with two attenuate setae. Carpus with ventral margin bearing two setae and three ventral spines along with distoventral seta on distal half of article. Dorsal margin with midlateral seta and two distal setae. Propodus with ventral margin bearing several seta and four spines on distal half of article. Dorsal margin with five attennuate setae on distal half of article. Dactylus plus unguis slightly longer than propodus. Dactylus with two dorsal setae and single ventral seta. Unguis attenuate with sharp tip.

Pereopod 3 ( Fig. 6 View FIGURE 6 d) with basis about 3.6 times longer than wide, widest near midpoint; with distodorsal seta. Ischium short, rectangular and naked. Merus about ½ length of basis with two distoventral setae. Carpus, shorter than merus with ventral margin bearing five setae, with one short and four longer; dorsal margin with three setae in distal % of article. Propodus with four attenuate setae on ventral margin, along with a distolateral seta near insertion of dactylus. Dorsal margin with four setae including one stout seta on lobe dorsal to dactylus. Dactylus about 4/5 length of propodus with two short dorsal setae. Unguis slightly curved ¾ length of dactylus.

Pereopod 4 ( Fig. 6 View FIGURE 6 e) with basis about 3.8 times longer than wide, with two strong ventral broom seta and small distoventral seta. Ischium with small distoventral seta. Merus with one proximodorsal seta and two distoventral setae, closely spaced. Carpus with distolateral fan of six seta and three ventral setae. Propodus with large mid-dorsal broom seta and distal fanlike grouping of setae including two small distodorsal, five terminal, and two distolateral spines. Two terminal seta of propodus longer than dactylus plus unguis. Ventral margin of propodus with two spines. Dactylus less than half the length of propodus with distoventral seta. Unguis slightly curved and attenuate longer than dactylus.

Pereopod 5 ( Fig. 7 View FIGURE 7 a) basis like pereopod 4, but with single broom seta. Ischium as in pereopod 4. Merus with two distoventral setae, a medial seta and one distodorsal seta. Carpus with distodorsal spine, two distolateral spines and three distoventral spines. Propodus with two short spines and one long seta ventrally; distodorsal margin with one curved spine and three setae. Dactylus with middorsal seta. Unguis and dactylus unequal in length.

Pereopod 6 ( Fig. 7 View FIGURE 7 b) basis like pereopod 5 but with middle ventral seta. Ischium like pereopod 5. Merus with distal ventral seta and dorsal seta. Carpus with two short and one long distoventral setae and a distodorsal seta. Propodus with strong proximoventral attenuate spine and distal margin with two pairs of short seta on lateral margin along with a larger one. Distodorsal margin with four setae including one large seta extending to posterior third of dactylus. Dactylus with middle dorsal seta. Unguis attenuate, slightly curved and about ¾ length of dactylus.

Pleopod ( Figs. 4 View FIGURE 4 b, 7c) basal article without seta, longer than rami. Last pleopod with setae extending nearly to end of uropod endopod. Endopod one-articled with large robust setulated basal seta on inner margin and lateral margins with long setulated seta. Exopod 2-articled with first article naked. Second article with basal mesial process bearing large setulate seta and lateral margins of article with long seta.

Uropod ( Figs. 4 View FIGURE 4 b, 7d) with basal article naked and inserted ventrolaterally. Exopod with three articles with distalmost bearing three setae. Endopod with fourteen articles. First article short with inner seta. Fourth article with pseudoarticle demarcated by outer seta and distal margin with three setae. Article 12 with linguiform aesthetasc. Tip of endopod with whorl of five terminal seta.

Female not found.

Remarks: The rostral shape of Atlantapseudes madagascariensis sp. nov. is acute and long, as compared with A. cyanea in which the shape is short and rounded. The eye spines appear to be fused to the carapace in A. madagascariensis sp. nov. but more material needs to be examined to determine this and if sexual dimorphism is exhibited. No spine-like apophysis is found on pereonite 2 but one is present in A. brasiliensis sp. nov. and A. nigrichela . The squama of the antenna is long like that of A. cyanea . The merus of the cheliped is without a spine or process which are present in A. lindae and A. cyanea . The pleonites are without lateral spines as in A cyanea , A. nigrichela and A. brasiliensis sp. nov. Pereopod 4 bears long propodal setae that exceed the distal reach of the unguis. These setae do not reach the distal level of the unguis in A. lindae , A cyanea and A. brasiliensis sp. nov. They are not figured for A. nigrichela . There is no transverse setal row on the propodus of pereopod six as is present in A. cyanea No other species appears to have this setal arrangement.