Atopobathynella nelloreensis, Bandari & Shaik & Ranga Reddy, 2017
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publication ID |
https://doi.org/ 10.1080/00222933.2017.1360528 |
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publication LSID |
lsid:zoobank.org:pub:18BD9A75-5D38-470F-B8C2-D56F645831C4 |
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persistent identifier |
https://treatment.plazi.org/id/03D77950-FFB8-0553-ACA7-D643FC49FAB4 |
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treatment provided by |
Felipe |
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scientific name |
Atopobathynella nelloreensis |
| status |
sp. nov. |
Atopobathynella nelloreensis sp. nov.
( Figures 8 – 13 View Figure 8 View Figure 9 View Figure 10 View Figure 11 View Figure 12 View Figure 13 )
Type locality
Borewell at Krishnapatnam (14º03 ʹ 26 ʹʹ N 79º27 ʹ 33 ʹʹ E) near Nellore town of Andhra Pradesh State, South India ( Figure 1 View Figure 1 (a)) GoogleMaps .
Type material examined
Holotype adult male (ZSI C5856/2/a – m), allotype adult female (ZSI C 5857/2/a – e), dissected on eight and 11 slides, respectively. Paratype adult female (ZSI C 5858/2), mounted whole on a slide. 21 January 2005 and 17 August 2005, Coll . B . Elia.
Diagnosis
Body size up to 0.79 mm, 12 times as long as wide; second antennular segment of male bearing antennal organ represented by a small digitiform process; labrum with 10 main teeth and numerous tiny denticles in the middle; hand-shaped distal tooth of pars molaris pointed; male Th VIII massive, expanded horizontally with somewhat rectangular protopod. Dentate lobe somewhat comb-like. Th VIII female as small crescentic lobe; uropodal sympod with inhomonomous row of six or seven spines, proximal five or six spines uniform in length, ultimate one largest; a seta occurring in the distal third of outer margin, opposite to spine row; anal operculum massive, triangular, reaching the end of caudal furca.
Etymology
The species is named after a town called Nellore, which is close to the type locality; the name is an adjective for place name, made with the Latin suffix ‘-ensis’.
Description
Male (based on holotype). Total body length of holotype 0.76 mm. Body elongated, cylindrical and 12 times as long as wide. Head 45% longer than first two thoracomeres combined and 1.2 times as long as wide.
Antennule ( Figure 9 View Figure 9 (a)) 6-segmented. First segment with one seta on distal inner corner, two simple dorsal setae, two plumose setae, one ventral simple seta at outer distal corner, and one simple seta on outer margin. Second antennular segment with antennal organ ( Figures 8 View Figure 8 (b) and 9(a)) represented by a greatly reduced digitiform process, not extending up to posterior margin of segment, and three plumose setae on outer distal margin. Third segment with a group of three simple setae on outer distal margin, two small, simple setae on distal margin, and one simple seta on inner distal margin. Inner flagellum of third segment long, over-reaching midlength of next segment, partially fused with fourth segment and armed with three simple setae. Fourth segment with one simple seta on dorso-distal margin, one plumose seta beside apophysis. Apophysis short and with two plumose setae. Fifth segment with two simple setae on inner dorsal margin, one long simple seta on outer dorsal margin and three aesthetascs on dorso-distal margin. Sixth segment with six terminal setae and three terminal aesthetascs.
Antenna ( Figure 9 View Figure 9 (c)) small, 1-segmented, twice as long as wide, with two terminal setae (one plumose and one simple) and one subterminal simple seta.
Labrum ( Figure 9 View Figure 9 (d)) free margin with tiny median denticles, flanked on either side by five nearly uniform main teeth. Ventral surface ornamented with one pair of teats and two vertical rows of spinules, as illustrated.
Mandible ( Figure 9 View Figure 9 (e)) distal part of pars incisiva with three unequal, curved and pointed teeth. Tooth on ventral edge small, pointed and lying close to pars molaris. Pars molaris consisting of five spines. Distal claw wide and hand-shaped, with five spinules on outer margin. Palp 1-segmented, with one apical seta, which is seven times as long as palp.
Paragnaths ( Figure 9 View Figure 9 (f)) coupler short, rounded and ornamented with fine spinules distally. Lateral arms rather short, broad, antero-laterally directed and without ornamentation.
Maxillule ( Figure 9 View Figure 9 (g)) with two endites. Proximal endite with two small, claw-like setae distally, one simple lateral seta and one dorsal simple seta at midlength. Distal endite with four terminal and two subterminal claws and three simple setae on outer distal margin.
Maxilla ( Figure 9 View Figure 9 (h)) 4-segmented, basal segment 1.6 times as long as wide and with two setae at inner distal corner. Second segment 0.8 times as long as basal segment and with four setae. Third segment as long as basal segment and with 10 setae. Fourth segment smallest with seven setae. Setal formula 2 – 4-10 – 7. Th I – VII ( Figures 10 View Figure 10 (a – d) and 11(a – c)) well-developed, Th I – IV gradually increasing in size and Th V – VII nearly similar size. Well-developed, club-shaped epipod on Th II – VII, at least 0.7 times as long as basis. Coxa of all Th small, basis with one simple seta, extending beyond midlength of first endopodal segment on Th I, but extending beyond first endopodal segment on Th II – VII. Exopod of Th I 1-segmented, 0.4 times as long as endopod, with one terminal plumose seta and one subterminal seta. Exopod of Th II – VII also 1-segmented, nearly 0.7 times as long as endopod, with one long, terminal plumose seta, one short subterminal seta on outer corner and one subterminal plumose seta on inner margin. Spinule row at base of terminal seta. Endopod 4-segmented. Setal formulae: Th I 1 + 0/1 + 1/1 + 0/2(0), Th II – VII 0 + 0/0 + 1/0 + 1/1(0)
Th VIII ( Figures 12 View Figure 12 (a – b) and 8(c)): parallel to body, rectangular in lateral view, expanded horizontally, twice as wide as long, protopod massive with frontal protrusion. Dentate lobe protruding and with five strong denticles distally. Outer lobe broad and blunt distally in latero-external view. Inner lobe reaching only the base of dentate lobe and much wider than longer. Basexopod balloon-like, not defined at base in lateroexternal view. Endopod in the form of tiny spine located distally.
Pleopod I ( Figure 12 View Figure 12 (c)): present as a plumose seta.
Uropod ( Figures 13 View Figure 13 (b) and 8(d)): sympod 3.4 times as long as wide, with inhomonomous row of seven spines on inner margin; distalmost spine 7% longer than others, a short simple seta occurring on outer margin in the distal third of sympod ( Figure 8 View Figure 8 (d)). Exopod twice as long as endopod, with one terminal and one subterminal seta; outer seta 1.8 times as long as inner seta. Endopod 72% of sympod length, drawn out distally into a spur, with two lateral setae near base of spur.
Pleotelson ( Figures 13 View Figure 13 (a,b) and 8(e)): with one seta at base of caudal furca on either side. Anal operculum ( Figure 13 View Figure 13 (a,b)) large, triangular, prominently protruding and almost reaching end of caudal furca.
Caudal furca ( Figure 13 View Figure 13 (a,b)): as long as maximum width, with three spines and two unequal dorsal setae. Furcal organ small and ventral.
Description
Female (based on allotype). Total body length of allotype 0.79 mm. Body 14 times as long as maximum width ( Figure 8 View Figure 8 (a)). Female differing from male in the details of second antennular segment and thoracopod VIII. Second antennular segment ( Figure 9 View Figure 9 (b)) with a group of three plumose setae on outer distal margin.
Th VIII ( Figure 13 View Figure 13 (c)): small, crescentic lobe.
Variation
Body size varies from 0.60 to 0.73 mm, mean = 0.67 (n = 10) and the number of spines on uropodal sympod varies between 6 and 7.
Ecology
The type locality is about 5 km away from the Bay of Bengal. Sediment of the borewell composed mostly of coarse sand.
The fauna that co-occurred with the new species included the following taxa: Parastenocaris sp. , Elaphoidella sp. , chironomid larvae and nematodes.
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