Habrobathynella indica, Reddy & Schminke, 2005
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publication ID |
https://doi.org/ 10.1080/00222930400007464 |
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persistent identifier |
https://treatment.plazi.org/id/03ED8133-FF8B-FFCB-46AF-FF4941B5FE85 |
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treatment provided by |
Felipe |
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scientific name |
Habrobathynella indica |
| status |
sp. nov. |
Habrobathynella indica sp. n.
( Figures 1–3 View Figure 1 View Figure 2 View Figure 3 )
Type locality and material examined
River Krishna at Vijayawada city (16 ° 31 9 N, 80 ° 39 9 E), south India; close to the southern end of Kanaka Durga Varadhi , a road-bridge. Four males and five females from fine sand, about 50 m from the water’s edge at a depth of 25–40 cm, 31 August 1998. Water temperature 30 ° C. Holotype (female), allotype (male), paratypes (one male, one female), all undissected were deposited in the Natural History Museum, London. Registration numbers: holotype 2000.1433, allotype 2000.1434, paratypes 2000.1435–1436. Dissected paratypes are kept in the Department of Zoology, Nagarjuna University. The description of the type locality, the methods used for collecting the material, and the co-occurring meiofauna are as given in Ranga Reddy (2001) GoogleMaps .
Description
Adult female. Total length of holotype 0.82 mm (abdominal segments telescoped into one another); paratypes 0.99–1.04 mm. Body elongate and 13 times longer than maximum width. Abdominal segments wider than thoracic ones. Head 27.5% longer than wide and slightly longer than first three thoracic segments combined.
Anal operculum deeply concave medially ( Figure 1a View Figure 1 ).
Pleotelson ( Figure 1a View Figure 1 ) with one seta on either side at base of furcal ramus; seta bare, as long as caudal ramus.
Caudal furca ( Figure 1a, b View Figure 1 ) 25% longer than maximum width, distal part expanded and rounded, with two terminal and two inner, pointed, serrulate spines and two unequal dorsolateral setae. Furcal organ small, ventral.
Antennule ( Figure 1f View Figure 1 ) consisting of six short, thick segments, 37.5% longer than head; first segment thickest, the remainder becoming progressively thinner. Length of first three segments distinctly greater than that of last three; apophysis of segment 4 slender, nearly as long as the next segment. No sexual dimorphism. Segments 5 and 6 with three aesthetascs each. Setation as observed under light microscopy (see Figure 1f View Figure 1 ).
Antenna ( Figure 1g View Figure 1 ) small, with two segments; proximal segment smaller than distal one and unarmed; distal segment almost twice as long as wide, with a total of four setae: two unequal terminal ones of which one is plumose, one subterminal and one outer proximal.
Labrum ( Figure 1d, e View Figure 1 ) with eight main, nearly uniform apical teeth and two smaller marginal ones on each side.
Mandible ( Figure 1h–j View Figure 1 ): distal part of pars incisiva with four somewhat unequal teeth, distalmost two largest. Proximal tooth of pars incisiva large. Pars molaris (Borstenlobus) developed into somewhat pyriform structure, carrying two isolated, lateral teeth and three small, pointed teeth occurring in a group at distal end, as illustrated; all teeth articulate; no setae discernible. Palp absent.
Maxillule ( Figure 1k View Figure 1 ) with two endites. Proximal endite small, with four claw-like spines of different sizes. Distal endite elongate, 2.6 times as long as proximal endite and with four terminal claws, distal one large, and with two unequal spines and one denticle on inner margin, three subterminal setae on distal outer margin.
Maxilla ( Figure 1l View Figure 1 ) three-segmented; basal segment twice as long as wide and with three unequal setae on small protuberance at distal inner corner; second segment 1.3 times as long as proximal segment and armed with 14 setae and one reduced claw-like spine at distal inner corner; third segment small, almost squarish, fused with large terminal claw.
Thoracopods I–VII ( Figure 2a–g View Figure 2 ): thoracopods I short and without epipodite; thoracopods II–VII of nearly similar size, with two-segmented club-shaped epipodite, two-thirds as long as basipodite. In all thoracopods, coxa with distinct conical projection at distal inner border and basis with one weak seta at distal inner corner. Exopodite twosegmented; first segment with one dorsal and one ventral seta; second segment with two terminal, unequal divergent setae, dorsal one short and plumose, ventral one long and spiculated. Endopodite four-segmented, fourth segment very small. Setal formulae: Th. I 1+0/0+1/0+1/2(0); Th. II–VII: 0+0/0+1/0+1/1(0).
Thoracopod VIII ( Figure 1c View Figure 1 ) small, crescentic, papillate structure.
Pleopod 1 absent.
Uropod ( Figure 1a, b View Figure 1 ): sympodite four times longer than wide, bearing four spines in a row on inner distal margin; distal spine straight (slightly curved in dorsal view), distinctly stouter and 43% longer than others; proximal spine slightly longer than other two; lateral margins of all spines serrulate. Endopodite sickle-shaped (doubly curved in dorsal view; Figure 1a View Figure 1 ), reaching 66% of sympodite length; distal inner margin serrate; two unequal plumose setae at proximal third of outer margin. Exopodite cylindrical, four times longer than wide, measuring 30% of sympodite length and carrying two apical, unequal, plumose setae, outer seta twice as long as inner one.
Adult male. Total length of allotype 0.99 mm (telescoping of abdominal segments minimal), and of paratypes 0.74–0.82 mm. Body and all appendages except thoracopod VIII as in female.
Thoracopod VIII ( Figure 3a, b View Figure 3 ): large and grotesque in appearance. Protopodite much expanded laterally and nearly spherical in outline. Outer lobe (lobus externus) not discernible. Dentate lobe (lobus denticulatus) small, with a row of fine denticles along free margin and two rows of similar denticles on its surface; no accessory lobe present. Inner lobe (lobus internus) enormously developed into an elongate penis-like organ, extending forward up to thoracopod VII ( Figure 2h View Figure 2 ); a duct running throughout the length of the penial organ. Basipodite small and carrying a seta. Exopodite with a large tooth beneath which are three rows of denticles. Endopodite represented by a smooth seta.
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