Texanobathynella aaronswinki Camacho & Mas-Peinado & Hutchins & Schwartz & Dorda & Casado & Rey 2021, sp. nov

Autor: Camacho, A. I., Mas-Peinado, P., Hutchins, B. T., Schwartz, B. F., Dorda, B. A., Casado, A., Rey, I.
Rok vydání: 2021
Předmět:
ISSN: 0022-2933
DOI: 10.5281/zenodo.5496912
Popis: Texanobathynella aaronswinki sp. nov. Camacho and Hutchins, 2020 http://zoobank.org/ urn:lsid:zoobank.org:act: 74A8B360-D749-4576-9987-AC02460B82E7 Material examined (Table 1) Type locality. Sessom Creek, Hays County, Texas, USA (WGS 84 29.88996ºN, − 97.93596ºE, 177 m amsl): holotype male (MNCN 20.04 /20165 slide and MNCN / ADN 54863 DNA extract) and (two male and one female paratypes. Coll. by B. Hutchins and B. Schwartz, 21 July 2015 (sample 150.721-H1). Other localities: South Llano River, Kimble County, Texas, USA (WGS84 30.45342, −99.80060, 520 m amsl): two females, one each from samples 160.415-H2 and 160.415- H3. Same collectors, 15 April 2016. All four specimens examined (three females and one male) (Table 1) belong to the type series: four slides (morphological type series MNCN 20.04 /20165 to MNCN 20.04 /20168), together with four DNA extractions from the specimens used for molecular analysis (DNA types MNCN / ADN 54862, MNCN / ADN 54863, MNCN / ADN 54865 and MNCN / ADN 54866) (see Table 1). Description. Body elongated, segments widening towards posterior end. Head longer than broad. Antennule (Figure 4 (a)) 7-segmented; first three segments much longer than last four segments combined; first segment longest; third segment similar in length to last segment, but triple in width; fifth segment shortest, with four smooth setae; inner flagellum trapezoidal; setation as in Figure 4 (a); segments five with two aesthetascs and segments 6 and 7 with three terminal aesthetascs. Antenna (Figure 4 (b)) 3-segmented, segments similar in length; first two segments without setae, third segment slightly longer than other two, with four setae, of which three terminal, one plumose and the other smooth. Labrum (Figure 4 (c)). Almost flat, with 10 main teeth, of which all bicuspidate except two central, and lateral-most at each side that are multicuspidate. Mandible (Figure 4 (d)). Pars incisiva with four well-developed teeth and very thin proximal tooth as in Figure 4 (d); pars molaris with seven uneven claws, two most proximal setulose, and joined basally; mandibular palp not exceeding pars incisiva. Maxillule (Figure 4 (f)). Proximal endite with four unequal claws; distal endite with five claws, of which two apical smooth, the rest denticulate; three simple unequal setae placed subdistally on outer margin of endite, as figured. Maxilla (Figure 4 (g)) 3-segmented; setal formula: 1, 2 + 1, 13. Thoracopods I–VII (Figure 5 (a–g)). Well developed, increasing gradually in length from ThI to ThIII (Figure 5 (a–c)); ThIV (Figure 5 (d)) to VII (Figure 5 (g)) similar in length; ThI without epipod; epipod well developed on ThII to VII, reaching a little more than half length of basipod. Basipod of all Ths with one short, smooth terminal seta. Exopod 2-segmented (ThI, VI, VII; Figure 5 (a,f,g)), 3-segmented (ThII–ThV; Figure 5 (b–e)); exopod of ThI–III, VI and VII shorter than corresponding endopod, rami similar in length in ThIV–V; all exopodal segments with one barbed seta (with groups of ctenidia at base) and one short and smooth outer seta, except last segment, which has a long barbed seta and a shorter plumose seta. Endopod of all thoracopods 4-segmented, first segment small, second and third long and similar in length, both with cluster of strong spinules along outer margin; fourth segment reduced with two strong smooth claws and one simple seta; outer seta of second segments of Th I–VII plumose. Setal formula of endopod as follows: ThI 1 + 1/1 + 1/1 + 0/3(1) ThII–VII 0 + 0/0 + 1/0 + 0/3(1) Male thoracopod VIII (Figure 4 (h,i)). Rectangular, 1.5 times as long as wide, comprising basipod with both exopod and endopod inserted on posterior side of segment. Proximal region of basipod prolonged anteriorly onto penial complex, with three lobes: subrectangular outer lobe fused with basipod, placed adjacent to exopod in internal view; small dentate lobe covered with small terminal ‘tubercles’ and rounded inner lobe with a small bulge on distal end. Basipod not very short, with seta implanted close to insertion of endopod; latter small and with two setae; exopod, only visible on the back side of basipod, reduced to a small conical process. Female thoracopod VIII (Figure 5 (j)). Trapezoidal, unsegmented, with three small teeth on distal end. Pleotelson. Without ventral seta. Anal operculum not pronounced, almost flat. First pleopods. Absent. Uropod (Figure 5 (h)). Sympod 3.5 times as long as wide and 2.5 times longer than rami, with six unequal barbed spines, distal spines twice longer than rest. Rami equal in length; endopod terminating in lancet-shaped spine, with two barbed and one plumose setae at base; exopod with three barbed setae. Furca (Figure 5 (i)). Rami almost triangular, each with six barbed spines, terminal two longer than rest; two unequal plumose setae implanted dorsally on each ramus, more internal seta reduced. Etymology. The species is named after Aaron Swink, junior researcher, who played a major role in the sampling of hyporheic sites in Texas and educated youth about groundwater ecology for 5 years as Assistant Director for the Edwards Aquifer Research and Data Center’s education programme. The epitheton is a noun in the genitive singular masculine.
Published as part of Camacho, A. I., Mas-Peinado, P., Hutchins, B. T., Schwartz, B. F., Dorda, B. A., Casado, A. & Rey, I., 2021, New stygofauna from Texas, USA: three new species of Parabathynellidae (Crustacea: Bathynellacea), pp. 979-1007 in Journal of Natural History 55 (15 - 16) on pages 993-997, DOI: 10.1080/00222933.2021.1928316, http://zenodo.org/record/5465002
{"references":["Hutchins BT, Swink AP, Diaz PH, Schwartz BF. 2020. Environmental influences on invertebrate diversity and community composition in the hyporheic zone ecotone in Texas, USA: contrasts between co-occurring epigean taxa and stygobionts. Hydrobiologia. 847 (19): 3967 - 3982. doi: 10.1007 / s 10750 - 020 - 04379 - 8"]}
Databáze: OpenAIRE
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