Yarrhpelopia Cranston 2017

Cranston, Peter S., Krosch, Matt & Baker, Andrew M., 2021, Molecular evidence for deeper diversity in Australian Tanypodinae (Chironomidae): Yarrhpelopia and related new taxa, Zootaxa 4949 (1), pp. 1-23 : 6

publication ID	https://doi.org/10.11646/zootaxa.4949.1.1
publication LSID	lsid:zoobank.org:pub:8BB4C7DC-B2C2-47BA-AFB6-9216E9559E29
DOI	https://doi.org/10.5281/zenodo.4663269
persistent identifier	https://treatment.plazi.org/id/0E17221B-1107-C646-D8A6-881FFED4FEEB
treatment provided by	Plazi
scientific name	Yarrhpelopia Cranston 2017
status

Treatment

Yarrhpelopia Cranston 2017 View in CoL View at ENA

Generic Diagnoses as for Yarrhpelopia ( Cranston 2017) amended as follows: Adult male.

Antennal ratio 1.7–2.0, plume may be dark or pale; pedicel with 2–4 setae; terminal antennal seta may be short and apical, or as long as the terminal flagellomere and inserted subapically ( Fig. 3A View FIG ). Wing veins with only typical setae (~ 100µ long) or may have a continuous row of 40µ long, near hyaline, blunt-ended setae ( Fig. 3B View FIG ) from base of vein R to apex of R 1. Tergite IX with sparse to many setae ( Fig. 3D View FIG ).

Adult female. Antenna with 11 flagellomeres, terminal setae shorter than to subequal to slightly longer than terminal flagellomere; Antennal ratio 0.22 ( norrisi ) or 0.29–0.31; scape with 4–6 setae, pedicel with 6–9 setae. Range of setal counts and measurable mensural characters as in male, or 15% greater. Gonocoxapodeme VIII gently curved. Gonapophysis VIII triangular, with single rounded microtrichiose lobe. Notum thin, 3x seminal capsule length. Gonotergite IX bare. Tergite IX thin, non-setose. Postgenital plate large bearing small globular cerci. Three ovoid / globular seminal capsules; spermathecal ducts bare, ending separately.

Pupa. Thoracic horn ( Fig. 2A, B View FIG , 3E, F View FIG ) ratios of length / width of horn, and plastron plate to total length of the thoracic horn vary considerably; respiratory atrium may have internal structuring ( Fig. 2B View FIG ); corona surrounding plastron plate broad ( Fig. 2A, B View FIG ) or completely lacking ( Fig. 3E, F View FIG ), horn variably spinose externally ( Figs 2A, B View FIG , 3E, F View FIG ); thoracic comb may comprise several digitiform tubercles ( Fig. 2A View FIG ), fewer short blunt tubercles ( Fig. 3F View FIG ) or, possibly, be absent. Anal lobes tapering ( Fig. 2D, E View FIG ), or squat ( Fig. 3G View FIG ).

Larva. Head shape slightly ( Fig. 2L View FIG ) to more obviously tapering. Antenna varies in lengths and proportions of terminal segments and Lauterborn organ ( Fig. 2M View FIG , 3J View FIG ). Inner teeth of ligula slightly to strongly recessed, directed near anteriorly or slightly curved outward ( Figs 2N View FIG , 3L View FIG ). Submentum with weak to strong transverse striae ( Figs. 2F, G View FIG , 3O View FIG ); arrangements of ventral cephalic setae (S9, S10, SSm) and ventral pit (VP) vary ( Figs. 2F–H View FIG , 3O View FIG ). Mandible varies in strength and intensity of pigment of apical tooth and tooth-like molar extension ( Figs. 2I–J View FIG , 3K View FIG ); some posterior parapods may have hyaline outer margin, with or without ‘flattened hook’ claw(s).

Remarks. Molecular data shows a monophyletic cluster ( Fig. 1 View FIG ) including specimens from the type locality (‘NSWCF, Captains Flat’). Intermingled are variants formerly termed ‘ST1’ (from streams polluted by sewage treatment (‘ST’) or ‘genus D’ ( Cranston 1996), from acidified, polluted or less obviously impacted sites in central Tasmania. Features that suggested their differentiation had included the pupal thoracic horn ( Fig. 2A, B View FIG ), and in the larva include the dimensions of the molar and inner teeth of the mandible ( Fig. 2I–K View FIG ), and the arrangement of setae and pits on the head capsule ( Fig. 2F, G View FIG ). From the relationships inferred in Figure 1 View FIG , we now attribute all these to intra-specific variation including some ‘variation’ caused by poor slide mounts.

The distribution previously reported as covering eastern Australia from 30°S to 42°S, with apparent absence from inland, northern and western Australia, is confirmed after increased nation-wide sampling for our molecular studies. For molecular voucher (MV) material for Y. norrisi Cranston , see Table 1. Additional material expanding original data (‘non-MV’) include as follows: New South Wales: New England, Cathedral Rock N.P., P ♂, Sphagnum swamp drain, 30°26’42”S 152°16”E 13.iii.2017; P ♀, same, except Sphagnum bog pool, 30°26’18”S 152°17’9”E; Pe, Northangera, Warrambucca Ck., 34°34’S 142°55’E, 4.i.2017; Tasmania, L, Quarry pool, 41°11’36”S 148°0’25’’E, 22.ii.2017.