Xenobates riedli, Zettel & Laciny & Bongo, 2021
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publication ID |
https://doi.org/ 10.37520/aemnp.2021.012 |
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publication LSID |
lsid:zoobank.org:pub:71F65F83-C39D-470A-9483-107C527E4FD9 |
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persistent identifier |
https://treatment.plazi.org/id/039CFA2B-FFC5-FFA1-FEB4-FCF2299AFBD4 |
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treatment provided by |
Carolina |
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scientific name |
Xenobates riedli |
| status |
sp. nov. |
Xenobates riedli sp. nov.
( Figs 3, 4 View Figs 1–4 , 10, 14, 19, 20, 22, 24, 26 View Figs 9–26. 9–12 )
Type locality. Philippines, Camotes Islands, Pacijan Island, San Francisco, mangrove along road to Poro (near bridge), ca. N 10°39′, E 124°23′. Type material. Hඈඅඈඍඒඉൾ: J ( PNM): PHILIPPINES: Cൺආඈඍൾඌ Iඌඅൺඇൽඌ: Pacijan Island, San Francisco, mangrove at road to Poro, leg. H. Zettel. Pൺඋൺඍඒඉൾඌ (18 JJ 27 ♀♀; PNM, NHMW, UPLB, USC) from the following localities: PHILIPPINES: Cൺආඈඍൾඌ Iඌඅൺඇൽඌ: 11 JJ 15 ♀♀, collected with the holotype [#1]; 3 ♀♀, Pacijan Island, south coast at Unidos, leg. H. Zettel [#2]. Bඎඋංൺඌ Iඌඅൺඇൽ: 2♀♀, San Pasqual, Mabuhay, Taberna, leg. H. Zettel [#3]; 2 ♀♀, San Pasqual, Mabini, leg. H. Zettel [#4]; 7 JJ 5 ♀♀, San Pasqual, near town, leg. H. Zettel [#5].
Diagnosis. Small species (BL JJ 1.40–1.48 mm, ♀♀ 1.68–1.75 mm). Dorsum black with distinct yellowish marks on head and pronotum ( Figs 3, 4 View Figs 1–4 ). Antennomere 2 with two, 3 and 4 without long setae ( Fig. 10 View Figs 9–26. 9–12 ). Mesofemur ( Fig. 14 View Figs 9–26. 9–12 ) and mesotibia with rows of long setae. Long setae on profemur and protibia scarce and less distinct. MfHI high (JJ 1.14–1.27, ♀♀ 1.23–1.75); MLI high (JJ 1.85–1.98, ♀♀ 1.72–1.82); MsTaI medium (JJ ♀♀ 0.61–0.66). Metafemur incrassate. – Male: Abdominal venter with swelling ( Fig. 24 View Figs 9–26. 9–12 ) that lacks steep declivity on sternite 6. Paramere moderately long ( Fig. 22 View Figs 9–26. 9–12 ). – Female: Abdomen strongly narrowed posteriorly ( Fig. 26 View Figs 9–26. 9–12 ).
Description. Male. Measurements (mm; n = 5; #1): BL 1.46 (1.40–1.48); BW 0.75 (0.73–0.75); AL 1.17 (1.13– 1.20); MsfL 1.18 (1.15–1.20); MfHL 0.12 (0.11–0.14); MtiL 0.96 (0.95–0.98); MtaL 0.62 (0.60–0.63); MsfW 0.10 (0.10–0.11); MtfW 0.11 (0.11–0.12). – Indices: AI 0.80 (0.76–0.84); MLI 1.89 (1.85–1.98); MfHI 1.23 (1.14– 1.27); MsTaI 0.65 (0.63–0.66); MtsfWI 1.08 (1.07–1.13). Colour ( Fig. 3 View Figs 1–4 ). Ground colour black. Head dorsally with four longitudinal yellow marks; two medial broad and confluent at base, two lateral ones at eye margin narrow and in some specimens connected with medial ones at base. Pronotum with pair of transverse yellow stripes at hind margin. Underside of head and acetabula yellow. Posterior sternites orange to yellow. Antenna blackish brown, except for pale yellow base (ca. one fourth to one third). On legs coxae and trochanters yellow, except for brown apex of mesotrochanter. Femora, tibiae, and tarsi dark brown, except for base of profemur that is to a varying extent yellow.
Pilosity. Dorsum of body with inconspicuous grey to brown hair layer. Thoracic pleura and connexival margins with short, oblique dark setae. Meso-metanotum with four roundish patches of silvery pilosity, one pair near middle and one pair anterolaterally. Tergites 2, 3, and 7 entirely covered by silvery pilosity, tergites 4–6 with narrow medial patches (in some specimens indistinct). Lower parts of thoracic pleura with uninterrupted stripe of silvery pilosity. Venter with short, white, almost uniform pilosity. Antennomeres 2 with two standing setae, 3 and 4 without such setae ( Fig. 10 View Figs 9–26. 9–12 ). Profemur on flexor side and protibia on extensor side with few long setae. Mesofemur on extensor side with one row of very long oblique setae (longer than mesofemur width).
Structure. Body moderately slender, fusiform. Head anteriorly moderately pointed. Eyes moderately large; interocular width slightly more than half of head width. Antenna long. Pronotum very short. Legs slender. Metafemur thickened, in basal third wider than mesofemur. Abdomen convergent posteriorly; connexival margins distinctly convex. Tergites moderately wide, tergite 7 about 1.6 times as wide as long. Sternites 2–6 with roundish swelling, from sternites 5 to 7 evenly sloping, in lateral view without steep declivity on sternite 6 ( Fig. 24 View Figs 9–26. 9–12 ). Sternite 7 transversely convex. A median carina of segment 8 at most weakly indicated. Genitalia small. Paramere ( Fig. 22 View Figs 9–26. 9–12 ) moderately long and very slender, distally weakly curved, without setae.
Female. Measurements (mm; n = 7; #1, 3): BL 1.70 (1.68–1.75); BW 0.91 (0.88–0.95); AL 1.15 (1.10–1.18); MsfL 1.29 (1.25–1.33); MfHL 0.14 (0.11–0.15); MpHL 0.12 (0.11–0.13); MPnL 0.10 (0.09–0.11); MtiL 1.07 (1.05– 1.10); MtaL 0.68 (0.65–0.70); MsfW 0.09 (one value); MtfW 0.11 (0.10–0.11). – Indices: AI 0.68 (0.63–0.71); MLI 1.78 (1.72–1.82); MfHI 1.52 (1.23–1.75); MsTaI 0.63 (0.61–0.65); MtsfWI 1.18 (1.15–1.25); MpHI 1.23 (1.00–1.38).
Colour ( Fig. 4 View Figs 1–4 ). Similar as in male.
Pilosity. Similar as in male. Oblique setae on thorax sides much longer and more conspicuous. Hind margin of meso-metanotum medially with a few moderately long setae. Connexival margins only anteriorly with a few oblique setae. Laterotergites 6 and 7 with few oblique black setae directed posteromedially. Posterior half of tergite 8 with dense brush of posteriorly directed setae. Sternites 2–7 with even, extremely short whitish pilosity, 7, in addition, with fringe of whitish setae at hind margin. Pilosity of antennae and legs similar as in male; longest setae on mesofemur on average about 1.5 times as long as mesofemur width.
Structure. Body clearly larger (BLI: 1.16) than in male. Thorax more strongly widened posteriorly. Legs similar as in male, except for slenderer meso- and metafemur (therefore, MsHI higher).Abdomen in dorsal view subtriangular ( Fig. 26 View Figs 9–26. 9–12 ), connexival margins anteriorly strongly, posteri- orly moderately converging. Laterotergites steeply raised, 6 and 7 vertical. All tergites much wider than long, 1–6 flat, 8 slightly convex and directed posterodorsally. Tergite 7 about 1.7 times as wide as long, horizontal. Tergite 8 about 1.5 times as wide as long, directed dorsolaterally. Proctiger semicircular in posterodorsal aspect. Apex of sternite 7 in lateral view downcurved. Gonocoxa 1 hardly visible in caudal view.
Comparative notes. Xenobates riedli sp. nov. is closely related with X. singaporensis . Both species share, e.g., similar mesofemoral row of setae, medially interrupted pale pronotal marking, medial swelling on anterior sterna of males, and posteriorly strongly narrowed abdomen of females. However, males of X. riedli sp. nov. differ in much shorter parameres and less pronounced swelling on the abdominal venter, which evenly slopes down on sternites 5–7 ( Fig. 24 View Figs 9–26. 9–12 ). The same structure is higher and forms a step between sternites 6 and 7 in X. singaporensis . Females of X. riedli sp. nov. can be distinguished from females of X. singaporensis by less convergent connexival margins and tergite 7 being much wider than long ( Fig. 26 View Figs 9–26. 9–12 ).
Etymology. The first author dedicates this species to the memory of his university teacher Prof. Dr. Rupert Riedl, the famous Austrian marine biologist, evolutionary biologist, conservationist, and member of the Club of Rome, who passed away on September 19, 2005.
Habitats. This species has been collected in extensive mangrove stands and seems relatively rare.
Distribution. So far only known from two small islands in the Central Philippines, Pacijan and Burias.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.