Pseudosinella hahoteana Soto-Adames, Bernard & Wynne

Bernard, Ernest C., Soto-Adames, Felipe N. & Wynne, J. Judson, 2015, Collembola of Rapa Nui (Easter Island) with descriptions of five endemic cave-restricted species, Zootaxa 3949 (2), pp. 239-267 : 257-259

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Pseudosinella hahoteana Soto-Adames, Bernard & Wynne

n. sp.

Pseudosinella hahoteana Soto-Adames, Bernard & Wynne , n. sp.

Figures 7 View FIGURE 7 C, 12

Material examined. CHILE, Rapa Nui, Maunga Hiva Hiva region, holotype (juvenile), Cave Q 15 -074, direct search in fern-moss garden, sympatric with Lepidocyrtus olena , 13 July 2009, J. Wynne, coll.

Description. Size to 1.1 mm. Body uniformly light blue with darker streaking on Abd. IV ( Fig. 7 View FIGURE 7 C). Scales present on head, body and ventral face of furcula.

Apical bulb of Ant. IV large, unlobed ( Fig. 12 View FIGURE 12 B); subapical sense organ acuminate, as large as guard sensillum; chaetotaxy dominated by thin-walled, apically blunt sensilla instead of normal acuminate, thick walled setae. Sense organ of Ant. III with 2 normal rods and at least 6 additional short, blunt sensilla. Eye patch with 4 eyes ( Fig. 12 View FIGURE 12 A). Dorsal head macrosetae ( Fig. 12 View FIGURE 12 A) with A0, A 2, A 3, Pa 5 present in addition to 6 + 6 in series An. All head microsetae acuminate, weakly ciliate. Prelabral setae weakly ciliate, labral setae smooth. Distal margin of labrum smooth. Outer maxillary lobe with basal and distal setae smooth and subequal; sublobal plate with 4 setae. Lateral appendage of labial papilla E bent anteriorly and not reaching tip of papilla. Proximal labial setae smooth. Labial triangle setae ( Fig. 12 View FIGURE 12 C) as M 1 rE 1 L 1 L 2 A 1-5: A 1 serrate, other elements in series A smooth; r short, smooth and conic, all other posterior setae coarsely ciliate. All postlabial setae ciliate, modified setae absent.

Dorsal macrosetae formula 00/0222+0+ 6. Mesothoracic hood not developed; macrosetae absent; polychaetosis absent. Metathorax chaetotaxy complete (cf. Szeptycki 1979); macrosetae absent. On Abd. I seta a 6 absent, all posterior setae present. Second abdominal segment ( Fig. 12 View FIGURE 12 D) with macrosetae m 3 and m 5 present; supplementary setae associated with bothriotricha m 2 and a 5 smooth or weakly ciliate; all other microsetae smooth; setae a 2 p, m 4 i and p 5 p absent; seta a 3 anterior to and reaching sensillum as. Supplementary setae on Abd. III weakly ciliate ( Fig. 12 View FIGURE 12 E), all other microsetae smooth; seta a 3 anterior and reaching sensillum as; as less than half as long as m 3; sensillum d 2 absent; seta a 7 anterior to im and em, reaching am 6. Fourth abdominal segment ( Fig. 12 View FIGURE 12 F) with 2 inner (B 5, B 6) and 6 lateral macrosetae (T 6, D 2, E 1, E 2, E 3, F 1), E 1 smaller than other macrosetae; 1‒2 additional latero-posterior macrosetae of uncertain homology present; all supplementary setae ciliate or weakly ciliate, setae s and a absent; seta T 3 clearly anterior and not reaching D 1 p; microseta F 2 in row with D 2 and E 2; posterior setae absent.

Trochanteral organ with 6 setae, 5 arranged in 'V' formation and 1 detached. Metatibiotarsi without outstanding posterior setae. Tenent hair acuminate. Unguis ( Fig. 12 View FIGURE 12 G) with 3 inner teeth inserted at 34 %, 46 %, 56 % of inner edge; distal paired tooth minute; lateral and outer teeth ending near basal third of claw. Unguiculus lanceolate on all legs, posterior lamella with 2‒3 small teeth.

On ventral tube distal row of anterior face with 2 macrosetae. Lateral flaps and posterior face not seen. Dens tubercle absent. Mucro ( Fig. 12 View FIGURE 12 H) with apical tooth slightly longer than subapical, basal spine smooth.

Remarks. Pseudosinella hahoteana n. sp. is the only member of the genus with four eyes, apical bulb on Ant. IV and acuminate tenent hair. The new species is most similar to the East Asian P. tridentifera Rusek, 1971 , from which it differs by having an apical bulb on Ant. IV, labial seta r smooth and conic, macroseta m 3 on Abd. II, macroseta B 6 on Abd. IV and inner unpaired ungual tooth inserted distally (42 % in P. tridentifera vs. 56 % in P. hahoteana ). Two other members of the genus, P. canariensis Gama, 1974 and P. fonsa Christiansen & Bellinger, 1992 , have four eyes and only two inner macrosetae on the fourth abdominal segment, but both species carry seta a 2 p on Abd. II and lack the apical bulb on Ant. IV.

Etymology. This animal was named using a combination of two Rapanui terms that when translated to English mean “mouth of the cave.” Hahote is Rapanui for “mouth” and ana means “cave.” Currently, this species is known only from fern-moss gardens within the cave entrance.